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Annette Trunschke - One of the best experts on this subject based on the ideXlab platform.
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surface roughness effects in the catalytic behavior of vanadia supported on sba 15
Journal of Catalysis, 2014Co-Authors: Michael A Smith, Neil G Hamilton, Alexander Zoelle, Yong Yang, Robert M Rioux, Kazuhiko Amakawa, Pia Kjaer Nielsen, Annette TrunschkeAbstract:Abstract SBA-15 is a template-synthesized mesoporous silica that has found extensive use as a model support for catalytic studies. Thorough structural analyses describe a dual micropore–mesopore structure with a broad distribution of micropore size that we alternatively describe as fractal surface roughness. SBA-15 materials with varying surface roughness were systematically prepared followed by grafting with sub-monolayer coverage of vanadium oxide (VOx). VOx-SBA-15 samples were characterized using nitrogen adsorption, UV–vis spectroscopy, and Raman spectroscopy and tested in the catalytic partial oxidation of methanol to formaldehyde as well as propane to propene. SBA-15 supports with smoother surfaces favor the formation of more polymeric vanadia species at the same surface density loading. Smooth surface catalysts result in a ∼20% lower selectivity of methanol to formaldehyde, and the apparent activation energy on smooth surfaces is ∼25 kJ/mol lower than on rough surfaces (75 versus 100 kJ/mol, respectively). In contrast to methanol, propane results show a 15% higher selectivity to propene on smooth surfaces. A model of silica hydroxyl distribution is proposed to explain the differences in vanadia speciation and resulting catalytic behavior. These results are significant for our understanding of the nature of vanadium species in partial oxidation catalysts and illustrate the importance of considering differences in support surface morphology in analyzing catalytic behavior.
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the reaction network in propane oxidation over phase pure movtenb m1 oxide catalysts
Journal of Catalysis, 2014Co-Authors: Raoul Naumann Dalnoncourt, Robert Schlogl, Lenardistvan Csepei, Michael Havecker, Frank Girgsdies, Manfred Erwin Schuster, Annette TrunschkeAbstract:Abstract MoVTeNb oxide catalysts exclusively composed of the M1 phase (ICSD No. 55097) have been studied in the direct oxidation of propane to acrylic acid applying a broad range of reaction conditions with respect to temperature (623–633–643–653–663 K), O 2 concentration in the feed (4.5–6.0–9.0–12.0%), steam concentration in the feed (0–10–20–40%), and contact time (0.06–0.12–0.18–0.24–0.36–0.48–0.72–1.44 s g cat Nml −1 ). The molar fraction of propane was kept at 3.0%. Model experiments were performed to study the reactivity of possible intermediates propene, acrolein, and CO. The impact of auxiliary steam on the chemical nature of the catalyst surface was analyzed by in situ photoelectron spectroscopy, while in situ X-ray diffraction has been carried out to explore the structural stability of the M1 phase under stoichiometric, oxidizing, and reducing reaction conditions. Phase purity apparently accomplishes absolute stability in terms of the crystalline bulk structure and the catalytic performance over month even under extreme reaction conditions. In contrast, the catalyst surface changes dynamically and reversibly when the feed composition is varied, but only in the outermost surface layer in a depth of around one nanometer. The addition of steam causes enrichment in V and Te on the surface at the expense of Mo. Surface vanadium becomes more oxidized in presence of steam. These changes correlate with the abundance of acrylic acid detected in the in situ photoelectron spectroscopy experiment. Analysis of the three-dimensional experimental parameter field measured in fixed bed reactors revealed that the complexity of the reaction network in propane oxidation over MoVTeNb oxide is reduced compared to less-defined catalysts due to phase purity and homogeneity. The oxidative dehydrogenation of propane to propene followed by allylic oxidation of propene comprises the main route to acrylic acid. The oxygen partial pressure was identified as an important process parameter that controls the activity in propane oxidation over phase-pure M1 without negative implications on the selectivity. High O 2 concentration in the feed keeps the catalyst in a high oxidation state, which provides an increased number of active sites for propane activation. Auxiliary steam increases activity and selectivity of M1 by changing the chemical nature of the active sites and by facilitating acrylic acid desorption.
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high performance vox n tiox m sba 15 catalysts for the oxidative dehydrogenation of propane
Catalysis Science & Technology, 2014Co-Authors: Carlos A Carrero, Arne Dinse, Robert Schlogl, Annette Trunschke, Markus Kauer, Till Wolfram, Neil G Hamilton, Reinhard SchomackerAbstract:Grafted VxOy catalysts for oxidative dehydrogenation of propane (ODP) have been studied due to their potential high performance and as model catalysts in the past. We report on a positive synergetic effect capable of considerably enhancing the propene productivities above reported performances. The most productive catalysts were found at metal loadings (V + Ti) close to the monolayer coverage. The 4V/13Ti/SBA-15 catalyst presented a considerably high productivity (6–9 kgpropene kgcat−1 h−1). Moreover, with this catalyst, propene productivity only slightly decreased as a function of propane conversion, indicating that propene combustion toward COx occurs more slowly in comparison to other catalysts exhibiting high propene productivities. A detailed kinetic analysis of the 4V/13Ti/SBA-15 catalyst revealed that high vanadia and titania dispersions are required for high propene productivity.
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surface chemistry of phase pure m1 movtenb oxide during operation in selective oxidation of propane to acrylic acid
Journal of Catalysis, 2012Co-Authors: Michael Havecker, Sabine Wrabetz, Robert Schlogl, Raoul Naumann Dalnoncourt, Lenardistvan Csepei, Frank Girgsdies, Jutta Krohnert, Yuri V Kolenko, Annette TrunschkeAbstract:The surface of a highly crystalline MoVTeNb oxide catalyst for selective oxidation of propane to acrylic acid composed of the M1 phase has been studied by infrared spectroscopy, microcalorimetry, and in-situ photoelectron spectroscopy. The acid-base properties of the catalyst have been probed by NH3 adsorption showing mainly Bronsted acidity that is weak with respect to concentration and strength of sites. Adsorption of propane on the activated catalyst reveals the presence of a high number of energetically homogeneous propane adsorption sites, which is evi- denced by constant differential heat of propane adsorption qdiff,initial=57 kJ mol -1 until the monolayer coverage is reached that corresponds to a
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role of dispersion of vanadia on sba 15 in the oxidative dehydrogenation of propane
Catalysis Today, 2010Co-Authors: Philipp Gruene, Robert Schlogl, Till Wolfram, Katrin Pelzer, Annette TrunschkeAbstract:A series of vanadia catalysts supported on the mesoporous silica SBA-15 are synthesized using an automated laboratory reactor. The catalysts contain from 0.6 up to 13.6V atoms/nm 2 and are structurally characterized by various techniques (BET, XRD, SEM, TEM, Raman, IR, UV/Vis). tetrahedral (VOx)n, also substantial amounts of three-dimensional, bulk-like V2O5 are present in the catalyst. The structural similarity of the low- loaded catalysts is reflected in their alike catalytical activity during the oxidative dehydrogenation (ODH) of propane between 380 and 480 °C. Propene, CO, and CO2 are formed as reaction products, while neither the formation of ethene nor acrolein or acrylic acid is observed in other than trace amounts. The activation energy for ODH of propane is 140 kJ/mol. The catalyst with the highest loading yields varying activation ener- gies for different reaction conditions, which is probably related to rearrangements between bulk-like and dispersed, two-dimensional (VOx)n. Rather than the monomer to oligomer ratio, the ratio of two-dimensional to three-dimensional vanadia seems to be crucial for the catalytic prop- erties of silica supported vanadia in the ODH of propane.
Alexis T Bell - One of the best experts on this subject based on the ideXlab platform.
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selective oxidation and oxidative dehydrogenation of hydrocarbons on bismuth vanadium molybdenum oxide
Journal of Catalysis, 2015Co-Authors: Zheng Zhai, Xuan Wang, Rachel B Licht, Alexis T BellAbstract:Abstract A systematic investigation of the oxidative dehydrogenation of propane to propene and 1- and 2-butene to 1,3-butadiene, and the selective oxidation of isobutene to methacrolein was carried out over Bi1−x/3V1−xMoxO4 (x = 0–1) with the aim of defining the effects of catalyst and reactant composition on the reaction kinetics. This work has revealed that the reaction kinetics can differ significantly depending on the state of catalyst oxidation, which in turn depends on the catalyst composition and the reaction conditions. Under conditions where the catalyst is fully oxidized, the kinetics for the oxidation of propene to acrolein and isobutene to methacrolein, and the oxidative dehydrogenation of propane to propene, 1-butene and trans-2-butene to butadiene are very similar—first order in the partial pressure of the alkane or alkene and zero order in the partial pressure of oxygen. These observations, together with XANES and UV–Vis data, suggest that all these reactions proceed via a Mars van Krevelen mechanism involving oxygen atoms in the catalysts and that the rate-limiting step involves cleavage of the weakest C H bond in the reactant. Consistent with these findings, the apparent activation energy and pre-exponential factor for both oxidative dehydrogenation and selective oxidation correlate with the dissociation energy of the weakest C H bond in the reactant. As the reaction temperature is lowered, catalyst reoxidation can become rate-limiting, the transition to this regime depending on ease of catalyst reduction and effectiveness of the reacting hydrocarbons as a reducing agent. A third regime is observed for isobutene oxidation at lower temperatures, in which the catalyst is more severely reduced and oxidation now proceeds via reaction of molecular oxygen, rather than catalyst lattice oxygen, with the reactant.
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oxidative dehydrogenation of propane over vanadia based catalysts supported on high surface area mesoporous mgal2o4
Journal of Catalysis, 2004Co-Authors: Owen R Evans, Alexis T Bell, Don T TilleyAbstract:Abstract The oxidative dehydrogenation of propane to propene was investigated over a series of novel vanadia-based catalysts supported on high-surface-area magnesium spinel. A mesoporous MgAl 2 O 4 support was synthesized via a low-temperature sol–gel process involving the heterobimetallic alkoxide precursor, Mg[Al(O i Pr) 4 ] 2 . A high-purity catalyst support was obtained after calcination at 1173 K under O 2 atmosphere and active vanadia catalysts were prepared from the thermolysis of OV(O t Bu) 3 after grafting onto the spinel support. MgAl 2 O 4 -supported catalysts prepared in this manner have BET surface areas of 234–245 m 2 /g. All of the catalysts were characterized by X-ray powder diffraction, and Raman, solid-state NMR, and diffuse-reflectance UV–vis spectroscopy. At all vanadium loadings the vanadia supported on MgAl 2 O 4 exist as a combination of isolated monovanadate and tetrahedral polyvanadate species. As the vanadium surface density increases for these catalysts the ratio of polyvanadate species to isolated monovandate species increases. In addition, as the vanadium surface density increases for these catalysts, the initial rate of propane ODH per V atom increases and reaches a maximum value at 6 VO x /nm 2 . Increasing the vanadium surface density past this point results in a decrease in the rate of propane ODH owing to the formation of multilayer species in which subsurface vanadium atoms are essentially rendered catalytically inactive. The initial propene selectivity increases with increasing vanadium surface density and reaches a plateau of ∼95% for the V/MgAl catalysts. Rate coefficients for propane ODH ( k 1 ), propane combustion ( k 2 ), and propene combustion ( k 3 ) were calculated for these catalysts. The value of k 1 increases with increasing VO x surface density, reaching a maximum at about 5.5 VO x /nm 2 . On the other hand, the ratio ( k 2 / k 1 ) for V/MgAl decreases with increasing VO x surface density. The ratio ( k 3 / k 1 ) for both sets of catalysts shows no dependence on the vanadia surface density. The observed trends in k 1 , ( k 2 / k 1 ), and ( k 3 / k 1 ) are discussed in terms of the surface structure of the catalyst.
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oxidative dehydrogenation of propane over vanadia magnesia catalysts prepared by thermolysis of ov otbu 3 in the presence of nanocrystalline mgo
Journal of Catalysis, 2002Co-Authors: Alexis T Bell, Don T TilleyAbstract:Abstract The influence of vanadium content on the performance of V–Mg–O catalysts for the oxidative dehydrogenation (ODH) of propane was investigated. High-surface-area (380 m 2 /g) MgO was prepared by hydrolysis of Mg(OCH 3 ) 2 followed by hypercritical drying. Vanadia was deposited on this support by thermolysis of OV(O t Bu) 3 . Catalysts prepared by this means have BET surface areas of 187–299 m 2 /g and apparent surface densities of V 2 O 5 of 1.1–10.3 VO x /nm 2 . All of the catalysts were characterized by X-ray diffraction, temperature-programmed reduction, and Raman, UV–visible, and nuclear magnetic resonance spectroscopy. The environment of the V atoms depends strongly on the apparent surface density of vanadia. Isolated VO 4 2− units are present at very low apparent surface densities (∼1 VO x /nm 2 ). As the vanadia density increases, magnesium vanadate structures are formed and above a surface density of 3.5 VO x /nm 2 well-dispersed magnesium orthovanadate domains become evident. The rate of ODH per V atom increases with increasing VO x surface density and reaches a maximum value at 3.5 VO x /nm 2 . Above this surface density, the rate of ODH per V atom decreases because an increasing fraction of the V atoms lie below the catalyst surface and, hence, are inaccessible. Consistent with this interpretation, the ODH activity per unit surface area reaches a plateau at a VO x surface density of about 4 VO x /nm 2 . The propane ODH selectivity of the catalysts increases with increasing VO x surface density and reaches a plateau of 80% for an apparent surface density of about 4 VO x /nm 2 . Rate coefficients for propane ODH ( k 1 ), propane combustion ( k 2 ), and propene combustion ( k 3 ) were calculated for each catalyst. The value of k 1 increases with increasing VO x surface density, reaching a maximum at about 4 VO x /nm 2 . By contrast, the ratios ( k 2 / k 1 ) and ( k 3 / k 1 ) decrease monotonically with increasing VO x surface density. The observed trends in k 1 , ( k 2 / k 1 ), and ( k 3 / k 1 ) are discussed in terms of the surface structure of the catalyst.
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kinetic isotopic effects in oxidative dehydrogenation of propane on vanadium oxide catalysts
Journal of Catalysis, 2000Co-Authors: Enrique Iglesia, Alexis T Bell, Kaidong ChenAbstract:Abstract Kinetic isotopic effects (KIEs) for oxidative dehydrogenation of propane were measured on 10 wt% V 2 O 5 /ZrO 2 . Normal KIEs were obtained using CH 3 CH 2 CH 3 and CD 3 CD 2 CD 3 as reactants for primary dehydrogenation (2.8) and combustion (1.9) of propane and for secondary combustion of propene (2.6), suggesting that in all cases C–H bond dissociation is a kinetically relevant step. CH 3 CH 2 CH 3 and CH 3 CD 2 CH 3 reactants led to normal KIEs for dehydrogenation (2.7) and combustion (1.8) of propane, but to a very small KIE (1.1) for propene combustion. These results show that the methylene C–H bond is activated in the rate-determining steps for propane dehydrogenation and combustion reactions. The rate-determining step in secondary propene combustion involves the allylic C–H bond. In each reaction, the weakest C–H bond in the reactant is cleaved in the initial C–H bond activation step. The measured propane oxidative dehydrogenation KIEs are in agreement with theoretical estimates using a sequence of elementary steps, reaction rate expression, and transition state theory. The much smaller KIE for propane oxidative dehydrogenation (2.8) than the maximum KIE (6) expected for propane thermal dehydrogenation indicates the participation of lattice oxygen. The different KIE values for propane primary dehydrogenation and combustion suggest that these two reactions involve different lattice oxygen sites.
Jandierk Grunwaldt - One of the best experts on this subject based on the ideXlab platform.
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structure activity and kinetics of supported molybdenum oxide and mixed molybdenum vanadium oxide catalysts prepared by flame spray pyrolysis for propane ohd
Applied Catalysis A-general, 2014Co-Authors: Martin Hoj, Anker Degn Jensen, Thomas Kessler, Pablo Beato, Jandierk GrunwaldtAbstract:Abstract A series of molybdenum oxide (2 to 15 wt% Mo) and mixed molybdenum–vanadium oxide (4 to 15 wt% Mo and 2 wt% V) on alumina catalysts have been synthesized by flame spray pyrolysis (FSP). The materials were structurally characterized by BET surface area, X-ray diffraction (XRD), Raman and diffuse reflectance UV–vis spectroscopy and evaluated as catalysts for the oxidative dehydrogenation (ODH) of propane. The results show that samples with high specific surface areas between 122 and 182 m 2 /g were obtained, resulting in apparent MoO x and VO x surface densities from 0.7 to 7.7 nm −2 and 1.5 to 1.9 nm −2 , respectively. Raman spectroscopy, UV–vis spectroscopy and XRD confirmed the high dispersion of molybdenum and vanadia species on γ-Al 2 O 3 as the main crystalline phase. Only at the highest loading of 15 wt% Mo, with theoretically more than monolayer coverage, some crystalline molybdenum oxide was observed. For the mixed molybdenum–vanadium oxide catalysts the surface species were separate molybdenum oxide and vanadium oxide monomers at low loadings of molybdenum, but with increasing molybdenum loading interactions between surface molybdenum and vanadium oxide species were observed with Raman spectroscopy. The catalytic experiments showed that the most selective molybdenum oxide catalysts for the ODH reaction were those with high Mo loadings of 7 to 15 wt% Mo, while the most selective mixed molybdenum–vanadium oxide catalyst were at 4 wt% Mo, where separate surface species of molybdenum and vanadium oxide were observed by Raman spectroscopy. A simple kinetic model based on the propane ODH reaction, parallel combustion of propane and sequential combustion of propene described the experimental results well and could be used to determine the optimal reaction conditions.
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structure of alumina supported vanadia catalysts for oxidative dehydrogenation of propane prepared by flame spray pyrolysis
Applied Catalysis A-general, 2013Co-Authors: Martin Hoj, Anker Degn Jensen, Jandierk GrunwaldtAbstract:Abstract A series of five vanadia on alumina catalysts for oxidative dehydrogenation of propane to propene were synthesized by flame spray pyrolysis (FSP) using vanadium(III)acetylacetonate and aluminium(III)acetylacetonate dissolved in toluene as precursors. The vanadium loading was 2, 3, 5, 7.5 and 10 wt.%. The catalysts were subsequently characterized by BET surface area, X-ray diffraction (XRD), Raman, UV–vis diffuse reflectance and X-ray absorption spectroscopy (XAS) as well as measurement of the catalytic performance. The catalysts had specific surface areas from 143 to 169 m 2 /g corresponding to average particles diameters from 9.0 to 10.9 nm and apparent vanadia surface densities from 1.4 to 8.4 VO x /nm 2 . The only crystalline phase detected by XRD was γ-Al 2 O 3 , except at 10 wt.% vanadium where traces of crystalline vanadia were observed. Raman spectroscopy showed vanadia monomers at 2 and 3 wt.% V (1.4 and 2.1 VO x /nm 2 ), a mixture of vanadia oligomers and monomers at 5 wt.% V (3.6 VO x /nm 2 ) and mainly oligomers at 7.5 and 10 wt.% V (6.0 and 8.4 VO x /nm 2 ). Diffuse reflectance UV–vis and extended X-ray absorption fine structure (EXAFS) spectroscopy measurements supported the results of Raman spectroscopy. In situ X-ray absorption near edge structure (XANES) spectroscopy showed that the vanadia can be reduced when operating at low oxygen concentrations. The catalyst performance was determined in fixed bed reactors with an inlet gas composition of C 3 H 8 /O 2 /N 2 = 5/25/70. The main products were propene, CO and CO 2 , with traces of ethene and acrolein. Comparing propene selectivity as function of propane conversion the most selective catalysts were the 2 and 3 wt.% V samples, which contained mostly vanadia monomers according to Raman spectroscopy. The best propene yield of 12% was obtained with the 2 wt.% vanadium catalyst while the best space time yield of 0.78 g propene /(g cat ·h) at 488 °C was obtained with the 3 wt.% V catalyst.
Carlos A Carrero - One of the best experts on this subject based on the ideXlab platform.
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selective oxidative dehydrogenation of propane to propene using boron nitride catalysts
Science, 2016Co-Authors: Joseph T Grant, William P Mcdermott, Carlos A Carrero, F Goeltl, Juan M Venegas, Philipp Mueller, Samuel P Burt, Sarah E Specht, Alessandro Chieregato, Ive HermansAbstract:The exothermic oxidative dehydrogenation of propane reaction to generate propene has the potential to be a game-changing technology in the chemical industry. However, even after decades of research, selectivity to propene remains too low to be commercially attractive because of overoxidation of propene to thermodynamically favored CO 2 . Here, we report that hexagonal boron nitride and boron nitride nanotubes exhibit unique and hitherto unanticipated catalytic properties, resulting in great selectivity to olefins. As an example, at 14% propane conversion, we obtain selectivity of 79% propene and 12% ethene, another desired alkene. Based on catalytic experiments, spectroscopic insights, and ab initio modeling, we put forward a mechanistic hypothesis in which oxygen-terminated armchair boron nitride edges are proposed to be the catalytic active sites.
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critical literature review of the kinetics for the oxidative dehydrogenation of propane over well defined supported vanadium oxide catalysts
ACS Catalysis, 2014Co-Authors: Carlos A Carrero, R Schloegl, Israel E Wachs, R SchomaeckerAbstract:Producing propene by the oxidative dehydrogenation of propane (ODH) has become an attractive and feasible route for bridging the propene production-demand gap, either as a complementary route of the existing oil-based processes or as a new alternative from propane separated from natural gas. The industrial application of propane ODH has not succeeded so far due to low propene yields. Therefore, propane ODH has been extensively investigated in recent decades using different catalysts and reaction conditions. Although several important aspects have been discussed in previous reviews (e.g., supported vanadium oxide catalysts, bulk catalysts, productivity toward propene, etc.), other relevant aspects have not been addressed (e.g., support effects, loading effects, vanadia precursor or catalyst synthesis methods, surface impurities, structure–reactivity relationships, etc.). In this review, we endeavor to cover the majority of the publications with an emphasis on the following: (1) catalyst synthesis: to focus...
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high performance vox n tiox m sba 15 catalysts for the oxidative dehydrogenation of propane
Catalysis Science & Technology, 2014Co-Authors: Carlos A Carrero, Arne Dinse, Robert Schlogl, Annette Trunschke, Markus Kauer, Till Wolfram, Neil G Hamilton, Reinhard SchomackerAbstract:Grafted VxOy catalysts for oxidative dehydrogenation of propane (ODP) have been studied due to their potential high performance and as model catalysts in the past. We report on a positive synergetic effect capable of considerably enhancing the propene productivities above reported performances. The most productive catalysts were found at metal loadings (V + Ti) close to the monolayer coverage. The 4V/13Ti/SBA-15 catalyst presented a considerably high productivity (6–9 kgpropene kgcat−1 h−1). Moreover, with this catalyst, propene productivity only slightly decreased as a function of propane conversion, indicating that propene combustion toward COx occurs more slowly in comparison to other catalysts exhibiting high propene productivities. A detailed kinetic analysis of the 4V/13Ti/SBA-15 catalyst revealed that high vanadia and titania dispersions are required for high propene productivity.
Yoshimori Miyano - One of the best experts on this subject based on the ideXlab platform.
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henry s law constants and infinite dilution activity coefficients of propane propene butane 2 methylpropane 1 butene 2 methylpropene trans 2 butene cis 2 butene 1 3 butadiene dimethylether chloroethane 1 1 difluoroethane and hexane in tetrahydropyran
Journal of Chemical & Engineering Data, 2007Co-Authors: Yoshimori Miyano, Sigemichi Uno, Katsumi Tochigi, Satoru Kato, Hiroshi YasudaAbstract:Henry's law constants and infinite dilution activity coefficients of propane, propene, butane, 2-methylpropane, 1-butene, 2-methylpropene, trans-2-butene, cis-2-butene, 1,3-butadiene, dimethylether, chloroethane, 1,1-difluoroethane, and hexane in tetrahydropyran in the temperature range of (250 to 330) K were measured by a gas stripping method, and partial molar excess enthalpies and entropies were evaluated from the activity coefficients. A rigorous formula for evaluating the Henry's law constants from the gas stripping measurements was used for these highly volatile mixtures. The estimated uncertainties are about 2 % for the Henry's law constants and 3 % for the infinite dilution activity coefficients. The Henry's law constants followed the order of the increasing Henry's law constant with decreases in the normal boiling point temperature of the solutes except for polar solutes. The partial molar excess entropies and enthalpies of the solutes at infinite dilution in tetrahydropyran are smaller than thos...
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henry s constants and infinite dilution activity coefficients of propane propene butane isobutane 1 butene isobutene trans 2 butene and 1 3 butadiene in 2 propanol at 250 330 k
Journal of Chemical & Engineering Data, 2004Co-Authors: Yoshimori MiyanoAbstract:The Henry's constants and the infinite dilution activity coefficients of propane, propene, butane, isobutane, 1-butene, isobutene, trans-2-butene, and 1,3-butadiene in 2-propanol in the temperature range 250 K to 330 K are measured by a gas stripping method. The rigorous formula for evaluating the Henry's constants from the gas stripping measurements is used for these highly volatile mixtures. The accuracy of the measurements is about 2% for Henry's constants and 3% for the estimated infinite dilution activity coefficients. In the evaluations for the infinite dilution activity coefficients, the nonideality of the solute is not negligible, especially at higher temperatures, and the activity coefficients include the estimation uncertainty of about 1%.
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henry s constants and infinite dilution activity coefficients of propane propene butane isobutene 1 butene isobutane trans 2 butene and 1 3 butadiene in 1 propanol at t 260 to 340 k
The Journal of Chemical Thermodynamics, 2004Co-Authors: Yoshimori MiyanoAbstract:Abstract The Henry’s constants and the infinite dilution activity coefficients of propane, propene, butane, isobutane, 1-butene, isobutene, trans-2-butene and 1,3-butadiene in 1-propanol at T=(260 to 340) K are measured by a gas stripping method. The rigorous formula for evaluating the Henry’s constants from the gas stripping measurements is used for these highly volatile mixtures. The accuracy of the measurements is about 2% for Henry’s constants and 3% for the estimated infinite dilution activity coefficients. In the evaluations for the infinite dilution activity coefficients, the nonideality of solute is not negligible especially at higher temperatures and the estimated uncertainty in the infinite dilution activity coefficients include 1% for nonideality.
