The Experts below are selected from a list of 118806 Experts worldwide ranked by ideXlab platform
Huijun Zhao - One of the best experts on this subject based on the ideXlab platform.
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highly dispersed co and ni nanoparticles encapsulated in n doped carbon nanotubes as efficient catalysts for the reduction of unsaturated Oxygen Compounds in aqueous phase
Catalysis Science & Technology, 2018Co-Authors: Wanbing Gong, Chun Chen, Haimin Zhang, Guozhong Wang, Huijun ZhaoAbstract:N-Doped carbon nanotube-encapsulated metal nanoparticles are of great interest in heterogeneous catalysis owing to their improved mass transfer ability and superior stability. Herein, a facile one-pot pyrolysis approach using melamine as the carbon and nitrogen source was developed to fabricate metal nanoparticles embedded in bamboo-like N-doped carbon nanotubes (named as Co@NCNTs-600-800 and Ni@NCNTs-600-800). The optimized Co@NCNTs-600-800 catalyst exhibited outstanding activity in furfural (FAL) selective hydrogenation to furfuryl alcohol (FOL) or cyclopentanone (CPO) in aqueous media. High yields of FOL (100%) and CPO (75.3%) were achieved at 80 °C and 140 °C, respectively. Besides, this cobalt catalyst showed very good stability and recyclability during the reaction. The synergistic effect between metallic cobalt and N-doped carbon nanotubes was systematically investigated. In addition, the as-prepared Ni@NCNTs-600-800 catalyst also exhibited remarkable activity. Under optimal conditions (100 °C and 4 MPa H2 pressure), a maximum tetrahydrofurfuryl alcohol (THFOL) yield (99.5%) was obtained in the aqueous-phase hydrogenation of FAL. The research thus highlights new perspectives for non-noble metal-based N-doped carbon nanotube catalysts for biomass transformation.
Didier Dalmazzone - One of the best experts on this subject based on the ideXlab platform.
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prediction of enthalpy of formation in the solid state at 298 15k using second order group contributions part 2 carbon hydrogen carbon hydrogen Oxygen and carbon hydrogen nitrogen Oxygen Compounds
Journal of Physical and Chemical Reference Data, 2007Co-Authors: Anna Salmon, Didier DalmazzoneAbstract:A program has been undertaken to develop a new group contribution method, based on Benson's group additivity technique, estimate as precisely as possible solid state enthalpies of formation, at 298.15 K, of C-H Compounds, C-H-O Compounds, and C-H-N-O Compounds. A set of 1017 experimental values of the enthalpy of formation has been studied and compared to the predicted values of this new method as well as the method of Domalski and Hearing. This new estimation technique leads to a higher precision and reliability. With the inclusion of additional group values, a wider range of Compounds can be studied (compared to the Domalski and Hearing technique). Comparison with a quantum mechanical method [Rice et al., Combust. Flame 118, 445 (1999)] shows that the list of group contribution values, ring strain corrections, and non-nearest neighbor interactions provided here yields better estimates overall. Prediction of Enthalpy of Formation in the Solid State (at 298.15 K) Using Second-Order Group Contributions-Part 2: Carbon-Hydrogen, Carbon-Hydrogen-Oxygen, and Carbon-Hydrogen-Nitrogen-Oxygen Compounds.
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prediction of enthalpy of formation in the solid state at 298 15 k using second order group contributions part 1 carbon hydrogen and carbon hydrogen Oxygen Compounds
Journal of Physical and Chemical Reference Data, 2006Co-Authors: Anna Salmon, Didier DalmazzoneAbstract:A predictive method, based on Benson’s group additivity technique, is developed for calculating the enthalpy of formation in the solid phase, at 298.15K, of carbon-hydrogen Compounds and carbon-hydrogen-Oxygen Compounds. A complete database compiles 398 experimental enthalpies of formation. The whole group contribution values, ring strain corrections, and nonnearest neighbor interactions evaluated are listed. Finally a comparison with Cohen’s method indicates that this new estimation method leads to higher precision and reliability.
Anna Salmon - One of the best experts on this subject based on the ideXlab platform.
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prediction of enthalpy of formation in the solid state at 298 15k using second order group contributions part 2 carbon hydrogen carbon hydrogen Oxygen and carbon hydrogen nitrogen Oxygen Compounds
Journal of Physical and Chemical Reference Data, 2007Co-Authors: Anna Salmon, Didier DalmazzoneAbstract:A program has been undertaken to develop a new group contribution method, based on Benson's group additivity technique, estimate as precisely as possible solid state enthalpies of formation, at 298.15 K, of C-H Compounds, C-H-O Compounds, and C-H-N-O Compounds. A set of 1017 experimental values of the enthalpy of formation has been studied and compared to the predicted values of this new method as well as the method of Domalski and Hearing. This new estimation technique leads to a higher precision and reliability. With the inclusion of additional group values, a wider range of Compounds can be studied (compared to the Domalski and Hearing technique). Comparison with a quantum mechanical method [Rice et al., Combust. Flame 118, 445 (1999)] shows that the list of group contribution values, ring strain corrections, and non-nearest neighbor interactions provided here yields better estimates overall. Prediction of Enthalpy of Formation in the Solid State (at 298.15 K) Using Second-Order Group Contributions-Part 2: Carbon-Hydrogen, Carbon-Hydrogen-Oxygen, and Carbon-Hydrogen-Nitrogen-Oxygen Compounds.
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prediction of enthalpy of formation in the solid state at 298 15 k using second order group contributions part 1 carbon hydrogen and carbon hydrogen Oxygen Compounds
Journal of Physical and Chemical Reference Data, 2006Co-Authors: Anna Salmon, Didier DalmazzoneAbstract:A predictive method, based on Benson’s group additivity technique, is developed for calculating the enthalpy of formation in the solid phase, at 298.15K, of carbon-hydrogen Compounds and carbon-hydrogen-Oxygen Compounds. A complete database compiles 398 experimental enthalpies of formation. The whole group contribution values, ring strain corrections, and nonnearest neighbor interactions evaluated are listed. Finally a comparison with Cohen’s method indicates that this new estimation method leads to higher precision and reliability.
Sylvette Brunet - One of the best experts on this subject based on the ideXlab platform.
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transformation of dibenzothiophenes model molecules over comop al2o3 catalyst in the presence of Oxygenated Compounds
Applied Catalysis B-environmental, 2013Co-Authors: M Philippe, Frederic Richard, D Hudebine, Sylvette BrunetAbstract:Abstract Decanoic acid is one of the most inhibiting Compounds with CO in the transformation of the most refractory sulfur Compounds in gas oils. Unlike phenols Compounds, decanoic acid and CO its main by-product present a strong inhibiting effect in the conversion of sulfur Compounds. The effects are due to phenomena of competitive adsorption between sulfur and Oxygen Compounds on the catalyst surface. Furthermore, according to Oxygenated molecules, the impact on both transformation pathways (HYD and DSD) mainly involved in HDS of gas oils is not the same. Decanoic acid and CO have a greater impact on the DSD way involved in the transformation of DBT than in HYD way involved in the transformation of 46DMDBT. These results confirmed that these two reactions require two different sites located in sulfur and metal edges of the catalyst.
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inhibiting effect of Oxygenated model Compounds on the hds of dibenzothiophenes over comop al2o3 catalyst
Applied Catalysis A-general, 2010Co-Authors: M Philippe, Frederic Richard, D Hudebine, Sylvette BrunetAbstract:Abstract The effect of Oxygen Compounds (guaiacol and phenol) on the hydrodesulfurization (HDS) of 4,6-dimethyldibenzothiophene (46DMDBT) and dibenzothiophene (DBT) was studied on a sulfided CoMoP/Al2O3 catalyst in a fixed bed microreactor (340 °C, 4.0 MPa). The reaction scheme of the transformation of guiaicol and of phenol (the main intermediate in the transformation of phenol) was established under deep HDS operating conditions. The transformation of phenol involved two main routes: a hydrogenation pathway (HYD) involving first the hydrogenation of the aromatic rings followed by C–O bond rupture (leading to the formation of benzene) and a direct deOxygenation (DDO) pathway involving only a C–O bond rupture (leading to cyclohexane). These two ways were independent, no transformation of benzene into cyclohexane was observed. Both Oxygen Compounds inhibited the hydrodesulfurization of sulfur Compounds due to competitive adsorption between the Oxygen and sulfur containing Compounds, with the effect of guaiacol being stronger than the effect of phenol. The inhibition was similar in the transformation of 46DMDBT and DBT for the same Oxygen molecule, showing that the two main routes (HYD and DDS) involved in the HDS were affected in the same way. This corresponds to a competitive adsorption between the Oxygen and sulfur Compounds containing on the catalyst surface according to a Langmuir–Hinshelwood model.
N Cohen - One of the best experts on this subject based on the ideXlab platform.
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revised group additivity values for enthalpies of formation at 298 k of carbon hydrogen and carbon hydrogen Oxygen Compounds
Journal of Physical and Chemical Reference Data, 1996Co-Authors: N CohenAbstract:A program has been undertaken for the evaluation and revision of group additivity values (GAVs) necessary for predicting, by means of Benson’s group additivity method, thermochemical properties of organic molecules. This review reports on the portion of that program dealing with GAVs for enthalpies of formation at 298.15 K (hereinafter abbreviated as 298 K) for carbon–hydrogen and carbon–hydrogen–Oxygen Compounds. A complete database of experimental data for gas, liquid, and crystal (solid) phase enthalpies of formation is presented. The GAVs, ring strain corrections, and non‐nearest neighbor interactions derived from the database are presented in tabular form, together with a description of their evaluation and comments on reliability, uncertainties, and missing or questionable data.
