The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Masami Onoda - One of the best experts on this subject based on the ideXlab platform.
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co2 capture by tertiary amine absorbents a performance comparison study
Industrial & Engineering Chemistry Research, 2013Co-Authors: Firoz Alam Chowdhury, Hidetaka Yamada, Takayuki Higashii, Kazuya Goto, Masami OnodaAbstract:In the present paper, we investigated CO2 capture with 24 tertiary amine absorbents, including three synthetic amines, with systematic modification of their chemical structures. Aqueous solutions of the amines (mass fraction 30%) were used to evaluate the performance for CO2 capture. Gas scrubbing, vapor–liquid equilibrium (VLE), and Reaction calorimetry experiments were conducted in the laboratory to obtain the absorption rate, the amount of CO2 absorbed, cyclic CO2 capacity, and Heat of Reaction for each absorbent. The results for these absorbents were compared with the conventional tertiary absorbent N-methyldiethanolamine (MDEA). Seven of the investigated absorbents performed well with high absorption rates and cyclic capacities. Among these absorbents, some showed lower Heats of Reaction than MDEA. These results provide basic guidelines for discovery of potential tertiary amine-based absorbents that may lead to development of new absorbent systems in the CO2 capture area.
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development of novel tertiary amine absorbents for co2 capture
Energy Procedia, 2009Co-Authors: Firoz Alam Chowdhury, Masami Onoda, Hiromichi Okabe, Shinkichi Shimizu, Yuichi FujiokaAbstract:Abstract In the framework of the COCS (Cost Saving CO 2 Capture System) project we continue to develop high performance CO 2 absorbents to reduce the regeneration energy cost to almost half the current cost. To achieve this target we investigated twenty five tertiary amine based CO 2 absorbents with different chemical structures. Solvent selection procedures were carried out based on their CO 2 absorption rate, loading capacity and Heat of Reaction measurements. We found several high performance absorbents with advantages of high absorption rate and low Heats of Reaction compared to MDEA.
Firoz Alam Chowdhury - One of the best experts on this subject based on the ideXlab platform.
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co2 capture by tertiary amine absorbents a performance comparison study
Industrial & Engineering Chemistry Research, 2013Co-Authors: Firoz Alam Chowdhury, Hidetaka Yamada, Takayuki Higashii, Kazuya Goto, Masami OnodaAbstract:In the present paper, we investigated CO2 capture with 24 tertiary amine absorbents, including three synthetic amines, with systematic modification of their chemical structures. Aqueous solutions of the amines (mass fraction 30%) were used to evaluate the performance for CO2 capture. Gas scrubbing, vapor–liquid equilibrium (VLE), and Reaction calorimetry experiments were conducted in the laboratory to obtain the absorption rate, the amount of CO2 absorbed, cyclic CO2 capacity, and Heat of Reaction for each absorbent. The results for these absorbents were compared with the conventional tertiary absorbent N-methyldiethanolamine (MDEA). Seven of the investigated absorbents performed well with high absorption rates and cyclic capacities. Among these absorbents, some showed lower Heats of Reaction than MDEA. These results provide basic guidelines for discovery of potential tertiary amine-based absorbents that may lead to development of new absorbent systems in the CO2 capture area.
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development of novel tertiary amine absorbents for co2 capture
Energy Procedia, 2009Co-Authors: Firoz Alam Chowdhury, Masami Onoda, Hiromichi Okabe, Shinkichi Shimizu, Yuichi FujiokaAbstract:Abstract In the framework of the COCS (Cost Saving CO 2 Capture System) project we continue to develop high performance CO 2 absorbents to reduce the regeneration energy cost to almost half the current cost. To achieve this target we investigated twenty five tertiary amine based CO 2 absorbents with different chemical structures. Solvent selection procedures were carried out based on their CO 2 absorption rate, loading capacity and Heat of Reaction measurements. We found several high performance absorbents with advantages of high absorption rate and low Heats of Reaction compared to MDEA.
Byung-hun Jeong - One of the best experts on this subject based on the ideXlab platform.
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catalytic endothermic Reactions of exo tetrahydrodicyclopentadiene with zeolites and improvement of Heat of Reactions
Catalysis Today, 2014Co-Authors: Dong Hun Hyeon, Byung Hee Chun, Sun-hee Park, Byung-hun JeongAbstract:Abstract Catalytic endothermic Reactions of exo -tetrahydrodicyclopentadiene ( exo -THDCP) with different zeolites were investigated in a batch reactor to increase the Heat of Reaction. The Heat of Reaction with each zeolite was calculated by the NIST SUPERTRAPP program. The conversion and product distribution were also investigated because they affected the Heat of Reaction. The Heat of Reaction of HZSM-5 was larger than those of other zeolite due to its total acid density and pore structures. It showed the highest conversion and highest composition of low molecular weight products. Because dehydrogenation can increase endothermic Heat, Pt/HZSM-5 (1 wt% Pt loaded) was used in the endothermic Reaction. The metal sites led the dehydrogenation of saturated hydrocarbons and increase in olefins. To increase the Heat of Reaction, high conversion and high yield of low molecular weight hydrocarbons and olefins are necessary.
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improvement of the Heats of Reaction in endothermic Reactions of methylcyclohexane with zeolites
Catalysis Today, 2012Co-Authors: Sun-hee Park, Byung Hee Chun, Byung-hun JeongAbstract:Abstract Endothermic Reactions of methylcyclohexane (MCH) with zeolites were investigated in a batch reactor to increase the Heats of Reaction. Conversion and product distribution affected the Heat of Reaction. The Heat of Reaction with HZSM-5, which led to the formation of low-molecular-weight hydrocarbon products, was larger than the Heats of Reaction with other zeolites. To improve the Heat of Reaction with HZSM-5, Pt/HZSM-5 (1 wt.% Pt) was used in endothermic Reactions. In endothermic Reactions with Pt/HZSM-5, the Heats of Reaction increased, and there was a high yield of olefins, which were formed by dehydrogenation of paraffin on metal sites. A high conversion and high yield of low-molecular-weight hydrocarbons and olefins led to an increase in the Heat of Reaction.
Salvatore Miraglia - One of the best experts on this subject based on the ideXlab platform.
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A new MgH2 tank concept using a phase change material to store the Heat of Reaction
International Journal of Hydrogen Energy, 2015Co-Authors: Patricia De Rango, Sylvain Garrier, Baptiste Delhomme, Daniel Fruchart, Pierre Marty, Philippe Marty, Salvatore MiragliaAbstract:The formation of magnesium hydride under hydrogen pressure is highly exothermic. The enthalpy of Reaction represents 31% of the lower Heating value (LHV) of the absorbed hydrogen. A new concept of MgH2 tank was developed to store the Heat of Reaction by using a phase-change material (PCM). The Heat of desorption is mainly provided by the latent Heat of solidification of the PCM. A metallic alloy based on Mg-Zn eutectic was selected as PCM in order to enhance the thermal exchange with the MgH2 compacts. A pilot tank of about 7000 NL of hydrogen was designed and tested under various experimental conditions. Desorption was achieved in 3 h and the daily storage efficiency was around 70%.
Naoyuki Kanetake - One of the best experts on this subject based on the ideXlab platform.
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combustion synthesis of porous tic ti composite by a self propagating mode
Materials, 2010Co-Authors: Makoto Kobashi, Daishi Ichioka, Naoyuki KanetakeAbstract:Porous titanium carbide (TiC) and TiC/Ti composites were synthesized by self-propagating high-temperature synthesis (SHS). Titanium and carbon powders were blended by various Ti/C blending ratios. The Heat of Reaction between titanium and carbon was high enough to induce the self-sustaining Reaction of TiC formation on condition that some processing parameters (Ti/C ratio and porosity of the precursor) were appropriately selected. When the Ti/C blending ratio was high, the excess amount of titanium absorbed the Heat of Reaction. Consequently, the Heated zone was not Heated up to the ignition temperature. On the other hand, when the Ti/C ratio was low, high thermal conductivity of the precursor prevented an ignition of the Heated side of precursors. The pore morphology was controlled by changing the Ti/C ratio and the preHeat temperature.
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effect of elemental powder blending ratio on combustion foaming behavior of porous al ti intermetallics and al3ti al composites
Intermetallics, 2010Co-Authors: Makoto Kobashi, Norio Inoguchi, Naoyuki KanetakeAbstract:Abstract Porous Al–Ti intermetallics and Al3Ti/Al composites were fabricated by combustion foaming process. Fundamentally, aluminum and titanium powders were blended (Al/Ti mole blending ratios ranging from 0.33 to 10.0). Additionally, boron carbide (B4C) powder was blended as exothermic agent since the Heat of TiC and TiB2 formation is much higher than those of Al–Ti intermetallics. The blended powder compact was Heated to induce the combustion Reaction. Isotropic closed pores were produced by this process. By adding 10 vol.% exothermic agent, the porosity exceeded 60% in a wide range of Al/Ti ratios (3.0–10.0). It was confirmed that high Heat of Reaction of exothermic agent assisted the complete conversion of aluminum and titanium powders to Al3Ti.
