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kinetics modeling for the mixed reforming of methane over Ni-CeO_2/MgAl_2O_4 catalyst

Journal of Natural Gas Chemistry 2011年第1期20卷 9-17页

作者： Hye Jin Jun Myung-June Park Seung-Chan Baek Jong Wook Bae Kyoung-Su Ha Ki-Won Jun Department of Chemical Engineering Ajou University Petroleum Displacement Technology Research Center Korea Research Institute of Chemical Technology (KRICT)

kinetics model was developed for the mixed （steam and dry） reforming of methane, which is useful for the control of H2/CO ratio. The equilibrium constants of reaction rate were determined using the experimental equilibrium data at different reaction temperatures, while the forward reaction rate constants were estimated using the experimental data under non-equilibrium （high inert fraction and high space velocity） conditions. The comparison between calculated and experimental data clearly showed that the developed model described satisfactorily, and further analysis using the parametric sensitivity determined the wall temperature and CO2 fraction in the feed gas as effective parameters for the manipulation of CH4 conversion and H2/CO ratio of synthesis gas under the equilibrium condition. Meanwhile, the inert fraction, rather than the residence time, was selected as additional parameter under non-equilibrium condition.

关键词： mixed reforming nickel-based catalyst kinetics modeling parameter estimation parametric sensitivity

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Isolation and Sorption Behavior of Humic Acid from Zhongdian Peat of Yunnan Province,China

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Pedosphere 2009年第5期19卷 606-614页

作者： NING Ping WANG Hong-Bin PAN Bo H.-J. BART YANG Min College of Environmental Science and Engineering Kunming University of Science and Technology Kunming 650093 （China） Lehrstuhl fiir Thermisehe Verfahrenstechnik University of Kaiserslautern Kaiserslautern D-67653 （Germany）

The Zhongdian swamp meadow in Zhongdian,China is well known as "Shangri-la",where the peat has never been studied for its potential to interact with *** acid(HA) was extracted from Zhongdian peat using two methods,namely sodium pyrophosphate extraction(SPE) and dilute base extraction(DBE),and characterized for its functional groups and sorption *** HAs extracted by both methods contained several active functional groups and had large external specific surface *** adsorption mechanism of methylene blue onto HAs was interpreted as Langmuir ***-HA showed higher sorption capacity because of its larger specific surface area,whereas the extraction yield of DBE-HA was twice that of *** modeling indicated that the sorption of methylene blue was a two-component first order *** component with the higher rate constant also showed higher sorption *** pH effect was observed for methylene blue sorption on HA in our experimental design,and the sorption decreased as the temperature increased.

关键词： extraction kinetics modeling Langmuir methylene blue Shangri-la

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Chemical Effects of CO2 Concentration on Soot Formation in Jet-stirred/Plug-flow Reactor

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Chinese Journal of Chemical Engineering 2013年第11期21卷 1269-1283页

作者：张引弟娄春刘德华李勇阮龙飞 Yangtze University Research for China National Petroleum Corporation Key Laboratory of Oil Gas Production Yangtze University Wuhan 430100 China State Key Laboratory of Coal Combustion Huazhong University of Science and Technology Wuhan 430074 China Gas Lift Technology Center of Tuba Oilfield of China National Petroleum Corporation Hami 838202 China

Soot formation was investigated numerically with CO2 addition in a jet-stirred/plug-flow reactor （JSR/PFR） C2H4/OJN2 reactor （C/O ratio of 2.2） at atmospheric pressure. An updated Kazakov mechanism empha- sizes the effect of the O2/CO2 atmosphere instead of an O2/N2 one in the premixed flame. The soot formation was taken into account in the JSR/PFR for C2H4/O2/N2. The effects of CO2 addition on soot formation in different C2H4/O2/CO2/N2 atmospheres were studied, with special emphasis on the chemical effect. The simulation shows that the endothermic reaction CO2 ＋ H - CO ＋ OH is responsible of the reduction of hydrocarbon intermediates in the CO2 added combustion through the supplementary formation of hydroxyl radicals. The competition of CO2 for H radical through the above forward reaction with the single most important chain branching reaction H ＋ O2, ＇ O ＋ OH reduces significantly the fuel burning rate. The chemical effects of CO2 cause a significant increase in residence time and mole fractions of CO and OH, significant decreases in some intermediates （H, C2H2）, polycyclic aromatic hydrocarbons （PAHs, C6H6 and CI6H10, etc.） and soot volume fraction. The CO2 addition will leads to a decrease by only about 5% to 20% of the maximum mole fractions of some C3 to Clo hydrocarbon intermediates. The sensitivity analysis and reaction-path analysis results show that C2H4 reaction path and products are altered due to the CO2 addition.

关键词： fuel enrichment carbon dioxide kinetics modeling soot formation jet-stirred/plug-flow reactor

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Kinetic modeling of the Photocatalytic Degradation of Methyl Orange by Supported TiO2

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Journal of Environmental Science and Engineering 2010年第5期4卷 1-5页

作者： N. Barka S. Qourzal A. Assabbane Y. Ait-Ichou Equipe de Matdriaux Photocatalyse et Environnement Departement de Chimie Facultd des Sciences d＇Agadir. BP： 8106 Hay Dakhla Agadir Morocco

The photocatalytic degradation of methyl orange （MO） in UV/Supported-TiO2 system was investigated and a kinetic model was presented. The experimental results show that the photocatalytic degradation rate is favored by high concentration of dye in solution and is enhanced by the solution temperature. A simple kinetic model has been proposed which can describe the discoloration process in an adequate way. The calculated results obtained were in good agreement with experimental data. The model predicts the concentration of MO during the photocatalytic degradation process.

关键词： kinetics modeling photocatalysis methyl orange supported TiO2.

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