توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Thermodynamic Analysis of Combined CO2 and O2 Reforming of Methane to Produce Syngas
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۶
In this paper, a thermodynamic analysis of Combined CO2 and O2 reforming of methane, using the Gibbs free energy minimization method, has been carried out. Mathematical relationship Lagrange’s undetermined multipliers was applieded and nonelinear equations system was obtained. The nonlinear programming model was implemented and the MATLAB (MATLAB 7.80, R2009a)solver was used to solve the equations. The thermodynamic equilibriums of the combined CO2 and O2 reforming of methane are abviously affected by CH4:CO2:O2 feed ratios and operating temperatures. Optimized conditions for CH4 conversion, hydrogen and monoxide production are temperatures between 1000 to 1100 K and best CH4:CO2:O2 feed ratio are within the range of 1:1:0.2–1:1:0.4.<\div>

۲Carbon Monoxide Oxidation over Iron – Cobalt Mixed Oxide Nanocatalysts
نویسنده(ها): ، ، ،
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۸
In this paper low temperature CO oxidation over iron–cobalt mixed oxide nanocatalysts with different Co\Fe molar ratios was investigated. The nanocatalysts were prepared with a facile precipitation method. The prepared samples were characterized by X–ray diffraction (XRD), N2 adsorption (BET), Thermal gravimetric and differential thermal analyses (TGA\DTA) and Transmition electron microscopy (TEM) techniques. The BET results revealed that the samples showed a mesoporous structure and decreasing in Co\Fe molar ratio shifted the pore size distributions to smaller values. The TEM analysis showed a nanostructure for Co\Fe =1\5 sample with crystallite sizes smaller than 20 nm. The catalytic results showed that the addition of Co to iron oxide even in small amount has a dramatic effect on increasing CO conversion at lower temperatures<\div>

۳CO Oxidation over Iron Oxide Nanocatalysts Prepared via Different Methods and Precursors
نویسنده(ها): ، ، ،
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۶
In this work iron oxide nanoparticles were prepared by a simple precipitation technique with using different precursors and various surfactants during synthesis. The prepared samples were characterized by X–ray diffraction (XRD), N2 adsorption (BET) and Scanning electron microscopy (SEM) techniques. The results show that the activity of iron catalysts in CO oxidation reaction was significantly affected by preparation method and type of precursors. The obtained results indicated that using nitrate precursors and reverse precipitation method for iron oxide preparation have a positive effect on the structural and catalytic properties of iron oxide in CO oxidation reaction<\div>

۴Effect of Calcination Temperature on Structural Properties of Iron–Cobalt Nanocatalysts in Low–Temperature CO Oxidation
نویسنده(ها): ، ، ،
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۷
Iron–Cobalt nanoparticles (Co\Fe molar ratio: 1\5) have been prepared by a simple co–precipitation method and employed as catalyst in low–temperature CO oxidation. The prepared catalysts were characterized by X–ray diffraction (XRD), N2 adsorption (BET), Transmition electron microscopy (TEM) techniques. The results showed that the calcination temperature has a significant effect on catalytic performance of prepared catalysts. Increasing in calcination temperature increased the crystallite and particle size and decreased the specific surface area which caused a decrease in catalytic activity of prepared catalysts.<\div>
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