摘要
采用微分反应器,研究了新型Re/Pt/Ce0.8Zr0.2O2/蜂窝催化剂上低温水煤气变换反应的动力学行为。利用非线性最小二乘法处理正交设计的实验数据,获得了动力学方程的模型参数。所得的结果符合幂函数型动力学方程,经F检验和相关指数检验,实验值和模拟计算值符合较好。在该催化剂上水煤气变换反应的活化能为70 kJ/mol,与文献中报道的数值相吻合。该催化剂上反应速率对CO、H2O、H2和CO2的反应级数分别为0.09、0.88、-0.54和-0.11,与传统的Cu基低变催化剂上的反应级数相差较大。这表明,低温水煤气变换反应在两种催化剂上遵循不同的反应机理。
The kinetics of the water gas shift （WGS） reaction has been studied over a large range of operation conditions in a differential reactor on the monolithic Re/Pt/Ce0.8 Zr0.2 O2/cordierite eatalyst,which is very active and stable for low-temperature WGS reaction. The experiments were designed by means of orthogonal design, and the model parameters in kinetic equation were estimated using least square non-linear regression analysis. Correlation coefficient examination and F-examination show that the kinetics equation established is statistically indistinguishable, and the calculated data agrees well with the kinetics data. WGS reaction orders for CO, H2O, H2 and CO2 are 0.09, 0.88, - 0.54 and - 0.11, respectively, which are significantly different from those over the traditional Cu-based catalysts. It suggests that low-temperature WGS reaction may occur through different mechanisms over two catalysts.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2008年第5期625-630,共6页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金(20590365,20476103)
