铁铬系B113-2型高变催化剂上变换反应宏观动力学

本文采用内循环无梯度反应器，在3．0MPa压力范围内，对国产B113-2型铁铬系高温变换催化剂上变换反应宏观动力学数据进行了测试．根据测定得到的数据．对幂函数动力学模型进行丁模型参数估计和模型检验，得到了高度显著的动力学回归方程．从动力学方程可以得出：该高温变换催化剂内扩散影响严重；该催化剂上CO2组分对反应速率的影响与其它铁系变换催化剂相比变小，推测可能是由于扩散影响或是该催化剂中Cu组分作用的结果；CO2对变换反应速率还是存在一定的抑制．因此为提高变换反应速率，应当设法减小CO2的不利影响；H2组分对反应速率的影响均比较小，在实际应用过程中，可以忽略．压力对变换反应速率影响较大．3．0MPa压力以下．反应速率随着压力的增加线性提高，但在1．0MPa以下时的增加速度明显高于1．0MPa以上的增加速率．

THE MACROKINETICS OF WATER-GAS SHIFT REACTION ON B113-2 SHIFT CATALYST

Experiments are made on water-gas shift reaction on the industrial ferrochrome shift catalyst B113-2,produced in an internal-circulation gradientless reactor working at a pressure below 3.0 MPa.Different dependencies of the macrokinetics are evaluated by use of a power function kinetic model,and an excellent representation of the kinetic data is given.It is found that the inter-grain diffusion has remarkable impact on the macrokinetics.The influence of CO_2 on the reaction is less significant than that of other traditional ferrochrome shift catalysts,which,very possibly,results from the diffusion or the behavior of Cu in this catalyst.As CO_2,to a certain extent,inhibits the shift reaction rate,some way must be found to reduce the adverse effect of CO_2in order to increase the shift reaction rate.The influence of H_2on the reaction rate is negligible.The increase of the reaction pressure favors the reaction rate and the latter rises linearly with the former below 3.0 MPa.