摘要
采用活塞流管式积分反应器,在1.0MPa压力下,对环境友好铁系无铬NBC 1型高温变换催化剂上变换反应本征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了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:该高温变换催化剂上变换反应活化能比较低,因此其低温活性较好;该催化剂上H2O组分对反应速率的影响比较大;CO2对变换反应速率的抑制作用很大,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很小,在实际应用过程中,可以忽略。
The water gas shift reaction over an environmental friendly iron-based shift catalyst NBC-1 was investigated in a fixed-bed plug flow microreactor at 618?K～723?K and 1.0?MPa. The microkinetics were evaluated by a power law kinetic model, which was found to give an excellent representation of the kinetic data. Comparatively, the activation energy of this catalyst is lower than that of the conventional iron-chromium for the water gas shift reaction, which has higher activity at lower temperature. The influence of H_2O on the reaction rate is greater comparing with traditional ferrochrome shift catalysts, which may be resulted from the additional Ce component in this catalyst. The presence of CO_2 in the reaction system results in the decrease of reaction rate greatly. It is crucial to reduce the resistance effect of the CO_2 in favor of the water gas shift reaction rate. The influence of H_2 on the reaction rate can be neglected.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2004年第2期190-194,共5页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金(20066002)
内蒙古自治区教育基金(ZL9904)
内蒙自然科学基金(990304 2)~~
关键词
铁系催化剂
水煤气变换反应
动力学
environmental friendly
iron-based catalyst
water-gas shift reaction
kinetics
