微小圆管内正丁醇催化燃烧及动力学特性

通过实验研究在4 mm的石英管中以Pt/ZSM-5为催化剂的正丁醇催化燃烧反应，对比讨论当量比、流量对正丁醇催化效应的影响，分析转化率、产物浓度、燃烧效率等催化燃烧特性，拟合计算表观活化能.研究结果显示，保持体积空速小于19 080 h-1，流量对丁醇在该微小圆管内的催化燃烧影响较小；气体总流量不变，减小混合气体的当量比，正丁醇的转化率大幅提高，表明氧在催化剂表面的吸附是正丁醇在Pt/ZSM-5表面反应的主导因素.当量比=1时，乙醛、二甲醚、一氧化碳等中间产物较多；当量比=0.3时，一氧化碳几乎没有被检测到.减少混合气体的流量和减小混合气体的当量比，正丁醇的燃烧效率都会提高.正丁醇在Pt/ZSM-5上反应的表观活化能为（110±20） kJ/mol，在低当量比、低流量下，正丁醇在催化剂下反应的表观活化能更小.
Abstract: The catalytic reaction of n-butanol with Pt/ZSM-5 in a 4 mm quartz tube was experimentally analyzed. The effects of equivalence ratio and flow rate on the catalytic effect of butyl alcohol were compared and discussed. The combustion performance, including the conversation of n-butanol with temperature, product concentration, combustion efficiency,the apparent activation energy, was analyzed. The effect of flow rate on the catalytic combustion of butanol in the micro tube was small when the volume space velocity was less than 19080 h-1. Decrease of the equivalence ratio at a fixed flow rate yielded a higher catalytic performance toward the conversation of n-butanol, indicating that the adsorption of oxygen was the dominant factor for the reaction of n-butanol on the surface of Pt/ZSM-5. More intermediate products like acetaldehyde, dimethyl ether, carbon monoxide were detected when the equivalence ratio was 1; there was no carbon monoxide when the equivalence ratio was 0.3. Decrease of the equivalence ratio or the flow rate both yielded higher combustion efficiency. The apparent activation energy of the reaction of n-butanol with Pt/ZSM-5 was (110 ±20) kJ/mol, and the apparent activation energy of the reaction was smaller at a low equivalence ratio or low flow rate.