甲烷催化燃烧反应工艺研究进展

甲烷催化燃烧是一种清洁高效的甲烷燃烧技术，在节能减排中具有重要的应用价值。从催化剂、反应工艺和过程强化等方面对近年来甲烷催化燃烧技术进行综述，重点介绍颗粒催化剂固定床反应工艺、整体式催化剂反应工艺、流化床反应工艺和吸放热耦合反应工艺研究进展。用于固定床反应器的颗粒催化剂主要为负载型贵金属催化剂和非贵金属氧化物催化剂。贵金属催化剂活性好，起燃温度低，适合低浓度甲烷的催化燃烧。非贵金属氧化物催化剂耐高温性好，适合较高浓度甲烷燃烧体系。整体式催化剂的甲烷催化燃烧反应工艺中，最常用的是蜂窝陶瓷和金属合金等整体式催化剂的多段式催化燃烧反应器的设计。设计直接采用多段式整体催化剂，催化剂的位置不同，发挥的催化作用也不同。流化床催化燃烧装置具有燃烧过程接触面积广、热容量大和换热效率高等特点，可有效避免传统的固定床催化燃烧反应工艺存在的问题，非常适合应用于低浓度甲烷的催化燃烧过程。利用甲烷催化燃烧强放热的特点，将催化燃烧产生的热量进行时间或空间的耦合，可以开发出吸-放热耦合反应工艺。其中，固定床催化反应器中的流向变换强制周期操作作为一种高效的过程强化技术，在节约反应器成本的同时，可以提高反应热量的利用率。

Progress in reaction process for catalytic combustion of methane

Compared with the conventional flame combustion,the catalytic combustion of methane is a clean and efficient methane burning technology. It possesses an importance application value in the energy saving and the emission reduction. In this paper,the recent research progress in methane catalytic com-bustion such as the catalysts,catalytic combustion process,and methane catalytic combustion process intensification technologies were reviewed. Moreover,the methane catalytic combustion reaction process of the fixed bed with the particle catalysts,the monolithic catalysts,the fluidized bed,and the coupling of exothermic and endothermic reaction process were focused. The particle catalysts used in the fixed bed reactor mainly were noble metal catalysts and non-noble metal oxide catalysts. Noble metal catalysts with high activity and low light-off temperature were suitable for catalytic combustion of methane with low con-centration. Non-noble metal oxide catalysts with good resistance to high temperature were suitable for com-bustion system of methane with high concentration. Monolithic catalysts for methane catalytic combustion commonly used honeycomb ceramics and metal alloy as monolithic carriers. Monolithic catalysts were＆amp;nbsp;applied to the design process of sectionalized catalytic combustion reactor. The catalysts in different position play a different role. Fluidized bed catalytic combustion reactor with wide contact area,large combustion heat capacity and high thermal efficiency,which could effectively avoid the existing problems of traditional fixed bed catalytic combustion process,was suitable for application in the catalytic combustion of methane with low concentration. Methane catalytic combustion is a strongly exothermic reaction. An endothermic and exothermic coupling reaction technology was developed by the coupling of time or space of catalytic combustion heat. Among them,the fixed bed catalytic reactor reverse flow operation,as a highly efficient process intensification technology,could improve the