贵金属甲烷燃烧催化剂

Low-Temperature Catalytic Combustion of Methane over Noble Metal Catalyst

贵金属催化剂具有较高的甲烷燃烧活性,但是其弱的稳定性抑制了其在VOC脱除以及低浓瓦斯治理等领域的应用,因此提高贵金属甲烷燃烧催化剂的稳定性是目前研究的热点。本文综述了活性组分、载体、助剂和前驱体对贵金属甲烷燃烧催化剂性能的影响;重点介绍了具有较高甲烷燃烧活性的Pd基催化剂受这些因素的影响;结合甲烷燃烧动力学分析了反应组分对催化剂性能的影响;讨论了催化剂失活的机理以及导致研究结论存在较大分歧的原因,提出了避免这些分歧的措施。

Though higher activity contributes to efficient conversion of methane for noble metal catalysts, poor thermal stability restrains their applications in the removal of VOC and ventilation air methane. So many researches focus on the improvement of their stability. The influences of active components, carriers, additives and precursors on catalytic behaviors over methane combustion catalysts, particularly, Pd catalysts, are examined. Inhibition and promotion of reactive species on methane combustion reaction are analyzed on the basis of the kinetic parameters induced. In conclusion, the deactivation mechanisms are indicated for Pd catalysts, and the reasons resulted in great discrepancy on the results studied are pointed out. Solution to higher availability and reproducibility of research results is proposed.