Pd-Pt/γ-Al_(2)O_(3)催化剂在丙烷催化燃烧中的应用

Application of Pd-Pt/γ-Al_(2)O_(3) catalyst in catalytic combustion of propane

针对丙烷催化燃烧用Pd-Pt/γ-Al_(2)O_(3)催化剂,通过共沉淀法、水热法制备,经涂覆后考察其制备方法对催化剂性能的影响。结果表明,共沉淀法和水热法制备的催化剂对丙烷均具有一定的深度催化氧化活性,并明显受反应气氛湿润度的影响。水热法制备的新鲜催化剂活性和短期稳定性优于共沉淀法制备的催化剂,但老化后减活明显;共沉淀法制备的新鲜催化剂在老化后,活性有适度提升;水热法制备的催化剂结构更敏感,受苛刻条件影响更大,共沉淀法制备的催化剂更耐高温高湿条件。

Pd-Pt/γ-Al_(2)O_(3) catalysts for propane catalytic combustion were prepared by coprecipitation and hydrothermal methods,and the effects of the preparation methods on catalytic performance of the coated catalysts were investigated.The results showed that fresh catalysts had moderate catalytic oxidation activity to propane,which were affected by the water content in the reaction gas.The fresh catalysts prepared by hydrothermal method displayed better activity and short-term stability than the catalyst synthesized by coprecipitation method,but showed obvious deactivation after aging.The activity of fresh catalysts prepared by coprecipitation method was moderately improved after aging.Structure of the catalyst prepared by hydrothermal method was sensitive to harsh conditions,and the catalyst prepared by coprecipitation method exhibited good temperature and humidity resistance.