介孔MgAl_2O_4涂层整体式氢气燃烧催化剂的制备与表征

Synthesis and Characterization of H_2 Combustion Monolithic Catalyst Based on Mesoporous MgAl_2O_4 Spinel Coating

以广义酸-碱对理论为依据,报道了一种仅利用纯无机碱和盐为原料在蜂窝陶瓷载体上制备介孔MgAl2O4涂层的方法,并通过原位酸碱反应对涂层进行CexZr1-xO2修饰和Pt的负载,成功制备出具有高催化活性的整体式氢气燃烧催化剂.通过扫描电子显微镜(SEM),X射线衍射仪(XRD)以及N2吸/脱附分析仪表征了催化剂的微观结构.结果表明复合涂层不仅具有均匀的微晶结构,而且具有高的比表面积(>250m2·g-1)和大的孔容(0.32cm3·g-1).氢气催化燃烧反应结果显示,制备的整体式催化剂具有很高的催化活性,可以在室温下快速起燃,并且氢气的初始转化率达到95%以上.

A novel method to prepare mesoporous MgAl2O4 coating on the honeycomb cordierite ceramics from only inorganic salt and alkali by the generalized Lewis acid-base theory was reported.The Pt-based monolithic catalysts were prepared successfully after CexZr1-xO2 modified and Pt loaded by in-situ acid-alkali reaction.The samples were characterized by scanning electron microscope（SEM）,X-ray diffrac-tion（XRD）,and N2-sorption.The results showed that the coating had uniform microcrystal structure as well as high surface area（250 m2og-1） and large pore volume（0.32 cm3og-1）.The investigations of H2 catalytic combustion showed these monolithic catalysts could fastly start up even at room temperature,and H2 initial conversion could reach more than 95%.