【摘要】 <正> 制备具有大比表面、适宜孔结构的催化剂一直是催化剂研究的重要课题之一.近年,氧化锆、氧化钛载体以其独特性能引起多方面的关注.然而,这两种载体不但本身比表面较小,而且在高温灼烧时比表面急剧下降,所以很难制成高比表面催化剂,极大地限制了它们的应用.本文提出一种制备高比表面负载型催化剂的新方法,它特别适用于TiO₂、ZrO₂.它是在以下两个想法的基础上提出的.（1）我们在工作中曾发现,将仲钼酸铵加到Ti（OH）₄中,经500℃、4小时焙烧,所得的MoO₃/TiO₂（MoO₃质量分数为13.0%）比表面可达133m²·g^-1.而用仲钼酸铵浸渍已晶化更多还原

【Abstract】 In this paper,a new way to increase the specific surface areas of supportedcatalysts has been suggested.The results for MoO₃/ZrO₂, WO₃/ZrO₂,CuO/ZrO₂,SO₄^2-/ZrO₂,NiO/ZrO₂,Fe₂O₃/ZrO₂,Fe₂（SO₄）₃/ZrO₂,MoO₃/TiO₂,WO₃/TiO₂,SO₄^2-/TiO₂,NiSO₄/TiO₂,NiO/TiO₂,V₂O₅/TiO₂ etc.systems show that the specific surface areasof the samples,prepared by impregnating some hydroxides then calcinating at hightemperature,are much larger than those of the samples prepared with a traditionalmethod——impregnating their oxides calcinated at the same temperature.Using thisway,the specific surface areas of some supported catalysts can increase by severaltimes.The surface areas of some supports such as zirconia and titania arc not largeenough,and they are easy to sinter at high temperature.In these cases,the advan-tage of this preparation method is fully displayed,and the specific surface areas ofthe resulting zirconia-or titania-supported catalysts can compare favourably withthose of the catalysts prepared from some classical supports（such as γ-Al₂O₃,SiO₂）.In addition,it has been proved by means of XPS,XRD,LRS,and DTA thatas an active component disperse on a support as a monolayer and its content comesup to its monolayer dispersion capacity,the specific surface area of the obtainedcatalyst would be the largest.We suggest a mechanism that an active compouentcovered on a support can not only segregate its particles,but also hinder the surfacediffusion of support,and as a result,its crystalline growth,an accompanying phasetransformation and inter-crystalline sintering are all retarded.更多还原