MCM-41负载SO_4^(2-)/ZrO_2超强酸的性能研究

Studies on MCM-41 Supported SO_4^(2-) 4/ZrO_2 Solid Superacid Catalysts

采用浸渍 -焙烧法制备了 MCM-4 1负载 SO2 - 4 /Zr O2 ( SZ)超强酸催化剂 ,并考察了其织构性质及酸性的变化规律 .结果发现 ,过高的 SZ负载量会引起 MCM-4 1介孔结构的破坏 ,而负载量过低则不能产生超强酸性 .适宜的负载量为 4 0 %左右 .样品的超强酸性随其 Zr O2 含量的增加而递增 .SZ的引入同时也增加了样品的中强酸酸性和弱酸酸性 ,样品酸性可通过改变

A series of new superacid catalysts MCM 41 supported SO 2- 4/ZrO 2(SZ) were prepared first by an impregnation calcination method. The variation roles of their texture constructions and acid properties were investigated in detail. It was shown that, a high amount of ZrO 2 could result in the damage of the pore system of MCM 41, however, superacid sites could not formed under a low amount of SZ on MCM 41. The proper amount of SZ is about 40%. The superacidities of samples were increased with the increas\|ing of ZrO 2 contents. Both medium strong acidities and weak acidities of samples were enhanced with the introducing of SZ. The acidities of samples can be adjusted by changing the amount of SZ on MCM 41. This may be valuable in designing catalysts for the cracking reaction of large molecule hydrocarbon.