介孔-微孔复合材料的水热稳定性及其催化裂化性能  

Hydrothermal Stability of Meso-microporous Composites and Their Catalytic Cracking Performance

作　　者：韩伟[1] 贾玉心[1] 熊国兴[1] 杨维慎[1] 

机构地区：[1]中国科学院大连化学物理研究所催化基础国家重点实验室,辽宁大连116023

出　　处：《催化学报》2011年第3期418-427,共10页

基　　金：中国石油化工股份有限公司科学技术研究开发项目(X503008);国家自然科学基金(20321303)

摘　　要：采用无模板剂的溶胶凝胶法制备了一系列具有均一介孔和MFI沸石微孔的复合材料.与MCM-41相比,包含silicalite-1沸石结构的复合材料的水热稳定性得到显著改善.1,3,5-三异丙苯的催化裂化反应结果表明,与商品HZSM-5沸石相比,包含ZSM-5沸石结构的复合材料具有更高的催化活性和抗积炭性能.三异丙苯的转化率和裂化产物的分布主要取决于介孔-微孔复合材料的介孔孔径,较小的介孔孔径有利于提高转化率和生成更多小分子裂化产物.Meso-microporous composites show great promise for catalysis because of their variously-sized porous structures. A series of composites containing uniform mesopores and MFI zeolitic channels were prepared by a template-free sol-gel method. The composite con- taining silicalite-I structures was found to be much more hydrothermally stable than MCM-41. The composites with ZSM-5 structures showed higher catalytic activity and resistance to deactivation than commercial HZSM-5 in the catalytic cracking reaction of 1,3,5-triisopropylbenzene. The conversion and catalytic cracking product distribution of 1,3,5-triisopropylbenzene depended highly on the mesopore size of the composites. Higher conversions and small molecule cracking products were obtained using composites with smaller mesopores.

关 键 词：介孔-微孔复合材料 MFI沸石 水热稳定性 1 3 5-三异丙苯 催化裂化 

分 类 号：O643.36[理学—物理化学]