中孔分子筛的合成及作为FT合成催化剂载体的应用

SYNTHESIS OF MESOPOROUS MOLECULAR SIEVES AND THEIR APPLICATION AS SUPPORTS FOR CATALYSTS IN FT SYNTHESIS

分别用季铵盐和中性一级胺为模板剂，在水热条件下和常温常压下合成了纯Ｓｉ和含Ａｌ的中孔分子筛；用ＢＥＴ，ＸＲＤ，ＳＥＭ等手段表征了它们的孔道和骨架结构，对中孔分子筛的生成机理进行了探讨。研究发现，不同的介质，不同的模板剂以及不同的硅、铝源都可以影响产物的最终结构和稳定性。在碱性介质中用季胺盐作模板剂，用无机硅源的条件下，水热过程是形成中孔分子筛稳定晶格的必要条件。室温条件下合成中孔分子筛，体系的静电作用增强有利于产物结构的稳定。另外，本文以各种中孔分子筛作为催化剂载体担载ＺｒＯ２对ＣＯ加氢反应进行了初步研究，就产物的分布情况和ＺｒＯ２／ＺＳＭ５，ＺｒＯ２／β沸石，ＺｒＯ２／ＨＹ上作了对比。结果表明用中孔分子筛作载体的催化剂和小孔分子筛系列相比对Ｃ＝２～Ｃ＝４有较高的选择性。

Different mesoporous molecular sieves, MCM41, AlMCM41, HMS etc are prepared under different conditions The specific surface areas are measured by using BET method The structures are characterized with XRD, SEM, etc The influences of synthesis conditions on the structures of mesoporous molecular sieves are described The mesoporous molecular sieves are used as supports for catalysts in the hydrogenation of CO The activity and selectivity to C 1￣C 4 hydrocarbons of these catalysts are studied and compared with that of ZrO 2/ZSM5,ZrO 2/β and ZrO 2/HY Because of the higher surface area and special pore structure of MCM41, Zirconia supported on MCM41 prepared under different conditions has higher selectivity to C = 2￣C = 4 for CO hydrogenation than that of ZrO 2/ZSM5, ZrO 2/β and ZrO 2/HY