等级孔β沸石的制备与表征  

Preparation and characterization of hierarchical porous β zeolite

作　　者：范峰[1] 凌凤香[1] 王少军[1] 杨春雁[1] 秦波[1] 

机构地区：[1]中国石化抚顺石油化工研究院,辽宁抚顺113001

出　　处：《工业催化》2012年第7期6-11,共6页Industrial Catalysis

基　　金：中国石油化工股份有限公司项目(YK510037)

摘　　要：对β沸石进行碱处理,得到具有介孔-微孔等级孔结构的β沸石,采用N2吸附-脱附、FT-IR、XRF、NMR、XRD和TEM等手段进行表征。结果表明,碱度、温度和处理时间是β沸石孔结构的主要影响因素,随着碱度、温度和处理时间的增加,介孔比表面积先增加后降低,微孔比表面积和结晶度不断降低,平均孔径不断递增。在碱度0.5 mol·L-1、温度50℃和处理时间5 h条件下,可以得到介孔孔径集中的β沸石。研究发现,介孔的产生是OH-选择性地与沸石晶体中的硅反应,将部分骨架硅脱除而成,并对沸石的微孔结构造成破坏所致。Hierarchical β zeolite with meso-micropore was prepared by alkaline treatment and characterized by N2 adsorption, XRD, FT-IR, NMR, XRF and TEM techniques. The results indicated that mesoporous surface area, microporous surface area, crystallinity and average pore diameter varied with alkalinity, treatment temperature and treatment time. With increasing alkalinity, treatment temperature and treatment time, mesoporous surface area first increased and then declined, microporous surface area and crystallinity declined, and average pore diameter increased. Hierarchical β zeolite with concentrated mesopores was obtained under the following condition ： treatment for 5 h, alkalinity of 0.5· L- 1 , 50℃. Formation of the mesopores in hierarchical β zeolite was due to selective reaction between OH- and silicon in the crystals, which remove some framework and hence destroyed micropore structure in the zeolite.

关 键 词：催化化学 等级孔 Β沸石 介孔结构 碱处理 

分 类 号：TQ426.6[化学工程] O643.36[理学—物理化学]