硅烷化处理的纳米ZSM-5的结构表征及催化性能

催化学报 , 2007, 28(7): 617-621.

硅烷化处理的纳米ZSM-5的结构表征及催化性能

王坤院 ^1, , 王祥生 ^2, , 李钢 ^3, , 龙化云 ^4,

1.大连理工大学催化化学与工程系精细化工国家重点实验室,辽宁大连,116012

2.大连理工大学催化化学与工程系精细化工国家重点实验室,辽宁大连,116012

3.大连理工大学催化化学与工程系精细化工国家重点实验室,辽宁大连,116012

4.大连理工大学催化化学与工程系精细化工国家重点实验室,辽宁大连,116012

基金项目: 国家重点基础研究发展计划(973计划)(2005CB;221405)

关键词：纳米ZSM-5沸石 , 硅烷化 , 甲苯 , 歧化

Characterization and Catalytic Activity of Silylated Nanoscale ZSM-5

采用多次浸渍法和化学反应沉积法对纳米HZSM-5分子筛外表面进行了硅烷化处理,考察了改性后纳米ZSM-5对甲苯歧化的催化活性. 采用改进的Hammett指示剂法和吡啶吸附红外光谱研究了催化剂的酸性位,采用X射线衍射和29Si MAS NMR对催化剂的结构进行了表征. 研究结果表明,硅烷化处理降低了纳米ZSM-5酸性位的浓度,从而降低了纳米ZSM-5的催化活性. 硅烷化处理还减少了纳米ZSM-5中Si的Q4物种,降低了纳米ZSM-5的相对结晶度,同时硅烷化处理产生了脱铝作用. 骨架铝含量的减少导致催化剂的酸性位减少,催化活性降低.

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材料期刊网

硅烷化处理的纳米ZSM-5的结构表征及催化性能

Characterization and Catalytic Activity of Silylated Nanoscale ZSM-5

参考文献