Post-treatment with ammonium hexafluorosilicate: An effective way to synthesize high silica MCM-22 zeolite
Post-treatment with ammonium hexafluorosilicate: An effective way to synthesize high silica MCM-22 zeolite
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DOI：
10.1016/j.catcom.2005.07.005
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发表时间：
2005-11
影响因子：
3.7
通讯作者：
Xiangxue Zhu;Shenglin Liu;Yueqin Song;Longya Xu
中科院分区：
文献类型：
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作者：
Xiangxue Zhu;Shenglin Liu;Yueqin Song;Longya Xu
六氟硅酸铵（AHFS）是一种有效的MCM-22分子筛脱铝剂，经AHFS处理后，MCM-22分子筛的Si/Al_2比范围大大扩大（SiO_2/Al_2 O_3> 300）。采用XRD、XRF、N2吸附和吡啶-IR等手段对脱铝前后的MCM-22样品进行了表征。将其用于C4烯烃催化裂解制丙烯反应，结果表明，适当脱铝的MCM-22（硅铝比为58）具有更高的活性、更好的稳定性和相似的产物分布。
Ammonium hexafluorosilicate (AHFS) is an effective dealumination reagent for MCM-22 zeolite, and the Si/Al2ratio range of MCM-22 was extended largely (SiO2/Al2O3∼300) by AHFS treatment. The physicochemical properties of the MCM-22 samples before and after dealumination were characterized by XRD, XRF, N2adsorption and pyridine-IR measurements. Also, the samples were used as catalysts in C4alkenes catalytic cracking to propene and the results showed that properly dealuminated MCM-22 (Si/Al2ratio 58) exhibited higher activity, better stability and similar product distribution relative to the parent MCM-22 zeolite.