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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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炭黑颗粒及氟粒子辅助法合成多级结构MCM-22分子筛及其催化性能
DOI: 10.1016/S1872-2067(12)60711-6, PP. 49-57
Keywords: 甲烷芳构化,MCM-22分子筛,多级孔道,氟路线,催化性能
Abstract:
？以碳黑为第二模板剂在氟离子体系中一步水热合成了多级结构MCM-22分子筛组装体（简称为MCM-22-FC）。考察了碳黑和氟离子对MCM-22分子筛形貌和催化性能的影响。MCM-22-FC分子筛是由大量片状晶体交错生长形成的组装体结构，其中MCM-22的片层结构更薄，在其固有的微孔中存在的晶间孔呈现大孔和介孔的特征。MCM-22-FC负载Mo后得到的Mo/MCM-22-FC催化剂在甲烷无氧芳构化反应（MDA）中提高了苯收率和芳烃选择性，并且提高了催化剂的寿命。通过氨气程序升温脱附（NH3-TPD）表征，吡啶红外（Py-IR）表征，结合热重（TG）分析，得出的结论是Mo/MCM-22-FC在MDA中优越的催化性能是由于氟离子进入到分子筛骨架当中，形成具有拉电子效应的结构单元，从而提高了分子筛的Br？nsted酸量，较多的Br？nsted酸性位将更多的Mo物种迁移至分子筛孔道内部，形成更多的MoCx或MoOxCy活性物种以及更有利于大分子产物扩散的MCM-22薄片层的结构。少量过剩的Br？nsted酸性位在成型后保留在Mo/HMCM-22-FC催化剂活性中心抑制了积碳的形成，也有助于改善芳烃的选择性。
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