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OALib Journal期刊
ISSN: 2333-9721
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ga改性zsm-5分子筛催化丙烷芳构化性能研究
, PP. 961-969
Keywords: 丙烷芳构化,si/al比,ga物种,zsm-5分子筛,氧化还原预处理
Abstract:
？用离子交换法制备ga改性zsm-5双功能催化剂,并结合xrd、sem、bet、nh3-tpd、py-ir及icp、xps等多种技术进行表征,考察分子筛硅铝比(si/al)和催化剂氧化还原预处理条件对分子筛的酸性质、ga物种的存在状态及其丙烷芳构化催化性能的影响。研究表明,硅铝比不仅可以改变分子筛的酸性,也会影响分子筛中非骨架ga物种与分子筛表面的相互作用程度,进而影响含ga分子筛的丙烷芳构化性能。在质量空速1.0h-1、反应温度550℃下,si/al比为30的ga-hzsm-5分子筛丙烷转化率和芳烃收率最高。ga物种的引入可以提高丙烷的转化率和芳烃的选择性,并抑制烷烃、烯烃的裂解。h2还原处理,将分子筛表面ga2o3还原为低价的ga+和gah+2物种,促进了ga物种向分子筛微孔迁移;还原-氧化处理后,ga+和gah+2物种氧化成gao+,占据分子筛孔道离子交换位,显著提高了催化剂的芳构化活性。
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