当前位置: X-MOL 学术Micropor. Mesopor. Mater. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Improved performance of mesoporous HZSM-5 designed with selective deactivation of external surface acidity in the isomerization of styrene oxide
Microporous and Mesoporous Materials ( IF 5.2 ) Pub Date : 2020-01-25 , DOI: 10.1016/j.micromeso.2020.110037
Ming-Lei Gou , Junqing Cai , Wensheng Song , Yonghua Duan , Zhen Liu , Qingshan Niu

A series of mesoporous HZSM-5 designed by phosphorous modification with or without hexadecyltrimethylammonium bromide (CTAB) pretreatment were prepared and tested in the isomerization of styrene oxide. CTAB pretreatment changed the external surface properties of mesoporous HZSM-5 with positive charged, which could selectively adsorb the phosphate anions and deactivate the external Brønsted acid sites caused by a framework dealumination during calcinations. The phosphate species on the external surface could not migrate into the micropores. There were only a few phosphate species formed in the micropores and most of the internal Brønsted acid sites were preserved. External surface deactivation whilst retaining the hierarchical pore structure of mesoporous HZSM-5 was achieved by phosphorous modification with CTAB pretreatment, thus providing a potential industrial application catalyst which remarkably improves the catalytic stability (lifetime 59.8 h) while preserving the high activity (>99%) and selectivity (>96%).



中文翻译:

通过选择性减活苯乙烯氧化物异构化中的外表面酸度而设计的介孔HZSM-5的改进性能

制备了一系列介孔HZSM-5,通过对磷进行改性,设计有无十六烷基三甲基溴化铵(CTAB)预处理,并在氧化苯乙烯的异构化中进行了测试。CTAB预处理改变了带正电荷的中孔HZSM-5的外表面性能,可以选择性地吸附磷酸根阴离子并使在煅烧过程中骨架脱铝引起的外部布朗斯台德酸位失活。外表面上的磷酸盐物质不能迁移到微孔中。在微孔中仅形成了少量磷酸盐,大多数内部布朗斯台德酸位点得以保留。通过CTAB预处理对磷进行改性,可在保持介孔HZSM-5的层级孔隙结构的同时使外表面失活,

更新日期:2020-01-26
down
wechat
bug