Abstract
Abstract 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 Bronsted 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 Bronsted 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%).
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