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Effect of bismuth species on propylene aromatization over BiHZSM‐5 catalysts
Author(s) -
Miao ChengMing,
Wu ChuanChang,
Feng Lin
Publication year - 1994
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19940120402
Subject(s) - chemistry , aromatization , catalysis , zeolite , acid strength , bismuth , x ray photoelectron spectroscopy , inorganic chemistry , nuclear chemistry , organic chemistry , chemical engineering , engineering
The catalytic behavior of Bi‐impregnated HZSM‐5 zeolites in propylene aromatization and the surface properties of the zeolites were determined by microreactor, XRD, XPS, NH 3 ‐TPD and IR‐TPD. The mechanism of the reaction and the effect of surface properties of the zeolites on the reaction were also investigated. Experimental data showed that Bi‐impregnation made the strength of B‐acid sites decrease, the strength of L‐acid sites and the concentration of both strong B‐acid sites and strong L‐acid sites increase. Bi‐impregnation also induced sub‐strong acid sites. These were the factors that made the aromatic products of the reaction increase. The strong interaction between the impregnant and zeolite surface reached maximum at Bi 2 O 3 = 3.5 wt%. Above this value, covering effect of impregnant caused a decrease of aromatic products.