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, NH3‐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 Bi2O3 = 3.5 wt%. Above this value, covering effect of impregnant caused a decrease of aromatic products.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.