期刊
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
卷 58, 期 24, 页码 10154-10163出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.9b00629
关键词
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资金
- National Science Foundation for Young Scientists of China [21706065]
- Open Project of State Key Laboratory of Chemical Engineering of East China University of Science and Technology [SKL-ChE-18C02]
- Shanghai Sailing Program [18YF1406300]
- China Postdoctoral Science Foundation [2017M621389]
A phosphorus modified HZSM-5 sample with excellent p-xylene selectivity was successfully obtained by a method of reversing the external surface ZSM-5 crystals to positive charged by HDTMA, which could selectively deposit the phosphorus on the external surface and pore entrance. The texture properties were characterized by XRD, XRF and N-2 adsorption-desorption. The accessibility of acid sites was determined by NH3-TPD and Py/Coll-IR. The solid-state NMR measurement indicated that more phosphorus did not enter the pores of the MZS-1.5P sample and existed as H4P2O7 or polyphosphates not connected to aluminum. Applied to alkylation of toluene with methanol, MZS-1.5P sample all exhibited excellent para-selectivity at reaction temperatures of 360-420 degrees C and WHSV of 1.0-4.0 h(-1). The TPD of xylene analysis showed that the interactions between diffusing molecule and surface of ZSM-5 as well as the geometric factors play important roles in the diffusion process.
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