期刊
CHINESE JOURNAL OF CATALYSIS
卷 31, 期 10, 页码 1209-1216出版社
SCIENCE PRESS
DOI: 10.1016/S1872-2067(10)60113-1
关键词
methanol; toluene; alkylation; platinum; hydrofluorination; shape-selectivity; ZSM-5
Toluene was alkylated with methanol in a flow type reactor at temperatures between 300 and 500 degrees C using H-ZSM-5 zeolite, 0.2%Pt/H-ZSM-5 and hydrofluorinated 0.2%Pt/H-ZSM-5 with HF concentrations of 1.0%, 2.0%, 3.0%, or 4.0%. Pt primarily enhances toluene conversion, total xylenes production, and p-xylene relative to its thermodynamic equilibrium. As the concentration of HF increases from 1.0% to 3.0%, the catalyst activity increases because of the increase in the number of acid sites and their strength. Additionally, the surface area and Pt dispersion also increases. An advantage of increased HF doping is that the formation of voluminous trimethylbenzene (TMB) byproducts is inhibited. However, at a HF concentration of 4.0%, Al and Si are partially leached and then deposited mostly in the wider catalytic pores. This was determined by evaluating the pore volume distribution and we determined that reactivity inhibition was obviously present and was due to diffusion restriction.
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