Chem. J. Chinese Universities
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DING Chun-Hua, WANG Xiang-Sheng*, GUO Xin-Wen
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Abstract: The change of acidity and pore structure of MCM-22 zeolite catalysts treated by pure steam and ammonia steam(mass fraction, 6%) were studied by means of XRD, NH3-TPD, IR and N2 adsorption. And the catalytic performance of catalysts was investigated via alkylation of toluene with methanol as the probe reaction. The results show that the total acid amount changed indistinctively and strong acid sites increased relatively if the treated temperature was not higher than 400 ℃ even in two different treated media. However, the total acid amount decreased obviously and strong acid sites nearly disappeared as the treated temperature was beyond 500 ℃, and the second pore with different pore sizes formed and average pore diameter enlarged of MCM-22 zeolite catalysts after hydrothermal treatment. The catalytic activity declined as the selectivity of para-xylene and ortho-xylene improved with increasing treated temperature. The acid strength and acid distribution of MCM-22 catalyst treated by pure steam for 5 h were appropriate for alkylation of toluene with methanol, and the catalyst maintained relatively high catalytic activity and processed some para-xylene selectivity(the toluene conversion and para-xylene were 29.22% and 42.16%, respectively).
Key words: MCM-22 zeolite, Hydrothermal treatment, Alkylation of toluene with methanol, para-Xylene
CLC Number:
O643
TrendMD:
DING Chun-Hua, WANG Xiang-Sheng*, GUO Xin-Wen. Effect of Hydrothermal Treatment of MCM-22 Catalyst on the Acidity, Pore Structure and Alkylation Properties of Toluene with Methanol[J]. Chem. J. Chinese Universities, doi: .
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URL: http://www.cjcu.jlu.edu.cn/EN/
http://www.cjcu.jlu.edu.cn/EN/Y2007/V28/I5/922