Volume 44 Issue 6
Jun.  2016
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LV Jiang-jiang, HUANG Xing-liang, ZHAO Lei-lei, SUN Ren-shan, HU Long-wang, GONG Yan. Effects of acid-alkali treatment on properties and reactivity of ZSM-5 catalyst[J]. Journal of Fuel Chemistry and Technology, 2016, 44(6): 732-737.
Citation: LV Jiang-jiang, HUANG Xing-liang, ZHAO Lei-lei, SUN Ren-shan, HU Long-wang, GONG Yan. Effects of acid-alkali treatment on properties and reactivity of ZSM-5 catalyst[J]. Journal of Fuel Chemistry and Technology, 2016, 44(6): 732-737.

Effects of acid-alkali treatment on properties and reactivity of ZSM-5 catalyst

More Information
  • Corresponding author: Tel: 010-89734155, E-mail: xihuang@cup.edu.cn
  • Received Date: 2015-12-02
  • Rev Recd Date: 2016-03-29
  • Available Online: 2021-01-23
  • Publish Date: 2016-06-10
  • The effects of alkali-treatment and alkali-acid-treatment of ZSM-5 on the catalytic properties and catalytic performance of benzene alkylation with methanol were studied. The results showed that alkali treatment of ZSM-5 can remove the extra-framework Si species to enhance the diffusivity. However, it can also neutralize the strong acid sites of ZSM-5 and weaken the activation of methanol, reducing the reactivity of benzene alkylation with methanol. The twice acid treatment of alkali-treated ZSM-5 improve the catalytic performance because it can not only remove the extra-framework Al species, but also restore a part of strong acid sites neutralized in the process of alkali-treatment. Further research on the effects of alkalinity showed that the extra-framework Al species and Si species can be removed and a moderate particle size can be obtained after treatment of ZSM-5 with a moderate concentration of alkali. Moreover, the carbon deposition rate has been slowed down due to a decrease of strong acid sites. Therefore, the conversion of benzene can be improved by more than 15%.
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