Influence of calcination temperature on the stability of fluorinated nanosized HZSM-5 in the methylation of biphenyl

Yanan Wang, Xinwen Guo, Chen Zhang, Fengling Song, Xiangsheng Wang, Hai Ou Liu, Xiaochun Xu, Chunshan Song, Weiping Zhang, Xiumei Liu, Xiuwen Han, Xinhe Bao

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Abstract

A series of fluorinated nanosized HZSM-5 catalysts were prepared by impregnating the zeolite with NH4F solution. The samples were characterized by XRD, XRF, FTIR-Py, TPD, 27Al and 29Si MAS-NMR. The effect of calcination temperature on the structure and acidity was studied in the range of 400-500°C. When the calcination temperature increases, more framework aluminum atoms are removed due to the fluorination. As a result, the number of acid sites and the acid strength decrease, but the ratio of the total Brönsted acid sites to the total Lewis acid sites (BT/LT) increases. The fluorinated nanosized HZSM-5 catalysts exhibit better stability in the methylation of biphenyl (BP) with methanol. Moreover, the stability increases with the increase of the calcination temperature. When the fluorinated nanosized HZSM-5 is calcined at 500°C, the conversion of BP can keep at about 10% for 50h. The enhancement of stability may be due to the decrease of the acid strength and the increase of the ratio of BT/LT.

Original languageEnglish (US)
Pages (from-to)209-214
Number of pages6
JournalCatalysis Letters
Volume107
Issue number3-4
DOIs
StatePublished - Mar 1 2006

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All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Cite this

Wang, Y., Guo, X., Zhang, C., Song, F., Wang, X., Liu, H. O., Xu, X., Song, C., Zhang, W., Liu, X., Han, X., & Bao, X. (2006). Influence of calcination temperature on the stability of fluorinated nanosized HZSM-5 in the methylation of biphenyl. Catalysis Letters, 107(3-4), 209-214. https://doi.org/10.1007/s10562-006-0004-3