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

doi:10.1007/s10562-006-0004-3

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

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

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 (B_T/L_T) 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 B_T/L_T.

Original language	English (US)
Pages (from-to)	209-214
Number of pages	6
Journal	Catalysis Letters
Volume	107
Issue number	3-4
DOIs	https://doi.org/10.1007/s10562-006-0004-3
State	Published - Mar 2006

All Science Journal Classification (ASJC) codes

Catalysis
Chemistry(all)

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10.1007/s10562-006-0004-3

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title = "Influence of calcination temperature on the stability of fluorinated nanosized HZSM-5 in the methylation of biphenyl",

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 Br{\"o}nsted 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.",

author = "Yanan Wang and Xinwen Guo and Chen Zhang and Fengling Song and Xiangsheng Wang and Liu, {Hai Ou} and Xiaochun Xu and Chunshan Song and Weiping Zhang and Xiumei Liu and Xiuwen Han and Xinhe Bao",

year = "2006",

month = mar,

doi = "10.1007/s10562-006-0004-3",

language = "English (US)",

volume = "107",

pages = "209--214",

journal = "Catalysis Letters",

issn = "1011-372X",

publisher = "Springer Netherlands",

number = "3-4",

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TY - JOUR

T1 - Influence of calcination temperature on the stability of fluorinated nanosized HZSM-5 in the methylation of biphenyl

AU - Wang, Yanan

AU - Guo, Xinwen

AU - Zhang, Chen

AU - Song, Fengling

AU - Wang, Xiangsheng

AU - Liu, Hai Ou

AU - Xu, Xiaochun

AU - Song, Chunshan

AU - Zhang, Weiping

AU - Liu, Xiumei

AU - Han, Xiuwen

AU - Bao, Xinhe

PY - 2006/3

Y1 - 2006/3

N2 - 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.

AB - 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.

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

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