Citation: WANG Yue-Hua, WANG Jun-Jie, LIANG Jin-Hua, WANG Jun-Ge, CHENG Jing, DING Zhong-Xie, LIU Zhen, REN Xiao-Qian. Shape-Selective Alkylation of Biphenyl with Cyclohexanol over MCM-22 Zeolite Catalyst Modified by SiO₂[J]. Acta Physico-Chimica Sinica, ;2017, 33(11): 2277-2283. doi: 10.3866/PKU.WHXB201705251 shu

Shape-Selective Alkylation of Biphenyl with Cyclohexanol over MCM-22 Zeolite Catalyst Modified by SiO₂

College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, P. R. China

Received Date: 19 January 2017
Revised Date: 18 May 2017

Fund Project: The project was supported by the Top-notch Academic Programs of Jiangsu Higher Education Institutions, China.

Shape-selective catalysts for alkylation of biphenyl with cyclohexanol were prepared by modification of MCM-22 zeolite using chemical liquid deposition (CLD) process with tetraethyl orthosilicate (TEOS). The modified MCM-22 catalysts were characterized by X-ray diffraction (XRD), N₂ physical adsorption-desorption, NH₃ temperature-programmed desorption (NH₃-TPD), and adsorbed pyridine infrared spectroscopy (Py-IR). The results showed that SiO₂ was mainly deposited on the external zeolite surfaces, with no significant structural changes observed in the MCM-22 zeolite after modification. The deposited SiO₂ could reduce the number of external Brønsted acid sites of the zeolites, without noticeably reducing the total amount of acid sites. Shape-selective alkylation of biphenyl with cyclohexanol was carried out over the synthesized catalysts. The selectivity of 4-cyclohexylbiphenyl (4-CBP) and 4,4'-cyclohexylbiphenyl (4,4'-DCBP) reached a maximum of 80.4% and 63.7%, respectively, when the reaction was carried out for 200 min at 190℃ under atmospheric pressure. The characterization data indicated that the isomerization reactions at the external Brønsted acid sites were diminished effectively. In addition, the catalytic activity of the used zeolites was almost recovered by calcination.
- Biphenyl,
- Shape-selective alkylation,
- MCM-22,
- Cyclohexyl biphenyl,
- Chemical liquid deposition
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Shape-Selective Alkylation of Biphenyl with Cyclohexanol over MCM-22 Zeolite Catalyst Modified by SiO2

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通讯作者: 陈斌, bchen63@163.com

Shape-Selective Alkylation of Biphenyl with Cyclohexanol over MCM-22 Zeolite Catalyst Modified by SiO₂