SiO2改性MCM-22分子筛上联苯与环己醇的择形烷基化反应

doi:10.3866/PKU.WHXB201705251

物理化学学报 >> 2017, Vol. 33 >> Issue (11): 2277-2283.doi: 10.3866/PKU.WHXB201705251

SiO₂改性MCM-22分子筛上联苯与环己醇的择形烷基化反应

王跃桦,王俊杰,梁金花*(),王俊格,成静,丁中协,刘振,任晓乾*()

南京工业大学化工学院,南京210009

收稿日期:2017-01-19 发布日期:2017-08-25
通讯作者: 梁金花,任晓乾 E-mail:Lianhjh@njtech.edu.cn;xqren@njtech.edu.cn
基金资助:
江苏高校品牌专业建设工程资助项目

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

Yue-Hua WANG,Jun-Jie WANG,Jin-Hua LIANG*(),Jun-Ge WANG,Jing CHENG,Zhong-Xie DING,Zhen LIU,Xiao-Qian REN*()

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

Received:2017-01-19 Published:2017-08-25
Contact: Jin-Hua LIANG,Xiao-Qian REN E-mail:Lianhjh@njtech.edu.cn;xqren@njtech.edu.cn
Supported by:
Top-notch Academic Programs of Jiangsu Higher Education Institutions, China

摘要/Abstract

摘要：

以正硅酸四乙酯（TEOS）为修饰剂，采用化学液相沉积法（CLD）对MCM-22分子筛进行改性，制备了一系列SiO₂改性的MCM-22催化剂。采用X射线衍射（XRD）、N₂物理吸附-脱附、氨程序升温脱附（NH₃-TPD）、吡啶吸附红外光谱（Py-IR）对催化剂性质进行了表征。结果表明SiO₂主要沉积在MCM-22分子筛的外表面，外表面上的Br?nsted酸位量明显减少，但对分子筛的总酸量影响不大。考察了改性催化剂用于联苯与环己醇的择形烷基化反应制备线性4-环己基联苯（4-CBP）及4，4'-环己基联苯（4，4'-DCBP）的催化性能。在常压条件下，温度为190℃时反应200 min，4-CBP与4，4'-DCBP的选择性分别为80.4%与63.7%。结合表征数据，发现SiO₂沉积对发生在催化剂外表面Br?nsted酸位上的异构化反应有明显的抑制作用。此外，重复使用5次后的改性分子筛经过焙烧复原，活性与选择性基本恢复。

关键词: 联苯, 择形烷基化, MCM-22, 环己基联苯, 化学液相沉积

Abstract:

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 Br?nsted 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 Br?nsted acid sites were diminished effectively. In addition, the catalytic activity of the used zeolites was almost recovered by calcination.

Key words: Biphenyl, Shape-selective alkylation, MCM-22, Cyclohexyl biphenyl, Chemical liquid deposition

王跃桦,王俊杰,梁金花,王俊格,成静,丁中协,刘振,任晓乾. SiO₂改性MCM-22分子筛上联苯与环己醇的择形烷基化反应[J]. 物理化学学报, 2017, 33(11), 2277-2283. doi: 10.3866/PKU.WHXB201705251

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

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201705251

https://www.whxb.pku.edu.cn/CN/Y2017/V33/I11/2277

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SiO₂改性MCM-22分子筛上联苯与环己醇的择形烷基化反应

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

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