12元环硅铝分子筛酸性及其B酸中心可接近性探究

doi::10.3969/j.issn.1006-396X.2018.04.005

石油化工高等学校学报 ›› 2018, Vol. 31 ›› Issue (04): 27-31.DOI: :10.3969/j.issn.1006-396X.2018.04.005

12元环硅铝分子筛酸性及其B酸中心可接近性探究

魏潘鹏¹,焦健豪¹,王焕^1,2,刘贺¹,孙兆林¹,宋丽娟^1,2

1.辽宁石油化工大学辽宁省石油化工催化科学与技术重点实验室,辽宁抚顺113001; 2.中国石油大学(华东)化学化工学院,山东青岛266426

收稿日期:2017-06-28 修回日期:2017-11-14 出版日期:2018-08-24 发布日期:2018-08-22
通讯作者: :宋丽娟(1962-),女,博士,教授,博士生导师,从事新型催化材料制备及清洁燃料生产方向研究;E-mail:lsong56@ 263.net。
作者简介::魏潘鹏(1990-),男,硕士研究生,从事石油化工催化剂表征方向研究;E-mail:427751998@qq.com。
基金资助:
:国家自然科学基金项目(U1662135)。

The Acidity and Accessibility of Aluminosilicate Zeolites with 12-Ring Channels

Wei Panpeng¹， Jiao Jianhao¹， Wang Huan^1,2， Liu He¹， Sun Zhaolin¹， Song Lijuan^1,2

1.Liaoning Provincial Key Laboratory of Petrochemical Catalytic Science and Technology，Liaoning Shihua University，Fushun Liaoning 113001, China; 2.College of Chemistry & Chemical Engineering,China University of Petroleum (EastChina),Qingdao Shandong 266426,China

Received:2017-06-28 Revised:2017-11-14 Published:2018-08-24 Online:2018-08-22

摘要/Abstract

摘要： 采用原位红外光谱技术,以吡啶(Py)、2,6-二甲基吡啶(DMPy)、2,6-二叔丁基吡啶(DTPy)为探针分子,考察了HY、HMOR、Hβ3种12元环孔道结构分子筛的表面酸性及其孔道内B酸中心的可接近性。结果表明, HY 分子筛表面酸密度最大,存在丰富的强B酸中心、强L酸中心,以及较多的弱B酸中心,而HMOR和Hβ分子筛表面酸密度较低,且主要为强B酸中心和强L酸中心;以孔道内硅铝桥羟基的变化规律计算B酸中心可接近性指数,结果发现,3种分子筛孔道内B酸中心对大分子碱性探针的可接近性顺序为HMOR> Hβ> HY。

关键词: 原位红外光谱, 12元环分子筛, 酸密度, 可接近性, 大分子探针

Abstract: Acidity and accessibility of three commercial zeolites (HY, HMOR, Hβ) were characterized by using in situ FTIR spectroscopy with pyridine (Py), 2,6-dimethylpyridine (DMPy) and 2,6-di-tertbutylpyridine (DTPy) as the probing molecules. The results indicate that the surface acid density of HY molecular sieve is the highest, and there are abundant strong B acid centers, strong L acid centers, and many weak B acid centers. However, the surface acid density of HMOR and Hβ is low, and it is mainly the strong B acid center and the strong L acid center. The accessibility index of B -acid center is calculated by changing the hydroxyl group of Si-Al bridge. The results show that the order of accessibility of macromolecule probes to Br-nsted acid sites in these three type of zeolites is HMOR＞Hβ＞HY.

Key words: In situ FTIR, 12-Ring channels zeolite, Acid site density, Accessibility, Macromolecule probe

魏潘鹏1,焦健豪1,王焕1,2,刘贺1,孙兆林1,宋丽娟1,2. 12元环硅铝分子筛酸性及其B酸中心可接近性探究[J]. 石油化工高等学校学报, 2018, 31(04): 27-31.

Wei Panpeng， Jiao Jianhao， Wang Huan， Liu He， Sun Zhaolin， Song Lijuan. The Acidity and Accessibility of Aluminosilicate Zeolites with 12-Ring Channels[J]. Journal of Petrochemical Universities, 2018, 31(04): 27-31.

12元环硅铝分子筛酸性及其B酸中心可接近性探究

The Acidity and Accessibility of Aluminosilicate Zeolites with 12-Ring Channels

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