Effects of metal modification on the performance of Pt/Beta catalysts for selective ring opening of polycyclic aromatics

被引：0
|
作者：
Ma M. [1 ,2 ]
Zang J. [1 ,2 ]
Yu H. [1 ,2 ]
Fan J. [1 ,2 ]
Guo C. [1 ,2 ]
Jin F. [1 ,2 ]
机构：
[1] CNOOC Tianjin Chemical Research and Design Institute Limited Corporation, Tianjin
[2] Tianjin Refining and Catalytic Technology Engineering Center, Tianjin
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2021年 / 40卷 / 11期
关键词：
Beta zeolite; Bimetallic catalyst; Noble metal catalyst; Polycyclic aromatics; Selective ring opening;
D O I：
10.16085/j.issn.1000-6613.2020-2306
中图分类号：
学科分类号：
摘要：
Beta zeolites were modified by Mg, Ce and Ga metals using ion exchange method, and Pt/Beta bimetallic catalysts were prepared by impregnation method. The physicochemical properties of these catalysts were characterized by XRD, XRF, NH3-TPD, Py-IR, H2-O2, TEM, H2-TPR, H2-TPD and XPS, and their performances on selective ring opening of polycyclic aromatics were investigated. The results showed that the acidities of the Beta zeolites could be regulated by the metal's substitution effects on Brønsted acid and compensation effects on Lewis acid. The strong metal-support interaction (SMSI) was enhanced by metal modification, which could promote the dispersion of platinum and improve the thermal stability of platinum nanoparticles. The migration or delocalization of electron between platinum nanoparticles and supports caused by the strong metal-support interaction (SMSI), could affect the activation and desorption of H2 by platinum nanoparticles. In addition, the active sites of Pt nanoparticles could be selectively poisoned by the modification of Ga. Metal modification had great influence on the catalytic performance of the Pt/Beta catalysts in selective ring opening of methylnaphthalene. The stability of the Pt/Beta catalysts could be significantly improved by the modification of Ga and Ce. Besides, the Pt/Beta catalysts modified by Ga had the best selectivity. © 2021, Chemical Industry Press Co., Ltd. All right reserved.
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页码：6113 / 6120
页数：7
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