Cuihua Xuebao/Chinese Journal of Catalysis p. 1530 - 1537 (2016)
Update date:2022-08-22
Topics:
Wang, Meixia
Huang, Shouying
Lü, Jing
Cheng, Zaizhe
Li, Ying
Wang, Shengping
Ma, Xinbin
Among the reactions catalyzed by zeolites there are some that exhibit high selectivity due to the spatial confinement effect of the zeolite framework. Tailoring the acidity, particularly the distribution and location of the Br?nsted acid sites in the zeolite is effective for making it a better catalyst for these reactions. We prepared a series of H-mordenite (H-MOR) samples by varying the composition of the sol-gel, using different structure directing agents and post-treatment. NH3-TPD and IR characterization of adsorbed pyridine were employed to determine the amount of Br?nsted acid sites in the 8-membered ring and 12-membered ring channels. It was shown that controlled synthesis was a promising approach to improve the concentration of Br?nsted acid sites in MOR, even with a low Al content. Using an appropriate composition of Si and Al in the sol-gel favored a higher proportion of Br?nsted acid sites in the 8-membered ring channels. HMI as a structure-direct agent gave an obvious enrichment of Br?nsted acid sites in the 8-membered ring. Carbonylation of dimethyl ether was used as a probe reaction to examine the modification of the acid properties, especially the Br?nsted acid sites in the 8-membered ring channels. There was a linear relationship between methyl acetate formation and the number of Br?nsted acid sites in the 8-membered ring channels, demonstrating the successful modification of acid properties. Our results provide information for the rational design and modification of zeolites with spatial constraints.
View MoreJiangsu Institute of Ecomones Co., Ltd
website:http://www.jsmone.com
Contact:+86-519-82821700
Address:95 Huanyuan N. Road, Jintan, Jiangsu, China
Shanghai Rich Chemicals Co., Ltd
website:http://www.richchemical.com
Contact:+86-21-20255798
Address:Pudong Shanghai,China
Shanghai Bocimed Pharmaceutical Co., Ltd.
website:http://www.bocimed.com
Contact:+86-21-68861632
Address:Building 1, Lane 647, Songtao Road, Zhangjiang High-Tech Park, Shanghai
Contact:+86-371-86058576
Address:NO.32, Jingsan Road, Zhengzhou, China
HANGZHOU FOREWIN PHARMA CO., LTD
Contact:+86-571-89053961
Address:hangzhou
Doi:10.1021/ja01350a043
(1932)Doi:10.1016/j.jfluchem.2004.09.003
(2004)Doi:10.1007/s12039-013-0500-0
(2013)Doi:10.1021/jo980093r
(1998)Doi:10.1021/ja00893a008
(1963)Doi:10.1021/acs.organomet.5b00939
(2016)