Explaining the influence of the introduced base sites into alkali oxide modified CsX towards side-chain alkylation of toluene with methanol

doi:10.1039/c9ra01798d

	Explaining the influence of the introduced base sites into alkali oxide modified CsX towards side-chain alkylation of toluene with methanol
	Guo, Hongchen 1; Li, Peidong 1,2,3; Han, Qiao 1,2,3; Zhang, Xiaomin 2; Yuan, Yangyang 2; Zhang, Yanfei 1,2,3; Xu, Li 2; Xu, Lei 2
刊名	RSC ADVANCES
	2019
卷号	9 期号:23 页码:13234-13242
ISSN号	2046-2069
DOI	10.1039/c9ra01798d
通讯作者	Guo, Hongchen(hongchenguo@dlut.edu.cn) ; Xu, Lei(leixu@dicp.ac.cn)
英文摘要	The effect of the introduced base sites in CsX with alkali oxide modification towards side-chain alkylation of toluene with methanol was systematically investigated in the present work. A series of alkali oxide modified CsX with a base properties (base strength and amount) gradient were prepared by impregnating CsX with alkali metal hydroxide. Here, CsX with different base strengths were selected as the parent zeolite, which is favorable to clarify the different types of base site in the modified CsX. The base properties of the samples were elucidated based on the CO2-TPD results as well as with characterization by XPS and FT-IR of adsorbed CO2. It was revealed that the base strength of the oxygen atoms with negative charge (O-) in the zeolite framework can be strengthened by the electron donating function of the alkali oxides in the supercage of CsX. Detailed analysis of the correlation between the reaction behaviors of side-chain alkylation reaction and the base properties of the indicated catalysts was carried out. It was found that the dehydrogenation of methanol to formaldehyde step was promoted by the increasing base properties of O- in the CsX framework and that was the main reason for the promotion of the whole side-chain alkylation reaction. However, it was also found that the stronger base properties of the alkali oxide modified CsX would enhance the formation of active hydrogen atoms, which aggravated the unwanted styrene conversion to ethylbenzene.
资助项目	National Natural Science Foundation of China[21576252]
WOS关键词	ZEOLITE-X ; FAUJASITE ZEOLITES ; CESIUM ; ADSORPTION ; CATALYSTS ; FRAMEWORK ; ELECTRONEGATIVITY ; EXCHANGE ; BASICITY ; ISOMERIZATION
WOS研究方向	Chemistry
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000468636000052
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/171895]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
通讯作者	Guo, Hongchen; Xu, Lei
作者单位	1.Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China 2.Chinese Acad Sci, Dalian Inst Chem Phys, Natl Lab Clean Energy, Dalian 116023, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Guo, Hongchen,Li, Peidong,Han, Qiao,et al. Explaining the influence of the introduced base sites into alkali oxide modified CsX towards side-chain alkylation of toluene with methanol[J]. RSC ADVANCES,2019,9(23):13234-13242.
APA	Guo, Hongchen.,Li, Peidong.,Han, Qiao.,Zhang, Xiaomin.,Yuan, Yangyang.,...&Xu, Lei.(2019).Explaining the influence of the introduced base sites into alkali oxide modified CsX towards side-chain alkylation of toluene with methanol.RSC ADVANCES,9(23),13234-13242.
MLA	Guo, Hongchen,et al."Explaining the influence of the introduced base sites into alkali oxide modified CsX towards side-chain alkylation of toluene with methanol".RSC ADVANCES 9.23(2019):13234-13242.