Operando Dual Beam FTIR Study of Hydroxyl Groups and Zn Species over Defective HZSM-5 Zeolite Supported Zinc Catalysts

doi:10.3390/catal9010100

	Operando Dual Beam FTIR Study of Hydroxyl Groups and Zn Species over Defective HZSM-5 Zeolite Supported Zinc Catalysts
	Xin, Qin 3; Lin, Long 1,2; Zhang, Xiaotong 1,2; He, Ning 1,2; Liu, Jiaxu 1,2; Guo, Hongchen 1,2
刊名	CATALYSTS
	2019
卷号	9 期号:1 页码:15
关键词	defective ZSM-5 hydroxyl nests Si(OH)Al Zn(C2H5)(2) chemical liquid deposition operando dual beam FT-IR spectroscopy
ISSN号	2073-4344
DOI	10.3390/catal9010100
通讯作者	Liu, Jiaxu(liujiaxu@dlut.edu.cn)
英文摘要	A series of defective ZSM-5 zeolites (similar to 300 nm, SiO2/Al2O3 ratio of 55, 100, 480 and 950) were systematically studied by XRD, SEM, Si-29 MAS NMR, argon physisorption, NH3-TPD and FT-IR technologies. The nature, the amount and the accessibility of the acid sites of defective ZSM-5 zeolites are greatly different from reported ZSM-5 zeolites with a perfect crystal structure. The Bronsted acid sites (Si(OH)Al) with strong acid strength and the Bronsted acid sites (hydroxyl nests) with weak acid strength co-existed over defective ZSM-5 zeolites, which leads to a unique catalytic function. Zn(C2H5)(2) was grafted onto defective ZSM-5 zeolites through the chemical liquid deposition (CLD) method. Interestingly, FT-IR spectroscopic studies found that Zn(C2H5)(2) was preferentially grafted on the hydroxyl nests with weak acid strength rather than the Si(OH)Al groups with strong acid strength over different defective ZSM-5 zeolites. In particular, home-built operando dual beam FTIR-MS was applied to study the catalytic performance of Zn species located in different sites of defective ZSM-5 zeolites under real n-hexane transformation conditions. Results show that Zn species grafted over hydroxyl nests obtain better dehydrogenative aromatization performance than Zn species over Si(OH)Al groups. This study provides guidance for the rational design of highly efficient alkane dehydrogenative aromatization catalysts.
资助项目	National Natural Science Foundation of China[21603023] ; NSFC-Liaoning Province[U1508205]
WOS关键词	BECKMANN REARRANGEMENT ; SILICALITE CHARACTERIZATION ; IR SPECTROSCOPY ; ACTIVE-SITES ; PROPANE ; METHANOL ; DEACTIVATION ; CAPACITY ; BETA ; MFI
WOS研究方向	Chemistry
语种	英语
出版者	MDPI
WOS记录号	WOS:000459732000099
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; NSFC-Liaoning Province ; NSFC-Liaoning Province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; NSFC-Liaoning Province ; NSFC-Liaoning Province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; NSFC-Liaoning Province ; NSFC-Liaoning Province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; NSFC-Liaoning Province ; NSFC-Liaoning Province
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/166028]
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	Liu, Jiaxu
作者单位	1.Dalian Univ Technol, State Key Lab Fine Chem, 2 Linggong Rd, Dalian 116024, Peoples R China 2.Dalian Univ Technol, Sch Chem Engn, 2 Linggong Rd, Dalian 116024, Peoples R China 3.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
推荐引用方式 GB/T 7714	Xin, Qin,Lin, Long,Zhang, Xiaotong,et al. Operando Dual Beam FTIR Study of Hydroxyl Groups and Zn Species over Defective HZSM-5 Zeolite Supported Zinc Catalysts[J]. CATALYSTS,2019,9(1):15.
APA	Xin, Qin,Lin, Long,Zhang, Xiaotong,He, Ning,Liu, Jiaxu,&Guo, Hongchen.(2019).Operando Dual Beam FTIR Study of Hydroxyl Groups and Zn Species over Defective HZSM-5 Zeolite Supported Zinc Catalysts.CATALYSTS,9(1),15.
MLA	Xin, Qin,et al."Operando Dual Beam FTIR Study of Hydroxyl Groups and Zn Species over Defective HZSM-5 Zeolite Supported Zinc Catalysts".CATALYSTS 9.1(2019):15.