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

文献类型：期刊论文

作者Xin, Qin3; Lin, Long1,2; Zhang, Xiaotong1,2; He, Ning1,2; Liu, Jiaxu1,2; Guo, Hongchen1,2
刊名CATALYSTS
出版日期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
DOI10.3390/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.
WOS关键词BECKMANN REARRANGEMENT ; SILICALITE CHARACTERIZATION ; IR SPECTROSCOPY ; ACTIVE-SITES ; PROPANE ; METHANOL ; DEACTIVATION ; CAPACITY ; BETA ; MFI
资助项目National Natural Science Foundation of China[21603023] ; NSFC-Liaoning Province[U1508205]
WOS研究方向Chemistry
语种英语
WOS记录号WOS:000459732000099
出版者MDPI
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
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.

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来源：大连化学物理研究所

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