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Reaction pathway for partial hydrogenation of 1,3-butadiene over Pt/SiO2
Hu, Chaoquan1; Sun, Jiahan1; Yang, Yafeng1; Zhu, Qingshan1; Yu, Bin2
2017-12-21
Source PublicationCATALYSIS SCIENCE & TECHNOLOGY
ISSN2044-4753
Volume7Issue:4Pages:5932-5943
Abstract

The reaction pathway for partial hydrogenation of 1,3-butadiene over a Pt/SiO2 catalyst was explored with a combination of in situ diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, intrinsic kinetics, and density functional theory (DFT) calculations. Under the present experimental conditions, the catalyst displayed a nearly constant product composition with similar to 97% selectivity to butenes. In situ DRIFT characterization revealed that the 1-buten-3-yl radical (1B3R), generated from the addition of one hydrogen atom to a terminal carbon of 1,3-butadiene, was the dominant intermediate in the partial hydrogenation of 1,3-butadiene. Kinetic analysis showed that the hydrogenation of 1B3R was the rate-determining step in the formation of butenes. Based on the above experimental results, DFT calculations were employed to investigate the reaction pathway with 1B3R as the intermediate on a Pt(111) surface. Interestingly, it was found that 1B3R can be easily formed from the hydrogenation of 1,3-butadiene with a di-s configuration rather than the most stable tetra-s structure on the Pt(111) surface. This hydrogenation step occurs between the non-coordinated terminal carbon and a hydrogen atom on a top site with an energy barrier of 23.2 kJ mol(-1). The second hydrogenation step from 1B3R to butenes requires relatively higher activation barriers to proceed, being consistent with the experimental kinetics. Finally, the selectivity order for butenes and the structure sensitivity of Pt-catalyzed partial hydrogenation of 1,3-butadiene were discussed.

SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1039/c7cy01882g
Indexed BySCI
Language英语
WOS KeywordSelective Hydrogenation ; Vibrational Spectroscopy ; Infrared-spectroscopy ; Catalysts ; Pt(111) ; Surfaces ; Butadiene ; Dft ; Adsorption ; Chemistry
WOS Research AreaChemistry
WOS SubjectChemistry, Physical
Funding OrganizationNational Natural Science Foundation of China (NFSC)(21606236) ; Center for Mesoscience, Institute of Process Engineering (IPE), Chinese Academy of Sciences (CAS)(COM2016A001)
WOS IDWOS:000417712800014
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/23477
Collection研究所(批量导入)
Corresponding AuthorHu, Chaoquan; Zhu, Qingshan
Affiliation1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.Shandong CISRI CHALCO Rare Earth Technol Co Ltd, Jining 277600, Shandong, Peoples R China
Recommended Citation
GB/T 7714
Hu, Chaoquan,Sun, Jiahan,Yang, Yafeng,et al. Reaction pathway for partial hydrogenation of 1,3-butadiene over Pt/SiO2[J]. CATALYSIS SCIENCE & TECHNOLOGY,2017,7(4):5932-5943.
APA Hu, Chaoquan,Sun, Jiahan,Yang, Yafeng,Zhu, Qingshan,&Yu, Bin.(2017).Reaction pathway for partial hydrogenation of 1,3-butadiene over Pt/SiO2.CATALYSIS SCIENCE & TECHNOLOGY,7(4),5932-5943.
MLA Hu, Chaoquan,et al."Reaction pathway for partial hydrogenation of 1,3-butadiene over Pt/SiO2".CATALYSIS SCIENCE & TECHNOLOGY 7.4(2017):5932-5943.
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