| Insightful understanding of the correlations of the microstructure and catalytic performances of Pd@chitosan membrane catalysts studied by positron annihilation spectroscopy | |
Liu, Q; Xu, MD; Zhao, J ; Wang, YD; Qi, CZ; Zeng, MF; Xia, R; Cao, XZ; Wang, BY; Xia R(夏锐); Cao XZ(曹兴忠); Wang BY(王宝义)
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| 2018 | |
| Source Publication | RSC ADVANCES
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| ISSN | 2046-2069 |
| Volume | 8Issue:6Pages:3225-3236 |
| Subtype | Article |
| Abstract | In this study, the catalytic performances of palladium supported on chitosan (Pd@CS) membrane heterogeneous catalysts have been studied from the aspects of free volume by positron annihilation Lifetime spectroscopy (PALS). The results showed that the variation in free volume hole size of the Pd@CS membrane catalyst was closely associated with microstructure evolutions, such as increase of Pd content, valence transition of Pd by reduction treatment, solvent swelling, physical aging during catalyst recycling, and so on. The PALS resuLts showed that both the mean free volume hole size of the Pd@CS membrane in the dry or swollen state (analyzed by the LT program) and its distribution (analyzed by the MELT program) are smaller than the molecue size of the reactants and products in the catalysis reaction. However, the resuLts showed that the Pd@CS membrane catalyst has excellent catalytic activity for the Heck coupling reaction of all the reactants with different molecule size. It was revealed that the molecule transport channels of the Pd@CS membrane catalyst in the reaction at high temperature was through a number of instantaneously connected free volume holes rather than a single free volume hole. This hypothesis was powerfully supported by the catalytic activity assessment resuLts of the CS Layer sealed Pd@CS membrane catalyst. Meanwhile, it was confirmed that the Leaching of Pd nanoparticles of the reused Pd@CS membrane catalyst during the recycling process was also through such instantaneously connected free volume holes. |
| DOI | 10.1039/c7ra12407d |
| WOS Keyword | SUPPORTED PALLADIUM CATALYST ; CROSS-COUPLING REACTIONS ; FREE-VOLUME ; HIGHLY EFFICIENT ; HETEROGENEOUS CATALYSIS ; SONOGASHIRA REACTIONS ; HYBRID MICROSPHERES ; MODEL COMPOUNDS ; CO2 SEPARATION ; HECK REACTIONS |
| Indexed By | SCI ; ADS ; EI |
| Language | 英语 |
| WOS Research Area | Chemistry |
| WOS Subject | Chemistry, Multidisciplinary |
| WOS ID | WOS:000423304700052 |
| EI Accession Number | 20180404678888 |
| ADS Bibcode | 2018RSCAd...8.3225L |
| ADS URL | https://ui.adsabs.harvard.edu/abs/2018RSCAd...8.3225L |
| ADS CITATIONS | https://ui.adsabs.harvard.edu/abs/2018RSCAd...8.3225L/citations |
| Citation statistics |
Cited Times:1 [ADS]
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| Document Type | 期刊论文 |
| Identifier | http://ir.ihep.ac.cn/handle/311005/285565 |
| Collection | 多学科研究中心 实验物理中心 粒子天体物理中心 |
| Corresponding Author | Cao XZ(曹兴忠) |
| Affiliation | 中国科学院高能物理研究所 |
| First Author Affilication | Institute of High Energy |
| Corresponding Author Affilication | Institute of High Energy |
| Recommended Citation GB/T 7714 | Liu, Q,Xu, MD,Zhao, J,et al. Insightful understanding of the correlations of the microstructure and catalytic performances of Pd@chitosan membrane catalysts studied by positron annihilation spectroscopy[J]. RSC ADVANCES,2018,8(6):3225-3236. |
| APA | Liu, Q.,Xu, MD.,Zhao, J.,Wang, YD.,Qi, CZ.,...&王宝义.(2018).Insightful understanding of the correlations of the microstructure and catalytic performances of Pd@chitosan membrane catalysts studied by positron annihilation spectroscopy.RSC ADVANCES,8(6),3225-3236. |
| MLA | Liu, Q,et al."Insightful understanding of the correlations of the microstructure and catalytic performances of Pd@chitosan membrane catalysts studied by positron annihilation spectroscopy".RSC ADVANCES 8.6(2018):3225-3236. |
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