Insightful understanding of the correlations of the microstructure and catalytic performances of pd@chitosan membrane catalysts studied by positron annihilation spectroscopy
文献类型：期刊论文
| 作者 | Liu, Qi1; Xu, Mengdie1; Zhao, Jing1; Wang, Yudong1; Qi, Chenze1; Zeng, Minfeng1; Xia, Rui2; Cao, Xingzhong2; Wang, Baoyi2 |
| 刊名 | Rsc advances
 |
| 出版日期 | 2018 |
| 卷号 | 8期号:6页码:3225-3236 |
| ISSN号 | 2046-2069 |
| DOI | 10.1039/c7ra12407d |
| 通讯作者 | Zeng, minfeng(zengmf@usx.edu.cn) |
| 英文摘要 | 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. |
| WOS关键词 | SUPPORTED PALLADIUM CATALYST ; CROSS-COUPLING REACTIONS ; FREE-VOLUME ; HIGHLY EFFICIENT ; HETEROGENEOUS CATALYSIS ; SONOGASHIRA REACTIONS ; HYBRID MICROSPHERES ; MODEL COMPOUNDS ; CO2 SEPARATION ; HECK REACTIONS |
| WOS研究方向 | Chemistry |
| WOS类目 | Chemistry, Multidisciplinary |
| 语种 | 英语 |
| WOS记录号 | WOS:000423304700052 |
| 出版者 | ROYAL SOC CHEMISTRY |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2177953 |
| 专题 | 高能物理研究所 |
| 通讯作者 | Zeng, Minfeng |
| 作者单位 | 1.Shaoxing Univ, Zhejiang Key Lab Alternat Technol Fine Chem Proc, Shaoxing 312000, Peoples R China 2.Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Qi,Xu, Mengdie,Zhao, Jing,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, Qi.,Xu, Mengdie.,Zhao, Jing.,Wang, Yudong.,Qi, Chenze.,...&Wang, Baoyi.(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, Qi,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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来源：高能物理研究所
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