Positron annihilation characteristics and catalytic performances of poly (vinyl alcohol) intercalated montmorillonite supported Pd0 nanoparticles composites
文献类型：期刊论文
| 作者 | Zhao, Jing; Xu, Mengdie; Shu, Guiqing; Yang, Zhen ; Liu, Qi; Zeng, Minfeng; Qi, Chenze; Cao, Xingzhong; Wang, Baoyi; Cao XZ(曹兴忠)
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| 刊名 | RADIATION PHYSICS AND CHEMISTRY
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| 出版日期 | 2018 |
| 卷号 | 153页码:164-172 |
| 关键词 | Montmorillonite Poly (vinyl alcohol) Positron annihilation Pd catalysis |
| ISSN号 | 0969-806X |
| DOI | 10.1016/j.radphyschem.2018.09.026 |
| 文献子类 | Article |
| 英文摘要 | The microstructure of poly (vinyl alcohol)/ montmorillonite (PVA/MMT) matrices and Pd@PVA/MMT catalytic composite was characterized by positron annihilation spectroscopy (PAS) and other techniques, such as high resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD), thermo-gravimetric analysis (TGA), and X-ray photo electron spectroscopy (XPS). XRD and HR-TEM results showed that 20% was the saturation loading percentage of PVA intercalation into MMT. Ortho-positronium (o-Ps) annihilations were mainly distributed in the interlayer spacing of MMT and/or open spaces (free volume) of PVA. Below the saturation loading percentage of PVA 5 20%), it was found that the o-Ps annihilation lifetime became shorter after the intercalation of PVA chains into MMT layers. With further addition of PVA, the o-Ps annihilation lifetime became longer after the formation of exfoliated structure. The 20%-PVA/MMT matrix has been selected as the platform to further immobilize Pd specie for preparing novel 0.2%-Pd@20%-PVA/MMT catalytic composite. The effects of Pd immobilization on the microstructure of PVA/MMT matrices were also sensitively detected by PAS. The mean size of the micro-defects (from Tao-Eldrup model) increased from 0.28 nm (20%-PVA/MMT) to 0.29 rim (0.2%-Pd2+ @20%-PVA/MMT or 0.2%-Pd-0@20%-PVA/MMT), respectively. This increase in the size of the micro-defects of 20%-PVA/MMT matrix after Pd immobilization was mainly due to the replacement of the inter-molecular hydrogen bodings of PVA chains by the interactions formed between the PVA chains and Pd species. The prepared 0.2%-Pd-0@20%-PVA/MMT catalytic composite showed excellent catalytic efficiency and recyclability in both Heck-type and Sonogashira-type coupling reactions. The correlations between the microstructure and performance of the 0.2%-Pd-0@20%-PVA/MMT composite were thoroughly discussed. |
| WOS关键词 | SILICATE NANOCOMPOSITES ; HETEROGENEOUS CATALYST ; METAL-NANOPARTICLES ; COUPLING REACTIONS ; C-C ; PALLADIUM ; CHITOSAN ; EFFICIENT ; LIFETIME ; PROBE |
| WOS研究方向 | Biochemistry & Molecular Biology ; Endocrinology & Metabolism |
| 语种 | 英语 |
| WOS记录号 | WOS:000452576200023 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/286616]  |
| 专题 | 中国科学院高能物理研究所_中国散裂中子源 高能物理研究所_多学科研究中心 |
| 通讯作者 | Cao XZ(曹兴忠) |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | Zhao, Jing,Xu, Mengdie,Shu, Guiqing,et al. Positron annihilation characteristics and catalytic performances of poly (vinyl alcohol) intercalated montmorillonite supported Pd0 nanoparticles composites[J]. RADIATION PHYSICS AND CHEMISTRY,2018,153:164-172. |
| APA | Zhao, Jing.,Xu, Mengdie.,Shu, Guiqing.,Yang, Zhen.,Liu, Qi.,...&王宝义.(2018).Positron annihilation characteristics and catalytic performances of poly (vinyl alcohol) intercalated montmorillonite supported Pd0 nanoparticles composites.RADIATION PHYSICS AND CHEMISTRY,153,164-172. |
| MLA | Zhao, Jing,et al."Positron annihilation characteristics and catalytic performances of poly (vinyl alcohol) intercalated montmorillonite supported Pd0 nanoparticles composites".RADIATION PHYSICS AND CHEMISTRY 153(2018):164-172. |
入库方式： OAI收割
来源：高能物理研究所
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