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| 由分子筛笼内铂羰基簇合物得到的催化剂的分散度研究 | |
| 引用本文： | 李光进,杨亚书,郭燮贤,市川胜. 由分子筛笼内铂羰基簇合物得到的催化剂的分散度研究[J]. 物理化学学报, 1994, 10(6): 549-554. DOI: 10.3866/PKU.WHXB19940613 |
| 作者姓名： | 李光进 杨亚书 郭燮贤 市川胜 |
| 作者单位： | State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Catalysis Research Center, Hokkaido University, Sapporo 060 Japan |
| 摘 要： | 由分子筛笼内包容的铂羰基簇合物[Pt_(12)(CO)_(24)]~(2-)/NaY和[Pt_9(CO)_(18)]~(2-)/NaY经还原得到的样品Pt_(12)/NaY和Pi_9/NaY的分散度用EXAFS和化学吸附进行了表征．对Pt_(12)/NaY和Pi_9/NaY，EXAFS分析分别给出R_(Pt－Pt)＝0.274 nm，配位数C.N.＝0.42和R_(Pt－Pt)＝0.274 nm配位数C.N.＝3.8，而化学吸附结果分别为H/Pt＝1.26，CO/Pt＝0.69和H/Pt＝1.24，CO/Pt＝0.64．与浸渍法制备的Pt/Al_2O_3相比小得多的Pt－Pt配位数及大的化学吸附值说明，由分子筛笼内铂羰基簇合物出发，我们得到了高分散的Pt/NaY催化剂．由于还原后原子堆积形式的变化，Pt_(12)/NaY和Pt_9/NaY的再还原羰基化不能可逆地得到与前驱体相同的铂羰基簇合物． |
| 关 键 词： | 分子筛 铂 羰基簇合物 分散度 |
| 收稿时间： | 1992-12-12 |
| 修稿时间： | 1993-09-20 |
Dispersion of Catalysts Derived from Intrazeolite Pt Carbonyl Clusters |
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| Li Guangjin,Yang Yashu,Guo Xiexian. Dispersion of Catalysts Derived from Intrazeolite Pt Carbonyl Clusters[J]. Acta Physico-Chimica Sinica, 1994, 10(6): 549-554. DOI: 10.3866/PKU.WHXB19940613 | |
| Authors: | Li Guangjin Yang Yashu Guo Xiexian |
| Affiliation: | State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023| Catalysis Research Center, Hokkaido University, Sapporo 060 Japan |
| Abstract: | The catalysts derived from the reduction of intrazeolite Pt carbonyl clusters [Pt(12)(CO)(24)](2-)/NaY and [Pt9(CO)(18)](2-)/NaY were characterized by EXAFS and chemisorption techniques. EXAFS analysis gave R(Pt-Pt)=2.74, C.N.=4.2 for Pt(12)/NaY and R(Pt-Pt)=2.74, C.N.=3.8 for Pt9/NaY, whil the chemisorption of H2 and CO gave H/Pt=1.26, CO/Pt=0.69 and H/Pt=1.24, CO/Pt=0.64 for Pt(12)/NaY and Pt9/NaY respectively. Compared with the results of Pt/Al2O3, it is concluded that highly dispersed Pt/NaY catalysts were derived from the intrazeolie Pt carbonyl clusters. Because of the structureal changes of reduced Pt carbonyl clusters, the recarbonylation of Pt12/NaY and Pt9/NaY can not regenerate the same Pt carbonyl clusters as their precursors. |
| Keywords: | Zeolites Pt Carbonyl clusters Dispersion |
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