| Effective Au-Au+-Clx/Fe(OH)y catalysts containing Cl- for selective CO oxidations at lower temperatures | |
| Department | 绿色化学与催化研发中心 |
Qiao BT(乔波涛); Deng YQ(邓友全)
| |
| 2006 | |
| Source Publication | Applied Catalysis B: Environmental
 |
| ISSN | 0926-3373 |
| Volume | 66Pages:241-248 |
| Abstract | Supported Au catalysts Au-Au+-Clx/Fe(OH)y (x＜4, y≤3) and Au-Clx/Fe2O3 prepared with co-precipitation without any washing to remove Cl- and without calcining or calcined at 400 ℃ were studied. It was found that the presence of Cl had little impact on the activity over the unwashed and uncalcined catalysts; however, the activity for CO oxidation would be greatly reduced only after Au-Au+-Clx/Fe(OH)y was further calcined at elevated temperatures, such as 400 8C. XPS investigation showed that Au in catalyst without calcining was composed of Au and Au+, while after calcined at 400 8C it reduced to Au0 completely. It also showed that catalysts precipitated at 70 8C could form more Au+ species than that precipitated at room temperatures. Results of XRD and TEM characterizations indicated that without calcining not only the Au nano-particles but also the supports were highly dispersed, while calcined at 400 8C, the Au nano-particles aggregated and the supports changed to lump sinter. Results of UV–vis observation showed that the Fe(NO3)3 and HAuCl4 hydrolyzed partially to form Fe(OH)3 and [AuClx(OH)4 x] (x = 1–3), respectively, at 70 ℃, and such pre-partially hydrolyzed iron and gold species and the possible interaction between them during the hydrolysis may be favorable for the formation of more active precursor and to avoid the formation of Au–Cl bonds. Results of computer simulation showed that the reaction molecular of CO or O2 were more easily adsorbed on Au+ and Au0, but was very difficultly absorbed on Au . It also indicated that when Cl- was adsorbed on Au0, the Au atom would mostly take a negative electric charge, which would restrain the adsorption of the reaction molecular severely and restrain the subsequent reactions while when Cl was adsorbed on Au+ there only a little of the Au atom take negative electric charge, which resulting a little impact on the activity. |
| Keyword | Gold Catalyst Co Oxidation Green Chemistry Preparation Uncalcined Unwashed |
| Subject Area | 物理化学 |
| Funding Organization | the National Natural Science Foundation of China (No. 20173068) |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | 绿色催化课题组 |
| Document Type | 期刊论文 |
| Identifier | http://ir.licp.cn/handle/362003/3669 |
| Collection | 绿色化学研究发展中心 |
| Corresponding Author | Deng YQ(邓友全) |
| Recommended Citation GB/T 7714 | Qiao BT,Deng YQ. Effective Au-Au+-Clx/Fe(OH)y catalysts containing Cl- for selective CO oxidations at lower temperatures[J]. Applied Catalysis B: Environmental,2006,66:241-248. |
| APA | 乔波涛,&邓友全.(2006).Effective Au-Au+-Clx/Fe(OH)y catalysts containing Cl- for selective CO oxidations at lower temperatures.Applied Catalysis B: Environmental,66,241-248. |
| MLA | 乔波涛,et al."Effective Au-Au+-Clx/Fe(OH)y catalysts containing Cl- for selective CO oxidations at lower temperatures".Applied Catalysis B: Environmental 66(2006):241-248. |
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| 乔波涛-Applide.B.pdf（468KB） | 开放获取 | License | View Application Full Text | |||
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