| 李新生,张慧.Ru—Co—Mo／Al2O3还原催化剂：CO和NO吸附的红外光谱研究[J].分子催化,1992,(4):241-247 |
| Ru—Co—Mo／Al2O3还原催化剂：CO和NO吸附的红外光谱研究 |
| Reduced Ru-Co-Mo/Al2O3 Catalysts for Hydrodesulfurization: Infrared Spectroscopic Study of CO and NO Coadsorption |
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| DOI： |
| 中文关键词: 金属 催化剂 表征 一氧化碳 吸附 |
| 英文关键词:Metal catalyst , Catalyst characterization , Carbon monoxide , Nitrogen oxide , Adsorption., |
| 基金项目: |
| 李新生 张慧 |
| 中国科学院大连化学物理研究所催化基础研究国家实验室，中国科学院大连化学物理研究所催化基础研究国家实验室，中国科学院大连化学物理研究所催化基础研究国家实验室，中国科学院大连化学物理研究所催化基础研究国家实验室 大连 116023，大连 116023，大连 116023，大连 116023 |
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| 中文摘要: |
| 本文采用CO、NO作为探针分子,应用红外光谱法对其在还原态Mo/Al_2O_3,Co-Mo/Al_2O_3,Ru-Mo/Al_2O_3,Ru-Co-Mo/Al_2O_3系列催化剂上的吸附态进行了表征。CO和NO在Mo,Co,Ru中心上的吸附峰随着它们的担载量增加而增强。Co和Ru作为助剂对Mo中心的吸附能力产生显著不同的影响,增加Co担载量大大减少了Mo中心的吸附NO量,并且NO在Co中心上的吸附红外谱带1775,1860 cm~(-1)位移到1800,1879 cm~(-1);而增加Ru担载量则加强了CO和NO在Mo中心上的吸附量,并使得NO在Mo中心上的吸附红外谱带1706,1812 cm~(-1)红移至1679,1801 cm~(-1)。根据实验结果,本文分别对Co和Ru的助剂功能进行了讨论。 |
| 英文摘要: |
| Infrared spectra of CO and NO adsorbed on reduced Co-Mo/Al2O3, Ru-Mo/Al2O3, Ru-Co-Mo/ Al2O3 catalysts have been studied. CO adsorption on reduced Mo sites gave rise to a peak at 2184cm-1, and shifted to 2137 cm-1 when coadsorbed with NO. NO adsorbed on reduced Mo sites showed twin peaks at 1706 cm-1 and 1812 cm-1. Adsorbed CO on Co/Al2O3 appeared at 2180 cm-1 and 2052-2060 cm-1 corresponding to Co2+ and Co0 respectively. The adsorbed CO on Co sites could be displaced by NO when NO was introduced into the IR cell.
From a comparison of the spectra of CO and NO adsorbed on Co-Mo/Al2O3 with that on Mo/ Al2O3, it was seen that the intensities of CO and NO adsorbed on Mo of Co-Mo/Al2O3 decreased, which indicates that part of cobalt ions located on the coordinatively unsaturated Mo sites. Furthermore, the bands of NO adsorbed on Co sites in Co-Mo/Al2O3 catalyst shifted from 1775 cm-1 and 1860 cm-1 to 1800 cm-1 and 1879 cm-1 respectively by comparing with Co/Al2O3. From these facts it is suggested that cobalt interacted chemically with molybdenum to form a CoMo mixed phase.
On Ru-Mo/Al2O3 and Ru- Co- Mo/ Al2O3 catalysts, the function of ruthenium was found to increase the adsorption of CO and NO on Mo sites, and the bands of NO adsorbed on Mo sites shifted from 1706 cm-1 and 1812 cm-1 to 1679 cm-1and 1801 cm-1 respectively. It was observed that the intensities of CO and NO bands of Mo sites were strenghened following the increase of Ru loading. These facts indicate that Ru enhanced the reduction of Mo sites to produce more coordinatively unsaturated Mo centers. However, the influence of Ru on cobalt to adsorb CO and NO was not apparent. Based on the above evidences, the promoting effect of Ru is proposed to be effected by the activation of hydrogen on the Ru centers, and the spill-over of the activated hydrogen onto the Mo sites to take part in the reduction of Mo sites. |
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