| P123软模板对CuO-CeO2结构及其CO催化氧化性能的影响 |
| Effect of P123 on Structure and CO Catalytic Oxidation Performance of CuO-CeO2 Catalysts |
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| 摘要: 采用软模板水热法制备了不同Cu/Ce物质的量之比的CuO-CeO2(nCu:nCe=1:9、2:8、3:7、4:6、5:5、6:4、7:3)催化剂。考察了nCu:nCe和制备方法(软模板水热法和无模板共沉淀法)对CuO-CeO2催化剂低温催化氧化CO性能的影响,并采用XRD、N2-吸附脱附、TEM、H2-TPR和XPS等表征手段对催化剂的结构、氧化还原特性和表面化学状态等进行了分析。结果表明,随着nCu:nCe的增加,CuO-CeO2催化剂的CO催化氧化活性先升高后降低。当nCu:nCe=5:5时,催化剂在100℃时CO转化率即达到90%以上。采用软模板水热法制备的CuO-CeO2催化剂大的比表面积、狭窄的孔道分布结构、活性CuO物种高的分散状态和CuO与CeO2之间存在强相互作用是其具有优异的CO催化氧化活性的主要原因。 |
| 关键词: 软模板 CuO-CeO2催化剂 CO氧化 |
| 基金项目: 国家自然科学基金(No.21307047、U1137603)资助项目。 |
| Abstract: A series of CuO-CeO2 (nCu:nCe=1:9, 2:8, 3:7, 4:6, 5:5, 6:4, 7:3) catalysts with different Cu/Ce molar ratios (nCu:nCe) were prepared by soft template hydrothermal method. The effect of nCu:nCe and preparation methods (soft template hydrothermal method and co-precipitation without template method) on CO catalytic oxidation performance was investigated, and the structure, reduction features and surface chemical states of the CuO-CeO2 catalysts were characterized by XRD, TEM, low temperature adsorption-desorption, temperature programmed reduction (H2-TPR) and XPS. The results show that with the increase of nCu:nCe, the CO catalytic oxidation activities of CuO-CeO2 catalysts increase firstly and then decrease. When the nCu:nCe is 5:5, the CO catalytic oxidation activity of the catalyst is more than 90% at 100℃. The large specific surface area, narrow pore structure distribution, high dispersion of active CuO species and the strong interaction between CuO and CeO2 of CuO-CeO2 catalyst prepared by soft template hydrothermal method are the main factors for its excellent CO catalytic oxidation activity. |
| Keywords: soft template CuO-CeO2 catalyst CO oxidation |
| 投稿时间：2015-03-13 修订日期：2015-05-25 |
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| 张秋林,徐利斯,刘昕,宁平.P123软模板对CuO-CeO2结构及其CO催化氧化性能的影响[J].无机化学学报,2015,31(8):1555-1562. |
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