| 表面覆盖SiO2用于提高Pt-Pd/CeO2-ZrO2-Al2O3商用柴油机氧化型催化剂的抗硫性 |
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| 引用本文： | 杨铮铮,杨怡,赵明,龚茂初,陈耀强.表面覆盖SiO2用于提高Pt-Pd/CeO2-ZrO2-Al2O3商用柴油机氧化型催化剂的抗硫性[J].物理化学学报,2014,30(6):1187-1193. |
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| 作者姓名： | 杨铮铮 杨怡 赵明 龚茂初 陈耀强 |
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| 作者单位： | 1.College of Architecture and Environment, Sichuan University, Chengdu 610064, P. R. China;2.Key Laboratory of Green Chemistry & Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China |
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| 基金项目： | 国家自然科学基金（21173153），国家高技术研究发展计划项目（863）（2013AA065304）及四川省科技厅科技支撑项目（2011GZ0035，2012FZ0008）资助 |
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| 摘 要： | 向Pt-Pd/CeO2-ZrO2-Al2O3 （Pt-Pd/CZA）商用柴油机氧化型催化剂（DOC）中加入多孔SiO2以提高其抗硫性. 使用多层涂覆法在Pt-Pd/CZA 催化剂表面覆盖一层多孔SiO2，从而制得SiO2/Pt-Pd/CeO2-ZrO2-Al2O3（SiO2/Pt-Pd/CZA）抗硫DOC. 并使用扫描电子显微镜（SEM），H2程序升温还原（H2-TPR），氮气吸脱附，X射线能谱（EDX）和热重分析（TGA）等对其进行表征. SEM结果显示，SiO2层以多孔形式均匀覆盖在催化剂表面. 氮气吸脱附结果表明，所添加的SiO2的织构性质与Pt-Pd/CZA 催化剂的织构性质相似，因而表面覆盖的SiO2并未明显改变Pt-Pd/CZA催化剂的比表面积和孔结构. H2-TPR结果证实表面覆盖的SiO2不影响Pt-Pd/CZA催化剂的还原性能. EDX和TGA结果说明表面覆盖SiO2可以抑制硫物种在催化剂表面的形成及累积. 最终，本文所制备的SiO2/Pt-Pd/CZA催化剂在保持Pt-Pd/CZA商用DOC的高活性及耐久性的同时有效提高了其抗硫性.
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| 关 键 词： | 柴油机氧化型催化剂 抗硫性 整体式催化剂 多层涂覆 机动车尾气 |
| 收稿时间： | 2014-03-17 |
| 修稿时间： | 2014-04-28 |
Enhanced Sulfur Resistance of Pt-Pd/CeO2-ZrO2-Al2O3 Commercial Diesel Oxidation Catalyst by SiO2 Surface Cladding |
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| YANG Zheng-Zheng,YANG Yi,ZHAO Ming,GONG Mao-Chu,CHEN Yao-Qiang.Enhanced Sulfur Resistance of Pt-Pd/CeO2-ZrO2-Al2O3 Commercial Diesel Oxidation Catalyst by SiO2 Surface Cladding[J].Acta Physico-Chimica Sinica,2014,30(6):1187-1193. |
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| Authors: | YANG Zheng-Zheng YANG Yi ZHAO Ming GONG Mao-Chu CHEN Yao-Qiang |
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| Institution: | 1.College of Architecture and Environment, Sichuan University, Chengdu 610064, P. R. China;2.Key Laboratory of Green Chemistry & Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China |
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| Abstract: | In this work, porous SiO2 was added to the Pt-Pd/CeO2-ZrO2-Al2O3 (Pt-Pd/CZA) commercial diesel oxidation catalyst (DOC) to improve its sulfur resistibility. The SiO2/Pt-Pd/CeO2-ZrO2-Al2O3 (SiO2/Pt-Pd/CZA) catalyst was prepared by surface coating porous SiO2 onto the Pt-Pd/CZAmonolithic commercial DOC using a multilayer coating method. The as-prepared catalysts were characterized by scanning electron microscopy (SEM), H2 temperature-programmed reduction (H2-TPR), nitrogen adsorption-desorption, energy-dispersive X-ray (EDX) spectroscopy, and thermogravimetric analysis (TGA). SEM images show that the SiO2 layer is porous and uniformly covers the surface of the catalyst. Nitrogen adsorption-desorption isotherm results imply that the texture properties of the as-added SiO2 are similar to those of the Pt-Pd/CZA catalyst, and hence the specific surface area and pore structure of the Pt-Pd/CZA catalyst do not obviously change upon cladding with SiO2. The H2-TPR results imply that the reduction property of the Pt-Pd/CZA catalyst is not obviously affected by surface cladding with SiO2. EDX spectroscopy and TGA results demonstrate that the formation and accumulation of sulfur-contained species on the Pt-Pd/CZA catalyst are suppressed by the SiO2 surface coating. Finally, the as-prepared SiO2/Pt-Pd/CZA catalyst efficiently retained its high catalytic performance and improved the sulfur resistance of the Pt-Pd/CZA commercial DOC. |
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| Keywords: | Diesel oxidation catalyst Sulfur resistance Monolithic catalyst Multilayer coating Vehicle exhaust |
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