Citation: YANG Zheng-Zheng, YANG Yi, ZHAO Ming, NG 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. doi: 10.3866/PKU.WHXB201404281 shu

Enhanced Sulfur Resistance of Pt-Pd/CeO₂-ZrO₂-Al₂O₃ Commercial Diesel Oxidation Catalyst by SiO₂ Surface Cladding

1.
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

Received Date: 17 March 2014
Available Online: 28 April 2014
Fund Project:

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.
- Diesel oxidation catalyst,
- Sulfur resistance,
- Monolithic catalyst,
- Multilayer coating,
- Vehicle exhaust
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Enhanced Sulfur Resistance of Pt-Pd/CeO2-ZrO2-Al2O3 Commercial Diesel Oxidation Catalyst by SiO2 Surface Cladding

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通讯作者: 陈斌, bchen63@163.com

Enhanced Sulfur Resistance of Pt-Pd/CeO₂-ZrO₂-Al₂O₃ Commercial Diesel Oxidation Catalyst by SiO₂ Surface Cladding