Citation: HUANG Yu-Fen, ZHANG Hai-Long, YANG Zheng-Zheng, ZHAO Ming, HUANG Mu-Lan, LIANG Yan-Li, WANG Jian-Li, CHEN Yao-Qiang. Effects of CeO₂ Addition on Improved NO Oxidation Activities of Pt/SiO₂-Al₂O₃ Diesel Oxidation Catalysts[J]. Acta Physico-Chimica Sinica, ;2017, 33(6): 1242-1252. doi: 10.3866/PKU.WHXB201703292 shu

Effects of CeO₂ Addition on Improved NO Oxidation Activities of Pt/SiO₂-Al₂O₃ Diesel Oxidation Catalysts

1.
Key Laboratory of Green Chemistry & Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China;
2.
College of Chemical Engineering, Sichuan University, Chengdu 610064, P. R. China;
3.
College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, Sichuan Province, P. R. China

Received Date: 12 December 2016
Revised Date: 13 March 2017

Fund Project: The project was supported by the National Natural Science Foundation of China (21173153) and National Hi-Tech Research and Development Program of China (863) (2015AA034603).

The catalytic activities for NO oxidation achieved by different amounts of CeO₂-modified Pt/SiO₂-Al₂O₃ catalysts Pt/SiO₂-Al₂O₃-wCeO₂ (the mass fraction w being 0%, 5%, 10%, 15%, 30%), prepared using step-wise impregnation, were investigated in the presence and absence of CO and C₃H₆. The results showed that the NO oxidation activity could be efficiently improved by modification of CeO₂, wherein the 15%-CeO₂-modified catalyst exhibited the maximum NO conversion of 61% even in the presence of CO and C₃H₆, which were proved to inhibit NO₂ formation in this study. A series of characterization methods were performed over the as-prepared samples to correlate their surface and structural characteristics with their enhanced NO oxidation activities. CO-chemisorption illustrated that appropriate CeO₂-loading was effective for enhancing Pt dispersion, thus enhancing Pt surface-to-volume ratio, confirmed by transmission electron microscope (TEM) images. X-Ray Diffraction (XRD) further suggested that ceria addition could suppress the growth of the Pt crystal, resulting in higher surface Pt atomic ratio. Further, H₂ temperature-programmed reduction (H₂-TPR), together with TEM results, implied that the presence of ceria could enhance the interaction between metal and supports, thus facilitating reducibility of both active platinum and ceria. Hence, this study displays that ceria could act as a dispersion promoter and a reducibility booster, both of which are beneficial to NO oxidation activity. The improved NO oxidation activity is significant for the efficient purification of diesel integrated catalytic system.
- CeO₂-modified catalysts,
- Diesel oxidation catalysts,
- NO oxidation,
- Increased surface Pt atomic ratio,
- Pt-Ce interaction
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沈阳化工大学材料科学与工程学院沈阳 110142

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Effects of CeO₂ Addition on Improved NO Oxidation Activities of Pt/SiO₂-Al₂O₃ Diesel Oxidation Catalysts