Synergistic effect between the acidity and redox performance of the SO42−-CeO2 catalysts for NO reduction

Herein, a series of SO42−-CeO2 catalysts were synthesized by a sol-gel method for the selective catalytic reduction of NO by NH3 (NH3-SCR). The introduction of SO42− endowed composite catalyst with higher catalytic activity than pure CeO2. In particular, 3% SC with 3% SO42− showed over 90% NO remova...

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Bibliographic Details
Published in:Chemical physics impact 2023-06, Vol.6, p.100215, Article 100215
Main Authors: Zhang, Jinhui, Liu, Jiayao, Zhu, Xinfeng, Wang, Kai, Huang, Zhenzhen, Kang, Haiyan, Yin, Shiqiang, Liu, Shoushu, Liu, Luwei, Zhang, Siyuan, Song, Zhongxian
Format: Article
Language:English
Subjects:
CeO2
In-situ drifts
NH3-SCR
SO42
Synergistic effect
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Summary:Herein, a series of SO42−-CeO2 catalysts were synthesized by a sol-gel method for the selective catalytic reduction of NO by NH3 (NH3-SCR). The introduction of SO42− endowed composite catalyst with higher catalytic activity than pure CeO2. In particular, 3% SC with 3% SO42− showed over 90% NO removal between 247 and 450 °C. SO42− promoted the increase of Ce3+ content, adsorbed oxygen, and surface acidity of the composites. Furthermore, the interaction between SO42− and cerium oxide induced the synergistic effect between acidic sites and redox sites in the NH3-SCR reaction. The introduction of SO42− significantly supported the increase of B-acid and the enhancement of l-acid sites, and promoted the NH3-SCR reaction to follow both Eley-Rideal and Langmuir-Hinshelwood mechanisms. [Display omitted]
ISSN:2667-0224
2667-0224
DOI:10.1016/j.chphi.2023.100215