Unveiling mechanism and the roles of distinct active sites over Cu/Beta@CeO2 with strong core-shell interface interaction for simultaneous removal of NO and toluene

被引：10

作者：

Jiang, Su ^{[1
,2
]}

Zhang, Liangpeng ^{[1
,2
]}

Zhao, Lingkui ^{[1
,2
]}

Zhang, Junfeng ^{[1
,2
]}

Huang, Yan ^{[1
,2
]}

机构：

[1] Xiangtan Univ, Coll Environm & Resources, Xiangtan 411105, Peoples R China

[2] Hunan Prov Environm Protect Engn Technol Ctr Air C, Xiangtan 411105, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2023年 / 474卷

基金：

中国国家自然科学基金;

关键词：

Cu/Beta@CeO 2 core-shell interface interaction; Toluene oxidation; Simultaneous removal; Identification of active sites; NH3-SCR; SELECTIVE CATALYTIC-REDUCTION; HC-SCR; PERFORMANCE; NH3-SCR; OXIDATION; CU/SAPO-34; RESISTANCE; DRIFTS; COPPER; CE;

D O I：

10.1016/j.cej.2023.145979

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The development of multifunctional catalysts to remove NO and toluene simultaneously from flue gases remains challenging due to the competing effects of the constituents gas. Therefore, identifying the distinct active sites involved in the removal of NO and toluene and determining their effects plays a crucial role in guiding the development of multifunctional catalysts. Cu/Beta@CeO2 catalysts were synthesized using a self-assembly method for simultaneous removal of NO and toluene, while the role of distinct active sites was revealed. The results indicated that NH3 and toluene competed for adsorption at Bronsted acid sites. However, depositing an ultra-thin layer of CeO2 increased the number of Bronsted acid sites for NH3/toluene adsorption and Ce4+ sites for toluene oxidation. The intense Cu-Ce core-shell interface interaction generated Ce3+ and isolated Cu2+ in large amounts, both of which contributed to NH3 activation, NO adsorption/oxidation and the coupling with toluene. By elucidating active site performance during catalytic conversion, this study provides practical guidance on the development of multifunctional catalysts.

引用

页数：15

共 54 条

[1] Synergistic effect between copper and cerium on the performance of Cux-Ce0.5-x-Zr0.5 (x=0.1-0.5) oxides catalysts for selective catalytic reduction of NO with ammonia [J].