1
|
Zhao H, Meng P, Gao S, Wang Y, Sun P, Wu Z. Recent advances in simultaneous removal of NOx and VOCs over bifunctional catalysts via SCR and oxidation reaction. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 906:167553. [PMID: 37802335 DOI: 10.1016/j.scitotenv.2023.167553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 09/26/2023] [Accepted: 09/30/2023] [Indexed: 10/08/2023]
Abstract
NOx and volatile organic compounds (VOCs) are two major pollutants commonly found in industrial flue gas emissions. They play a significant role as precursors in the formation of ozone and fine particulate matter (PM2.5). The simultaneous removal of NOx and VOCs is crucial in addressing ozone and PM2.5 pollution. In terms of investment costs and space requirements, the development of bifunctional catalysts for the simultaneous selective catalytic reduction (SCR) of NOx and catalytic oxidation of VOCs emerges as a viable technology that has garnered considerable attention. This review provides a summary of recent advances in catalysts for the simultaneous removal of NOx and VOCs. It discusses the reaction mechanisms and interactions involved in NH3-SCR and VOCs catalytic oxidation, the effects of catalyst acidity and redox properties. The insufficiency of bifunctional catalysts was pointed out, including issues related to catalytic activity, product selectivity, catalyst deactivation, and environmental concerns. Subsequently, potential solutions are presented to enhance catalyst performance, such as optimizing the redox properties and acidity, enhancing resistance to poisoning, substituting environment friendly metals and introducing hydrocarbon selective catalytic reduction (HC-SCR) reaction. Finally, some suggestions are given for future research directions in catalyst development are prospected.
Collapse
Affiliation(s)
- Huaiyuan Zhao
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Zhejiang Tianlan Environmental Protection Technology Co., Ltd., Hangzhou 311202, China; Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, 866 Yuhangtang Road, Hangzhou 310058, China
| | - Pu Meng
- Zhejiang Tianlan Environmental Protection Technology Co., Ltd., Hangzhou 311202, China; Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, 866 Yuhangtang Road, Hangzhou 310058, China
| | - Shan Gao
- Zhejiang Tianlan Environmental Protection Technology Co., Ltd., Hangzhou 311202, China; Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, 866 Yuhangtang Road, Hangzhou 310058, China.
| | - Yuejun Wang
- Zhejiang Tianlan Environmental Protection Technology Co., Ltd., Hangzhou 311202, China; Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, 866 Yuhangtang Road, Hangzhou 310058, China
| | - Pengfei Sun
- Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Zhongbiao Wu
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, 866 Yuhangtang Road, Hangzhou 310058, China
| |
Collapse
|
2
|
Gao Y, Han Z, Cheng S, Xu D, Pan X. A mixed catalyst prepared by mechanically milling VW/TiO 2 and low content of Pt/Al 2O 3 for SCO of high-concentration NH 3. NEW J CHEM 2022. [DOI: 10.1039/d2nj03452b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The combination of NH3 oxidation and NH3-SCO reaction made Pt0.01@VW catalyst exhibited excellent NH3-SCO performance and very low Pt content.
Collapse
Affiliation(s)
- Yu Gao
- Marine Engineering College, Dalian Maritime University, Dalian 116026, China
| | - Zhitao Han
- Marine Engineering College, Dalian Maritime University, Dalian 116026, China
- Liaoning Research Center for Marine Internal Combustion Engine Energy-Saving, Dalian 116024, China
| | - Shaosi Cheng
- Marine Engineering College, Dalian Maritime University, Dalian 116026, China
| | - Duo Xu
- Marine Engineering College, Dalian Maritime University, Dalian 116026, China
| | - Xinxiang Pan
- Marine Engineering College, Dalian Maritime University, Dalian 116026, China
- Liaoning Research Center for Marine Internal Combustion Engine Energy-Saving, Dalian 116024, China
- School of Electronic and Information Technology, Guangdong Ocean University, Zhanjiang, Guangdong 524088, China
| |
Collapse
|