Research Progress in the Application of Core-Shell Catalysts to Air Pollution Control
QI Zhiyong1, GAO Fengyu1,2, TANG Xiaolong1,2,*, YI Honghong1,2, DU Ying1
1 School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 Beijing Key Laboratory of Resource Treatment of Industrial Typical Pollutants, Beijing 100083, China
Abstract: With the development and progress of industry, air pollution is becoming more and more serious, making the end pollution control immediately urgent. Catalyst is the core of catalytic reaction, and its preparation and configuration have become the focus of the field of atmospheric pollution treatment. Conventional single catalyst has some disadvantages such as high cost, easy inactivation, and narrow use conditions. In recent years, the core-shell nanomaterials have attracted the attention of scholars in the field of composite materials owing to their unique cavity structure. They not only have dual functions and multi-functional characteristics that traditional catalysts do not have, but also have broad application prospects in the field of environmental catalysis. Because of its good thermal stability and excellent shape-selective catalytic effect, the core-shell structure catalyst shows excellent overall acti-vity in the catalytic reaction. However, the core-shell composite particles also face some problems, such as easy agglomeration, poor thickness control of core-shell dispersion, and the need to improve the bonding strength. Although some scholars have prepared Mn-based and Ce-based core-shell nanomaterials for air pollution control, and achieved good catalytic effects in recent years, there are still shortcomings in the construction of the core-shell structure and the selection of the preparation methods. At the same time, the targeted application in specific fields needs to be further improved. In this review, firstly, the main methods of preparing core-shell materials such as hydrothermal synthesis, precipitation and template methods are introduced in detail, along with the advantages and disadvantages of various preparation methods. Then the applicable methods for preparing different types of core-shell catalysts, such as metal-based core-shell material, metal oxide-based core-shell material, molecular sieve, hollow core-shell and rattle core-shell materials, are analyzed. Moreover, the research advances of different types of core-shell materials with respects to the main applicatory fields in air pollution control (NH3-SCR denitrification, VOCs removal, high and low concentration CO removal) are summarized. The paper ends with brief but comparative and prospective discussions about the merits and demerits of the currently mainstream core-shell catalysts, and about the major research directions in the near future.
齐致雍, 高凤雨, 唐晓龙, 易红宏, 杜影. 核壳催化剂用于大气污染控制的研究进展[J]. 材料导报, 2023, 37(10): 21060234-12.
QI Zhiyong, GAO Fengyu, TANG Xiaolong, YI Honghong, DU Ying. Research Progress in the Application of Core-Shell Catalysts to Air Pollution Control. Materials Reports, 2023, 37(10): 21060234-12.
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