Abstract
NOx, COx, and volatile organic compounds (VOCs) widely exist in motor vehicle exhaust, coke oven flue gas, sintering flue gas, and pelletizing flue gas. Potassium species have an excellent promotion effect on various catalytic reactions for the treatment of these pollutants. This work reviews the promotion effects of potassium species on the reaction processes, including adsorption, desorption, the pathway and selectivity of reaction, recovery of active center, and effects on the properties of catalysts, including basicity, electron donor characteristics, redox property, active center, stability, and strong metal-to support interaction. The suggestions about how to improve the promotion effects of potassium species in various catalytic reactions are put forward, which involve controlling carriers, content, preparation methods and reaction conditions. The promotion effects of different alkali metals are also compared. The article number about commonly used active metals and promotion ways are also analyzed by bibliometric on NOx, COx, and VOCs. The promotion mechanism of potassium species on various reactions is similar; therefore, the application prospect of potassium species for the coupling control of multi-pollutants in industrial flue gas at low-temperature is described.
Highlights
NOx, CO, CO2, and volatile organic compounds (VOCs) are widely present in industrial flue gas and motor vehicle exhaust
K modification makes the surface of catalyst rich in potassium species, which increases the number of basic sites, especially the medium and strong basic sites
Catalyst, a large amount of water is adsorbed around the active site, which reduces the strong adsorption of CO and balances the adsorption of H2 O and CO on the active site, increasing the Water-gas shift (WGS) activity [167]
Summary
NOx , CO, CO2 , and volatile organic compounds (VOCs) are widely present in industrial flue gas and motor vehicle exhaust. Catalytic reaction is commonly used for the removal of NOx , COx (x = 0, 1, 2), and VOCs, such as catalytic decomposition, reduction, and oxidation. Catalytic oxidation is commonly used to remove multi-pollutants, such as soot, CO, and VOCs, in motor vehicle exhaust and industrial exhaust gas for removal pollutant [11,12]. Removal and reuse methods for these pollutants are often applied in separate modular units existing in industrial flue gas and motor vehicle exhaust. The recent research progress of K on the catalytic reaction process and the properties of catalysts related to the removal and reuse of NOx , COx (x = 0, 1, 2), and VOCs are reviewed.
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