Selective Mechanisms of WO 3 Catalyzing CO 2 Desorption and Inhibiting NH 3 Escape

Fengming Chu, Xi Liu, Qianhong Gao, Longchun Zhong, Guozhen Xiao () and Qianlin Wang ()
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Fengming Chu: College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
Xi Liu: College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
Qianhong Gao: College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
Longchun Zhong: Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China
Guozhen Xiao: College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
Qianlin Wang: College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Sustainability, 2023, vol. 15, issue 17, 1-9

Abstract: The high regeneration energy consumption and ammonia escape in the ammonia regeneration process are regarded as the main barriers for the commercial application of CO 2 capture technology based on ammonia solutions. Metal oxides can enhance the CO 2 desorption process and inhibit the ammonia escape at the same time, which can reduce the energy consumption of CO 2 capture systems. Both ammonium carbamate (NH 2 COONH 4 ) and ammonium bicarbonate (NH 4 HCO 3 ) are examined as the rich ammonia solution. The results show that when the concentration of tungsten trioxide (WO 3 ) was 0.1 mol/L, the CO 2 desorption efficiency could be promoted by 18.8% and the ammonia escape efficiency could be reduced about 14%. The mechanism by which WO 3 increased the CO 2 desorption process was clarified by XRD analysis as the production of ammonium tungstate. In addition, the other nine metal oxides exert no catalytic influence on the regeneration process.

Keywords: ammonia escape; CO 2 desorption; ammonia regeneration process; metal oxides; catalysis (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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