Global trends on NH3-SCR research for NOx control during 1994–2023: A bibliometric analysis

Selective catalytic reduction technology with NH₃ as reducing agent (NH₃-SCR) has been widely applied to remove NO_x from stationary sources and diesel vehicles. In this paper, we conducted a bibliometric analysis to understand the research trends in NH₃-SCR fields during 1994–2023. The article number was thriving, especially in China. China and USA were the predominant countries with close collaboration relationship. Chinese Academy of Sciences, Tsinghua University and Zhejiang University made greatest contributions, and Politecnico di Milano had strong academic influence. Li, Junhua was prominent author with publishing most articles and mostly cited articles. The stable core author groups had been developed, whose research focuses were identified. Applied Catalysis B: Environment and Energy was the leading journal. The analysis of most frequently cited articles and most frequently used author keywords found six main research domains, including of the low-temperature catalysts, the transition metal modified zeolites, the V-based catalysts, the deactivation and regeneration, the multi-pollutants removal, the aftertreatment system of diesel vehicles and their mechanism studies. Cu-SSZ-13, DFT, the synergistic effect and the simultaneous removal of NO_x and other air pollutants got recent attentions. These findings enriched the understandings in NH₃-SCR fields, giving some guidelines for the future research.