A one-pot synthesis of Cu-modified Mn-rich MnSAPO-34 catalyst with excellent low temperature NH3-selective catalytic reduction performance and H2O resistance

A one-pot synthetic method was used to prepare copper (Cu)-modified manganese (Mn)-rich MnSAPO34 catalysts, which were then used for NOx removal from stationary-source flue gas. The addition of Cu to these Mn-rich MnSAPO-34 catalysts significantly enhanced their low temperature (LT) selective catalytic reduction (SCR) activity and H2O resistance. The Mn(0.4)Cu(0.05)SAPO-34 catalysts demonstrated excellent LT NH3-SCR activity, with NOx removal being >90% from 160 to 300 degrees C. In addition, Mn(0.4)Cu(0.05)SAPO-34 catalysts exhibited high H2O resistance. This excellent performance was ascribed to strong synergistic effects between Mn4+ and isolated Cu2+ species in Mn(0.4)Cu(0.05)SAPO-34 catalysts, leading to suitable redox ability. The results of in situ FT-IR analysis indicated that LT-SCR reactions mainly proceeded by an Eley- Rideal reaction pathway at 200 degrees C in Cu-modified manganese-rich MnSAPO-34 catalysts. Thus, Mn(0.4)Cu(0.05)SAPO-34 was considered as a promising candidate for NOx removal from flue gas of stationary sources at low temperatures. (c) 2020 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.

Automated summary

Copper-modified manganese-rich MnSAPO34 catalysts prepared by a one-pot synthetic method exhibited excellent low-temperature SCR activity and water resistance, making them promising candidates for NOx removal from stationary-source flue gas.