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

摘要

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.

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