Study on the effect of Ce-Cu doping on Mn/γ-Al2O3 catalyst for selective catalytic reduction in NO with NH3

A series of Mn/gamma-Al2O3, Mn-Cu/gamma-Al2O3, Mn-Ce/gamma-Al2O3 and Mn-Ce-Cu/gamma-Al2O3 catalysts were prepared by equal volume impregnation. The denitrification effects of the different catalysts were studied by activity measurement, X-ray diffraction, Brunauer, Emmett, and Teller surface area tests, Scanning electron microscopy, H-2-temperature programmed reduction and Fourier-transform infrared spectroscopy. The experimental results show that Ce and Cu are added to a Mn/gamma-Al2O3 catalyst as bimetallic additives, which weakens the interaction between Mn and the carrier, improves the dispersion of MnOx on the surface of the carrier, improves the specific surface area of the catalyst, and improves the reducibility. Mn-Ce-Cu/gamma-Al2O3 catalyst reaches a maximum conversion of 92% at 202 degrees C. Also, the addition of the auxiliary metals promotes the reaction mechanism to a certain extent, and the addition of Ce especially promotes the conversion of NO-NO2, which is conducive to the production of intermediate products that promote the NH3-SCR reaction.