《Table 3–Surface composition and oxidation state of Fe2p species over CuFe-SSZ-13 catalysts from XPS

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《Effect of preparation methods on the performance of CuFe-SSZ-13 catalysts for selective catalytic reduction of NO_x with NH_3》

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The content of Cu and Fe in three catalysts with different methods was tested.As shown in Table 1，the Cu/Fe molar ratios of three CuFe-SSZ-13 was around 1.CuFe-SSZ-13SSIEexhibited the highest Cu and Fe loadings among all catalysts.Nitrogen adsorption–desorption isotherms of three catalysts are shown in Fig.1，and specific surface areas and pore volumes are summarized in Table 1.CuFe-SSZ-13SSIEshowed the lowest specific surface area（599.21 m2/g）and pore volume（0.30 cm3/g），indicating that Cu and Fe species are poorly dispersed in CuFeSSZ-13SSIE.CuFe-SSZ-13HDPand Cu Fe-SSZ-13IEshowed similar specific surface area，which was 655.06 and 651.38 m2/g，respectively.The pore volume of the two catalysts was also similar，which was 0.37 and 0.35 cm3/g.