Catalytic Purification of NO_x and PM by Fe-Doped CuCrO₂ Catalyst Using Two Kinds of Carriers

Abstract

Fe-doped CuCrO₂ catalyst CuCr_1−xFe_xO₂ series were prepared by the sol-gel method with different Fe contents. The structure and properties of the catalysts were investigated by XRD(X-ray diffraction), SEM(scanning electron microscope), and XPS(X-ray photoelectron spectroscopy) and the purification effect on NO_x and PM was measured through simulated emission experiments. The results indicate that CuCrO₂ catalyst has good catalytic activity, the maximum NO_x conversion rate can be up to 28.15%, and the ignition temperature of PM can be reduced to 285 °C. When the molecular ratio of Cr: Fe=9:1, the catalyst can achieve better catalytic effect, the maximum NO_x conversion rate will be up to 30.25% and the PM ignition temperature can be reduced to 280 °C. In addition, the catalytic activity of catalyst supported on different carriers was also studied. The results show that catalyst on SiC foam ceramic carrier has better catalytic activity than that on cordierite honeycomb ceramic carrier. The maximum NO_x conversion of CuCrO₂ and CuCr_0.9Fe_0.1O₂ can be increased by 0.72% and 1.33% respectively, and the PM ignition temperature can be further reduced by 15 and 5°C respectively.

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