Catalytic Reduction of NO by CO over Promoted Cu3Ce0.2Al0.8 Composite Oxides Derived from Hydrotalcite-Like Compounds

Abstract

Catalytic reduction of NO by CO has been studied over a battery of Cu3CexAl(1–x) composite oxide catalysts prepared by coprecipitation method. The solids were further characterized by X-ray diffraction, laser Raman spectra, N2-physisorption (Brunauer–Emmet–Teller (BET)), H2-temperature-programmed reduction, inductively coupled plasma atomic emission spectroscopy, X-ray photoelectron spectroscopy, and in situ diffuse reflectance infrared Fourier transform spectroscopy techniques. The assessment on the catalytic properties were conducted with the NO + CO model reaction. The influences of Cu and different ratios of Ce and Al on the catalytic performance have been investigated. When the ratio of Ce and Al was 1:4, this sample possessed the best catalytic properties, which was exactly derived from hydrotalcite-like compounds. The introduction of a few cerium species (Cu/Ce = 15:1) in the structure improved the activity/selectivity toward selective catalytic reduction of NO by lowering the temperature of carbon...