核壳结构ZIF-67@CuOx催化剂及其低温CO-SCR脱硝研究.

Octahedral core-shell ZIF-67a/b@CuOx (a/b=4/1,2/1,1/1,1/1.5) coated with nano particle ZIF-67 catalyst for low temperature denitrification was prepared by encapsulation method at room temperature and characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (IR), scanning electron microscopy (SEM), specific surface area analyzer (BET). The effect of different amounts of ZIF-67 on the morphology, composition, specific surface area of catalysts and the catalytic reduction performance was studied. The results showed that octahedral CuOx derived by HKUST-1 sintered had good carrying capacity, and the morphology, crystal structure and great BET value of ZIF-67 were kept. When a/b was 4/1, better uniformity and higher dispersion of ZIF-67 and larger specific surface area of catalyst, and the best catalytic low-temperature denitrification were obtained. The catalysts activity of CO-SCR results showed that denitrification rate of ZIF-674/1@CuOx was 86.5% and 95% at 150 and 225°C respectively. The temperature of ZIF-674/1@CuOx was 50°C lower than that of ZIF-67 at the same denitrification rate (86%). Specific surface area of ZIF-674/1@CuOx was largest, 1168.410 m²/g, which provided more reaction interfaces and effective contacts and improved the catalytic denitrification rate. [ABSTRACT FROM AUTHOR]