Preparation and characterization of Ni-Ti-O mixed oxide for selective catalytic reduction of NO under lean-burn conditions

A novel Ni-Ti-O mixed-oxide catalyst was prepared by a homogeneous coprecipitation method and tested in the selective catalytic reduction of NO by propene (C3H6-SCR) in the presence of excess O2. Catalysts with different molar ratios of Ni-Ti were characterized using X-ray diffraction, N2 adsorption-desorption, pyridine adsorption, temperature-programmed desorption, and in-situ Fourier-transform infrared spectroscopy. The Ni1Ti1 catalyst showed good activity in C3H6-SCR at 430 °C and the NOx conversion achieved 68%. This catalyst displayed an anatase structure and had a high surface area (149 m2/g), which is helpful to enhance the catalyst activity. Lewis acid sites were beneficial for adsorbing nitrate, which was the main intermediate produced during the SCR of NO by C3H6.

Graphical abstractA novel Ni-Ti-O mixed-oxide catalyst was used in the selective catalytic reduction of NO by C3H6 under lean-burn conditions; the catalyst demonstrated good activity at 430 °C.Figure optionsDownload full-size imageDownload as PowerPoint slide