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The catalytic activities of nickel-based catalysts were estimated for oxidizing acetaldehyde of VOCs exhausted from industrial facilities. The catalysts were prepared by sol-gel methods of SiO 2 and SiO 2 -TiO 2 as a xerogel followed by impregnating Al 2 O 3 powder with the nickel nitrate precursor. The crystalline structure and catalytic properties for the catalysts were investigated by use of BET surface area, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and temperature programmed reduction (TPR) techniques. These results show that nickel oxide is transformed to NiAl 2 O 4 spinel structure at the calcination temperature of 400 °C in response to the steps with after- and co-impregnation of Al 2 O 3 powder in sol-gel process. The NiAl 2 O 4 could suppress the oxidation reaction of acetaldehyde by catalysts. The NiO is better dispersed on SiO 2 -TiO 2 /Al 2 O 3 support than SiO 2 /Al 2 O 3 and SiO 2 -TiO 2 -Al 2 O 3 supports. From the testing results of catalytic activities for oxidation of acetaldehyde, Catalysts showed a big difference in conversion efficiencies with the way of the preparation of catalysts and the loading weight of nickel. The catalyst of 8 wt.% Ni/TiO 2 -SiO 2 /Al 2 O 3 showed the best conversion efficiency on acetaldehyde oxidation with 100% conversion efficiency at 350 °C.

Catalytic Effects and Characteristics of Ni-based Catalysts Supported on TiO2-SiO2Xerogel

Catalytic Effects and Characteristics of Ni-based Catalysts Supported on TiO₂-SiO₂Xerogel