Catalysis Today, Vol.192, No.1, 154-159, 2012
Additional effects of Pt and Nb on hierarchically porous titania in the catalytic removal of n-butanol
Platinum catalysts supported on hierarchically porous TiO2 modified by niobium have been synthesized, characterized and tested for the complete oxidation of n-butanol. It was found that after Nb addition to titania, the hierarchical porous structure (meso- and macropores) was maintained. The anatase titania crystallite size decreased with Nb content which was consistent with the specific surface area increase (> 160 m(2) g(-1)), even after calcination at 400 degrees C. The incorporation of niobium into Pt/TiO2 catalysts led to a significant increase in catalytic activity in comparison with catalyst without niobium addition at a relative low temperature (approximate to 100 degrees C). Nb incorporation promoted the formation of reduced platinum species and resulted also in the formation of very easily reducible species (Pt2+ and Ti4+ in the vicinity). As a result, the activity at 100 degrees C of Pt/5% Nb-TiO2 catalyst was 4 times higher than for Nb-free Pt/TiO2 catalyst. (c) 2011 Elsevier B.V. All rights reserved.