Additional effects of Pt and Nb on hierarchically porous titania in the catalytic removal of n-butanol

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• 作者：Manuel Franco Finol ; Joanna Rooke ; Bao-Lian Su ; Martine Trentesaux ; Jean-Marc Giraudon ; Jean-Fran?ois Lamonier
• 关键词：VOC ; Catalytic oxidation ; TiO2 ; Platinum ; Niobium ; n-Butanol
• 刊名：Catalysis Today
• 出版年：2012
• 出版时间：30 September, 2012
• 年：2012
• 卷：192
• 期：1
• 页码：154-159
• 全文大小：831 K

文摘

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 m² g^?1), even after calcination at 400 ¡ãC. 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 (¡Ö100 ¡ãC). 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 ¡ãC of Pt/5 % Nb-TiO₂ catalyst was 4 times higher than for Nb-free Pt/TiO₂ catalyst.