In situ FT-IR study of the adsorption and photocatalytic oxidation of ethanol over sulfated and metallized TiO2

被引：55

作者：

Murcia, J. J. ^{[1
]}

Hidalgo, M. C. ^{[1
]}

Navio, J. A. ^{[1
]}

Arana, J. ^{[2
]}

Dona-Rodriguez, J. M. ^{[2
]}

机构：

[1] Univ Seville, CSIC, ICMS, Seville 41092, Spain

[2] Univ Las Palmas Gran Canaria, Dept Quim, CIDIA, Las Palmas Gran Canaria 35017, Spain

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2013年 / 142卷

关键词：

Sulfated TiO2 photocatalysts; Pt-TiO2; Au-TiO2; Ethanol photo-oxidation; FT-IR; SURFACE; DEGRADATION; CATALYSTS; MECHANISM; ACIDITY; NH3; CO;

D O I：

10.1016/j.apcatb.2013.05.022

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

TiO2 Degussa P25, TiO2 prepared by sol-gel submitted to sulfation pre-treatment and some metallized catalysts obtained by photodeposition of Au or Pt over the sulfated TiO2, were evaluated in the reaction of ethanol photo-oxidation. FT-IR spectroscopy was used to investigate the surface features of the photocatalysts, identifying adsorbed species and following the evolution of intermediate products in the ethanol photo-oxidation reaction. Nature of surface acidity in terms of Bronsted and Lewis centers was also studied. Results showed that sulfation pre-treatment and metallization were important factors influencing the selectivity. Acetaldehyde was the main oxidation product on sulfated TiO2; in the case of P25 also acetates production was observed. The photodeposition of metals had a detrimental effect on the selectivity to acetaldehyde; on metallized catalysts the formation of stable secondary intermediates was detected. Based on these findings, a reaction pathway for the ethanol photo-oxidation over the different photocatalysts, via acetaldehyde or via acetate formation is proposed. Crown Copyright (c) 2013 Published by Elsevier B.V. All rights reserved.

引用

页码：205 / 213

页数：9

共 40 条

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