On the role of gold nanoparticles in the selective photooxidation of 2-propanol over Au/TiO2

被引：18

作者：

Lueken, Alexander ^{[1
]}

Muhler, Martin ^{[1
]}

Strunk, Jennifer ^{[1
]}

机构：

[1] Ruhr Univ Bochum, Lab Ind Chem, D-44801 Bochum, Germany

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2015年 / 17卷 / 16期

关键词：

EXPERIMENTAL MICROKINETIC APPROACH; LOW-TEMPERATURE OXIDATION; SURFACE ELEMENTARY STEPS; GAS-PHASE OXIDATION; PHOTOCATALYTIC OXIDATION; ISOPROPYL-ALCOHOL; METHANOL OXIDATION; LIQUID-PHASE; TIO2; ADSORPTION;

D O I：

10.1039/c4cp05423g

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：

The gas-phase photooxidation of 2-propanol over Au/TiO2 and TiO2 was studied by infrared spectroscopy and online mass spectrometry to gain insight into the mechanism and the role of gold. The presence of O-2 was found to be essential for the formation of acetone under UV irradiation at room temperature. In the presence of gold nanoparticles the rate of acetone formation was increased compared to pure TiO2. Baseline bending in the ATR-IR spectra was used as a tool to monitor the accumulation of excess electrons. Electron accumulation was absent in the presence of gold and O-2 suggesting that the gold nanoparticles act as co-catalysts enhancing the rate of electron transfer from TiO2 to adsorbed O-2 species.

引用

页码：10391 / 10397

页数：7

共 46 条

[1] Experimental microkinetic approach of the photocatalytic oxidation of isopropyl alcohol on TiO2.: Part 1.: Surface elementary steps involving gaseous and adsorbed C3HxO species [J].

Arsac, F ;

Bianchi, D ;

Chovelon, JM ;

Ferronato, C ;

Herrmann, JM .

JOURNAL OF PHYSICAL CHEMISTRY A, 2006, 110 (12) :4202-4212

[2] Experimental microkinetic approach of the photocatalytic oxidation of isopropyl alcohol on TiO2.: Part 2.: From the surface elementary steps to the rates of oxidation of the C3HxO species [J].

Arsac, F ;

Bianchi, D ;

Chovellon, JM ;

Ferronato, C ;

Herrmann, JM .

JOURNAL OF PHYSICAL CHEMISTRY A, 2006, 110 (12) :4213-4222

[3] Gas phase oxidation of alcohols to aldehydes or ketones catalysed by supported gold [J].

Biella, S ;

Rossi, M .

CHEMICAL COMMUNICATIONS, 2003, (03) :378-379

[4] Photocatalytic dehydrogenation of 2-propanol on TiO2(110) [J].

Brinkley, D ;

Engel, T .

JOURNAL OF PHYSICAL CHEMISTRY B, 1998, 102 (39) :7596-7605

[5] Time-resolved in situ ATR Spectroscopy of 2-propanol oxidation over Pd/Al2O3:: Evidence for 2-propoxide intermediate [J].

Bürgi, T ;

Bieri, M .

JOURNAL OF PHYSICAL CHEMISTRY B, 2004, 108 (35) :13364-13369

[6] INFRARED SPECTROSCOPIC IDENTIFICATION OF SPECIES ARISING FROM REACTIVE ADSORPTION OF CARBON OXIDES ON METAL-OXIDE SURFACES [J].

BUSCA, G ;

LORENZELLI, V .

MATERIALS CHEMISTRY, 1982, 7 (01) :89-126

[7] Molecular Understanding of Reactivity and Selectivity for Methanol Oxidation at the Au/TiO2 Interface [J].

Camellone, Matteo Farnesi ;

Zhao, Jianli ;

Jin, Lanying ;

Wang, Yuemin ;

Muhler, Martin ;

Marx, Dominik .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2013, 52 (22) :5780-5784

[8] Catalytic combustion of volatile organic compounds on Au/CeO2/Al2O3 and Au/Al2O3 catalysts [J].

Centeno, MA ;

Paulis, M ;

Montes, M ;

Odriozola, JA .

APPLIED CATALYSIS A-GENERAL, 2002, 234 (1-2) :65-78

[9] Support effect in high activity gold catalysts for CO oxidation [J].

Comotti, M ;

Li, WC ;

Spliethoff, B ;

Schüth, F .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2006, 128 (03) :917-924

[10] The photoreaction of TiO2 and Au/TiO2 single crystal and powder surfaces with organic adsorbates. Emphasis on hydrogen production from renewables [J].

Connelly, Karen A. ;

Idriss, Hicham .

GREEN CHEMISTRY, 2012, 14 (02) :260-280

← 1 2 3 4 5 →