In situ infrared study of photoreaction of ethanol on Au and Ag/TiO2

Azadeh Rismanchian; Yu Wen Chen; Steven S.C. Chuang

doi:10.1016/j.cattod.2015.07.038

In situ infrared study of photoreaction of ethanol on Au and Ag/TiO₂

Azadeh Rismanchian, Yu Wen Chen, Steven S.C. Chuang

Department of Chemical and Materials Engineering

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

Abstract

An in situ IR technique was used to study the role of Au and Ag additives on photocatalytic reaction of ethanol on TiO₂ at 300 K. Au and Ag additives increased water/ethanol coverage and decreased the rate of ethanol's C-H scission, a step involving in scavenging photogenerated holes. Au and Ag promoted adsorption of ethanol as monodentate ethoxy, accelerated its conversion to formate (HCOO^-_ad) and acetate (CH₃COO^-_ad). In contrast, adsorbed ethanol on TiO₂ did not produce IR-observable products and exhibited a Stark effect with a decreased C-H intensity upon accumulation of photogenerated electrons.

Original language	English
Pages (from-to)	16-22
Number of pages	7
Journal	Catalysis Today
Volume	264
DOIs	https://doi.org/10.1016/j.cattod.2015.07.038
State	Published - 15 Apr 2016

Keywords

Ag/TiO
Au/TiO
In situ IR
Photo-oxidation
Surface hydroxyl
Water/ethanol coverage

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10.1016/j.cattod.2015.07.038

Cite this

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title = "In situ infrared study of photoreaction of ethanol on Au and Ag/TiO2",

abstract = "An in situ IR technique was used to study the role of Au and Ag additives on photocatalytic reaction of ethanol on TiO2 at 300 K. Au and Ag additives increased water/ethanol coverage and decreased the rate of ethanol's C-H scission, a step involving in scavenging photogenerated holes. Au and Ag promoted adsorption of ethanol as monodentate ethoxy, accelerated its conversion to formate (HCOO-ad) and acetate (CH3COO-ad). In contrast, adsorbed ethanol on TiO2 did not produce IR-observable products and exhibited a Stark effect with a decreased C-H intensity upon accumulation of photogenerated electrons.",

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AU - Rismanchian, Azadeh

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AU - Chuang, Steven S.C.

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N2 - An in situ IR technique was used to study the role of Au and Ag additives on photocatalytic reaction of ethanol on TiO2 at 300 K. Au and Ag additives increased water/ethanol coverage and decreased the rate of ethanol's C-H scission, a step involving in scavenging photogenerated holes. Au and Ag promoted adsorption of ethanol as monodentate ethoxy, accelerated its conversion to formate (HCOO-ad) and acetate (CH3COO-ad). In contrast, adsorbed ethanol on TiO2 did not produce IR-observable products and exhibited a Stark effect with a decreased C-H intensity upon accumulation of photogenerated electrons.

AB - An in situ IR technique was used to study the role of Au and Ag additives on photocatalytic reaction of ethanol on TiO2 at 300 K. Au and Ag additives increased water/ethanol coverage and decreased the rate of ethanol's C-H scission, a step involving in scavenging photogenerated holes. Au and Ag promoted adsorption of ethanol as monodentate ethoxy, accelerated its conversion to formate (HCOO-ad) and acetate (CH3COO-ad). In contrast, adsorbed ethanol on TiO2 did not produce IR-observable products and exhibited a Stark effect with a decreased C-H intensity upon accumulation of photogenerated electrons.

KW - Ag/TiO

KW - Au/TiO

KW - In situ IR

KW - Photo-oxidation

KW - Surface hydroxyl

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