The role of adsorbed oxygen in formic acid oxidation by Pt/TiO2 facilitated by light pre-treatment

被引：26

作者：

Saputera, Wibawa H. ^{[1
]}

Scott, Jason ^{[1
]}

Ganda, Nathania ^{[1
]}

Low, Gary K. -C. ^{[1
]}

Amal, Rose ^{[1
]}

机构：

[1] Univ New South Wales, Particles & Catalysis Res Grp, Sch Chem Engn, Fac Engn, Kensington, NSW, Australia

来源：

CATALYSIS SCIENCE & TECHNOLOGY | 2016年 / 6卷 / 17期

关键词：

PHOTOCATALYTIC MINERALIZATION; TITANIUM-DIOXIDE; ANATASE TIO2; METAL-OXIDES; PLATINUM; CATALYSTS; SURFACE; PHOTOLUMINESCENCE; NANOPARTICLES; HYDROGEN;

D O I：

10.1039/c6cy00939e

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：

Our study demonstrates that adsorbed oxygen species on Pt surfaces (PtOads) and active oxygen species (O-ads(-)) play a critical role in formic acid oxidation under the ambient condition in an aqueous suspension. The impact of light pre-treatment and dissolved oxygen concentration on the generation of surface oxygen species (PtOads and O-ads(-)) was studied using X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR). A strong correlation between the formic acid oxidation rate and the surface oxygen species was observed. Light pre-treatment introduced a greater amount of PtOads and O-ads(-) compared with the untreated Pt/TiO2 and, as a result, invoked an almost seven-fold increase in the formic acid oxidation rate. The amount of surface oxygen species was found to increase with increasing dissolved oxygen concentration in the system which also accelerated the formic acid oxidation rate. Additionally, the decreasing amount of PtOads at the end of the reaction with increasing initial formic acid concentration suggests that the oxygen species are important to, and consumed during, the oxidation process.

引用

页码：6679 / 6687

页数：9

共 38 条

[21] Size- and support-dependent Pt nanocluster catalysis for oxidant-free dehydrogenation of alcohols [J].

Kon, Kenichi ;

Siddiki, S. M. A. Hakim ;

Shimizu, Ken-ichi .

JOURNAL OF CATALYSIS, 2013, 304 :63-71

[22] EPR investigation of TiO2 nanoparticles with temperature-dependent properties [J].

Kumar, CP ;

Gopal, NO ;

Wang, TC ;

Wong, MS ;

Ke, SC .

JOURNAL OF PHYSICAL CHEMISTRY B, 2006, 110 (11) :5223-5229

[23] Photocatalytic reactivity of surface platinized TiO2:: Substrate specificity and the effect of Pt oxidation state [J].

Lee, JS ;

Choi, WY .

JOURNAL OF PHYSICAL CHEMISTRY B, 2005, 109 (15) :7399-7406

[24] Exceptional Photocatalytic Activity of 001-Facet-Exposed TiO2 Mainly Depending on Enhanced Adsorbed Oxygen by Residual Hydrogen Fluoride [J].

Luan, Yunbo ;

Jing, Liqiang ;

Xie, Ying ;

Sun, Xiaojun ;

Feng, Yujie ;

Fu, Honggang .

ACS CATALYSIS, 2013, 3 (06) :1378-1385

[25]

LUNSFORD JH, 1973, CATAL REV, V8, P135

[26] PHOTOCATALYTIC OXIDATION FOR TOTAL ORGANIC-CARBON ANALYSIS [J].

MATTHEWS, RW ;

ABDULLAH, M ;

LOW, GKC .

ANALYTICA CHIMICA ACTA, 1990, 233 (02) :171-179

[27] Effect of Surface Deposited Pt on the Photoactivity of TiO2 [J].

Muhich, Christopher L. ;

Zhou, Yun ;

Holder, Aaron M. ;

Weimer, Alan W. ;

Musgrave, Charles B. .

JOURNAL OF PHYSICAL CHEMISTRY C, 2012, 116 (18) :10138-10149

[28] IDENTIFICATION OF OXYGEN SPECIES ADSORBED ON REDUCED TITANIUM DIOXIDE [J].

NACCACHE, C ;

MERIAUDEAU, P ;

CHE, M ;

TENCH, AJ .

TRANSACTIONS OF THE FARADAY SOCIETY, 1971, 67 (578) :506-+

[29] Photoluminescence of Pt-loaded TiO2 powder [J].

Nakajima, H ;

Mori, T .

PHYSICA B-CONDENSED MATTER, 2006, 376 :820-822

[30] Influence of platinum loading on photoluminescence of TiO2 powder [J].

Nakajima, H ;

Mori, T ;

Watanabe, M .

JOURNAL OF APPLIED PHYSICS, 2004, 96 (01) :925-927

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