Enhancing the catalytic oxidation capacity of Pt/TiO2 using a light pre-treatment approach.

Scott, Jason and Irawaty, Wenny and Low, Gary and Amal, Rose (2014) Enhancing the catalytic oxidation capacity of Pt/TiO2 using a light pre-treatment approach. Applied Catalysis B: Environmental, 164. pp. 10-17. ISSN 0926-3373, Jurnal Internasional Bereputasi, Q1 H-Index 188, Impact Factor 2017 11,698

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Official URL: https://www.sciencedirect.com/journal/applied-cata...

Abstract

tThe role of UV light pre-treatment in enhancing Pt/TiO2activity for the catalytic oxidation of formicacid in an aqueous environment and under ambient conditions has been examined. The impact of lightpre-treatment, relaxation time (the period between light pre-treatment and formic acid addition) andre-illumination on the oxidation rate were considered. Pre-illuminating Pt/TiO2provided an almostseven-fold increase in the formic acid oxidation rate compared with the untreated case. The oxidationrate decreased with increasing relaxation time, whereby after 16 h of relaxation it had stabilised at avalue still around three times greater than the untreated sample. Re-illuminating the Pt/TiO2led to acomplete recovery of the transient element of the activity. The Pt deposits were observed to undergopartial oxidation over the course of the reaction and, when coupled with a lower activity being observedupon purging the system with N2, imply the participation of dissolved oxygen in the overall oxidationmechanism. The findings suggest the platinum deposits can inject electrons into adsorbed molecularoxygen where the oxygen remains in an active state ready for oxidising the formic acid. Pre-treatingthe catalyst with light accentuates this effect as additional photogenerated electrons are drawn into thePt deposits from the TiO2and transferred to and held by the adsorbed oxygen. Striking features of thisparticular system is the light pre-treatment effect prevails for an unexpectedly long period (in the orderof hours) and is completely recoverable with re-illumination.

Item Type: Article
Uncontrolled Keywords: Light pre-treatment Platinum Titanium oxide Photocatalytic Formic acid
Subjects: Engineering > Chemical Engineering
Divisions: Journal Publication
Depositing User: F.X. Hadi
Date Deposited: 08 May 2019 08:26
Last Modified: 08 Oct 2019 01:09
URI: http://repository.wima.ac.id/id/eprint/18352

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