Catalytic wet oxidation of aqueous methylamine: comparative study on the catalytic performance of platinum–ruthenium, platinum, and ruthenium catalysts supported on titania

Abstract

Promotion of the dispersion of Ru species supported on TiO₂ was achieved by introduction of Pt component and the role of Pt in enhancing the catalytic performances of Pt–Ru was investigated with catalytic wet air oxidation of methylamine used as a probing reaction. It was found that Pt–Ru/TiO₂ displayed a much better catalytic performance compared with Pt/TiO₂ and Ru/TiO₂ catalysts due to having the highest dispersion of active species. Both high total organic carbon conversion and nitrogen selectivity (∼100%) over Pt–Ru/TiO₂ catalyst were achieved at low temperature (200 °C). X-ray photoelectron spectroscopy characterization indicated that there were strong interactions between metal particles and the support, which may increase the catalytic performance of catalysts.

GRAPHICAL ABSTRACT

Keywords:

• Pt–Ru
• dispersion
• CWAO
• TiO₂
• methylamine

Acknowledgements

We acknowledge the financial supports of the National Science Foundation of China (Grant Nos. 21373245, 21173242), 973 and 863 Programs of Department of Sciences and Technology of China (Grant Nos. 2013CB632404, 2012AA051501, 2009CB22003), and the Project Support of Gansu Provincial Science & Technology Department (1304FKCA085).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Supplemental data

Supplemental data for this article can be accessed at http://dx.doi.org/10.1080/09593330.2014.982721.