ZnO modified TiO2 nanotube array supported Pt catalyst for HCHO removal under mild conditions

• Monolith-like Pt/ZnO/TiNT was applied to the trace HCHO oxidation with enhanced efficiency.
• A HCHO conversion of 95% with a 100 h stable performance was achieved over 0.2 wt.% Pt/ZnO/TiNT at 30 °C.
• The superior performance was related to the specific monolith-like structure and superior HCHO adsorption/storage property.

Highly-ordered pore-through TiO2 nanotube arrays (TiNT) are modified with ZnO and then used as the support for a Pt/ZnO/TiNT catalyst. The Pt/ZnO/TiNT is applied to the trace HCHO oxidation under mild conditions. In comparison with the Pt/TiNT without ZnO modification, monolith-like Pt/ZnO/TiNT shows higher activity under parallel preparation and test conditions. A HCHO conversion of 95% with more than 100 h stable performance is achieved over 0.2 wt.% Pt/ZnO/TiNT at 30 °C. The effect of ZnO modification on the structural properties and catalytic performance of Pt/ZnO/TiNT are investigated. The superior performances are related to the enhanced HCHO storage capacity of ZnO/TiNT support, the specific monolith-like structure and the modified metal–support interaction in Pt/ZnO/TiNT.

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