Effect of preparation method on the catalytic performance of formaldehyde oxidation over octahedral Fe₃O₄ microcrystals supported Pt catalysts

Abstract

Several octahedral Fe₃O₄-supported platinum catalysts were successfully synthesized via impregnation, colloid deposition and co-precipitation methods and characterized using multiple techniques. All Pt/Fe₃O₄ catalysts demonstrated activity in low-temperature HCHO oxidation, with the catalyst prepared by the co-precipitation method (designated Pt/Fe₃O₄-CP-80) exhibiting relatively higher catalytic activity. The results of various characterization techniques revealed that the preparation method could influence the strength of metal-support interactions and the number of surface hydroxyl groups of the Pt/Fe₃O₄ catalysts. It was observed that the metal-support interactions in Pt/Fe₃O₄ catalysts affected their redox properties. The excellent performance of Pt/Fe₃O₄-CP-80 catalyst was mainly attributed to the presence of appropriate interaction between Pt and Fe species, which resulted in the formation of more active interface sites (i.e. Pt-O(OH)_x-Fe species).

Graphical Abstract

Keywords:

• Preparation methods
• Pt
• octahedral Fe₃O₄
• formaldehyde
• oxidation

Acknowledgements

This work was supported by the National Science Foundation of China (Grant No. 51805207), 13th Five-Year Science and Technology Research and Planning Project of Education Department of Jilin province JJKA20180559KJ, Science and Technology Innovation Development Plan Project of Jilin 201750211.