Fabrication of Pt/Co3O4 nanocatalysts based on pollen template for low-temperature CO oxidation
Bo Jiang, Mingzhen Huang, Dongren Cai, Kok Bing Tan, Guowu Zhan
Abstract
Herein, we prepared supported Pt/Co3O4 nanocatalysts for CO oxidation by using a biological template method. It was found that the pollen template after base etching favored the deposition of Co(OH)2 and the fabrication of Co3O4 after calcination treatment. The Pt/bio-Co3O4-BB supported catalyst prepared by twice base etching treatments exhibited excellent catalytic activity, which could totally convert CO to CO2 at 70 °C. Especially, the first base etching treatment on the pollen template would etch a higher amount of biological components from the core of pollen, which was beneficial to the deposition of Co3O4, while the second base etching treatment on bio-Co3O4 support before the immobilization of Pt further modified the surface properties and improved catalyst activity. In-situ DRIFTS and XPS characterizations demonstrated that base treatment could promote the formation of oxygen vacancies and increase the surface ratio of Pt0/Pttotal, which enhanced the CO adsorption. Accordingly, we provide a new biological template synthetic strategy for catalysts with controlled morphology and good catalytic activity.