Facile Synthesis of Efficient Cu-Co-Fe Ternary Oxides by Pulsed-spray Evaporation CVD for CO Oxidation

Muhammad Waqas 1, 2

Patrick Mountapmbeme Kouotou 1, 3

Achraf El Kasmi 1

Yu Wang 4

Zhen-Yu Tian 1, 2, Email

1 Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 National Advanced School of Engineering of Maroua, University of Maroua, P.O. Box.: 46 Maroua, Cameroon
4 Shanghai Research Institute of Petrochemical Technology, Shanghai 201208, China

Abstract

Thin film of Cu-Co-Fe ternary oxides was prepared by pulsed-spray evaporation chemical vapor deposition (PSE-CVD) for catalytic combustion of CO. The physicochemical properties of as-prepared ternary oxides were comprehensively characterized by SEM, EDS, XPS, XRD and UV-vis spectroscopy techniques. The catalytic performance of the ternary oxides was examined in a fixed-bed reactor with gas hourly space velocity (GHSV) of 75,000 mL g-1 h-1. The results disclosed the formation of amorphous structure of ternary oxides with dome-top-shaped morphology which supplied abundant sites for oxygen evolution. The optical bandgap energies (1.5 and 2.05 eV) of asprepared ternary oxides were lower than their base metal oxide counterparts (2.15-2.18 eV), which enhanced their reducibility due to easier lattice oxygen mobility. The Cu-Co-Fe ternary oxides revealed excellent performance for CO oxidation. The superior performance was linked to the formation of lattice and adsorbed oxygen species, synergetic effects of Cu2+, Co3+ and Fe3+, high reducibility and excessive oxygen mobility. The ternary oxides exhibited attractive stability and the conversion of CO was remained almost constant throughout the 30 hours. This work provides not only an inspiration but also attractive strategy for the development of efficient Cu-Co-Fe ternary oxides for catalytic applications.

Facile Synthesis of Efficient Cu-Co-Fe Ternary Oxides by Pulsed-spray Evaporation CVD for CO Oxidation