Flash Synthesis and CO Oxidation of Macro-/Nano-porous Co3O4–CeO2 Via Self-Sustained Decomposition of Metal–Organic Complexes

Abstract

Three-dimensional macro/mesoporous Co 3 O 4 -CeO 2 was prepared via a facile self-sustained decomposition of metal-organic complexes. Porous Co 3 O 4 -CeO 2 was characterized using X-ray diffraction, scanning electron microscopy/-transmission electron microscopy imaging, N 2 adsorption/ desorption and X-ray photoelectron spectroscopy to examine the morphology and microstructure to find out the cause. Co 3 O 4 -CeO 2 with the 3D hierarchical porous structure consisting of nanoparticles is a coral-like shape with a size of tens of micrometers and exhibits the hierarchically porous morphology, in which the walls of the macropores contain smaller mesopores. The catalytic performance of the porous Co 3 O 4 -CeO 2 for CO oxidation has been studied. Among the obtained catalysts, the porous Co 3 O 4 -CeO 2 with 20 wt% Co exhibits the best catalytic activity and the 50 % CO conversion can be reached at 74°C. The presence of transition metal element Co can promote the production of oxygen vacancies and improve oxygen mobility, which result in enhancing the oxygen-storage capacity of porous Co 3 O 4 -CeO 2 and its catalytic performance for CO conversion. Graphical Abstract& Yude Wang

The noble metals M (M = Pd, Ag, Au) decorated CeO2 catalysts derived from solution combustion method for efficient low-temperature CO catalytic oxidation: effects of different M loading on catalytic performances

“…More information about the influencing factors of 5% Ag-CeO 2 catalytic performance can be obtained from the XPS spectrum of O 1s in figure 6 x -( ) These results are consistent with the results of previous research tests [35,36]. As we know, The content of adsorbed oxygen in the catalyst is closely related to its catalytic performance [37].…”

Applications of hierarchically structured porous materials from energy storage and conversion, catalysis, photocatalysis, adsorption, separation, and sensing to biomedicine

“…Three dimensional macro/mesoporous Co 3 O 4 -CeO 2 is prepared via a facile self-sustained decomposition of metal-organic complexes. 295 which the walls of the macropores contain smaller mesopores. TEM investigations give further insight into the morphology and the structural features of the as-synthesized material.…”

CeO2–Co3O4 nanocomposite with oxidase-like activity for colorimetric detection of ascorbic acid

“…The peaks located at 883.2, 898.9, 901.6, and 917.3 eV are related to Ce 4+ , 26 while the peaks at 881.2 and 905.1 eV correspond to Ce 3+ . 27,28 These results reveal the existence of mixed valence cerium (Ce 4+ /Ce 3+ ) in the ceria lattice. The Co 2p spectrum (Fig.…”