Facile preparation of 3D ordered mesoporous CuOx–CeO2 with notably enhanced efficiency for the low temperature oxidation of heteroatom-containing volatile organic compounds

Abstract

SBA-16 silica with intact surface hydroxyl groups was quickly obtained (5 min) via a fast-microwaveassisted method, and further adopted as an efficient template for the synthesis of three-dimensional (3D) ordered mesoporous CuO x -CeO 2 catalysts (htpCCx) through a simple and reproducible host-guest interaction. XRD, XPS, H 2 -TPR, and Raman results reveal that many of the Cu 2+ ions in htpCCx are incorporated into the CeO 2 lattice, leading to the formation of a Cu x Ce 12x O 22d solid solution, which produces a large number of oxygen vacancies and enhances the reducibility of the metal. The interaction of Cu and Ce is essential to the reaction as it maintains the Cu 2+ /Cu 1+ and Ce 4+ /Ce 3+ redox couples. The catalyst has a 3D mesostructure and possesses remarkably enhanced low-temperature activity for the combustion of epichlorohydrin. HtpCC20 has been identified as the most powerful catalyst for this reaction, with the reaction rate at 165 uC being about 6.3 and 33.3 times higher than those of catalysts synthesized using conventional incipient impregnation and thermal combustion methods, respectively. Furthermore, htpCC20 shows superior CO 2 selectivity (.99%) and stability (no deactivation occurs after 50 h reaction). It is believed that the dispersion of the active phase, density of surface active oxygen, and lowtemperature reducibility are the dominant factors governing the catalytic performance.

Effect of Calcination Temperature on Catalytic Performance of CeCu Oxide in Removal of Quinoline by Wet Hydrogen Peroxide Oxidation from Water

“…This indicates that the Ce species in the catalysts primarily exist as Ce 4+ , and the Ce species on the surface of the catalyst prepared primarily exist as CeO 2 species. 36 It complies with the XRD characterization result. For Ce 3d spectra of the catalysts, the electron binding energy values of the XPS peaks are consistent.…”

Recent Advances in the Catalytic Oxidation of Volatile Organic Compounds: A Review Based on Pollutant Sorts and Sources

“…The TMO materials are generally less active than the NMSCs, but they possess other advantages such as their low cost, excellent reducibility and thermal stability, and resistance to poisoning. [39][40][41] Efforts have been made to develop efficient TMO catalysts for VOC catalytic oxidation, with the primary aim of enhancing the low-temperature reaction activity, to bridge the activity gap between these systems and NMSCs.…”

Clean synthesis of Cu2O@CeO2 core@shell nanocubes with highly active interface

“…Following the above consideration, the pair formed by the oxidative CeO 2 and the reductive Cu 2 O seems ideal, and their hybrid nanostructures are thus desired to obtain highly active interfaces. 15,16 Unfortunately, few works have been reported on the successful hybridization of CeO 2 and Cu 2 O components via the classic two-step process. The main reason for the lack of successful hybridization is that the preformed Cu 2 O cores cannot withstand the conditions during the coating of CeO 2 in the following step (Cu 2 O could be severely etched by ammonium, which is indispensable during the CeO 2 coating process).…”