Degradation of Formaldehyde over MnO2/CeO2 Hollow Spheres: Elucidating the Influence of Carbon Sphere Self-Sacrificing Templates

Zhu, Chen and Guan, Shengnan and Li, Wenzhi and Ogunbiyi, Ajibola T and Chen, Kun and Zhang, Qi (2021) Degradation of Formaldehyde over MnO2/CeO2 Hollow Spheres: Elucidating the Influence of Carbon Sphere Self-Sacrificing Templates. ACS Omega, 6. pp. 35404-35415. ISSN ACS Publication

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Abstract

as a self-sacrificing template for formaldehyde (HCHO) removal. In the feed gas of 20 ppm of HCHO (balanced by N2) + 20 vol % O2, a HCHO removal efficiency of 70% was achieved at 20 °C and full conversion was reached at around 47 °C at GHSV = 50,000 mL (gcat h)−1 for MnO2/CeO2 hollow spheres. The catalytic performance and structural and chemical properties of MnO2/CeO2 hollow spheres for the removal of core carbon spheres were explored, and the influence of using the carbon sphere as a self-sacrificing template was proved by comparing with carbon@MnO2/CeO2 (a core carbon sphere with a MnO2/CeO2 shell) and nonmorphologic MnO2/CeO2. The properties of the MnO2/CeO2 hollow spheres are significantly improved compared to carbon@MnO2/CeO2 (removal efficiency of 45% at 150 °C) and MnO2/CeO2 (removal efficiency of 46% at 20 °C) as a result of an evolution in the interaction between Mn/Ce and carbon. This increase in the interaction strength seems to (i) increase the oxygen vacancy, (ii) promote the oxygen species mobility, and (iii) improve the chemical stability of the MnO2/CeO2 hollow spheres. We believe that these results are beneficial to the fabrication of binary transition metal oxides and applications of them in HCHO removal.

Item Type:	Article
Subjects:	T Technology > T Technology (General) T Technology > TP Chemical technology
Divisions:	Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User:	nwokealisi
Date Deposited:	16 Oct 2023 15:27
Last Modified:	16 Oct 2023 15:27
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/17386

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