Issue 27, 2020

Catalytic combustion of toluene over CeO2–CoOx composite aerogels

Abstract

A rational approach for the optimization of cobalt based catalysts suitable for VOC combustion is to modulate the pore structure and increase the dispersion of active species. In this study, we have prepared CeO2–CoOx composite aerogels with a continuous porous structure using an epoxide-initiated gelation process and evaluated them in the catalytic combustion of toluene. The influence of the Ce/Co ratio on the structural properties and catalytic activities of the CeO2–CoOx aerogels was investigated using various characterization methods. The surface area of the CeO2–CoOx aerogels showed a volcanic curve versus the Ce content. A higher specific surface area of 172 m2 g−1 was observed for the CeO2–CoOx-10 catalyst with a Ce/Co ratio of 1/10. In addition, the presence of Ce modified the redox properties and the surface chemical states of the CeO2–CoOx aerogels, such as the surface Co3+/Co2+ ratios, and surface absorbed oxygen species (O and O2), which played key roles in their catalytic activity. In comparison with different cobalt-based catalysts for toluene oxidation in the previous literature studies, the CeO2–CoOx-10 catalyst in this work exhibited better catalytic performance, reaching an optimal toluene conversion of 90% at 248 °C as well as the highest stability during the durability test under different temperature stages.

Graphical abstract: Catalytic combustion of toluene over CeO2–CoOx composite aerogels

Supplementary files

Article information

Article type
Paper
Submitted
07 Jan 2020
Accepted
08 Jun 2020
First published
08 Jun 2020

New J. Chem., 2020,44, 11557-11565

Catalytic combustion of toluene over CeO2–CoOx composite aerogels

C. Miao, J. Liu, J. Zhao, Y. Quan, T. Li, Y. Pei, X. Li and J. Ren, New J. Chem., 2020, 44, 11557 DOI: 10.1039/D0NJ00091D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements