Promotional effects of calcination temperature and H2O on the catalytic activity of Al-substituted MnAlO catalysts for low-temperature acetone oxidation

Wan-Peng Zhang; Kun Wu; Junyi Zhao; Jun He; Leiping Wang; Hang Xiao; Jian-Bing Guo; Jian-Rong Li

doi:10.1016/j.chemosphere.2022.134722

Promotional effects of calcination temperature and H₂O on the catalytic activity of Al-substituted MnAlO catalysts for low-temperature acetone oxidation

Chemosphere. 2022 Aug:301:134722. doi: 10.1016/j.chemosphere.2022.134722. Epub 2022 Apr 25.

Authors

Wan-Peng Zhang¹, Kun Wu¹, Junyi Zhao¹, Jun He², Leiping Wang¹, Hang Xiao¹, Jian-Bing Guo³, Jian-Rong Li⁴

Affiliations

¹ Xiamen Key Laboratory of Gaseous Pollutant Control Materials, Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, PR China.
² Key Laboratory of Carbonaceous Wastes Processing and Process Intensification of Zhejiang Province, The University of Nottingham Ningbo China, Ningbo, 315100, PR China. Electronic address: Jun.he@nottingham.edu.cn.
³ College of Chemistry, Minnan Normal University, Zhang zhou, 363000, Fujian, PR China.
⁴ Xiamen Key Laboratory of Gaseous Pollutant Control Materials, Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, PR China. Electronic address: jrli@iue.ac.cn.

PMID: 35483660
DOI: 10.1016/j.chemosphere.2022.134722

Abstract

In order to enhance the role of Al in the materials, Al-substituted MnAlO catalysts were synthesized via the hydrothermal-redox method at different calcination temperatures for acetone oxidation. There were Al-substituted α-MnO₂ and amorphous aluminum oxide existed with homogeneous dispersion of elements in the catalysts. The surface property, reaction rate, CO₂ yield and water resistance of MnAlO catalysts were greatly affected by calcination temperatures. MnAlO-450 catalyst exhibited the best catalytic performance (acetone conversion of 90% at 165 °C) with CO₂ yield higher than 99.7%, which was mainly related to the weaker Mn-O bond strength, lower temperature reducibility and abundant Lewis acid sites. The acetone conversion of MnAlO-450 increased by as much as 16% in the presence of 1 vol% H₂O compared to that in the absence of H₂O at T₅₀ (the temperature for 50% conversion of acetone). The acceleration consumption of ethanol as the main by-product by H₂O improved the catalytic performance. This work would shed light on the Al substitution based catalysts for OVOC oxidation with highly efficient and water resistance.

Keywords: Acetone oxidation; Al substitution; Mn–Al oxides; PTR-MS; Water resistance.