Microwave-assisted catalytic oxidation of gaseous toluene with a Cu-Mn-Ce/cordierite honeycomb catalyst

doi:10.1007/s11705-018-1738-3

Front. Chem. Sci. Eng.

2019, Vol. 13

Issue (2) : 385-392 https://doi.org/10.1007/s11705-018-1738-3

RESEARCH ARTICLE

Microwave-assisted catalytic oxidation of gaseous toluene with a Cu-Mn-Ce/cordierite honeycomb catalyst

Longli Bo^1,²(

), Shaoyuan Sun¹

¹. Key Laboratory of Environmental Engineering of Shaanxi Province, School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
². Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xi’an 710055, China

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Abstract

A novel Cu-Mn-Ce/cordierite honeycomb catalyst was prepared by an incipient wetness method and the catalyst was characterized. The active ingredients were present as various spinel species of Cu, Mn and Ce oxides with different valences and they were unevenly dispersed over the surface of the catalyst. The catalytic oxidation of gaseous toluene was primarily investigated using a fixed bed reactor under microwave heating in the continuous flow mode. Under the optimal conditions of 6.7 wt-% loading of the active component, a bed temperature of 200°C, a flow rate of 0.12 m³·h⁻¹ and an initial concentration of toluene of 1000 mg·m⁻³, the removal and mineralization efficiencies of toluene were 98% and 70%, respectively. Thus the use of the microwave effectively improved the oxidation of toluene and this is attributed to dipole polarization and hotspot effects. After four consecutive cycles (a total of 1980 min), the Cu-Mn-Ce/cordierite catalyst still exhibited excellent catalytic activity and structural stability, and the toluene removal was higher than 90%. This work demonstrates the possibility of treating volatile organic compounds in exhaust gases by microwave-assisted catalytic oxidation.

Keywords microwave catalytic oxidation toluene Cu-Mn-Ce/cordierite mineralization

Corresponding Author(s): Longli Bo

Online First Date: 13 August 2018 Issue Date: 22 May 2019

Cite this article:

Longli Bo,Shaoyuan Sun. Microwave-assisted catalytic oxidation of gaseous toluene with a Cu-Mn-Ce/cordierite honeycomb catalyst[J]. Front. Chem. Sci. Eng., 2019, 13(2): 385-392.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-018-1738-3
https://academic.hep.com.cn/fcse/EN/Y2019/V13/I2/385

Fig.1 The schematic diagram of the experimental process

Tab.1 Loaded weights of active components and structural properties of the catalysts.

Fig.2 The temperature-rising curves of carrier and catalysts under microwave radiation

Fig.3 XRD patterns of cordierite carrier and three catalysts

Fig.4 H₂-TPR profiles of three catalysts

Fig.5 SEM images of cordierite carrier and three catalysts. (a) Cordierite carrier; (b) M₁; (c) M₂; (d) M₃; (e) M₂ after 4 times usage

Fig.6 The catalytic oxidation of toluene under different conditions. (a) Comparison of catalysts; (b) Influene of bed temperature; (c) Effect of air flow; (d) Impact of initial concentration.

Fig.7 The mineralization rate of toluene under optimal conditions

Fig.8 The stability of M₂ catalyst

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