CuO/zeolite catalyzed oxidation of gaseous toluene under microwave heating

doi:10.1007/s11783-012-0417-8

Front Envir Sci Eng

2013, Vol. 7

Issue (3) : 395-402 https://doi.org/10.1007/s11783-012-0417-8

RESEARCH ARTICLE

CuO/zeolite catalyzed oxidation of gaseous toluene under microwave heating

Longli BO(

), Jianbo LIAO, Yucai ZHANG, Xiaohui WANG, Quan YANG

School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China

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Abstract

The development of a combined process of catalytic oxidation and microwave heating for treatment of toluene waste gas was described in this work. Toluene, a typical toxic volatile organic compound, was oxidized through a fixed bed reaction chamber containing zeolite-supported copper oxide (CuO/zeolite) catalyst mixed with silicon carbide (SiC), an excellent microwave-absorbing material. The target compound was efficiently degraded on the surface of the catalyst at high reaction temperature achieved by microwave-heated SiC. A set of experimental parameters, such as microwave power, air flow and the loading size of CuO etc., were investigated, respectively. The study demonstrated these parameters had critical impact on toluene degradation. Under optimal condition, 92% toluene was removed by this combined process, corresponding to an 80%–90% TOC removal rate. Furthermore, the catalyst was highly stable even after eight consecutive 6-h runs. At last, a hypothetical degradation pathway of toluene was proposed based on the experimental data obtained from gas chromatography-mass spectrum and Fourier transform infrared spectroscopy analyses.

Keywords microwave catalytic oxidation CuO/zeolite catalyst silicon carbide (SiC) toluene

Corresponding Author(s): BO Longli,Email:bolongli@xauat.edu.cn

Issue Date: 01 June 2013

Cite this article:

Longli BO,Jianbo LIAO,Yucai ZHANG, et al. CuO/zeolite catalyzed oxidation of gaseous toluene under microwave heating[J]. Front Envir Sci Eng, 2013, 7(3): 395-402.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-012-0417-8
https://academic.hep.com.cn/fese/EN/Y2013/V7/I3/395

Fig.1 Diagram of fixed bed reactor

Fig.2 Schematic diagram of experimental process. (1. air pump; 2. desiccator; 3. activated carbon adsorption column; 4. flowmeter; 5. microinjector; 6. volatilizer; 7. electric furnace; 8. buffer bottle; 9. temperature controller; 10. fixed bed reactor; 11. microwave oven; 12. ammeter; 13. transformer; 14. organic solvent absorber; 15. lye absorption bottle; 16. gas chromatograph; 17. ex zeolite; 18. thermocouple probe)

Fig.3 Investigation of different factors in removal of toluene. (a) microwave power, other parameters are = 10∶1, = 0.08 m·h, = 18.5 cm, = 40 μL·min and zeolite/Cu= 20∶1; (b) mixing ratio, the others are = 117.3 W, = 0.08 m·h, = 18.5 cm, = 40 μL·min and zeolite/Cu= 20∶1; (c) air flow, others are = 117.3 W, = 10∶1, = 18.5 cm, = 40 μL·min and zeolite/Cu= 20∶1; (d) bed height, other parameters are = 117.3 W, = 10∶1, = 0.08 m·h, = 40 μL·min and zeolite/Cu= 20∶1; (e) toluene flow rate, others are = 117.3 W, = 10∶1, = 0.08 m·h, = 18.5 cm and zeolite/Cu= 20∶1; (f) loaded amount of copper oxide, the others are = 117.3 W, = 10:1, = 18.5 cm, = 4 0 μL·min and = 0.08 m·h

Fig.4 Stability test for CuO/zeolite catalyst

Fig.5 SEM images of the catalysts: (a) zeolite; (b) fresh catalyst; (c) used catalyst

Fig.6 Temperature variation in the fixed bed

Fig.7 Mineralization efficiency of toluene

Fig.8 Total ion chromatogram of the outflow gas

Fig.9 Infrared spectrums of the catalyst and zeolite

Fig.10 Degradation pathway of toluene by catalytic oxidation under microwave irradiation

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