Investigation of synergistic effects and high performance of La-Co composite oxides for toluene catalytic oxidation at low temperature

Wu, Mudi; Chen, Shiyi; Soomro, Ahsanullah; Ma, Shiwei; Zhu, Min; Hua, Xinguo; Xiang, Wenguo

doi:10.1007/s11356-019-04672-7

Research Article
Published: 02 March 2019

Investigation of synergistic effects and high performance of La-Co composite oxides for toluene catalytic oxidation at low temperature

Mudi Wu¹,
Shiyi Chen¹,
Ahsanullah Soomro¹,
Shiwei Ma¹,
Min Zhu¹,
Xinguo Hua¹ &
Wenguo Xiang ORCID: orcid.org/0000-0001-9989-0936¹

Environmental Science and Pollution Research volume 26, pages 12123–12135 (2019)Cite this article

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Abstract

Cobalt oxides have been considered as a kind of highly efficient catalyst for the oxidation of volatile organic compounds (VOCs). In this work, lanthanum-cobalt composite oxides were prepared by using the co-precipitation method, and toluene was used as the model compound. Diversified techniques including XRD, SEM, Raman spectra, XPS, H₂-TPR, and N₂ adsorption-desorption were applied to investigate the physicochemical properties of as-prepared materials. The composite catalysts showed different morphology including larger specific surface area and higher pore volume which would accelerate the adsorption of toluene and improve the amount of active sites on surface. Moreover, the addition of lanthanum could enhance the low-temperature reducibility, and it could be also beneficial to expose more Co³⁺ and adsorbed oxygen species on the surface of catalysts which could accelerate the oxidation of toluene and lower onset oxidation temperature. 0.05La-Co (with a molar ratio of lanthanum against cobalt is 0.05) showed the best catalytic performance. The complete conversion of toluene was achieved at 225 °C under the condition of toluene concentration = 1000 ppm and SV = 20,000 ml·g⁻¹·h⁻¹. Stability test over 0.05La-Co was conducted at 225 °C and it could maintain the 100% conversion of toluene for 720 min, indicating the excellent stability of as-prepared catalysts. Undoubtedly, lanthanum-cobalt composite oxide is a kind of promising material for the catalytic oxidation of VOCs.

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Funding

This study was financially supported by the National Natural Science Foundation of China (51606038) and Natural Science Foundation of Jiangsu (BK20160672).

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Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China
Mudi Wu, Shiyi Chen, Ahsanullah Soomro, Shiwei Ma, Min Zhu, Xinguo Hua & Wenguo Xiang

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Mudi Wu
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Shiyi Chen
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Ahsanullah Soomro
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Shiwei Ma
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Min Zhu
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Xinguo Hua
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Wenguo Xiang
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Wu, M., Chen, S., Soomro, A. et al. Investigation of synergistic effects and high performance of La-Co composite oxides for toluene catalytic oxidation at low temperature. Environ Sci Pollut Res 26, 12123–12135 (2019). https://doi.org/10.1007/s11356-019-04672-7

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Received: 12 October 2018
Accepted: 21 February 2019
Published: 02 March 2019
Issue Date: 01 April 2019
DOI: https://doi.org/10.1007/s11356-019-04672-7

Keywords

Lanthanum
VOC
Toluene
Catalytic oxidation
Cobalt oxide