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Kong C, Yao S, Wu Z, Li J, Li G, Zhu J. Promotion Mechanism of CaSO 4 and Au in the Plasma-Assisted Catalytic Oxidation of Diesel Particulate Matter. ACS OMEGA 2022; 7:8640-8650. [PMID: 35309445 PMCID: PMC8928516 DOI: 10.1021/acsomega.1c06659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Accepted: 02/23/2022] [Indexed: 06/14/2023]
Abstract
Plasma-assisted catalysis has been demonstrated to be an innovative technology for eliminating diesel particulate matter (DPM) efficiently at low temperature (≤200 °C). Moreover, past studies have demonstrated that CaSO4, which exists in small concentrations (<2%) in DPM and is toxic in thermal catalytic oxidation processes, actually enhances DPM oxidation during plasma-assisted catalytic processes. However, the role CaSO4 plays in this promotion of DPM oxidation still remains unclear. The present study addresses this issue by investigating the underlying mechanisms of DPM oxidation during plasma-assisted catalytic processes using graphitic carbon as a surrogate DPM material in conjunction with CaSO4- and Au-impregnated γ-Al2O3 catalysts. The results of mass spectrometry and in situ diffuse reflectance infrared Fourier transform spectroscopy, which employs an in situ cell with a small dielectric barrier discharge space over the catalyst bed, demonstrate that CaSO4 can save and release O atoms contributing to graphite oxidation via the -S=O units of CaSO4 through a reversible surface reaction (-S=O + O → -S(-O)2). The results are employed to propose a formal mechanism of graphite oxidation catalyzed by CaSO4 and Au. These findings both improve our understanding of the plasma-assisted catalytic oxidation mechanisms of DPM and support the development of efficient plasma-assisted catalysts.
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Affiliation(s)
- Chengrong Kong
- School
of Environmental and Safety Engineering, Advanced Plasma Catalysis
Engineering Laboratory for China Petrochemical Industry, Changzhou University, Changzhou, Jiangsu 213164, China
| | - Shuiliang Yao
- School
of Environmental and Safety Engineering, Advanced Plasma Catalysis
Engineering Laboratory for China Petrochemical Industry, Changzhou University, Changzhou, Jiangsu 213164, China
| | - Zuliang Wu
- School
of Environmental and Safety Engineering, Advanced Plasma Catalysis
Engineering Laboratory for China Petrochemical Industry, Changzhou University, Changzhou, Jiangsu 213164, China
| | - Jing Li
- School
of Environmental and Safety Engineering, Advanced Plasma Catalysis
Engineering Laboratory for China Petrochemical Industry, Changzhou University, Changzhou, Jiangsu 213164, China
- Engineering
Research Center of Construction Technology of Precast Concrete of
Zhejiang Province, Hangzhou 310018, China
| | - Guojian Li
- School
of Environmental and Safety Engineering, Advanced Plasma Catalysis
Engineering Laboratory for China Petrochemical Industry, Changzhou University, Changzhou, Jiangsu 213164, China
- Engineering
Research Center of Construction Technology of Precast Concrete of
Zhejiang Province, Hangzhou 310018, China
| | - Jiali Zhu
- School
of Environmental and Safety Engineering, Advanced Plasma Catalysis
Engineering Laboratory for China Petrochemical Industry, Changzhou University, Changzhou, Jiangsu 213164, China
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Wan Q, Wang X, Zhao B, Zhao G, Zhao G, Gao E, Gong Y, Yu H, Wang X, Liu D, Tian Y. Influence of calcination temperature on the cooperative catalysis of base sites and gold nanoparticles on hydrotalcite-supported gold materials for the base-free oxidative esterification of 1, 3-propanediol with methanol to methyl 3-hydroxypropionate. REACTION KINETICS MECHANISMS AND CATALYSIS 2021. [DOI: 10.1007/s11144-021-02042-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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