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J Environ Sci (China)

Title:		Promotional effect of cobalt doping on catalytic performance of cryptomelane-type manganese oxide in toluene oxidation
Author(s):		Dong N; Chen M; Ye Q; Zhang D; Dai H;
Address:		"Key Laboratory of Beijing on Regional Air Pollution Control, Department of Environmental Science, School of Environmental and Chemical Engineering, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China. Key Laboratory of Beijing on Regional Air Pollution Control, Department of Environmental Science, School of Environmental and Chemical Engineering, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China; R&D Department of Atmospheric Prevention and Control Technology, Guangdong Suncere Technology Co., Ltd., Guangzhou 510220, China. Key Laboratory of Beijing on Regional Air Pollution Control, Department of Environmental Science, School of Environmental and Chemical Engineering, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China. Electronic address: yeqing@bjut.edu.cn. Beijing Key Laboratory for Green Catalysis and Separation, Key Laboratory of Beijing on Regional Air Pollution Control, Key Laboratory of Advanced Functional Materials, Education Ministry of China, and Laboratory of Catalysis Chemistry and Nanoscience, Department of Environmental Chemical Engineering, School of Environmental and Chemical Engineering, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China. Electronic address: hxdai@bjut.edu.cn"
Journal Title:		J Environ Sci (China)
Year:		2023
Volume:		20220323
Issue:
Page Number:		263 - 274
DOI:		10.1016/j.jes.2022.03.024
ISSN/ISBN:		1001-0742 (Print) 1001-0742 (Linking)
Abstract:		"The cryptomelane-type manganese oxide (OMS-2)-supported Co (xCo/OMS-2; x = 5, 10, and 15 wt.%) catalysts were prepared via a pre-incorporation route. The as-prepared materials were used as catalysts for catalytic oxidation of toluene (2000 ppmV). Physical and chemical properties of the catalysts were measured using the X-ray diffraction (XRD), Fourier transform infrared spectroscopic (FT-IR), scanning electron microscopic (SEM), X-ray photoelectron spectroscopy (XPS), and hydrogen temperature-programmed reduction (H(2)-TPR) techniques. Among all of the catalysts, 10Co/OMS-2 performed the best, with the T(90%), specific reaction rate at 245 degrees C, and turnover frequency at 245 degrees C (TOF(Co)) being 245 degrees C, 1.23 x 10(-3) mol(toluene)/(g(cat).sec), and 11.58 x 10(-3) sec(-1) for toluene oxidation at a space velocity of 60,000 mL/(g.hr), respectively. The excellent catalytic performance of 10Co/OMS-2 were due to more oxygen vacancies, enhanced redox ability and oxygen mobility, and strong synergistic effect between Co species and OMS-2 support. Moreover, in the presence of poisoning gases CO(2), SO(2) or NH(3), the activity of 10Co/OMS-2 decreased for the carbonate, sulfate and ammonia species covered the active sites and oxygen vacancies, respectively. After the activation treatment, the catalytic activity was partly recovered. The good low-temperature reducibility of 10Co/OMS-2 could also facilitate the redox process accompanied by the consecutive electron transfer between the adsorbed O(2) and the cobalt or manganese ions. In the oxidation process of toluene, the benzoic and aldehydic intermediates were first generated, which were further oxidized to the benzoate intermediate that were eventually converted into H(2)O and CO(2)"
Keywords:		"*Cobalt *Carbon Dioxide Spectroscopy, Fourier Transform Infrared Toluene Oxygen Cobalt doping Cryptomelane-type manganese oxide Toluene oxidation Volatile organic compound;"
Notes:		"PubMed-not-MEDLINEDong, Ning Chen, Mengyue Ye, Qing Zhang, Dan Dai, Hongxing eng Netherlands 2022/12/13 J Environ Sci (China). 2023 Apr; 126:263-274. doi: 10.1016/j.jes.2022.03.024. Epub 2022 Mar 23"