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Yin M, Yun Z, Fan F, Pillai SC, Wu Z, Zheng Y, Zhao L, Wang H, Hou H. Insights into the mechanism of low-temperature H 2S oxidation over Zn-Cu/Al 2O 3 catalyst. CHEMOSPHERE 2022; 291:133105. [PMID: 34843834 DOI: 10.1016/j.chemosphere.2021.133105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 11/12/2021] [Accepted: 11/26/2021] [Indexed: 06/13/2023]
Abstract
Odor pollution caused by toxic chemicals with low human olfactory thresholds, such as hydrogen sulfide (H2S), has become a major cause of environmental grievance world-wide. Although the low-temperature (<180 °C) catalytic oxidation of H2S using metal oxides has received widespread attention, desulfurization performance is not ideal. Herein, a series of Zn-Cu/Al2O3 catalysts were developed using an impregnation method based on the Al2O3 hydrophilicity and the effects of zinc loading on the catalyst physicochemical properties and performance were systematically studied. The catalysts were characterized using inductively coupled plasma-optical emission spectrometry (ICP-OES), N2 adsorption-desorption isotherms, scanning electron microscopy with energy dispersive spectrometry (SEM-EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR) and electron paramagnetic resonance (EPR). It was found that optimization of zinc doping could improve the hydrophilicity of the catalyst, and hence its activity. Catalytic activity was also dependent on operational parameters such as temperature, humidity and space velocity. The Zn3Cu3 catalyst exhibited the highest breakthrough capacity of 353.91 mg/g at 50 °C and at a relative humidity of 50%. The excellent desulfurization performance was attributed to oxygen vacancies contributed by CuO, Cu2O and ZnO, which facilitated the conversion of H2O into hydroxyl radicals. Consequently, a hydroxyl radical-induced desulfurization mechanism over Zn-Cu/Al2O3 is proposed. This work provides a potential green and efficient catalyst for the selective oxidation of H2S.
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Affiliation(s)
- Mengxue Yin
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China; College of Water Sciences, Beijing Normal University, Beijing, 100875, China
| | - Zhichao Yun
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
| | - Feiyue Fan
- Technical Centre for Soil, Agricultural and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing, 100012, China.
| | - Suresh C Pillai
- Centre for Precision Engineering, Materials and Manufacturing Research & Nanotechnology and Bio-Engineering Research Division, Department of Environmental Science, Institute of Technology Sligo, Ash Lane, Sligo, Ireland
| | - Zhihao Wu
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
| | - Yan Zheng
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
| | - Long Zhao
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
| | - Hailong Wang
- Biochar Engineering Technology Research Center of Guangdong Province, School of Environmental and Chemical Engineering, Foshan University, Foshan, Guangdong, 528000, China
| | - Hong Hou
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
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Feng Y, Jia C, Zhao H, Wang K, Wang X. Phase-dependent photocatalytic selective oxidation of cyclohexane over copper vanadates. NEW J CHEM 2022. [DOI: 10.1039/d1nj05677h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three copper vanadates with different crystal phases show different abilities for selective oxidation of cyclohexane.
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Affiliation(s)
- Yi Feng
- Tianjin Key Lab of Membrane Science and Desalination Technology, Chemical Engineering Research Center, College of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Chuanqi Jia
- Tianjin Key Lab of Membrane Science and Desalination Technology, Chemical Engineering Research Center, College of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - He Zhao
- Tianjin Key Lab of Membrane Science and Desalination Technology, Chemical Engineering Research Center, College of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Kang Wang
- Tianjin Key Lab of Membrane Science and Desalination Technology, Chemical Engineering Research Center, College of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Xitao Wang
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin Key Laboratory of Applied Catalysis Science and Technology, College of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
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Yang JH, Lee HJ, Lee HS, Jeon SC, Han YS. Precise control of heat-treatment conditions to improve the catalytic performance of V 2O 5/TiO 2 for H 2S removal. JOURNAL OF HAZARDOUS MATERIALS 2021; 416:125974. [PMID: 34492883 DOI: 10.1016/j.jhazmat.2021.125974] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 04/18/2021] [Accepted: 04/23/2021] [Indexed: 06/13/2023]
Abstract
The purpose of this study is to investigate the influences of atmospheric gas and temperature while preparing V2O5/TiO2 catalysts to find a suitable heat-treatment method to improve catalytic performance during the process of H2S removal. The catalysts prepared by wet-impregnation were heat-treated at different temperatures (400 or 600 ℃) under various atmospheres (Air, N2, or H2). The catalytic tests demonstrated that the catalyst heat-treated at 400 ℃ under N2 atmosphere (N-400) possessed excellent catalytic activities regarding H2S conversion (96.4%) and sulfur yield (89.1%). The characterization results revealed that the mild reducing condition employed for N-400 led to the formation of partially reduced V2O5 crystals and a strong V-Ti interaction owing to the anatase TiO2 phase, resulting in the high oxygen vacancies on the catalyst surface. However, severe reducing conditions (H2 or N2 with 600 ℃) or the higher temperature (600 ℃) induced highly reduced V2O5-x or rutile TiO2 related to a weak V-Ti interaction, respectively, which facilitated lower oxygen vacancies. This study is the first to demonstrate the significance of a precisely controlled heat-treatment to enhance catalytic performance for H2S removal.
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Affiliation(s)
- Jae Hwan Yang
- Department of Environmental Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, South Korea; Department of Environmental & IT Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, South Korea
| | - Hyun Ji Lee
- Department of Environmental Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, South Korea; Department of Environmental & IT Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, South Korea
| | - Hyun Soo Lee
- Department of Environmental Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, South Korea; Department of Environmental & IT Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, South Korea
| | - Sang-Chae Jeon
- School of Materials Science and Engineering, Changwon National University, 20 Changwondaehak-ro, Changwon, Gyeongsangnam-do 51140, South Korea; Department of Materials Convergence and System Engineering, Changwon National University, 20 Changwondaehak-ro, Changwon, Gyeongsangnam-do 51140, South Korea.
| | - Young-Soo Han
- Department of Environmental Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, South Korea; Department of Environmental & IT Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, South Korea
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Rogers O, Pattisson S, Engel RV, Jenkins RL, Whiston K, Taylor SH, Hutchings GJ. Adipic acid formation from cyclohexanediol using platinum and vanadium catalysts: elucidating the role of homogeneous vanadium species. Catal Sci Technol 2020. [DOI: 10.1039/d0cy00914h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The applicability of platinum and vanadium catalysts for the production of adipic acid from cyclohexanediol is severely limited by the instability of the latter species in liquid phase reactions.
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Affiliation(s)
- Owen Rogers
- Cardiff Catalysis Institute
- School of Chemistry
- Cardiff University
- Cardiff
- UK
| | - Samuel Pattisson
- Cardiff Catalysis Institute
- School of Chemistry
- Cardiff University
- Cardiff
- UK
| | - Rebecca V. Engel
- Cardiff Catalysis Institute
- School of Chemistry
- Cardiff University
- Cardiff
- UK
| | - Robert L. Jenkins
- Cardiff Catalysis Institute
- School of Chemistry
- Cardiff University
- Cardiff
- UK
| | - Keith Whiston
- INVISTA Performance Technologies
- The Wilton Centre
- Wilton, Redcar
- UK
| | - Stuart H. Taylor
- Cardiff Catalysis Institute
- School of Chemistry
- Cardiff University
- Cardiff
- UK
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