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Zheng J, Liu J, Feng X, Liu J, Zong S, Liu L, Fang Y. Outstanding photo-thermo synergy in aerobic oxidation of cyclohexane by bismuth tungstate-bismuth oxychloride high-low heterojunction. J Colloid Interface Sci 2023; 651:304-318. [PMID: 37544220 DOI: 10.1016/j.jcis.2023.07.172] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 07/14/2023] [Accepted: 07/27/2023] [Indexed: 08/08/2023]
Abstract
The difficulty of achieving both high conversion rate and high selectivity is a huge challenge in the catalytic aerobic oxidation of cyclohexane. In this paper, bismuth tungstate-bismuth oxychloride (Bi2WO6-BiOCl) nanoflower heterojunctions prepared via a one-step solvothermal process were applied in the photo-thermo synergetic catalytic oxidation of cyclohexane in the dried air. With the addition of little water at different reaction temperature, the ratio of bismuth to tungsten and the mass ratio of Bi2WO6 to BiOCl can be precisely tailored in the nanoflower sphere composites with thin nanosheets. Their microscopic morphology, elemental composition, crystal structure, and photoelectrochemical characteristics were explored by different characterization methods. The Bi2WO6-BiOCl composites possessed poor photocatalytic and thermal performances with the low conversion rates of 1.43% and 2.68%, respectively. However, through the photo-thermo catalytic oxidation process, an exceptional conversion rate of 13.32% was achieved with excellent selectivity of 99.22% for cyclohexanone and cyclohexanol (KA oil) using the same Bi2WO6-BiOCl composites. This superior performance outstrips Bi2WO6 flowers, BiOCl nanosheets and Bi2WO6-BiOCl composites with other compounding ratios. The creation of a high-low heterojunction in the Bi2WO6-BiOCl composite was confirmed by band energy analysis. The opto-electronic analysis, band energy analysis, sacrifice experiments, and active radical analysis were employed to elucidate the mechanism for the exceptional photo-thermo catalytic performance in detail. This work offers an exploratory solution to the challenges of high energy consumption and the difficulty in simultaneously achieving high selectivity and high conversion rates in cyclohexane oxidation, thus holding significant value.
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Affiliation(s)
- Jia Zheng
- Guangdong University of Technology, School of Light Industry & Chemical Engineering, Guangzhou Key Lab Clean Transport Energy Chemistry, Guangzhou 510006, China; Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Jieyang 515200, China
| | - Jincheng Liu
- Guangdong University of Technology, School of Light Industry & Chemical Engineering, Guangzhou Key Lab Clean Transport Energy Chemistry, Guangzhou 510006, China; Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Jieyang 515200, China.
| | - Xuyang Feng
- Guangdong University of Technology, School of Light Industry & Chemical Engineering, Guangzhou Key Lab Clean Transport Energy Chemistry, Guangzhou 510006, China; Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Jieyang 515200, China
| | - Jiarong Liu
- Guangdong University of Technology, School of Light Industry & Chemical Engineering, Guangzhou Key Lab Clean Transport Energy Chemistry, Guangzhou 510006, China; Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Jieyang 515200, China
| | - Shuang Zong
- Guangdong University of Technology, School of Light Industry & Chemical Engineering, Guangzhou Key Lab Clean Transport Energy Chemistry, Guangzhou 510006, China; Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Jieyang 515200, China
| | - Lingling Liu
- Guangdong University of Technology, School of Light Industry & Chemical Engineering, Guangzhou Key Lab Clean Transport Energy Chemistry, Guangzhou 510006, China; Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Jieyang 515200, China
| | - Yanxiong Fang
- Guangdong University of Technology, School of Light Industry & Chemical Engineering, Guangzhou Key Lab Clean Transport Energy Chemistry, Guangzhou 510006, China; Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Jieyang 515200, China
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Wu X, Fischer M, Nolte A, Lenßen P, Wang B, Ohlerth T, Wöll D, Heufer KA, Pischinger S, Simon U. Perovskite Catalyst for In-Cylinder Coating to Reduce Raw Pollutant Emissions of Internal Combustion Engines. ACS OMEGA 2022; 7:5340-5349. [PMID: 35187349 PMCID: PMC8851438 DOI: 10.1021/acsomega.1c06530] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Accepted: 01/13/2022] [Indexed: 05/16/2023]
Abstract
Aiming to achieve the highest combustion efficiency and less pollutant emission, a catalytic coating for cylinder walls in internal combustion engines was developed and tested under several conditions. The coating consists of a La0.8Sr0.2CoO3 (LSCO) catalyst on an aluminum-based ceramic support. Atomic force microscopy was applied to investigate the surface roughness of the LSCO coating, while in situ diffuse infrared Fourier transform spectroscopy was used to obtain the molecular understanding of adsorption and conversion. In addition, the influence of LSCO-coated substrates on the flame quenching distance was studied in a constant-volume combustion chamber. Investigations conclude that an LSCO coating leads to a reduction of flame quenching at low wall temperatures but a negligible effect at high temperatures. Finally, the influence of LSCO coatings on the in-cylinder wall-near gas composition was investigated using a fast gas sampling methodology with sample durations below 1 ms. Ion molecule reaction mass spectrometry and Fourier transform infrared spectroscopy revealed a significant reduction of hydrocarbons and carbon monoxide when LSCO coating was applied.
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Affiliation(s)
- Xiaochao Wu
- Institute
of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen, Germany
- Center
for Automotive Catalytic Systems Aachen, RWTH Aachen University, 52062 Aachen, Germany
| | - Marcus Fischer
- Chair
for Thermodynamics of Mobile Energy Conversion Systems, RWTH Aachen University, Forckenbeckstraße 4, 52072 Aachen, Germany
| | - Adrian Nolte
- Chair
of High Pressure Gas Dynamics, RWTH Aachen
University, Schurzelter Str. 35, 52074 Aachen, Germany
| | - Pia Lenßen
- Institute
of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52074 Aachen, Germany
| | - Bangfen Wang
- Institute
of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen, Germany
- Center
for Automotive Catalytic Systems Aachen, RWTH Aachen University, 52062 Aachen, Germany
| | - Thorsten Ohlerth
- Institute
of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen, Germany
| | - Dominik Wöll
- Institute
of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52074 Aachen, Germany
| | - Karl Alexander Heufer
- Chair
of High Pressure Gas Dynamics, RWTH Aachen
University, Schurzelter Str. 35, 52074 Aachen, Germany
| | - Stefan Pischinger
- Chair
for Thermodynamics of Mobile Energy Conversion Systems, RWTH Aachen University, Forckenbeckstraße 4, 52072 Aachen, Germany
- Center
for Automotive Catalytic Systems Aachen, RWTH Aachen University, 52062 Aachen, Germany
| | - Ulrich Simon
- Institute
of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen, Germany
- Center
for Automotive Catalytic Systems Aachen, RWTH Aachen University, 52062 Aachen, Germany
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Büker J, Angel S, Salamon S, Landers J, Falk T, Wende H, Wiggers H, Schulz C, Muhler M, Peng B. Structure–activity correlation in aerobic cyclohexene oxidation and peroxide decomposition over Co xFe 3−xO 4 spinel oxides. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00505k] [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
Aerobic cyclohexene oxidation and peroxide decomposition in the liquid phase were performed over a series of CoxFe3−xO4 spinel catalysts exhibiting a volcano plot for the catalytic activity with a maximum at x = 1.
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Affiliation(s)
- Julia Büker
- Laboratory of Industrial Chemistry, Ruhr University Bochum, 44780 Bochum, Germany
| | - Steven Angel
- IVG Institute for Combustion and Gas Dynamics – Reactive Fluids and CENIDE Center for Nanointegration, University of Duisburg-Essen, 47057 Duisburg, Germany
| | - Soma Salamon
- Faculty of Physics, University of Duisburg-Essen, 47057 Duisburg, Germany
| | - Joachim Landers
- Faculty of Physics, University of Duisburg-Essen, 47057 Duisburg, Germany
| | - Tobias Falk
- Laboratory of Industrial Chemistry, Ruhr University Bochum, 44780 Bochum, Germany
| | - Heiko Wende
- Faculty of Physics, University of Duisburg-Essen, 47057 Duisburg, Germany
| | - Hartmut Wiggers
- IVG Institute for Combustion and Gas Dynamics – Reactive Fluids and CENIDE Center for Nanointegration, University of Duisburg-Essen, 47057 Duisburg, Germany
| | - Christof Schulz
- IVG Institute for Combustion and Gas Dynamics – Reactive Fluids and CENIDE Center for Nanointegration, University of Duisburg-Essen, 47057 Duisburg, Germany
| | - Martin Muhler
- Laboratory of Industrial Chemistry, Ruhr University Bochum, 44780 Bochum, Germany
- Max Planck Institute for Chemical Energy Conversion, 45470 Mülheim an der Ruhr, Germany
| | - Baoxiang Peng
- Laboratory of Industrial Chemistry, Ruhr University Bochum, 44780 Bochum, Germany
- Max Planck Institute for Chemical Energy Conversion, 45470 Mülheim an der Ruhr, Germany
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