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Plasma-Enhanced Chemical Looping Oxidative Coupling of Methane through Synergy between Metal-Loaded Dielectric Particles and Non-Thermal Plasma. Catalysts 2023. [DOI: 10.3390/catal13030557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023] Open
Abstract
A plasma–catalyst hybrid system has been developed for the direct conversion of methane to C2+ hydrocarbons in dielectric barrier discharge (DBD) plasma. TiO2 presented the highest C2+ yield of 11.63% among different dielectric materials when integrated with DBD plasma, which made us concentrate on the TiO2-based catalyst. It was demonstrated that MnTi catalyst showed the best methane coupling performance of 27.29% C2+ yield with 150 V applied voltage, without additional thermal input. The catalytic performance of MnTi catalyst under various operation parameters was further carried out, and different techniques, such as X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and H2-temperature-programmed reduction were used to explore the effect of Mn loading on methane oxidative coupling (OCM) performance. The results showed that applied voltage and flow rate had a significant effect on methane activation. The dielectric particles of TiO2 loaded with Mn not only synergistically affected the coupling reaction, but also facilitated charge deposition to generate a strong local electric field to activate methane. The synergy effects boosted the OCM performance and the C2+ yield became 1.25 times higher than that of the undoped TiO2 under identical operating conditions in plasma, which was almost impossible to occur even at 850 °C on the MnTi catalyst in the absence of plasma. Moreover, the reaction activity of the catalyst was fully recovered by plasma regeneration at 300 °C and maintained its stability in for at least 30 consecutive cyclic redox tests. This work presents a new opportunity for efficient methane conversion to produce C2+ at low temperatures by plasma assistance.
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Reddick I, Mohamed O, Pommerenck J, Coblyn M, Yokochi A, Von Jouanne A, Jovanovic GN, AuYeung N. Longevity Demonstration of Methane to C2 via a Nonthermal Plasma Microreactor. ACS OMEGA 2023; 8:7657-7665. [PMID: 36872988 PMCID: PMC9979358 DOI: 10.1021/acsomega.2c07265] [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: 11/11/2022] [Accepted: 01/30/2023] [Indexed: 06/18/2023]
Abstract
Hydrocarbon processing using plasmas has tremendous potential, yet there still exist many uncertainties pertaining to practical operation over long durations. Previously, it has been demonstrated that a nonthermal plasma operating in a DC glow regime can transform methane into C2 species (acetylene, ethylene, ethane) in a microreactor. Using a DC glow regime in a microchannel reactor allows for lower power consumption, at the expense of greater consequence of fouling. Since biogas can be a source of methane, a longevity study was undertaken to understand how the microreactor system would change over time with a feed mixture of simulated biogas (CO2, CH4) and air. Two different biogas mixtures were used, one of which contained 300 ppm H2S, while the other had no H2S. Potential difficulties observed from previous experiments included carbon deposition on the electrodes, which could interfere with the electrical characteristics of the plasma discharge as well as material deposition in the microchannel, which could affect gas flow. It was found that raising the temperature of the system to 120 °C helped prevent hydrocarbon deposition in the reactor. Purging the reactor periodically with dry air was also found to have positive effects as it removed carbon buildup on the electrodes themselves. Successful operation over a 50 h time period without any significant deterioration was demonstrated.
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Affiliation(s)
- Ian Reddick
- School
of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, Oregon 97331, United States
| | - Omar Mohamed
- School
of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, Oregon 97331, United States
| | - Justin Pommerenck
- School
of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, Oregon 97331, United States
| | - Matthew Coblyn
- School
of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, Oregon 97331, United States
| | - Alexandre Yokochi
- School
of Engineering and Computer, Science, Baylor
University, Waco, Texas 76798, United States
| | - Annette Von Jouanne
- School
of Engineering and Computer, Science, Baylor
University, Waco, Texas 76798, United States
| | - Goran N. Jovanovic
- School
of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, Oregon 97331, United States
| | - Nick AuYeung
- School
of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, Oregon 97331, United States
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Miao Y, Kreider P, Pommerenck J, AuYeung NJ, von Jouanne A, Jovanovic G, Yokochi A. CO 2 Reduction by Multiple Low-Energy Electric Discharges in a Microstructured Reactor: Experiments and Modeling. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c01331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yu Miao
- School of Resources and Environmental Engineering, East China University of Science & Technology, Shanghai 200237, China
| | - Peter Kreider
- Research School of Engineering, The Australian National University, Canberra, ACT 2601, Australia
| | - Justin Pommerenck
- School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, Oregon 97331, United States
| | - Nick Jun AuYeung
- School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, Oregon 97331, United States
| | - Annette von Jouanne
- School of Engineering and Computer Science, Baylor University, Waco, Texas 76798, United States
| | - Goran Jovanovic
- School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, Oregon 97331, United States
| | - Alexandre Yokochi
- School of Engineering and Computer Science, Baylor University, Waco, Texas 76798, United States
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Reddick I, Shareghi A, Miao Y, Pommerenck J, Coblyn M, Yokochi A, Von Jouanne A, Jovanovic G, AuYeung N. Parametric Study of Hydrocarbon Chain Growth from Methane via a Nonthermal Plasma Discharge Microreactor. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c01472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ian Reddick
- School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, Oregon 97331, United States
| | - Adam Shareghi
- School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, Oregon 97331, United States
| | - Yu Miao
- School of Resources and Environmental Engineering, East China University of Science and Technology Shanghai 200237, P. R. China
| | - Justin Pommerenck
- School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, Oregon 97331, United States
| | - Matthew Coblyn
- School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, Oregon 97331, United States
| | - Alexandre Yokochi
- School of Engineering and Computer, Science, Baylor University, Waco, Texas 76798, United States
| | - Annette Von Jouanne
- School of Engineering and Computer, Science, Baylor University, Waco, Texas 76798, United States
| | - Goran Jovanovic
- School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, Oregon 97331, United States
| | - Nick AuYeung
- School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, Oregon 97331, United States
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