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Drosou C, Nikolaraki E, Georgakopoulou T, Fanourgiakis S, Zaspalis VT, Yentekakis IV. Methane Catalytic Combustion under Lean Conditions over Pristine and Ir-Loaded La 1-xSr xMnO 3 Perovskites: Efficiency, Hysteresis, and Time-on-Stream and Thermal Aging Stabilities. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2271. [PMID: 37570587 PMCID: PMC10420673 DOI: 10.3390/nano13152271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Revised: 08/02/2023] [Accepted: 08/03/2023] [Indexed: 08/13/2023]
Abstract
The increasing use of natural gas as an efficient, reliable, affordable, and cleaner energy source, compared with other fossil fuels, has brought the catalytic CH4 complete oxidation reaction into the spotlight as a simple and economic way to control the amount of unconverted methane escaping into the atmosphere. CH4 emissions are a major contributor to the 'greenhouse effect', and therefore, they need to be effectively reduced. Catalytic CH4 oxidation is a promising method that can be used for this purpose. Detailed studies of the activity, oxidative thermal aging, and the time-on-stream (TOS) stability of pristine La1-xSrxMnO3 perovskites (LSXM; X = % substitution of La with Sr = 0, 30, 50 and 70%) and iridium-loaded Ir/La1-xSrxMnO3 (Ir/LSXM) perovskite catalysts were conducted in a temperature range of 400-970 °C to achieve complete methane oxidation under excess oxygen (lean) conditions. The effect of X on the properties of the perovskites, and thus, their catalytic performance during heating/cooling cycles, was studied using samples that were subjected to various pretreatment conditions in order to gain an in-depth understanding of the structure-activity/stability correlations. Large (up to ca. 300 °C in terms of T50) inverted volcano-type differences in catalytic activity were found as a function of X, with the most active catalysts being those where X = 0%, and the least active were those where X = 50%. Inverse hysteresis phenomena (steady-state rate multiplicities) were revealed in heating/cooling cycles under reaction conditions, the occurrence of which was found to depend strongly on the employed catalyst pre-treatment (pre-reduction or pre-oxidation), while their shape and the loop amplitude were found to depend on X and the presence of Ir. All findings were consistently interpreted, which involved a two-term mechanistic model that utilized the synergy of Eley-Rideal and Mars-van Krevelen kinetics.
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Affiliation(s)
- Catherine Drosou
- Laboratory of Physical Chemistry and Chemical Processes, School of Chemical and Environmental Engineering, Technical University of Crete, 731 00 Chania, Crete, Greece; (E.N.); (T.G.); (S.F.)
| | - Ersi Nikolaraki
- Laboratory of Physical Chemistry and Chemical Processes, School of Chemical and Environmental Engineering, Technical University of Crete, 731 00 Chania, Crete, Greece; (E.N.); (T.G.); (S.F.)
| | - Theodora Georgakopoulou
- Laboratory of Physical Chemistry and Chemical Processes, School of Chemical and Environmental Engineering, Technical University of Crete, 731 00 Chania, Crete, Greece; (E.N.); (T.G.); (S.F.)
| | - Sotiris Fanourgiakis
- Laboratory of Physical Chemistry and Chemical Processes, School of Chemical and Environmental Engineering, Technical University of Crete, 731 00 Chania, Crete, Greece; (E.N.); (T.G.); (S.F.)
| | - Vassilios T. Zaspalis
- Department of Chemical Engineering, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece;
- Chemical Process and Energy Resources Institute, Center for Research and Technology Hellas (CPERI/CERTH), 570 01 Thermi, Thessaloniki, Greece
| | - Ioannis V. Yentekakis
- Laboratory of Physical Chemistry and Chemical Processes, School of Chemical and Environmental Engineering, Technical University of Crete, 731 00 Chania, Crete, Greece; (E.N.); (T.G.); (S.F.)
- Institute of GeoEnergy, Foundation for Research and Technology-Hellas (FORTH/IG), 731 00 Chania, Greece
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Suh MJ, Park YK, Ihm SK. One-pot synthesis of perovskite-type metal oxides via confined mesopore and their catalytic activity for toluene oxidation. Catal Today 2016. [DOI: 10.1016/j.cattod.2015.08.057] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Liu D, Zhou W, Wu J. Perovskite LaMnO3/ZSM-5 composites for H2S reactive adsorption at high temperature. ADSORPTION 2016. [DOI: 10.1007/s10450-016-9780-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Royer S, Duprez D, Can F, Courtois X, Batiot-Dupeyrat C, Laassiri S, Alamdari H. Perovskites as substitutes of noble metals for heterogeneous catalysis: dream or reality. Chem Rev 2014; 114:10292-368. [PMID: 25253387 DOI: 10.1021/cr500032a] [Citation(s) in RCA: 358] [Impact Index Per Article: 35.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Sébastien Royer
- Université de Poitiers , CNRS UMR 7285, IC2MP, 4 Rue Michel Brunet, TSA 51106, 86073 Poitiers Cedex, France
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XUE G, ZHAO Y, LIANG J, YUAN Y, WANG S, CHEN D. Properties of La0.9Sr0.1MnO3 and tourmaline compound catalytic materials for methane combustion. J RARE EARTH 2014. [DOI: 10.1016/s1002-0721(14)60150-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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LIU Y, WANG S, GAO D, WANG S. Effect of Ni Addition on Methane Catalytic Combustion Performance of Pd/Al<SUB>2</SUB>O<SUB>3</SUB> Catalyst. CHINESE JOURNAL OF CATALYSIS 2013. [DOI: 10.3724/sp.j.1088.2012.20340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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