Alkali-Added Catalysts Based on LaAlO3 Perovskite for the Oxidative Coupling of Methane

In this study, we aimed to enhance the catalytic activity of perovskite catalysts and elucidate their catalytic behavior in the oxidative coupling of methane (OCM), using alkali-added LaAlO3 perovskite catalysts. We prepared LaAlO3_XY (X = Li, Na, K, Y = mol %) catalysts and applied them to the OCM...

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Bibliographic Details
Published in:ChemEngineering 2021-03, Vol.5 (1), p.14
Main Authors: An, Suna, Cho, JeongHyun, Kwon, Dahye, Jung, Ji Chul
Format: Article
Language:English
Subjects:
alkali metals
Carbon dioxide
Carbon monoxide
Catalysts
Catalytic activity
Chemical engineering
Chemical synthesis
Coupling
Dimerization
electrophilic lattice oxygen
Ethane
Ethylene
Heat conductivity
Hydrocarbons
LaAlO3
Lattice vacancies
Metals
Methane
Methyl radicals
Nitrates
oxidative coupling of methane
Oxygen
Perovskites
Selectivity
Sensors
Spectrum analysis
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Summary:In this study, we aimed to enhance the catalytic activity of perovskite catalysts and elucidate their catalytic behavior in the oxidative coupling of methane (OCM), using alkali-added LaAlO3 perovskite catalysts. We prepared LaAlO3_XY (X = Li, Na, K, Y = mol %) catalysts and applied them to the OCM reaction. The results showed that the alkali-added catalysts’ activities were promoted compared to the LaAlO3 catalyst. In this reaction, ethane was first synthesized through the dimerization of methyl radicals, which were produced from the reaction of methane and oxygen vacancy in the perovskite catalysts. The high ethylene selectivity of the alkali-added catalysts originated from their abundance of electrophilic lattice oxygen species, facilitating the selective formation of C2 hydrocarbons from ethane. The high COx (carbon monoxide and carbon dioxide) selectivity of the LaAlO3 catalyst originated from its abundance of nucleophilic lattice oxygen species, favoring the selective production of COx from ethane. We concluded that electrophilic lattice oxygen species play a significant role in producing ethylene. We obtained that alkali-adding could be an effective method for improving the catalytic activity of perovskite catalysts in the OCM reaction.
ISSN:2305-7084
2305-7084
DOI:10.3390/chemengineering5010014