Effects of the preparation method on the crystallinity and catalytic activity of LaAlO3 perovskites for oxidative coupling of methane

2018 ◽  
Vol 429 ◽  
pp. 55-61 ◽  
Author(s):  
Gihoon Lee ◽  
Ilho Kim ◽  
Inchan Yang ◽  
Jeong-Myeong Ha ◽  
Hyon Bin Na ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxidative Coupling ◽  
Preparation Method ◽  
Oxidative Coupling Of Methane

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

2021 ◽  
Vol 5 (1) ◽  
pp. 14
Author(s):  
Suna An ◽  
JeongHyun Cho ◽  
Dahye Kwon ◽  
Ji Chul Jung
Keyword(s):  
Catalytic Activity ◽  
Oxidative Coupling ◽  
Oxidative Coupling Of Methane ◽  
Lattice Oxygen ◽  
Oxygen Species ◽  
Methyl Radicals ◽  
Ethylene Selectivity ◽  
Perovskite Catalysts ◽  
C2 Hydrocarbons ◽  
Selective Formation

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.

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