A Study of Surface Oxygen Species from La-Me-O (Me=Mg, Ca,Sr, Ba) Catalysts for Methane Oxidative Coupling

Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (3): 432.

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A Study of Surface Oxygen Species from La-Me-O (Me=Mg, Ca,Sr, Ba) Catalysts for Methane Oxidative Coupling

WU Bo¹, YUAN Song-Yue¹, YU Zuo-Long²

1. Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022;
2. Chengdu Institute of Organic Chemistry, Academia Sinica, Chengdu

Received:1994-04-08 Revised:1994-08-17 Online:1995-03-24 Published:1995-03-24

Abstract

Abstract: CO₂-TPD was used to study the surface basicity of La-Me-Omixed oxides and O₂TPD, CH₄-TPD were employed to study the surface active oxygen species. Comparing the CO₂-TPD with O₂-TPD, we can see that the basicity of catalyst is in parallel with the catalystic activity. The stronger basicity is more profitable for the catalyst to adsorb oxygen to form active oxygen species and to activate CH₄by breaking a C-Hbond. By comparing the catalytic activity. the results showed that La-Ba-O(La/Ba=7/3) catalyst had the strongest basicity, and it gave the highest CH₄conversion and C₂selectivity. The results from the pulse reaction showed that the lattice oxygen participated in the OCM reaction without gas oxygen, and it was the selective oxygen species.

Key words: Methane, Oxidation coupling, La-Me-O catalyst, Surface oxygen species

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A Study of Surface Oxygen Species from La-Me-O (Me=Mg, Ca,Sr, Ba) Catalysts for Methane Oxidative Coupling

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