NDLI: A study of the Influence of the Synthesis Conditions upon the Catalytic Properties of LaMnO3.15 in Methane Combustion in the Absence and Presence of H2S

Content Provider	Springer Nature Link
Author	Kaddouri, A. Ifrah, S. Gelin, P.
Copyright Year	2007
Abstract	We report here on the activity and stability of LaMnO3.15 for the methane combustion, in the absence and presence of H2S, in a temperature interval of 250–750 °C. Two powders with different specific surface area were prepared by coprecipitation method using ammonia. Precursors calcined at high temperature, in air, for 10 h have led to LaMn-C solid with SBET = 11 m2/g, while those previously aged in solution (hydrothermal treatment at 200 °C under 20 atm. for 24 h) then calcined at high temperature led to LaMn-HydC with SBET = 31 m2/g. Temperature programmed reduction (TPR) profile of both samples showed two main peaks; surface and weakly bound oxygen named α-oxygen species and lattice oxygen β-oxygen species. While for LaMn-C the maximum reduction temperature peak corresponding to α-oxygen species was found to be ca. 600 °C, for LaMn-HydC samples this peak was shifted to lower temperature ca. 430 °C. Indeed, LaMn-HydC samples showed higher depletion of surface and weakly bound oxygen species compared to LaMn-C. The superior catalytic performance of LaMn-HydC in methane combustion was attributed to its high BET surface area and to both the high amount of α-oxygen species and their mobility. In the presence of 100 ppm H2S in the feed this catalyst showed a higher propensity to poisoning by sulphur compounds than LaMn-C. This was attributed to the rapid formation of stable sulphate/sulphite species, the decomposition of which occurs above 800 °C.
Starting Page	237
Ending Page	244
Page Count	8
File Format	PDF
ISSN	1011372X
Journal	Catalysis Letters
Volume Number	119
Issue Number	3-4
e-ISSN	1572879X
Language	English
Publisher	Springer US
Publisher Date	2007-07-31
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	LaMnO3 .15 Hydrothermal treatment Oxygen depletion Methane combustion Sulphur poisoning Pharmacy Industrial Chemistry/Chemical Engineering Physical Chemistry Catalysis
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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