NDLI: Influence of the mobility of oxygen on the reactivity of La$_{1 − x }$Sr$_{x}$MnO$

Content Provider	SpringerLink
Author	Ivav, D. V. Pinaeva, L. G. Sadovskaya, E. M. Isupova, L. A.
Copyright Year	2011
Abstract	Radically different dependences of the activity of La$_{1 − x }$Sr$_{x}$MnO$_{3}$ (x = 0−0.5) perovskites in methane oxidation on the degree of substitution of strontium for lanthanum are observed for low and high temperatures. Unsubstituted LaMnO$_{3}$ exhibits the highest activity in the temperature range from 300 to 500°C, while the sample with the maximum degree of substitution (La$_{0.5}$Sr$_{0.5}$MnO$_{3}$) shows the highest activity at higher temperatures of 700–900°C. In the low temperature region, the activity of La$_{1t - x }$Sr$_{x}$MnO$_{3}$ is determined by the amount of weakly bound (overstoichiometric) oxygen, which is formed in cation-deficient lattices and is characterized by a thermal desorption peak with T $_{max}$ = 705°C. At higher temperatures (800–900°C), the strongly bound oxygen of the catalyst lattice is involved in the formation of the reaction products under both unsteady- and steady-state conditions. As a consequence, the catalytic activity in methane oxidation correlates with the apparent rate constant of oxygen diffusion in the oxide bulk.
Starting Page	401
Ending Page	408
Page Count	8
File Format	PDF
ISSN	00231584
Journal	Kinetics and Catalysis
Volume Number	52
Issue Number	3
e-ISSN	16083210
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-06-08
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Physical Chemistry Catalysis
Content Type	Text
Resource Type	Article
Subject	Computer Science Applications Catalysis Modeling and Simulation Chemistry

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