http://dx.doi.org/10.1021/es9031997">
 

Document Type

Journal Article

Department/Unit

Department of Chemistry

Title

Hydrothermal fabrication and catalytic properties of La1-xSrxM1-yFeyO3 (M = Mn, Co) that are highly active for the removal of toluene

Language

English

Abstract

A series of La1-xSrxM1-yFe yO3 (M = Mn, Co; X = 0,0.4; y = 0.1,1.0) perovskite-type oxide catalysts have been fabricated via a strategy of citric acid complexation coupled with hydrothermal treatment. The materials are characterized by a number of analytical techniques. The oxidation of toluene is used as a probe reaction for the evaluation of catalytic performance. It is found that both La 0.6Sr0.4FeO3 and LaFeO3 exhibit high activities. The partial substitution of manganese and cobalt with iron can significantly improve the catalytic performance of La0.6Sr 0.4MnO3 and La0.6Sr0.4CoO 3. At toluene/O2 molar ratio = 1/200 and space velocity = 20 000 h-1, the catalytic activity decreases in the sequence of La0.6Sr0.4Co0.9Fe0.1O3 > La0.6Sr0.4FeO3 > La 0.6Sr0.4Mn0.9Fe0.1O3 > LaFeO3 > La0.6Sr0.4CoO3 > La0.6Sr0.4MnO3. Compared to the Fe-free counterparts, the La0.6Sr0.4Mn0.9Fe 0.1O3 and La0.6Sr0.4Co 0.9Fe0.1O3 catalysts are, respectively, 50 and 85 °C lower with regard to the temperature required for complete toluene oxidation. Toluene can be completely oxidized at 245 °C over La 0.6Sr0.4Co0.9Fe0.1O3. The excellent catalytic performance of La0.6Sr0.4Co 0.9Fe0.1O3 can be attributed to the presence of (i) Fe3+-O-Fe4+ couples, (ii) a transition of electronic structure, and (iii) a trace amount of Co3O4. © 2010 American Chemical Society.

Publication Date

2010

Source Publication Title

Environmental Science and Technology

Volume

44

Issue

7

Start Page

2618

End Page

2623

Publisher

American Chemical Society

ISSN (print)

0013936X

ISSN (electronic)

15205851

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