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Study of La2−xCaxCuO4 perovskites for the low temperature water gas shift reaction

Paper ID Volume ID Publish Year Pages File Format Full-Text
41096 45877 2012 9 PDF Available
Title
Study of La2−xCaxCuO4 perovskites for the low temperature water gas shift reaction
Abstract

The effects of small fractions of calcium (x = 0, 0.05, 0.1, 0.15, and 0.20) on the structure and the catalytic properties of La2−xCaxCuO4 peroviskites have been investigated. The samples have been synthesized using the co-precipitation method. Perovskite-type oxides were characterized by XRD, TPR, XPS, XANES, SEM, and TEM. Catalytic tests for the water gas shift reaction (WGSR) were carried out in a tubular reactor at 290 °C. All samples showed a well-defined perovskite structure with surface areas between 6 and 18 m2 g−1. The partial substitution of La by Ca enhanced the stability of the perovskites and increased their reduction temperature. All catalysts were actives for WGSR, and the best catalytic performance was obtained for the La1.85Ca0.15CuO4 catalyst, but the samples with 5 and 10% of Ca had the best TOF values for reaction. These results can be associated to promoter effect of calcium, the high surface area, and the reducible species Cu0 and Cu1+.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (120 K)Download as PowerPoint slideHighlights► La2−xCaxCuO4 samples were synthesized. ► This perovskites are active for the gas shift reaction at 290 °C. ► A promoter effect of Ca was observed. ► The best catalytic performance was obtained for the La1.85Ca0.15CuO4 catalyst. ► La1.85Ca0.15CuO4 catalyst presented the highest content of surface calcium and the reducible species Cu0 and Cu1+.

Keywords
Water gas shift reaction; Perovskites; Catalysts
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Study of La2−xCaxCuO4 perovskites for the low temperature water gas shift reaction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 413–414, 31 January 2012, Pages 85–93
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
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