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Effect of impregnation sequence of Ce promoter on the microstructure and performance of Ce-promoted Rh-Fe/SiO2 for the ethanol synthesis

Paper ID Volume ID Publish Year Pages File Format Full-Text
39032 45801 2016 6 PDF Available
Title
Effect of impregnation sequence of Ce promoter on the microstructure and performance of Ce-promoted Rh-Fe/SiO2 for the ethanol synthesis
Abstract

•SiO2 supported trimetalic Rh-Fe-Ce catalysts were used for ethanol synthesis.•Different impregnation methods were used for the catalyst preparation.•Ce improved the ethanol selectivity of Rh-Fe/SiO2 catalyst.•The improvement extents depended on the catalyst preparation methods.•The Rh-Ce interface is conducive to synthesize ethanol.

Ce-promoted Rh-Fe/SiO2 catalysts were prepared using different impregnation methods and evaluated in syngas conversion to ethanol. The catalyst prepared by co-impregnation method (Rh-Fe-Ce/SiO2) showed higher ethanol selectivity than those prepared by sequential impregnation methods (Ce/Rh-Fe/SiO2 and Rh-Fe/Ce/SiO2). Characterization results indicated that when Ce was co-impregnated with Rh and Fe, it had higher dispersion and inhibited the reduction of Rh oxides. Additionally, the reduction of CeO2 was promoted. The Rh-Fe-Ce/SiO2 catalyst exhibited the highest spatial association between Rh and Ce, which was responsible for the highest ethanol selectivity.

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Keywords
CO hydrogenation; Impregnation sequence; Ethanol; Ce promotion
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Effect of impregnation sequence of Ce promoter on the microstructure and performance of Ce-promoted Rh-Fe/SiO2 for the ethanol synthesis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 510, 25 January 2016, Pages 227–232
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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