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Hydrogenation of CO2 to dimethyl ether on La-, Ce-modified Cu-Fe/HZSM-5 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
49222 46724 2016 5 PDF Available
Title
Hydrogenation of CO2 to dimethyl ether on La-, Ce-modified Cu-Fe/HZSM-5 catalysts
Abstract

•La and Ce made a great contribution in decreasing Cu outer-shell electron density.•La and Ce improved the reduction ability of Cu–Fe catalyst.•La-, Ce-modified Cu–Fe catalysts compared to Zr-modified Cu–Fe catalyst.•La-, Ce-modified Cu–Fe exhibit excellent stabilities in hydrogenation CO2 to DME.

Cu–Fe–La/HZSM-5 and Cu–Fe–Ce/HZSM-5 bifunctional catalysts were prepared and applied for the direct synthesis of dimethyl ether (DME) from CO2 and H2. The catalysts were characterized by X-ray diffraction (XRD), N2 adsorption–desorption, H2-temperature programmed reduction (H2-TPR), and X-ray photoelectron spectroscopy (XPS). The results showed that La and Ce significantly decreased the outer-shell electron density of Cu and improved the reduction ability of the Cu–Fe catalyst in comparison to the Cu–Fe–Zr catalyst, which may increase the selectivity for DME. The Cu–Fe–Ce catalyst had a greater specific surface area than the Cu–Fe–La catalyst. This promoted CuO dispersion and decreased CuO crystallite size, which increased both the DME selectivity and the CO2 conversion. The catalysts were stable for 15 h.

Keywords
CO2 hydrogenation; Cu based catalysts; DME synthesis; Mixed oxide; Bifunctional catalyst
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Hydrogenation of CO2 to dimethyl ether on La-, Ce-modified Cu-Fe/HZSM-5 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 75, 5 February 2016, Pages 78–82
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
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