Journal
CATALYSIS COMMUNICATIONS
Volume 75, Issue -, Pages 78-82Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.catcom.2015.12.010
Keywords
CO2 hydrogenation; Cu based catalysts; DME synthesis; Mixed oxide; Bifunctional catalyst
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Funding
- National Natural Science Foundation of China [21366004, 21425627]
- Guangxi Zhuang Autonomous Region
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology
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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 Hy. The catalysts were characterized by X-ray diffraction (XRD), N-2 adsorption -desorption, H-2-temperature programmed reduction (H-2-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. (C) 2015 Elsevier B.V. All rights reserved.
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