Journal
RSC ADVANCES
Volume 2, Issue 17, Pages 6831-6837Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ra20359f
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Funding
- China High-Tech Development 863 Program [2009AA034900, 2009AA03Z340]
- Guangdong Province Universities and Colleges Pearl River Scholar
- Guangdong Province Sci Tech Bureau [2008A080800024, 10151027501000096]
- Chinese Universities Basic Research Founding
- National University of Singapore
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A novel Cu-Fe bimetal supported catalytic system was prepared and applied to the direct dimethyl carbonate (DMC) formation from methanol and CO2. The prepared catalysts were characterized by means of temperature-programmed reduction (TPR), X-ray powder diffraction (XRD), laser Raman spectra (LRS), X-ray photoelectron spectroscopy (XPS) and temperature programmed desorption (TPD). Metallic Cu, Fe and oxygen deficient Fe2O3-x (0 < x < 3) were formed during the reduction and activation step. The supported Cu-Fe bimetal catalysts exhibited good catalytic activity and high stability for the direct DMC formation. Under the reaction conditions at 120 degrees C and 1.2 MPa with space velocity of 360 h(-1), the highest methanol conversion of 5.37% with DMC selectivity of 85.9% could be achieved. The high catalytic performance of the Cu-Fe bimetal catalysts in the DMC formation could be attributed to the interaction of base sites functioned by metallic Cu and Fe with acid sites provided by oxygen deficient Fe2O3-x (0 < x < 3) in the activation of methanol and CO2. The moderate concentration balance of acid and base sites was in favor of DMC formation.
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