研究目的
Investigating the effect of the interface structure and composition on catalytic dehydrogenation of ethanol.
研究成果
Cu/SiO2/SiC and Cu/C/SiC catalysts show relatively high ethanol conversion and acetaldehyde selectivity (81.4% and 99% respectively) at 280 °C, compared to other catalysts reported so far. The SiO2 surface promotes the dispersion of copper nanoparticles, thus accelerating ethanol conversion. And the carbon layer on SiC substrate shows a relative inert feature, which can suppress secondary reactions of acetaldehyde by facilitating the desorption of acetaldehyde from the C-rich surface, consequently enhancing the selectivity of the reaction.
研究不足
The relatively low surface area and hydrophobic surface of silicon carbide often suffer from scarcity of active sites, which limit its diversified applications in catalysis.
1：Experimental Design and Method Selection:
The study involved modifying the surface of silicon carbide (SiC) to alter the properties of the interface from SiO2-rich to C-rich, and preparing a series of Cu-supported catalysts (Cu/SiC, Cu/SiO2/SiC, and Cu/C/SiC) to investigate the effect of the interface structure and composition on catalytic dehydrogenation of ethanol.
2：Sample Selection and Data Sources:
Commercial silicon carbide (SiC) was used as a precursor for preparing SiO2/SiC and C/SiC supports.
3：List of Experimental Equipment and Materials:
Silicon carbide (
4：9%), carbon tetrachloride (> 5%), Cu(II) nitrate trihydrate (> 0%), and ethanol (7%) were used. Experimental Procedures and Operational Workflow:
SiO2/SiC was prepared by calcination in air at 800 °C for 2 h. C/SiC was prepared by heating silicon carbide to 800 °C in Ar and introducing an Ar stream saturated with CCl4 vapor. Cu/SiC, Cu/SiO2/SiC, and Cu/C/SiC catalysts were prepared by incipient wetness impregnation using Cu(NO3)2·3H2O aqueous solution, followed by reduction in H2 at 350 °C for 2 h.
5：Data Analysis Methods:
The catalysts were characterized by XRD, TEM, H2-TPR, XPS, and H2-N2O titration method. Catalytic performance was evaluated in a fixed-bed reactor under atmospheric pressure.
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