Research on the property enhancement of Ru-based catalyst for Sabatier reaction by oxygen vacancy from the support
In this paper,the formation of oxygen vacancy in the Al2O3 support was induced by urea doping.Through metal-support interaction,the dispersion of Ru-based active species on the surface of the Al2O3 sup-port was improved.The electronic properties of Ru-based active centers was regulated,and then the catalytic performance of the Ru-based catalyst for Sabatier reaction was effectively improved.In this process,it was veri-fied by nuclear magnetic resonance spectroscopy(27Al-NMR)that urea doping can effectively induce the forma-tion of oxygen vacancy in the Al2O3 support.Transmission electron microscopy(TEM)showed that,the loaded Ru particles could be stabilized at about 3.7 nm on the surface of the Al2O3 support rich in oxygen vacancy,and the distribution of particle size was concentrated.By X-ray photoelectron spectroscopy(XPS)and H2pro-grammed temperature reduction(H2-TPR),it was found that the oxygen vacancy from the Al2O3 support can effectively regulate the electronic property of the Ru-based active sites.Sabatier reaction performance test showed that under the reaction condition of 300 ℃,nCO2∶nH2=1∶4 and 6000 mL/(g·h),the conversion rate of CO2 could be reached at 61.25％and the selectivity of CH4 could be reached at 92.31％.Moreover,the cata-lytic performance did not decrease within 20 hours of the reaction time.
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