Investigation Of Ethanol Dry Reforming Over Co-based Catalysts

Typically,ethanol dry reforming is an efficient process using biomass-derived ethanol and the undesirable greenhouse gas CO2 as reactants to produce the high-valued syngas.In comparison with the conventional methane dry reforming,this process is more suitable with green chemistry and the sustainable development.Transition metal cobalt(Co)has been widely applied in the field of catalysis considering its promising catalytic performance and low cost.In this paper,a series of Co-based catalysts(Co Ce,CoCeMn)were synthesized by urea coprecipitation method and its catalytic behavior towards to ethanol dry reforming was deeply investigated to shed light on the development of high efficient catalysts.Particularly,a series of characterization technique including X-ray diffraction(XRD),H2-programmed temperature reduction(TPR),N2 adsorption and desorption(BET),transmission electron microscopy(TEM),Raman etc were selected to check the physicochemical features and morphology structure of the as-prepared catalysts.The results elucidated that the incorporation of Mn led to the significant change of the catalyst structure.Interestingly,the dopants could increase the concentration of oxygen vacancy in the catalyst,improve the dispersion of the active metal Co,as well as enhance the metal-support interaction.Therefore,CoCeMn catalyst exhibited the better catalytic activity and stability in ethanol dry reforming.Its outstanding behavior might be attributed to the successful doping of Mn,thereby resulting in the higher dispersion of active metal Co and increasing the concentration of oxygen vacancies.The oxygen vacancies could effectively facilitate the adsorption activation of the reactant CO2 to form the active oxygen species,which dynamically eliminated the surface carbon of the catalyst,and improved the catalyst stability.Moreover,the bimetallic catalysts are prepared via the addition of Ni,Fe into CoCeMn catalyst to explore the alloy effect in the catalysts.The experimental results exhibit that the catalytic activity of Fe-CoCeMn catalyst was further improved.In detail,the CO selectivity of was greatly increased,while the H2 selectivity was not significantly changed.However,the selectivity of byproduct acetone was close to 0 in the process of ethanol dry gas reforming.On the other hand,the addition of Ni species remarkably improved the catalyst activity at the range of low temperature.Unfortunately,Ni-CoCeMn catalyst presented the less stability compared to the undoped CoCeMn sample.In conclusion,the results depicted the synergy effect in the bimetallic catalyst,which was favorable for the design of highly efficient catalyst.