Biomass is one of the most potential alternatives of fossil fuel.The production of high value-added chemicals from biomass is an effective way to realize the diversified application of biomass.A hydrotalcite-derived Ni/Al2O3 catalyst was prepared via urea precipitation and temperature-programmed reduction,which was analyzed with X-ray diffraction(XRD).The catalytic performance of Ni/Al2O3 catalysts hydrocracking of corn stover was investigated in water-methanol mixed solvent.The results show that Ni/Al2O3 catalyst exhibits good catalytic performance,and the corn stover conversion rate is up to 100%,and the diols yield is 38.8%,and the phenolic monomers yield is 13.6%under the optimum conditions(V(H2O):V(CH3OH)=7:3,240℃and 3.0 MPa H2).V(H2O):V(CH3OH)and temperature show notable impacts on corn stover conversion rate and small yields of molecule products.Ni/Al2O3 catalyst and atmosphere influence small molecule products as well as products distribution.Cyclic test of the catalyst after one cycle reveals that the yields of diols and aromatic monomers decrease to 10.8%and 5.4%,respectively.Based on the results of Raman spectroscopy,it is speculated that the decrease in catalyst activity may be due to the formation of carbon deposits on the catalyst surface.Furthermore,it can be inferred that Ni/Al2O3 catalyst shows crucial role in the stabilization of active intermediates by analyzing the generation pathways of diols and aromatic monomers.
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