Ni@C/Al2O3的制备及其对杨木屑的还原催化分馏OA北大核心

A new type of Ni@C/Al2O3 catalyst is prepared by chelating ethylenediamine tetraacetic acid(EDTA)ligand with Ni2+,using a ligand protection method.X-ray diffraction(XRD)and BET characterization show that the Ni-EDTA complex can facilitate the high dispersion of nickel metal nanoparticles on the support surface.And,a porous carbon layer covering the surface of the Ni particles are formed after the calcination of EDTA,which can inhibit the sintering of Ni metal particles.The Ni@C/Al2O3 catalyst is used in the reduction catalytic fractionation(RCF)of poplar sawdust,and the preparation conditions of the catalyst are optimized with the yield of phenolic monomer products in lignocellulose RCF reaction as the evaluation index.The optimal preparation parameters of Ni@C/Al2O3 catalyst are that the loading amount of Ni active component is 28％,and the molar ratio of EDTA/Ni follows a stoichiometric relationship of 1∶1.In this case,the yield of phenolic monomer products in RCF reaction reaches the highest value of 34.5％.The Ni loading amount should not be too high,otherwise the Ni metal particles will agglomerate significantly,and it is difficult to form a core-shell structure covered by carbon layer.