Hydrogenation Of Phenol Over Ni Catalysts:Effect Of Support On The Catalytic Performance

Bio-oil from Lignocellulosic biomass pyrolysis has high viscosity characteristic,high water content,high oxygen content and other disadvantages,so its combustion characteristics and thermal values are much lower than the traditional fossil fue.The oxygen is the main reason for bio-oil and fuel oil properties different.So taking off the oxygen content from the compound is the necessary mean to improve its calorific value and combustion performance.The oxygen of bio-oil is a major source of phenolic compounds which has various oxygencontaining functional groups,therefore,this article select phenol as a model compound to study the catalytic hydrodeoxygenation reaction process,which is important for the conversion of bio-oil upgradingHydrodeoxygenation of phenol involves a series of reaction steps of hydrogenation,dehydration,hydrogenolysis and isomerization,so,under the influence of Ni active component,this article choose different acidic zeolite and a metal oxide as support to prepare bifunctional catalyst using excess metal/acid support by impregnation.These catalysts were characterized by X-ray diffraction,N2 adsorption,temperature-programmed desorption of H2,NH3 temperature-programmed desorption,and probing the conversion of phenol and selectivity of product in Parr5500 autoclave.Experimental results show that the pore structure of the support,the strength of acidity and the number of acid sites having close contact with the hydrogenation activity of catalyst.At a reaction temperature of 493 K,5Mpa hydrogen pressure and reaction180 min,9.2% Ni / Al2O3 up to 85.63% of the phenol conversion rate,the major product selectivity to cyclohexanone higher,as high as 79.2%,while the Ni / HZSM-5 has a more high phenol conversion rate,while the selectivity of up to 93.9% of cyclohexane.