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Study On Ni-based Catalysts For Hydrogenation Of Furfural

Posted on:2008-01-14Degree:MasterType:Thesis
Country:ChinaCandidate:X Y LiFull Text:PDF
GTID:2121360215488134Subject:Industrial Catalysis
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In the first part of this paper, orthogonal test design was applied to optimizesepiolite modification conditions such as acid concentration, acid treatment time,calcination temperature and calcination time. Supported Ni-B-Mo amorphous alloycatalysts were prepared by impregnation combined with chemical reduction methodusing treated sepiolite andγ-Al2O3 as carriers. The liquid phase hydrogenation offurfural (FFR) to furfural alcohol (FFA) was selected as probe reaction. Catalyticperformance of Ni-B-Mo carried by diffirent modificated Sepiolites were investigatedto identify the best modification condition. The results show that Sepiolite treated by10%(mass fraction) HCl for 48 h and calcined at 400℃for 6 h exhibit optimalcatalytic performance.Specific surface area of the sepiolite modificated with optimium condition is112.5 m2/g, which is 2.38 times of that of unmodified sepiolite. Active specificsurface area of catalyst with the optimal carder is 17.61 m2/g tested by H2-TPD. Itsconversion of furfural and selectivity to furfural alcohol is 83.8%and 98.7%,respectively. The conversion and selectivity of Ni-B-Mo/Sep(O) are higher than thoseof Ni-B-Mo/γ-Al2O3.Effects of carriers on the the properties of the catalyst were investigated byInductively Coupled Plasma-Atomic Emission Spectroscopy, differential thermalanalysis, NH3-adsorption infrared spectra, BET surface area, temperatureprogrammed reduction, temperature programmed desorption of hydrogen, furfural andfurfural alcohol. The results show that Ni-B-Mo/Sep exhibits high activity and highselectivity to furfural alcohol. The high activity was attributed to the unique structureof amorphous alloy, more loading of Ni, lewis acid, the promoting effect of Fe insepiolite, more middle-strength adsorption center to H2 or FFR and less adsorptioncenter to FFA. The superior selectivity to furfural alcohol was mainly due to theweaker adsorption of FFA on Ni-B-Mo/Sep, thus further hydrogenation of FFA wasprevented.In the second part of this paper, Supported Ni/γ-Al2O3 catalysts for thehydrogenation of furfural to 2-methylfuran were prepared by impregnation combinedwith ultrasound. The addition of Nd or Eu can make the selectivity to 2-methylfuranof Ni/γ-Al2O3 increased from 93.1%to 96.2%or 97.4%, respectively. While Mo andW can also enhance the selectivity of the catalyst and the selectivity increased from93.1%to 96.8%or 98.8%. The catalytic activity of all the catalysts is 100%...
Keywords/Search Tags:orthogonal test design, modification of sepiolite, aluminum Oxide, nickel, amorphous Ni-B-Mo alloy, hydrogenation of furfural, furfural alcohol, 2-methylfuran
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