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本文研究以DX-30活性炭为载体的镍-铝催化剂制备因素对煤液化油的加氢脱硫脱氮反应的影响。实验结果表明,所制备的催化剂对加氢脱硫脱氮有很好的活性,在选定的实验条件下,脱硫率达到99.8%,脱氮率达63.2%,均高于以氧化铝、二氧化硅为载体的石油精制商品催化剂。研究发现,催化剂活性组份的浸渍顺序,含量、Ni/(Ni+Mo)原子比、催化剂焙烧温度、孔径分布等因素均影响催化剂的脱硫脱氮活性。在制备催化剂时,当先浸镍后浸钼,NiO-MoO_3涂量为35%,Ni/(Ni+Mo)原子比为0.29,焙烧温度为400℃时,催化剂的脱硫脱氮活性最高。实验中采用脉冲色谱法,以有特征集团的试剂分子为吸附质,测定了不同方法制备的催化剂表面酸碱中心集团的数目及分布情况。随催化剂制备方法的不同,催化剂表面酸碱中心数目及分布情况有很大差别。催化剂表面L酸中心有利于脱硫脱氮。
In this paper, DX-30 activated carbon as a carrier of nickel-aluminum catalyst preparation of coal liquefaction oil hydrodesulfurization and denitrification. The experimental results show that the prepared catalyst has good activity for hydrodesulfurization and denitrification. Under the selected experimental conditions, the desulfurization rate reaches 99.8% and the denitrification rate reaches 63.2%, which is higher than that of the catalyst with alumina, Silicon-based petroleum refined commercial catalyst. It was found that the impregnation order, content, atomic ratio of Ni / (Ni + Mo), catalyst calcination temperature, pore size distribution and other factors all affect the desulfurization and denitrification activity of the catalyst. When the catalyst was prepared, the activity of desulfurization and denitrification of the catalyst was the highest when the content of NiO-MoO 3 was 35% and the molar ratio of Ni / (Ni + Mo) was 0.29 at the first immersion nickel and the calcination temperature was 400 ℃. In the experiment, the number and distribution of acid-base center groups of catalyst surface prepared by different methods were determined by pulse chromatography and the reagent molecules with the characteristic group as adsorbate. With the different catalyst preparation methods, there are great differences in the number and distribution of acid-base sites on the catalyst surface. L acid center of the catalyst surface is conducive to desulfurization and denitrification.