Effect of magnesium modulation of Ni-Mo/Al2O3 on selectivity of catalyst hydrogenation
In order to explore the effect of additive modification on the selectivity of olefin aromatics in catalytic hydrogena-tion catalysts,a series of Mg-Al2O3 supports with different magnesium contents were prepared by ultrasonic-assisted pre-cipitation,and then Ni-Mo/Mg-Al2O3 catalysts were prepared by equal volume impregnation method.The catalysts were characterized and analyzed by XRD,BET,XPS,NH3-TPD,H2-TPR,etc.The results showed that the introduction of magne-sium additives and alumina support effectively improved the pore texture characteristics of the catalyst,reduced the acidity of the catalyst,improved the distribution morphology of the active components,and promoted the formation of more and more active NiMoS-Ⅱ phases.In the fixed-bed hydrogenation reactor,DCC gasoline was used as the evaluation raw material to explore the hydrodesulfurization and denitrification performance of the catalyst and the influence of the catalyst on the se-lectivity of aromatics and olefins.The results showed that the hydrodesulfurization and denitrification rate of the catalyst modified by magnesium additives could reach 99.9%,and when the amount of magnesium additives was 3%,the olefin satu-ration rate was greater than 99%,and the aromatic loss rate was only 7.2% .The introduction of magnesium additives effec-tively improved the hydrodesulfurization and denitrification capacity of the catalyst,and the selection performance of olefin aromatics of the catalyst could be adjusted by controlling the content of Mg additives,which had great research significance for the improvement of the selection performance of catalytic hydrogenation catalysts.
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