Study on the catalytic hydrogenation of maleic anhydride by mesoporous carbon-supported Ni catalyst
Succinic anhydride(SA)is the raw material for synthesizing biodegradable plastic-polybutylene succinate(PBS).The research on the preparation of SA catalyst by hydrogenation of maleic anhydride(MA)has important application value.In order to solve the problem of low activity and easy deactivation of the catalyst in maleic anhydride hydrogenation at low temperature,a series of yNi/MC catalysts with different nickel content were prepared by using a kind of mesoporous carbon as the carrier and their properties were characterized and evaluated.Due to the large specific surface area and pore volume of mesoporous carbon,an appropriate Ni loading[40％(mass)]can increase the number of metal nickel site,which is conducive to the high activity in the hydrogenation of maleic.When the Ni loading is relatively lower,increasing the number of active site for weak adsorption of hydrogen is beneficial for improving its catalytic activity in MA hydrogenation.When the load of Ni is higher than 20％(mass),the adsorption and dissociation capacity of H2 is greatly enhanced so that the bridge adsorption of C=C bond on the catalyst surface becomes the bottleneck problem for further boosting the reaction activity.This work demonstrated that the 40Ni/MC catalyst with 40％(mass)Ni loading reduced at 500℃ had a remarkable performance,achieving 100％selectivity towards succinic anhydride and 80.1％conversion of maleic anhydride at a low temperature of 60℃ and high WHSV of 8.3 h-1.Furthermore,this catalyst displayed superior stability during the five successive recycling operations.In addition,when the reaction temperature was increased to 90℃,both the conversion and selectivity are close to 100％.When the fixed bed reaction system was used for evaluation,100％MA conversion and SA selectivity could be maintained after 150 h.Therefore,the as-prepared mesoporous carbon-supported Ni catalyst exhibited a prospective future in maleic anhydride hydrogenation from the viewpoint of industrial application.
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