Using Fe Modified Pt/C Catalyst on the Catalyst Hydrogenation of Mixed Nitrochlorobenzene Ammonolysis Products
The 3%Pd/C,3%Pt/C and 3%Pt-Fe/C catalysts were prepared by impregnation-reduction method.The metal content,surface morphology and electronic state of the cata-lysts were characterized by ICP,TEM and XPS.The prepared catalyst was used to catalyze the hydrogenation of o,p-nitroaniline and m-nitrochlorobenzene from the products of mixed nitrochlorobenzene ammoniolysis to synthesize o,p-phenylenediamine and m-chloroaniline.By comparing 3%Pd/C,3%Pt/C and 3%Pt-Fe/C catalysts,the 3%Pt-Fe/C catalyst has the best catalytic effect.Using 3%Pt-Fe/C as catalyst,the influences of various factors on the hydrogenation of mixed nitrochlorobenzene aminolysates were investigated.The optimal re-action conditions were determined as follows:the initial catalyst amount was 0.8%(based on the mass fraction of reactive materials),m(methanol)∶m(water)=50∶50 is solvent,the temperature is 85℃,the pressure is 2 MPa,and the stirring speed is 600 r·min-1.Un-der these conditions,the reactant conversion rate is 100%,the yield of o,p-phenylenedia-mine and m-chloroaniline can reach more than 99%,and the catalyst can be reused for 19 times.The fresh and deactivated Pt-Fe/C catalysts were characterized by BET,CO chemi-sorption and TEM.It was found that the specific surface area of the catalyst decreased sig-nificantly after deactivation,and it was determined that the blockage of catalyst pore was the main cause of catalyst deactivation.
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