Preparation of High Nickel Catalyst by Precipitation Method and Its Hydrogenation Performance for Reformate Raffinate
The high nickel hydrogenation catalyst was prepared by coprecipitation method using pseudo-boehmite as aluminum source.The hydrogenation activity,stability and feedstock adaptability of the catalyst with different sulfides during processing reformate raffinate were investigated.The results show that compared with industrial catalyst for benzene hydrogenation,the high nickel hydrogenation catalyst prepared by co-precipitation has smaller grain size(10-20 nm),regular morphology and higher metal dispersion(about 13.8％).The catalyst modified with Mg assistant has improved the electronic properties of Ni,and promoted the hydrogenation activity and stability of Ni active components.At the temperature of 120 ℃,pressure of 1 MPa,and volume space speed of 1 h-1,100％olefins and aromatics can be removed from reformate raffinate feedstock(aromatics volume fraction of 3％,olefins volume fraction of 1％,and sulfur mass fraction of 10.3 mg/kg).Compared with industrial catalyst for benzene hydrogenation,the hydrogenation stability time of reformate raffinate can be extended by three times.Compared with thiol-containing feedstock,thiophene-containing feedstock with lower adsorption energy is more likely to adsorb to the nickel active sites and promote the formation of irreversible Ni—S covalent bond,which has a large effect on the stability of high nickel hydrogenation catalyst.
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