In this paper,a series of NiMoS-nH2[n=0.5,1.0,1.4,2.0,H2 pressure(MPa)]catalysts was prepared using in-situ H2 gas small molecule control technology.The activity evaluation results showed that the NiMoS catalyst(NiMoS-2.0H2)obtained by in-situ control of 2 MPa H2 had the optimal hydrodesulfurization activity.The Al2 O3 support with mesoporous structure was further prepared and utilized during the in-situ synthesis of supported catalyst NiMoS-2.0H2@Al2 O3 for hydrodesulfuriza-tion.The activity evaluation results indicate that the supported NiMoS-2.0H2@Al2 O3 possesses signifi-cantly improved hydrodesulfurization performance than that of NiMoS-2.0H2 powder catalyst sample.Over NiMoS-2.0H2@Al2O3,the removal of benzothiophene is as high as 73％,and the desulfurization efficiency is about twice of NiMoS-2.0H2 powder catalyst under the conditions of 240 ℃and 2 MPa.The XRD,XPS,N2 adsorption-desorption analysis showed that ultra-high specific surface area of loaded NiMoS-2.0H2@Al2O3 can significantly improve the surface dispersion of NiMoS-2.0H2,which constitutes an important reason for its high activity.This study successfully developed a new type of high-efficiency non precious metal supported hydrodesulfurization catalyst through in-situ regulation of gas small molecules and in-situ growth preparation strategy.The research results of this paper can provide design ideas for the develop-ment of other high-efficiency hydrodesulfurization catalysts.
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