Simultaneous tetralin HDA and dibenzothiophene HDS reactions on NiMo bulk sulphide catalysts obtained from mixed oxides

Simultaneous tetralin HDA and dibenzothiophene HDS reactions on NiMo bulk sulphide catalysts obtained from mixed oxides

Type	Journal Article
Author	Yordy E. Licea
Author	Sandra L. Amaya
URL	http://pubs.rsc.org/en/content/articlelanding/2014/cy/c3cy00801k
Volume	4
Issue	5
Pages	1227-1238
Publication	Catalysis Science & Technology
Date	2014-04-07
Abstract	Researchers obtained NiMo bulk sulphide catalysts from mixed-oxides. They obtained mixed-oxides by calcining the lamellar precursor with the ϕy structure and (NH4)H2xNi3−x(OH)2(MoO4)2 formula. The corresponding mixed-oxides were characterized by nitrogen adsorption, XRD, and ICP. Mixtures of α-NiMoO4 and β-NiMoO4 were obtained. Researchers employed a batch reactor for CS2/n-hexadecane in situ sulphidation of the mixed-oxides. They used a mixture of dibenzothiophene and tetralin for the liquid phase reaction carried out at 613 K and 70 bar. The EXAFS simulations are consistent with disordered nickel sulphide particles dispersed in the catalysts. HR-TEM images exhibited randomly oriented, stacked-layer particles typical of Mo sulphide. The bulk catalysts had larger HDS and HDA activities and selectivities for hydrogenation reactions than alumina supported conventional catalysts containing the same Ni:Mo ratio. They noted a pronounced support effect for both HDS and HDA reactions. The use of the support strongly suppressed both cyclohexylbenzene formation in HDS of DBT and cis-decalin formation in HDA of tetralin. This would indicate that similar active sites are involved in the formation of these compounds on the one hand, while another type of site is involved in biphenyl and trans-decalin formation on the other.