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

Abstract

Large selectivity differences were found between supported and unsupported NiMoS catalysts in dibenzothiophene HDS and tetralin HDA.

Biological Evolution of New Intercalated Layered Double Hydroxides: Anticancer, Antibacterial and Photocatalytic Studies

“…The peaks at 2θ=60.1 (110), 61.5 (113) and 63.5 (103) were merged due to the replacement of excess of water molecules by the guest SNBS. From the Scherrer equation , …”

Unsupported trimetallic Ni(Co)-Mo-W sulphide catalysts prepared from mixed oxides: Characterisation and catalytic tests for simultaneous tetralin HDA and dibenzothiophene HDS reactions

“…Two series of AMoW (A = Ni or Co) precursors were synthesised by a co-precipitation method as described elsewhere [31]. Ammonium heptamolybdate and ammonium metatungstate aqueous solutions were prepared each containing quantities of Mo and W to obtain 1:0, 2:1, 1:1, 1:2 and 0:1 molar Mo:W solutions.…”

“…The NiMo layered precursor (Ni1.6-Mo-am), its corresponding mixed oxide (Ni1.6-Mo-ca) and sulphided catalyst (Ni1.6-Mo-s) have been studied in previous work [31], where the simultaneous HDS/HDA activity of the latter was compared with that of an aluminasupported NiMo material synthesised in our laboratory [36].…”

“…Recently Licea et al [31] have investigated the properties of NiMo bulk sulphide catalysts obtained from mixed oxides. The mixed oxides were obtained by calcining a synthesised lamellar precursor with the so-called y phase, whose crystal structure has been determined by Ying et al [31], with general formula (NH4)H2xNi3-x(OH)2(MoO4)2 (0 ≤ x ≤ 3/2). Ni atoms can fractionally occupy the octahedral sites, which allows the synthesis of compounds with Ni/Mo ratios in the range from 0.75 to 1.5.…”

“…It is well known that DBT undergoes HDS by two parallel paths, namely the direct desulphurization (DDS) and the previous hydrogenation (HYD) routes [34]. In the work of Licea et al [31] the mixed oxides were in situ sulphided and the catalytic activity of the mixed sulphides was evaluated in the simultaneous dibenzothiophene (DBT) HDS and tetrahydronaphthalene (THN) HDA reactions. The NiMo bulk sulphide displayed pronounced selectivity for the HYD pathway in DBT HDS, when compared to a conventional NiMo alumina-supported catalyst.…”