SBA-15 as Support for MoS2 and Co-MoS2 Catalysts Derived from Thiomolybdate Complexes in the Reaction of HDS of DBT

Synthesis, Characterization, and Hydrotreating Activity of NiW Presulfurized Catalysts Prepared via a Tetrathiotungstate-Intercalated NiAl LDH

A tetrathiotungstate-intercalated NiAl layered double hydroxide (LDH) was synthesized and then calcined under N₂ at various temperatures to prepare a series of NiW presulfurized hydrotreating catalysts. Upon calcination, WS₄ ^2- in the interlayer decomposes into WS₃ and then WS₂, releasing sulfur to sulfurize nickel in the sheets. The property and activities of catalysts for hydrodesulfurization (HDS) of dibenzothiophene and hydrodearomatization (HDA) of tetralin are dependent on the calcination temperature. At 300 °C, WS₃ can be well maintained, offering highly active hydrogenation sites S₂ ^2- and superior HDA activity. As the temperature increases up to 500 °C, WS₃ converts into WS₂, while nickel sulfides migrate to the edge of WS₂ to form NiWS phases with high HDS activity. LDH-based presulfurized catalysts can achieve fully sulfurized and well-dispersed tungsten species even at high tungsten loadings and can retain more WS₃ even at high temperatures because of the peculiar properties of LDHs. Therefore, they show better HDS and superior HDA activities over an oxidic NiW LDH-based catalyst (LDO) and an alumina-supported NiWS presulfurized catalyst (NiWS/Al₂O₃). The optimized catalyst shows 1.59 and 1.05 times higher HDS activity than LDO and NiWS/Al₂O₃ while 2.05 and 1.77 times higher HDA activity than LDO and NiWS/Al₂O₃, respectively. It also shows better HDS and HDA activity for a real diesel than a NiCoMoW/Al₂O₃ commercial catalyst.

Remarkable enhancement of the catalytic performance of molybdenum sulfide catalysts via an in situ decomposition method for higher alcohol synthesis from syngas

Through in situ decomposition of (NH₄)₂MoS₄ and introduction of Ni, the resulting disorganized catalysts exhibited remarkably enhanced catalytic performance on higher alcohols synthesis from syngas.

SBA-15 Mesoporous Silica as Catalytic Support for Hydrodesulfurization Catalysts-Review

SBA-15 is an interesting mesoporous silica material having highly ordered nanopores and a large surface area, which is widely employed as catalyst supports, absorbents, drug delivery materials, etc. Since it has a lack of functionality, heteroatoms and organic functional groups have been incorporated by direct or post-synthesis methods in order to modify their functionality. The aim of this article is to review the state-of-the-art related to the use of SBA-15-based mesoporous systems as supports for hydrodesulfurization (HDS) catalysts.