Sulfide-based alkane dehydrogenation catalysts
AssigneeHaldor TopsøE A/S
InventorsPoul Erik Højlund Nielsen, Rasmus Munksgård Nielsen, Lived J. Lemus-Yegres
Life of this patent
Estimating the term…
Abstract
A catalyst for the dehydrogenation of alkanes to alkenes comprises a catalytically active material supported on a carrier, wherein the catalytically active material is a metallic sulfide (MeS) comprising Fe, Co, Ni, Cu, Mo or W or any combination of two or more metals selected from Pb, Sn, Zn, Fe, Co, Ni, Cu, Mo and W. The catalyst is regenerated in several steps. The dehydrogenation is carried out at a temperature between 450 and 650° C. and a pressure from 0.9 bar below ambient pressure to 5 bar above ambient pressure.
Claims12
A regenerated catalyst for the dehydrogenation of alkanes to alkenes, said regenerated catalyst comprising a catalytically active material comprising a metallic sulfide (MeS) supported on a carrier, wherein the metallic sulfide (MeS) is a semiconductor, and wherein the catalyst has been regenerated in steps, wherein the steps for regeneration comprise oxidation in diluted air to avoid thermal runaway and to convert the sulfide into the corresponding sulfate and conversion back to the sulfide by reduction in dilute hydrogen comprising hydrogen sulfide.
A process for the dehydrogenation of alkanes to the corresponding unsaturated alkenes and hydrogen (H2) comprising contacting a feed gas comprising an alkane with a catalyst for the dehydrogenation of alkanes to alkenes, said catalyst comprising a catalytically active material supported on a carrier, wherein the catalytically active material comprises a metallic sulfide (MeS), wherein the metallic sulfide (MeS) is a semiconductor, said catalyst being a metallic sulfide supported on a carrier and comprising Fe, Co, Ni, Cu, Mo or W or a combination of two or more metals selected from Pb, Sn, Zn, Fe, Co, Ni, Cu, Mo and W,
- wherein the feed gas contains sulfur in an amount determined such that
- (a) the equilibrium reaction MeS+H2↔Me+H2S is shifted towards MeS throughout the reactor, and
- (b) the sulfur content is sufficient to avoid carbide formation throughout the reactor.
Dependencies are inferred from the claim text.