3 results about "Oxidative carbonylation" patented technology

This invention relates to a (FeIn) / ZSM-5 catalyst, comprising a ZSM-5 molecular sieve support and an active component supported on the ZSM-5 molecular sieve; the active component is a Fe species and an In species, with the Fe loading in the catalyst being 0.1~1.0 wt% and the In loading being 0.25~1.5 wt%. The invention also discloses a method for preparing the catalyst and its applications. This invention employs a "molecular anchoring" strategy, introducing a second metal, indium. Utilizing the stronger electronic interaction between indium and aluminum in the molecular sieve framework, the migration and aggregation of iron during preparation and reaction are effectively suppressed, significantly increasing the proportion of mononuclear iron in the (FeIn) / ZSM-5 catalyst and promoting the yield of the target product, acetic acid, in the methane oxidative carbonylation reaction.

This invention discloses a method for the direct oxidative carbonylation of methane to prepare acetic acid. Specifically, this invention provides a catalytic method for the preparation of acetic acid from methane, comprising the following steps: under solvent conditions, in the presence of light, an iron catalyst, chloride ions, and an oxidant, methane and carbon monoxide undergo a methane oxidative carbonylation reaction to obtain acetic acid. This method utilizes readily available methane, carbon monoxide, and air (or oxygen), employs an iron catalyst, and achieves direct, efficient, and highly selective acetic acid production via a one-step photocatalytic reaction, demonstrating promising application prospects. The substrate scope of this invention is broad, applicable to a range of chain and cyclic alkanes.

The invention discloses a cobalt-based catalyst and a preparation method and application thereof, the cobalt-based catalyst is obtained by at least taking a cobalt-based precursor and an organic nitrogen source as raw materials through in-situ carbonization treatment; wherein the raw materials of the cobalt-based precursor at least comprise a cobalt salt, a zinc salt and an imidazole organic ligand. The preparation method comprises the following steps: dissolving cobalt salt and zinc salt in water to obtain a metal salt aqueous solution; the preparation method comprises the following steps: dissolving an imidazole organic ligand in water to obtain an imidazole organic ligand aqueous solution; the preparation method comprises the following steps: mixing a metal salt aqueous solution and an imidazole organic ligand aqueous solution, heating, aging, collecting a solid product, washing and drying to obtain a catalyst precursor; and mixing the catalyst precursor with an organic nitrogen source, and carrying out in-situ carbonization treatment to obtain the catalyst. The cobalt-based catalyst shows excellent catalytic activity and selectivity in the methanol oxidative carbonylation reaction, has good reaction stability, can still keep high methanol conversion rate and DMC selectivity after being recycled for five times, and has good industrial application potential.