6 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 relates to a preparation method and application of a cellulose-derived porous carbon supported copper catalyst, and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps: taking microcrystalline cellulose as a raw material, dipping and activating the microcrystalline cellulose in a zinc salt solution, carbonizing the microcrystalline cellulose at a high temperature of 900-1000 DEG C and washing the microcrystalline cellulose with nitric acid to prepare cellulose-derived porous carbon as a catalyst carrier, obtaining a micropore-rich carbon material containing mesopores by using zinc nitrate, and obtaining the micropore-rich carbon material by using zinc chloride; and loading a copper species on the catalyst carrier by adopting an equivalent-volume impregnation method, and reducing at 350-400 DEG C to obtain the cellulose-derived porous carbon loaded copper catalyst. The prepared cellulose-derived porous carbon supported copper catalyst has the advantages of large specific surface area, high dispersion of copper particles and the like, and shows excellent catalytic performance in the reaction of catalyzing methanol oxidative carbonylation to synthesize dimethyl carbonate, the highest methanol conversion rate can reach 9.0%, and the selectivity of dimethyl carbonate is 98% or above.

The invention discloses a catalyst for producing aryl acetic acid through oxidative carbonylation of methyl aromatic hydrocarbon and a preparation method and application of the catalyst, the catalyst is composed of solid acid and metal oxide for modifying the solid acid, the metal oxide is an oxide corresponding to the highest valence of metal, and the metal is one of cobalt, nickel, copper and iron elements; the mass of the catalyst is 100%, the metal oxide accounts for 0.1-20% of the mass of the catalyst, and the balance is the solid acid. The catalyst provided by the invention is simple to synthesize, is beneficial to large-scale preparation, and has good activity and stability; when aryl acetic acid is produced, a fixed bed reactor is adopted, operation is easy, continuous and large-scale production is facilitated, and the reaction process is high in atom economy and environmentally friendly.

The invention discloses a preparation method of a catalyst for preparing dimethyl carbonate through oxidative carbonylation of methanol. The catalyst comprises the following components (in terms of oxide, a carrier is 85.0 to 92.5 wt% of Al2O3, 5.0 to 11.0 wt% of MgO, 0.1 to 1.0 wt% of Na2O, 1.5 to 3.5 wt% of a Cu-containing compound and 0.5 to 1.5 wt% of a Pd-containing compound. Alpha-beta aluminum oxide added during molding reduces the acidity of the carrier and improves the heat-conducting property of the carrier, and a magnesium-containing compound is added before strip extrusion to modify the carrier, so that the structural stability and the mass transfer property of the catalyst are improved. The catalyst prepared by adopting the technology of the patent is weak in acidity, high in active component dispersity and smooth in catalyst pore channel, and has excellent activity and selectivity when being used for preparing a dimethyl carbonate catalyst through methanol oxidative carbonylation.

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.