468 results about "Cobalt catalyst" patented technology

A process for the selective production of ethanol by vapor phase reaction of acetic acid over a hydrogenating catalyst composition to form ethanol is disclosed and claimed. In an embodiment of this invention reaction of acetic acid and hydrogen over either cobalt and palladium supported on graphite or cobalt and platinum supported on silica selectively produces ethanol in a vapor phase at a temperature of about 250° C.

Processes for the production of alpha-olefins, including dimerization and isomerization of olefins using a cobalt catalyst complex are provided herein. The olefins so produced are useful as monomers in further polymerization reactions and are useful as chemical intermediates.

A cobalt catalyst on which the distribution of Fischer-Tropsch synthesis is controllable is composed of metallic cobalt and a carrier by the weight percentage of 5-35% and 65-95% respectively. The catalyst is prepared by an impregnation method which aims at different carrier pore paths and pore diameter distribution as well as changes the interaction between the modulator cobalt and the carrier through adding a complexing agent during impregnation to achieve the even distribution of cobalt particle on the carrier surface, thus controlling the distribution of Fischer-Tropsch syntheses. The invention has the advantages of high reactivity and low selectivity of methane and achieving the selective synthesis of the products in the sections with specified carbon number.

A Cobalt catalyst for the Fischer-Tropsch synthesis of Hydrophobic and organic modification comprises an active component, a promoter, a carrier and a grafted hydrophobic radical, wherein the weight percentages of the components are that metal cobalt takes 3-35%, porous silica gel takes 53-96%, noble metal takes 0.01-2%, and the hydrophobic radical takes 0.05-10%. The cobalt nitrate and noble metal nitrate or chloride water solution is applied to impregnate the porous silica gel to produce porous silica gel supported cobalt sample; then the hydrophobic radical on the organosilane are grafted onto the sample surface by applying a back grafting method. The invention can synthesize middle distillate oil (C5-C11 alkane) by the synthesis gas through a high selective step, shorten process flow and reduce production cost.

The present invention relates to a method for deuteration of a compound having an aromatic ring, using an activated catalyst, and the method comprises reacting a compound having an aromatic ring with heavy hydrogen source in the presence of an activated catalyst selected from a platinum catalyst, a rhodium catalyst, a ruthenium catalyst, a nickel catalyst and a cobalt catalyst.

Provided herein is an oligomerization product formed from alpha-olefins having at least three carbon atoms comprising dimers, at least about 80 weight percent of which are linear. In an embodiment, an oligomerization product formed from alpha-olefins having at least three carbon atoms comprises trimers, at least about 20 weight percent of which are linear. In another embodiment, an oligomerization product formed from alpha-olefins having at least three carbon atoms comprises tetramers, at least about 5 weight percent of which are linear. In yet another embodiment, an oligomerization product formed from alpha-olefins having at least three carbon atoms comprises pentamers, at least about 5 weight percent of which are linear.

Novel nickel and/or cobalt plated sponge based catalysts are disclosed. The catalyst have an activity and/or selectivity comparable to conventional nickel and/or cobalt sponge catalysts, e.g., Raney(R) nickel or Raney(R) cobalt catalysts, but require a reduced content of nickel and/or cobalt. Catalysts in accordance with the invention comprise nickel and/or cobalt coated on at least a portion of the surface of a sponge support. Preferably, the sponge support comprises at least one metal other than or different from the metal(s) contained in the coating. The method of preparing the plated catalysts, and the method of using the catalysts in the preparation of organic compounds are also disclosed.

The invention discloses a preparation method of a carbon nano-tube loaded nano-cobalt catalyst. The method comprises the following steps: (1) dissolving a cobalt salt in an organic solvent and then adding a ligand to obtain a mixed liquid; (2) transferring the mixed liquid to a high-pressure kettle, performing a thermostatic heating reaction, naturally cooling to room temperature and then orderly performing filtration, washing and vacuum drying treatment on the generated crystal or powder to obtain a metal organic skeleton product Co-MOF of cobalt; and (3) roasting the metal organic skeleton product Co-MOF for 100-180 minutes at a roasting temperature of 400 DEG C to 1000 DEG C in a calcination atmosphere of argon inside a tubular furnace so as to obtain the carbon nano-tube loaded nano-cobalt catalyst. The preparation method disclosed by the invention has the advantages that the raw materials are low in cost, the production process is also simple, the reaction condition is easy to control, no template agent and surfactant are needed, the prepared product is good in consistency and environment-friendly; and the preparation method is beneficial to batch production and application of carbon nano-tube loaded nano-cobalt.

The present invention provides a one-piece solid golf ball having excellent rebound characteristics and good shot feel, while maintaining excellent processability and durability. The present invention relates to a one-piece solid golf ball formed from a rubber composition comprising a mixture consisting of polybutadiene (a) synthesized using nickel-containing catalyst and polybutadiene (b) synthesized using cobalt-containing catalyst and hydroquinone or derivatives thereof as a vulcanization stabilizer, wherein a Mooney viscosity and a weight ratio of the polybutadienes (a) and (b), an amount of the vulcanization stabilizer, a center hardness (the minimum hardness in the golf ball) and surface hardness of the golf ball, and a difference between the maximum hardness and minimum hardness in the golf ball are adjusted to a specified range.

The invention belongs to the technical field of catalysis and relates to a method for preparing a monatomic cobalt catalyst by roasting silicon dioxide pellets and immobilizing metalloporphyrin. The method is realized by adopting the following technical scheme: namely stirring and dispersing nano silicon dioxide particles, dropwise adding 3-aminopropyl triethoxy silane, so as to obtain amino modified SiO2 pellets, then linking monocarboxyl metalloporphyrin (CoTPCPP) onto an amino modified SiO2 carrier through organic complexing, carbonizing porphyrin through high-temperature calcination in an inert atmosphere, and loading highly dispersed cobalt atoms onto the amino modified SiO2 pellets, thus an amino modified silicon dioxide pellet loaded monatomic cobalt catalyst is obtained. The monatomic dispersion catalyst has high catalytic activity and stability on a molecular oxygen selective ethylbenzene catalytic oxidation reaction in absence of solvent; meanwhile, a preparation method is simple, and product quality can be easily controlled, so that the monatomic dispersion catalyst is applicable to the fields of alkane selective oxidation reactions and synthesis of medical intermediates.

The invention discloses a method for synthesizing gamma-valerolactone based on catalytic hydrogenation. According to the method, levulinic acid or levulinate derivatives in a reaction solvent is/are subject to catalytic hydrogenation for 1-10 hours by adding hydrogen gas and keeping the hydrogen gas pressure at 0.5-5.0 MPa under the action of a supported cobalt catalyst and the temperature of 50-240 DEG C, and the reaction liquid is treated to obtain the gamma-valerolactone. The cobalt catalyst prepared according to the method has excellent catalytic activity and selectivity, the conversion rate of levulinic acid or levulinate is 100 percent, the yield of the gamma-valerolactone reaches up to 99 percent above; and the method has a simple operation technology, and is low in cost, safe and environment-friendly.

The invention relates to a multi-stage hole material cobalt-loaded catalyst, which is made according to the following parts by weight of 5 to 40 percent of cobalt; 0 to 2.0 percent of precious metals, 0 to 2 percent of non-precious metals, 56 percent to 95 percent of silica. The catalyst is made by an isovolumetric immersion method. The catalyst has the advantages of large surface area, enough central holes and large holes, high thermal stability and hydrothermal stability, selective synthesis of long-chain hydrocarbons with different carbon numbers.

The invention discloses an active carbon-loaded nitrogen-doped cobalt catalyst and a preparation method and an application thereof. The catalyst adopts active carbon as a load carrier; a cobalt oxide and a nitrogen-containing compound are doped into the active carbon; the active carbon-loaded nitrogen-doped catalyst can be used for degrading pollutants in organic wastewater; a proper amount of bicarbonate, hydrogen peroxide and nitrogen-doped cobalt catalyst are added into the organic wastewater so as to degrade organic pollutants in the wastewater. A preparation method of the active carbon-loaded nitrogen-doped cobalt catalyst is simple, and the cost is low; the catalytic organic pollutant degrading effect is good, the degrading efficiency is high, and the metal ion dissolving rate is low; the active carbon-loaded nitrogen-doped cobalt catalyst can be repeatedly used.

A supported particulate cobalt catalyst is formed by dispersing cobalt, alone or with a metal promoter, particularly rhenium, as a thin catalytically active film upon a particulate support, especially a silica or titania support. This catalyst can be used to convert an admixture of carbon monoxide and hydrogen to a distillate fuel constituted principally of an admixture of linear paraffins and olefins, particularly a C10+ distillate, at high productivity, with low methane selectivity. A process is also disclosed for the preparation of these catalysts.

The invention discloses preparation of a novel heterogenous catalyst Co (II) (at) TF-TA COF: covalent organic frameworks (COFs)-supported metallic cobalt is used for catalyzing carbon dioxide and an epoxy compound for synthesis of a cyclic carbonate compound. Structural unit of the material contains a cobalt-porphyrin compound which can be used for catalyzing a reaction between carbon dioxide and an epoxy compound. In addition, the COFs have large specific surface area and an open porous structure, which can enhance adsorption capacity of carbon dioxide. Thus, the Co (II) (at) TF-TA COF can simultaneously realize adsorption of carbon dioxide gas and catalytic conversion for generation of cyclic carbonates. The type of a reaction substrate is extensible; reaction yield is high; the catalyst can be recycled; operation is simple; and added value of a product is high.

The invention discloses a preparation method of a nitrogen-doped porous carbon-loaded cobalt catalyst. The preparation method includes: adding N, N-bis(salicylidene) ethylene dimino cobalt (II) or bi(3-methoxysalicylaldehyde) ethylenediamine cobalt chloride into a crucible, placing into a tubular furnace, and heating to 400-900 DEG C for calcining for 1-10 h in a hydrogen-argon mixed atmosphere; cooling to room temperature to obtain the nitrogen-doped porous carbon-loaded cobalt catalyst which is used for hydrolytic dehydrogenation of ammonia borane. The preparation method has the advantages that the catalyst is prepared by adopting a one-step pyrolysis synthesis method, the preparation method is simple, cobalt loading quantity is greatly increased, and industrial production is facilitated; the catalyst is used for catalyzing hydrolytic dehydrogenation of ammonia borane, maximum dehydrogenation rate reaches 1383 mL H2min-1gCo-1, and activation energy is 31.0kJ/mol; especially, after cobalt nanoparticles are embedded in nitrogen-doped porous carbon, circulating stability is improved greatly.

The invention discloses a deep desulfurization method for preparing a synthetic raw material gas by taking a coal-based natural gas, a petroleum refining gas, a coke oven gas, a steel mill converter gas and the like as raw materials. The method comprises the step of enabling the raw material gas which is treated by rough desulfurization and contains hundreds of parts per million (ppm) of H2S and hundreds of ppm of organic sulfur (including COS, CS2, sulfur alcohol, sulfur ether, thiophene and the like) to pass through a plurality of stages of titanium-based molybdenum-cobalt catalysts, a plurality of stages of zinc oxide desulfurizing agents and a stage of multifunctional fine desulfurizing agent to enable the total sulfur to be less than or equal to 0.01ppm. Compared with the existing desulfurization accuracy (0.1ppm), the desulfurization accuracy of the deep desulfurization method enables the degree of purification to be increased by one order of magnitude and enables the service life of a methyl alcohol catalyst to be doubled. The invention also discloses a medium-temperature fine desulfurization device used by the synthetic raw material gas deep fine desulfurization method. For the industrial community, after the method and the device are used, the starting and stopping times of the device can be reduced, the raw material and the power consumption are reduced, the yield of the device is increased, and an effective measure capable of saving energy, reducing emission and increasing yield can be provided.

Linear alpha olefins having from four to twenty carbon atoms and low amounts of oxygenates are synthesized, by producing a synthesis gas containing H2 and CO from natural gas and passing it over a non-shifting cobalt catalyst at reaction conditions of temperature, % CO conversion, and gas feed H2:CO mole ratio and water vapor pressure, effective for the mathematical expression 200-0.6T+0.03PH2O-0.6XCO-8(H2:CO) to have a numerical value greater than or equal to 50. This process can be integrated into a conventional Fischer-Tropsch hydrocarbon synthesis process producing fuels and lubricant oils.

The invention discloses a method for preparing isophorone diamine, wherein the method comprises: using phorone nitrile as a raw material, under an effect of a metal cobalt catalyst, ammonia gas and hydrogen are orderly introduced into an organic solvent, and are reacts under stirring for 1-8h at 40-180 DEG C in a pressure condition of 1-10 MPa, and after reaction, a reaction mixture is post-treated to obtain the isophorone diamine. Uniformly-dispersive and high active metal cobalt catalyst is prepared by a sol-gel method, and when the catalyst is used for preparing isophorone diamine, a conversion rate of IPN can reach 100%, and the yield of IPAD is 78.5-98.3%. The catalyst has a long service life, and after the catalyst repeats eight-time by simple filtration after catalytic reaction, the conversion rate of IPN reduces 6.3%, yield of IPDA reduces 7.8%, and catalyst activity is almost not changed.

An aqueous low temperature oxidation (ALTO) process wherein a catalyst or catalyst precursor constituted of a solids support, or powder component, and a metal, or metals component, inclusive of cobalt, is oxidized, reduced and rendered catalytically active for conducting carbon monoxide hydrogenation reactions. The cobalt catalyst or cobalt catalyst precursor is thus contacted at low temperature with an oxidant in the presence of water (e.g., water to which an oxidant is added), sufficient to oxidize the cobalt metal, or metals component of the catalyst or catalyst precursor. On reduction, the hydrogenation activity of the cobalt catalyst is increased. All or a portion of the cobalt metal of the catalyst precursor is oxidized to form a Co2+ cationic or oxo-anionic species at least during the initial phase of the reaction. On reduction, as may be produced by contact and treatment of the oxidized catalyst or catalyst precursor with hydrogen, or a hydrogen-containing gas, the catalytic metal, or metals component of the catalyst, is reduced to metallic metal, e.g., Co, and the catalyst thereby activated, and/or the catalytic activity increased.

A process for the selective and direct formation of ethanol from acetic acid comprising contacting a feed stream containing acetic acid and hydrogen in vapor form at an elevated temperature with a hydrogenation catalyst comprising cobalt and one or more metals selected from the group consisting of palladium, platinum, rhodium, ruthenium, rhenium, iridium, chromium, copper, tin, molybdenum, tungsten, vanadium, zinc and iron on a catalyst support.