7 results about "Iron oxide catalyst" patented technology

The invention belongs to the technical field of energy chemical industry and catalysis, and discloses a preparation method for preparing synthesis gas through iron-catalyzed methane dry reforming. According to the method, gamma-aluminum oxide is taken as a carrier, ferric nitrate is loaded by adopting an equivalent-volume impregnation method, an iron oxide catalyst is formed through drying and roasting, and metal iron active sites with high dispersity are obtained through hydrogen reduction. The reaction is carried out in a fixed bed reactor, the reaction temperature is controlled to be 650-700 DEG C, methane and carbon dioxide are mixed according to the volume ratio of 1: 1 and introduced into the reactor under the normal pressure condition, and efficient dry reforming is realized to generate synthesis gas. According to the method, the methane conversion rate can reach 85% or above, and the carbon dioxide conversion rate can reach 90% or above. Compared with the existing noble metal or nickel-based catalytic system, the catalyst disclosed by the invention has the advantages of cheap raw materials, simple and convenient preparation process, excellent carbon deposition resistance, capability of keeping high activity and stability at lower temperature, low energy consumption, low cost, strong environmental protection property and suitability for industrial amplification.

The application belongs to the field of functional material preparation and catalysis technology, and discloses a preparation method of an iron oxide catalyst, which comprises the following steps: dissolving an iron precursor and a promoter in water respectively to form uniform aqueous solutions; mixing the two aqueous solution systems and stirring to make them uniformly mixed; continuously heating and stirring the mixed aqueous solution to evaporate water; drying the gel-like substance, and then calcining at a specified temperature for 5h to obtain the iron oxide catalyst. The method of the application obtains the iron oxide catalyst with high catalytic performance by calcining the mixture of the promoter and the iron precursor, and uses the iron oxide catalyst to catalyze the methylation reaction of phenol and methanol. The application improves the conversion rate and selectivity of the reaction by improving mass transfer, increasing the specific surface area and the content of acid sites, and has the advantages of simple operation, good repeatability, low cost, phenol conversion rate of 94.4%, product 2,6-dimethylphenol selectivity of 50.1%, and o-cresol selectivity of 49.2%.

The present invention provides a method for removing hydrogen sulfide (H2S) and hydrogen cyanide (HCN) from concentrated ammonia water, the method comprising: a catalyst treatment step of contacting concentrated ammonia water containing hydrogen sulfide (H2S) and hydrogen cyanide (HCN) with an iron oxide catalyst; and a regeneration step of supplying a regeneration solution to the iron oxide catalyst to regenerate the iron oxide catalyst. According to the present invention, by simultaneously removing hydrogen sulfide (H2S) and hydrogen cyanide (HCN) contained in concentrated ammonia water, it is possible to improve the absorption efficiency of hydrogen sulfide (H2S) and hydrogen cyanide (HCN) of coke oven gas (COG) when using concentrated ammonia water in an H2S scrubber (H2S / S).

The utility model relates to iron oxide catalyst processing technical field discloses a kind of dehydrogenation catalyst iron oxide melting pilot plant, including base, the top left side of the base is fixedly connected with support platform, the top of the support platform is provided with feeding reaction mechanism, the feeding reaction mechanism is used to transport iron oxide raw material, the outer wall of the feeding reaction mechanism is provided with fixed mechanism, the fixed mechanism is used to connect fixed feeding reaction mechanism, the outer wall top of the base is provided with support mechanism, the support mechanism is used to support feeding reaction mechanism, the top of the feeding reaction mechanism is provided with stirring mechanism, the stirring mechanism is used to stir the substance in device. In the utility model, servo motor one drives helical blade conveying shaft rotates in flow guide pipe, flow guide pipe top vibration motor synchronously vibrates, prevent raw material adhesion accumulation, lower fixed ring and upper fixed ring are connected with reaction kettle and sealing kettle cover respectively.

The invention discloses application of a metal catalyst in pyrolysis of polyvinyl chloride and polyethylene glycol terephthalate mixed plastic, and belongs to the technical field of waste plastic recovery. The application method comprises the following steps: putting polyvinyl chloride, polyethylene glycol terephthalate and a catalyst into a reactor, uniformly stirring and mixing, carrying out gas exchange with N2, carrying out pyrolytic reaction at 180-240 DEG C for 5-30 minutes, and after the reaction is finished, carrying out post-treatment to obtain a decomposition product. The efficient catalytic performance of the iron oxide catalyst in PVC / PET pyrolysis is proved for the first time, wherein the iron oxide catalyst has high selectivity, and terephthalic acid and bis (2-chloroethyl) terephthalate with high value can be obtained. The reaction is carried out at 220 DEG C for 7 minutes, and the yield of the PET monomer is up to 88.2%.

The application discloses a preparation method and application of a silicon-doped iron oxide-based ammoxidation catalyst with high N2 selectivity, and belongs to the field of ammoxidation catalysts. The catalyst is prepared by an ethanol solvent-assisted ammonia water-coprecipitation method, which can significantly improve the N2 selectivity while maintaining the ammoxidation activity of the iron oxide catalyst. The silicon doping of the iron oxide can be realized through a simple catalytic synthesis method, and an amorphous iron-silicon composite oxide catalyst is obtained. The novel iron-silicon composite oxide catalyst has the characteristics of large specific surface area and many acid sites, and exhibits good activity and superior N2 selectivity in the ammoxidation reaction. The catalyst can solve the ammonia escape problem of an ammonia selective catalytic reduction (NH3-SCR) module in a diesel vehicle exhaust aftertreatment system, realize efficient oxidation of ammonia, and reduce the generation of nitrogen oxides, and has a wide industrial application prospect.

This invention provides a method for preparing a manganese oxide-based catalyst, comprising the following steps: Step 1): Pre-treating attapulgite to obtain pre-treated attapulgite; Step 2): Coating the pre-treated attapulgite obtained in Step 1) with a first coating agent and drying to obtain dried first-coated attapulgite; Step 3): Coating the dried first-coated attapulgite obtained in Step 2) with a second coating agent and drying to obtain the manganese oxide-based catalyst; the first coating agent comprises carbon materials and nano-manganese dioxide composite iron oxide catalyst; the second coating agent is composed of nano-manganese dioxide composite iron oxide catalyst, COF-LZU1 covalent organic framework, and lanthanide perovskite compound in a mass ratio of 8:(0.5-1.5):(0.5-1.5). The manganese oxide-based catalyst prepared by this invention has good formaldehyde adsorption effect. This invention also provides an application of this manganese oxide-based catalyst in formaldehyde adsorption.