39results about How to "Apply many times" patented technology

A preparation method and application of an in-situ supported metal mesoporous carbon microsphere catalyst, the preparation method comprising: 1) dissolving a metal precursor in ammonia water to prepare a metal ammonia complex solution; 2) taking the metal ammonia complex Solution, ammonia solution, ethanol and deionized water are thoroughly mixed, then resorcinol is added, and formaldehyde solution is slowly added dropwise, and after stirring at 10-50°C for 12-48 hours, the hydrothermal reaction is carried out at 50-200°C for 12 hours. ~36 hours, then centrifuged and washed to obtain a reddish-brown polymer solid powder, and then dried; 3) The polymer solid obtained in step 2) is roasted in a reducing atmosphere containing hydrogen to obtain in-situ supported metal mesoporous carbon microsphere catalyst. The invention provides the application of the catalyst in the selective catalytic hydrogenation of substituted phenols represented by formula (I) to synthesize substituted cyclohexanones represented by formula (II), which has high conversion rate, high catalytic activity, Features of high stability.

The invention discloses a phosphor-modified palladium-supported carbon catalyst and an application thereof. The phosphor-modified palladium-supported carbon catalyst is prepared according to a method which comprises the following steps: (a) taking activated carbon, drying and dewatering; (2) adding hypophosphite into glycol and stirring till full dissolution, thereby obtaining a system A; soaking the dried and dewatered activated carbon into the system A, uniformly stirring, and then standing by for 1-3 days under room temperature and then drying for 6-12h at 100-150 DEG C; placing the sample in a chemical inert gas, increasing the temperature to 350-650 DEG C, keeping constant temperature for 2-10h and lastly reducing temperature to the room temperature, thereby obtaining a phosphor-modified carbon material; (c) preparing a palladium solution; (d) soaking the phosphor-modified carbon material into the palladium solution, stirring and dipping, regulating pH value to 8-10, and then adding a reducing agent for reduction reaction, thereby obtaining the phosphor-modified palladium-supported carbon catalyst. The invention provides the application of the phosphor-modified palladium-supported carbon catalyst in catalytic hydrogenation synthesis of arylamine from aromatic nitro compound. Under the effect of the phosphor-modified palladium-supported carbon catalyst, the selectivity of the arylamine is still above 99.9% under the condition of higher reaction rate and 100% conversion rate of hydrogenation reaction.

The invention discloses the preparation of a sulfur-doped activated carbon-supported noble metal catalyst and its application in the hydrogenation reaction of halogenated aromatic nitro compounds. The preparation method is carried out according to the following steps: (1) The sulfur-doped Miscellaneous activated carbon; (2) Take sulfur-doped activated carbon and add deionized water to form a slurry, add dropwise a soluble noble metal compound solution under stirring, the noble metal is Pd or Pt, stir; then add sodium acetate solution, stir; add alkali dropwise The pH of the solution is adjusted to 7-9, and the stirring is continued; then formaldehyde solution is added dropwise for reduction to obtain a sulfur-doped activated carbon-supported noble metal catalyst. The preparation method of the catalyst of the invention is simple in operation, low in cost, produces little pollution, and is favorable for industrial application. The catalyst is applied to the liquid-phase catalytic hydrogenation of halogenated aromatic nitro compounds to prepare halogenated aromatic amines, has high conversion rate and selectivity, good catalyst stability, and can be recycled and reused many times.

The invention discloses a photothermal catalytic hydrogenation catalyst and its preparation and application in the selective hydrogenation reaction of 3,4-dichloronitrobenzene. The photothermal catalytic hydrogenation catalyst is composed of a mesoporous carbon microsphere carrier and carbon quantum dots and metal quantum dots supported on the surface of the carrier. The catalyst size is between 50 and 100 nm, and the particle size of the carbon quantum dots is in Between 4.5 and 6.5 nm, the metal quantum dots are one or a combination of palladium quantum dots and platinum quantum dots, and the particle size range of the metal quantum dots is between 10 and 15 nm; in the catalyst, carbon The mass fractions of quantum dots and metal quantum dots are 10-30% and 1-2% respectively. The invention provides the photothermal catalytic hydrogenation catalyst used in the selective catalytic hydrogenation of 3,4-dichloronitrobenzene under the irradiation of 280-350nm ultraviolet light to synthesize 3,4-dichloroaniline It has the characteristics of high conversion rate, good selectivity, fast hydrogenation reaction rate and good stability.

The invention provides a method for preparing all-trans vitamin A acetate. The method comprises the following steps: the VA crude oil containing 11-cis vitamin A acetate and 9-cis vitamin A acetate is isomerized under the action of an iodine catalyst to generate all-trans vitamin A acetate, and the iodine catalyst contains an active group Separate iodine and carrier bismuth modified molecular sieves, and use the above-mentioned supported iodine catalyst to efficiently isomerize cis vitamin A acetate, especially 9-cis vitamin A acetate to all-trans vitamin A acetate, and the total conversion rate Up to more than 90%. It has the advantages of low reaction cost, safe and convenient process operation, and high isomerization efficiency.

The invention discloses a photothermal catalytic hydrogenation catalyst and its preparation and application in the selective hydrogenation reaction of p-benzoquinone. The photothermal catalytic hydrogenation catalyst is composed of mesoporous carbon microsphere carrier and carbon quantum dots and metal quantum dots supported on the surface of the carrier. Between ~9.5nm, the metal quantum dot is a combination of one or two of palladium quantum dots and platinum quantum dots, and the particle size range of the metal quantum dots is between 10 and 15nm; in the catalyst, carbon quantum dots The mass fractions of dots and metal quantum dots are 10-30% and 1-2% respectively. The invention provides the application of the photothermal catalytic hydrogenation catalyst in the reaction of selective catalytic hydrogenation of p-benzoquinone to synthesize hydroquinone under the irradiation of 350-400nm ultraviolet light, which has high conversion rate, good selectivity, The hydrogenation reaction rate is fast and the stability is good.

The invention relates to a method for preparing p-aminodiphenylamine, which comprises the following: (1) a step of condensation, in which, nitrobenzene and aniline produce condensation reaction in the presence of a catalyst to generate condensation solution including 4-nitrodiphenylamine and 4-nitrosodiphenylamine; (2) a step of extraction, in which, water phase and organic phase in the condensation solution are separated by an extracting method; (3) a step of reduction, in which, hydrogen and the organic phase of the condensation solution produce reduction reaction in the presence of the catalyst to generate reduction solution including the p-aminodiphenylamine; (4) a step of separation, in which, the p-aminodiphenylamine is separated from the reduction solution to form crude p-aminodiphenylamine feed liquid; and (5) a step of rectification, in which, the p-aminodiphenylamine is separated from the crude p-aminodiphenylamine feed liquid in a rectification mode to form a p-aminodiphenylamine product. The method is suitable for serialized industrialized production in large scale, and has the advantages of low reduction reaction temperature, mild reaction condition, few side products, high conversion rate and selection, low labor intensity and no corrosive liquid, thereby reducing pollution to environment.

The invention discloses a loaded type catalyst and a preparation method and application thereof. The catalyst is prepared from a carrier and an active component loaded on the carrier; the carrier is activated carbon; the active component is prepared from palladium, lanthanum, cerium and boron; mass of the palladium, the lanthanum, the cerium and the boron respectively is 3.0 to 15.0 percent, 0.1 to 5.0 percent, 0.1 to 5.0 percent and 0.1 to 2.5 percent of mass of the carrier. The invention provides application of the loaded type catalyst to a chlorobenzene compound as shown in a formula (I) and an alcohol reaction generation as shown in a formula (II) and phenyl ether compounds as shown in a formula (III). The catalyst prepared by the preparation method has excellent catalytic performance for the chlorobenzene compound, a catalytic conversion rate can reach 100 percent, selectivity is 99 percent or above, and the catalyst has high stability, and not only can effective degradation of the chlorobenzene compound be implemented, but also phenyl ether organic matter with a higher application value can be obtained. (see the descreiption).

The invention discloses a method for synthesizing prenol by composite catalyst. Generally, rare metals high in price and small in number of application times are used in the existing synthetic methods, and accordingly product cost is increased in industrial production, and product competitiveness is lowered. The method for synthesizing prenol by composite catalyst is characterized by using 3-methl-3-butene-1-ol as raw material, using composite catalyst composed of raney nickel and solid super acid, hydrogenating, and subjecting the 3-methl-3-butene-1-ol double-bond isomerization to synthesize prenol. The composite catalyst is easy to obtain, low in cost, large in number of application times, high in conversion rate and selectivity, low in reaction temperature and the like. Reaction temperature is low, and the method is low in energy consumption and meets the technological requirements on energy conservation and consumption reduction.

The invention discloses a supported spherical nano particle palladium catalyst and a preparation method and application thereof .The catalyst is composed of a carrier and an active component supported by the carrier, wherein the carrier is active carbon, alumina, silicon dioxide or titanium dioxide, the active component is elemental palladium, the elemental palladium is a spherical particle in shape, and the particle size ranges from 5 nm to 50 nm .Based on the mass of the carrier, the capacity of the elemental palladium is 0.10-15.0wt% .The application of the catalyst in catalytic hydrogenation reaction of polynitroaromatics shown in formula (I) selectively synthesizing nitro aromatic amine shown in formula (II) is provided .In formula (I), at least two of R1, R2, R3, R4, R5 and R6 are nitryls, and the other groups are independent H, Cl, F, CH3, OH, CH2CH3, NH2, OCH3, OCH2CH3, C6H5, COOH or COOCH3; in formula (II), only one nitryl is reduced into amino, the other groups correspond to the groups in formula (i) in a one-to-one mode and do not change before and after reaction .Please see formula (I) and formula (II) in the description.