37results about How to "Efficient catalytic reaction" patented technology

The invention relates to a preparation method for a denitrified catalyst which has a nanometer multi-wall spherical structure and takes spinel double-metal oxide as an active component, and belongs to the fields of nanomaterial preparation technique and environment protection technology. The preparation method mainly comprises the steps: by taking carbon spheres, synthesized by various carbon precursors through hydrothermal reaction, as templates, firstly, evenly dispersing in an ethanol / water mixed solution in which various metal precursors are dissolved, then aging in a solution so as to realize the full adsorption of metal ions, finally drying, controlling temperature and calcining and the like, thus obtaining the spinel-state denitrified catalyst with high specific surface area and high activity. Proved by tests, the catalyst has wider catalytic temperature windows. Therefore, the catalyst can be used for selective catalytic reduction of nitrogen oxide in smoke emitted from a diesel engine tail gas, a coal-fired power plant, a steel mill and the like.

The invention relates to a multifunctional chiral amin compound, a preparation method and an application of the multifunctional chiral amine compound in an asymmetric Michael addition reaction of alpha, beta-unsaturated ketone and 2(5H)-furaneol. A general formula of the multifunctional chiral amine compound is shown in the description, wherein R1, R2, R3, and R4 are each differently or similarly selected from an alkane substituent or an aromatic substituent, R5 is selected from sulfuryl or sulfinyl or amide substituent. The multifunctional chiral amine compound and salts thereof provided by the present invention have wide applications, for example, the multifunctional chiral amine compound and the salts thereof can be adopted as chiral catalysts for the asymmetric Michael addition reaction. Especially that the chiral amine salt provided by the present invention provides high catalytic activity and high stereoselectivity for the asymmetric Michael addition reaction of the alpha, beta-unsaturated ketone and the 2(5H)-furaneol, wherein diastereoselectivity is up to 30 / 1, enantioselectivity is up to 99%, and reaction substrate scope is wide.

The invention relates to a preparation method of a 3,5-disubstituted thiazolidine-2-thioketone compound. The preparation method comprises the following steps of enabling an aziridine compound as shownin a formula (I) and carbon disulfide to be subjected to a reaction under the action of a catalyst, and obtaining the 3,5-disubstituted thiazolidine-2-thioketone compound as shown in a formula (II),wherein the catalyst is acylamino bivalent rare earth metal amide; the reaction is carried out in an anhydrous and oxygen-free inert atmosphere; the reaction route is as shown in the attached figure;wherein R1 is selected from hydrogen, C1 to C4 alkyl groups, an alkoxy group or halogen; the halogen is chlorine or bromine; R2 is selected from C1 to C4 alkyl groups, a benzyl group or a cyclohexyl group. The method provided by the invention is less in catalyst dosage, mild in reaction conditions, good in substrate universality and capable of synthesizing target products with high yield.

A carried alkali-metal catalyst for synthesizing biologic diesel oil by exchange reaction of the fatty-acid ester is prepared from alkali-metal salt (LiNO3, NaNO3, or KNO3) or alkali-metal hydroxide (LiOH, NaOH, or KOH) and alkali-earth metal oxide (Cao, SrO, or BaO) through preparing the salt (or alkali)-soluble aqueous solution of alkali-metal salt (or hydroxide), immersing alkali-earth metal oxide in it, ageing, evaporating solvent, baking and grinding.

The invention discloses a chiral amine compound derived from tert-leucine and its preparation method and application. The chiral amine compound contains a tert-butyl group, a primary amine, a secondary amine or a tertiary amine functional group, Its structural formula is:; the chiral amine and its salt use widely existing chiral tertiary leucine as a raw material, and the chiral amine compound is obtained through simple preparation steps; the chiral amine or salt of the present invention can be used for α, β -Asymmetric Michael addition reaction of unsaturated ketones with nitromethane, malonate, substituted oxazolone and other nucleophiles, which can be used for α, β-unsaturated ketones and 5-unsaturated rhodanine, 5-unsaturated Asymmetric tandem reaction of saturated hydantoin and α, β-unsaturated ketones; it has high catalytic activity and stereoselectivity, with anisotropic selectivity up to 30 / 1 and enantioselectivity up to 99%. The reaction substrate wide range.

The invention relates to a chiral acyclic secondary amine-tertiary amine catalyst derived from amino acid and a preparation method and application thereof, and belongs to the technical field of catalysts. The catalyst has an acyclic secondary amine and a tertiary amine functional group, a structural formula is shown in the description; the catalyst is made of a cheap and easy-to-obtain alpha-aminoacid derivative, and a novel chiral acyclic secondary amine-tertiary amine compound is obtained through simple preparation steps; the catalyst can be used for catalyzing asymmetric Aldol reaction between acetaldehyde and isatin ketone, and can also be used for catalyzing asymmetric Mannich reaction between acetaldehyde or alpha-substituted aldehyde and isatin ketone; high catalytic activity and stereoselectivity are provided, diastereoselectivity is as high as 20:1, enantioselectivity is up to 96%, reaction substrates are wide, and the method is easy to popularize and apply.

The invention relates to an enzyme imitation type water treatment agent for degrading polycycic / heterocyclic aromatic hydrocarbon, and a preparation method for the enzyme imitation type water treatment agent. The technical scheme comprises the following steps of: uniformly mixing bentonite and deionized water in a mass ratio of 1:(30-60), standing, and taking an intermediate layer to obtain purified bentonite; mixing the purified bentonite and NaCl in a mass ratio of 1:(1-2.5), and stirring for 30 to 60 minutes to obtain sodium-activated bentonite; adding 1.5 to 5.0 weight percent of sodium-activated bentonite slurry into an aluminum crosslinker until the volume ratio of the sodium-activated bentonite slurry to the aluminum crosslinker is (4-7):1 to obtain aluminum pillared bentonite; andmixing aluminum pillared bentonite, deionized water, and hexadecyltrimethylammonium bromide in a mass ratio of 1:(40-100):(0.1-0.4), adding ferrous sulfate and ferric trichloride until the molar ratio of Fe<2+> to Fe<3+> is 1:(1.5-3), introducing nitrogen, stirring at the temperature of between 60 and 80 DEG C for 10 and 15 minutes, and adjusting pH to be 9 to 12 to obtain the enzyme imitation type water treatment agent for degrading polycycic / heterocyclic aromatic hydrocarbon. The enzyme imitation type water treatment agent has the advantages of high removal efficiency, low cost and environment-friendliness, and can be recycled.

The invention discloses a preparation method of silk nano globules coating an enzyme. The preparation method comprises the following steps of: S1: preparing a silk solution; and S2: wrapping the enzyme into the silk to form the silk nano globules coating the enzyme. The prepared silk nano globules can be applied to the medical field, and in particular to an antialcoholic drug. The silk nano globules prepared by the method can effectively protect the activity of the wrapped enzyme to realize cascade reactions of various enzymes, and meanwhile have good biocompatibility.

The present invention is applicable to the technical field of rosin processing. The present invention provides a preparation method of rosin resin and its processing equipment. In the preparation method of rosin resin in the present invention, nano alumina is modified as a carrier, so that the nano Alumina has a good carrying capacity, which is conducive to carrying silica. By using silica as a carrier, the catalytic reaction can be carried out well, and at the same time, it can absorb impurities in rosin resin, which is beneficial to lighten the color of rosin resin; In the preparation process of the rosin resin in the invention, by adding an antioxidant, the rosin resin can be effectively prevented from being oxidized, the color of the rosin resin can be further lightened, and the thermal stability of the rosin resin in the present invention can be effectively improved at the same time; the present invention The processing equipment of rosin resin has good thermal insulation effect, which is beneficial to the reaction.

The invention discloses a solid alkali preformed catalyst for biodiesel. The solid alkali preformed catalyst is prepared in the way that papermaking sewage sludge ash is ground, sieved, activated under high temperature and then added to a sodium metasilicate solution, uniform stirring, impregnation and extrusion for anhydration are conducted, then the product is added to a sodium metasilicate solution, and uniform stirring and impregnation are conducted to obtain an impregnation material; clay is added to the impregnation material, and uniform mixing, extrusion forming, drying to a constant weight and calcination are conducted to obtain the solid alkali preformed catalyst for biodiesel. The solid alkali preformed catalyst for biodiesel is high in catalysis activity, the yield of biodiesel is increased, recycle of the waste resource papermaking sewage sludge is achieved, production cost is reduced, and application prospects are broad.