64results about How to "No significant decrease in activity" patented technology

The invention provides a monatomic iron nitrogen-doped porous carbon catalyst as well as a preparation method and application thereof. In the catalyst, monatomic iron is taken as an active component, a nitrogen-doped porous carbon material is taken as a carrier, and iron is dispersed on the surface and the interior of the nitrogen-doped porous carbon material in a monatomic form, wherein every 100 wt% of the monatomic iron nitrogen-doped porous carbon catalyst contains 1.0-3.0 wt% of iron and 4.0-9.0 wt% of nitrogen. The invention also provides a method for catalyzing a nitrogen heterocyclic compound with the monatomic iron nitrogen-doped porous carbon catalyst for a dehydrogenation oxidation reaction and application of the monatomic iron nitrogen-doped porous carbon catalyst for catalyzing the nitrogen heterocyclic compound for the dehydrogenation oxidation reaction. The catalyst has an excellent catalytic effect; a product is analyzed by GC-MS (gas chromatography-mass spectrometer) after a catalytic reaction is ended; and an analysis result indicates that no by-product is produced, and the activity of the catalyst is not obviously reduced after the catalyst is used for 5 times.

The invention discloses an S-1 full-silicon molecular sieve and a preparation method thereof as well as application of the S-1 full-silicon molecular sieve in caprolactam preparation. The S-1 full-silicon molecular sieve is prepared by the method comprising the following steps: (1) synthesizing a tetrapropylammonium hydroxide template agent; and (2) synthesizing a molecular sieve: carrying out a reaction on tetrapropylammonium hydroxide liquor and tetraethoxysilane and ethanol, filtering, washing with deionized water, drying reaction liquid, roasting, so as to obtain molecular sieve raw powder; adding silica sol, polyethylene glycol 2000, and stronger ammonia water, sesbania powder and activated carbon powder in the molecular sieve raw powder, kneading in a kneader, then carrying out extrusion; roasting, immersing the roasted product in a NH3-NH3NO3 mixing solution and a hydrofluoric acid solution respectively, washing with deionized water, drying, roasting again so as to obtain the S-1 full-silicon molecular sieve. In the invention, the template agent is cheap; the conversion rate of the cyclohexanone and selectivity of the caprolactam are extremely high; a catalyst can be easily and fast regenerated; and the use of concentrated sulphuric acid is avoided, thus the S-1 full-silicon molecular sieve and the preparation method thereof are environment-friendly.

The present invention provides a catalyst for water phase hydrogenation preparation of cyclopentanone from furfural or furfural alcohol and a preparation method thereof, the catalyst is a supported catalyst comprising an active ingredient and a carrier; the active component is one or two substance selected from Cu, Ni, Ru, Pd or Pt; the carrier is a magnetic iron oxide with the formula of FeyOx, wherein the ratio y / x is greater than 2/3 and less than 1; and the mass of the active ingredient 2. 0 to 10.0% of the carrier mass. The present invention also discloses a method for water phase hydrogenation preparation of cyclopentanone from furfural or furfural alcohol by use of the catalyst. The method has the advantages of simple operating steps and easy controlled operating conditions. The synthesized catalyst has good catalytic effect, high cyclopentanone product selectivity, and magnetic property, a magnet is used to attract the catalyst, separation and recovery of the catalyst are facilitated, and the catalyst has good prospects.

The invention relates to a nano-composite quaternary phosphonium salt resin, which mainly solves the problems that in the prior art, catalyst activity is low, resin is easy to swollen, and the activity of the resin is rapidly reduced. A preparation method of the nano composite quaternary phosphonium salt resin comprises the following steps: (1) preparing an aiding agent I into an aqueous solution A; (2) preparing a monomer, a comonomer and a nano material, an initiating agent and an aiding agent II into a solution B; (3) mixing the solution B with the solution A and reacting, thereby obtaining a composite microsphere; (4) adding a chloromethylation reagent and zinc chloride into the composite microsphere, thereby obtaining a composite chlorine sphere; and (5) adding a quaternary phosphorization reagent into the composite chlorine sphere and reacting, thereby obtaining the nano composite quaternary phosphonium salt resin. According to the adopted technical scheme, the problem is solved well. The nano composite quaternary phosphonium salt resin can be applied to the industrial production of alkyl carbonate.

The invention relates to a covalent organic framework material, a preparation method therefor and a method for synthesizing N,N'-di(2,2,6,6-tetramethyl-4-piperidyl)-1,3-benzenediformamide by using thecovalent organic framework (COFs) catalyst. The method comprises the specific steps: subjecting dimethyl isophthalate and 2,2,6,6-tetramethyl-4-aminopiperidine to a heterogeneous catalytic reaction with stirring in an organic solvent by taking the covalent organic framework material (COFs) as a catalyst, and carrying out aftertreatment after the reaction ends up, thereby obtaining the product. The catalyst has sufficient alkaline loci and can be used for effectively catalyzing the reaction and remarkably increasing yield; and after the catalyst is used, treatment steps are simpler, the emission of salt-bearing wastewater is reduced, heavy-metal pollution is avoided, and the catalyst is environmentally friendly.

The invention discloses a floating visible-light-induced photocatalyst capable of degrading organic pollutants in a water body. The floating visible-light-induced photocatalyst uses fly ash floating beads as a carrier, wherein the surfaces of the fly ash floating beads are coated with a BiOBr or/and BiOI material, and a coverage rate is 50 to 100%; and the fly ash floating beads are hollow spherical particles with diameters in a range of 20 to 200 [mu]m and specific gravity of 0.3 to 0.5 g/cm<3>. A preparation method for the floating visible-light-induced photocatalyst loads BiOBr or/and BiOI onto the surfaces of the fly ash floating beads through two steps, i.e., neutralization-hydrolysis and low-temperature insulation treatment, so energy consumption of high-temperature treatment and damage of high-temperature treatment to the structures of the floating beads are avoided, operation time is short and controllable, and implementation and industrial utilization of the preparation method are more easier. The prepared visible-light-induced photocatalyst has low cost, can be repeatedly used, is floatable on the surface of a water body, enables the removal rate of rhodamine B to reach 100% within 40 min, and has good application prospects in treatment of pollutions of surface water bodies, especially in treatment of water bodies with organic pollutants floating on the surface of the water bodies.

The invention relates to a macromolecular supported ternary amino acid Schiff base metallic copper complex catalyst formed by coordination of a macromolecular supported amino acid Schiff base metallic complex and micromolecular ligand. By utilization of the catalyst for catalytic oxidation of ethyl benzene and isopropyl benzene under normal pressure and at a temperature of between 105 and 115 DEG C, the conversion rate of the ethyl benzene is 20 percent, the selectivity of an acetophenone product is 100 percent, and no byproducts are generated; and although the conversation rate of the isopropyl benzene is 25 percent, the selectivity of a product, namely 2-phenyl-2-propyl alcohol (PP) is 100 percent. The catalyst has high activity and selectivity, and simultaneously has the following advantages in an oxidation system: firstly, the catalyst can be separated from a reactant and products through filtration; secondly, an oxidant, namely oxygen, does not pollute the environment; and thirdly, the system does not use any additive.

The invention discloses a preparation method for catalytic synthesis of 4,4'-diaminostilbene. The preparation method comprises the following steps: with a superparamagnetic nanoparticle loaded ionic liquid as a catalyst, subjecting chlorobenzene and thionyl chloride to a Friedel-Crafts reaction under the action of the catalyst, after the reaction is completed, additionally adding a catalyst recovered by a magnetic field, pouring out a reaction solution, dropwise adding a saturated sodium bicarbonate solution into the reaction solution until the pH value of the solution is adjusted to be neutral, then carrying out stirring, filtering the material liquid while the material liquid is hot, cooling a filtrate to 0-5 DEG C for crystallizing, carrying out filtering so as to obtain 4,4'-dichlorodiphenyl sulfoxide, dissolving the 4,4'-dichlorodiphenyl sulfoxide into glacial acetic acid, adding hydrogen peroxide for an oxidation reaction, carrying out cooling after the reaction is finished, andcarrying out filtering so as to obtain 4,4'-dichlorodiphenyl sulfone. According to the invention, the chlorobenzene is used as a reaction raw material and a solvent; no solvent impurities are not mixed; meanwhile, simple process, low cost and few impurities are achieved; an obtained product is high in purity and has a content of 99.2% or above; the content of a 2,4'-isomer is smaller than 0.1%; the yield reaches 90% or above; and the preparation method provided by the invention is good in economic benefit and applicable to industrial production.

The invention discloses a carboxyaryl functionalized MXene material. The carboxyaryl functionalized MXene material has a Mn+1Xn-Ph(COOH)2 structure, wherein M is any one or at least two metal elementsin the IIIB group, the IVB group, the VB group, the VIB group and the VIIB group; X is any one or a combination of two of C and N elements; and n is 1, 2 or 3. The carboxyaryl functionalized MXene material has strong complexing ability with heavy metals, and can catalyze the reaction of synthesizing phenol from arylboronic acid, thereby avoiding the use of hydrogen peroxide and enhancing the safety of the synthesis method. The invention also discloses a preparation method of the carboxyaryl functionalized MXene material, which comprises the following steps: carrying out alkaline hydrolysis onthe MXene material, and carrying out a diazotization reaction on the hydrolyzed MXene material and aminobenzenedicarboxylic acid to obtain the carboxyaryl functionalized MXene new material. The preparation process is simple, feasible and mild in condition. The invention also discloses an application of the carboxyaryl functionalized MXene material in wastewater purification and catalysis of in-situ hydroxylation of arylboronic acid to synthesize phenol. The invention also discloses a carboxyaryl functionalized MXene material supported palladium catalyst as well as a preparation method and anapplication thereof.

The invention relates to a sewage purifying photolysis water hydrogen generation double-function environment-friendly carbon nitride photocatalyst and a preparation method and application thereof. Thecatalyst is prepared by taking a cyanamide compound or a nitrogen-enriched carbon-containing substance as a precursor and micro/nano inorganic salt as a template agent. The preparation method includes: physically mixing the precursor with the template agent different in proportion, and performing high-temperature calcining, template moving, washing and calcining to obtain a porous-structure catalyst. The catalyst is environment-friendly, low in cost, high in chemical and thermal stability and high in pollutant extruding efficiency.

The invention relates to a method for splitting S(+)-ibuprofen shown in the split formula I. The method comprises the following steps: 1) performing an asymmetric ester exchange reaction with alcohol by taking (R, S)-methyl ibuprofen as a raw material and an immobilized lipase as a catalyst, and performing post-treatment to obtain S(+)-methyl ibuprofen; and 2) hydrolyzing the S(+)-methyl ibuprofen obtained in the step 1) in the catalysis of inorganic acid to obtain S(+)-ibuprofen. The raw materials in the preparation method provided by the invention are easily available, the yield is high, the optical purity of products is high, the pollution is low, and the method is suitable for industrial production.

The invention discloses a photocatalyst of a shell-core structure as well as a preparation method thereof and application thereof, and belongs to the technical field of visible light photocatalysis. The photocatalyst of the shell-core structure takes Fe3O4 as the core, a NiAl-LDHs layer is coated outside the Fe3O4 core to form Fe3O4@LDHs, and a Bi2MoO6 layer is coated outside the Fe3O4@LDHs. The photocatalyst takes Fe3O4 as the core, and can improve a current condition of stacking and superposing hydrotalcite to epose more active sites. The NiAl-LDHs is compounded with Bi2MoO6 to form a heterojunction material, so that photocatalytic performance of Bi2MoO6 is improved, and forbidden bandwidth of the two is regulated, and therefore, the photocatalyst has ultraviolet-visible dual response, and can effectively improve a compounding rate of a photogenerated hole and electrons. The photocatalyst has very high stability and a very high degradation rate of degrading organic pollutants, and isnot obviously reduced in activity after being circulated for more than 5 times.

The invention provides a preparation method of a photocatalyst. The method comprises the following steps that cinnamomum camphora leaves are washed, dried and pulverized into powder; the powder smaller than 200 meshes is taken for later use; plant leaf powder is added into water; oscillation is performed in a shaking table; filtering is performed to obtain plant extracting liquid; a silver nitrate water solution and a chloroauric acid water solution are prepared; gold and silver bi-metal nanoparticles are prepared by mainly using the cinnamomum camphora leaf extracting liquid as a protection agent and a reducing agent; the bi-metal nanoparticles are prepared by a substitution method and a coreduction method at normal temperature; the nanoparticles are loaded on a titanium dioxide carrier for degrading dye such as methyl orange, methylene blue and rhodamine B; the condition that the dye is basically and completely degraded within 1h is found. When the catalyst is subjected to ionic liquid extraction and roasting treatment, the catalytic activity can be shortened within 30 minutes, and is superior to the results reported in most literatures. In addition, the photocatalyst is sunk at the bottom of a container after being used; through simple solid-liquid separation and roasting treatment, the activity is not obviously lowered; good application prospects are realized.

The present invention discloses a synthesis method of 3-methyl-2-en-4-yn pentanol through acid ionic liquid catalysis. The synthesis method comprises that in the presence of water and an acid ionic liquid, 3-methyl-1-en-4-yn-3-pentanol is subjected to an isomerization reaction, and post-treatment is performed after completing the reaction to obtain the 3-methyl-2-en-4-yn pentanol. According to the present invention, with the synthesis method, the defects of the traditional 3-methyl-1-en-4-yn-3-pentanol catalytic translocation process can be overcome, the reaction conditions can be alleviated, the yield of the reaction can be improved, the catalyst circulation application can be achieved, the wastewater production can be reduced, and the environment is effectively improved.

The invention relates to a method for preparing alkylene carbonate, and is mainly used for solving the problems that in the prior art, the catalyst is low in activity and easy to inactivate, and the product is hard to separate. The catalyst provided by the invention has the structural formula of M-PEG-Z<+>R3X<->, wherein M is a resin matrix selected from polyalkylene ester, copolymer of phenylethylene and divinyl benzene, polyester, polycarbonic ester, polyurethane or formaldehyde resin; PEG represents a chemical structure with the formula -(CH2CH2O)n-, and n is an integer from 1 to 150; Z is nitrogen, phosphorus or arsenic; R is methyl, ethyl, propyl, n-butyl, phenyl or aryl; and X is fluorine, chlorine, bromine, iodine, acetate, formate or hydrogen oxalate. The problems are better solved with the adoption of the technical scheme, and the method can be applied to industrial production of alkylene carbonate.

The invention discloses application of an ionic liquid in bromoethane preparation, belonging to the fields of green chemistry and new materials. Under the action of the ionic liquid, hydrobromic acid and ethanol are subjected to substitution reaction; and after the reaction finishes, after-treatment is performed to obtain the bromoethane. The ionic liquid is composed of cations X<+> and anions Y<->, wherein the cations are imidazole, pyridine, pyrrolidone and other cations containing nitrogen heterocyclic ring, and the anions are various functionalized anions with catalytic action. The ionic liquid is used for preparing the bromoethane, thereby avoiding using the traditional concentrated sulfuric acid, enhancing the reaction efficiency, avoiding generating waste acid and being beneficial to environmental protection. The ionic liquid can be recovered, and is a high-efficiency green synthesis means.

The invention relates to a method for preparing diphenyl carbonate through dimethyl carbonate and phenol ester exchange reaction. The method mainly solves the problem of low activity of a heterogeneous catalyst in the prior art. A catalyst used in the method is titanium oxide with a (001) crystal face exposed at a high ratio. By means of the technical scheme, the activity and selectivity of the catalyst are effectively improved, the problem of low activity of the catalyst in the reaction of synthesizing the diphenyl carbonate through phenol and dimethyl carbonate ester exchange is well solved,and the method can be used for industrial production of the diphenyl carbonate.

The invention relates to a method for synthesizing ethyl trifluoroacetate. Raw materials in the method for synthesizing ethyl trifluoroacetate include trifluoroacetic acid and anhydrous ethanol, and acatalyst is a solid acid catalyst. The method provided by the invention is simple in process, low in equipment requirement, and thorough in reaction, with the purity of 99.5% or above, and the molaryield of 98.0% or above. The solid acid catalyst can be recycled after being dried, and the activity is not significantly decreased, so that the using amount of the catalyst is small. The overall costof the method provided by the invention is controlled to be relatively low, thus being suitable for industrial production.