49results about How to "Achieve a high degree of dispersion" patented technology

The invention relates to a phosphor and rare earth modified molecular sieve, which contains 15-30% of Zn or Mg, 0.1-10wt% of P and 0.1-10wt% of La and/or Ce. A aluminum source on the molecular sieve surface is used, Zn(Mg)/Al/La(Ce) ternary hydrotalcite of carbonic acid radical pillared is subjected to in situ synthesis, an ion exchange method is used for preparing hydrotalcite of phosphoric acid dihydro radical pillared, a program temperature-raising calcination method is used, P2O5, La2O3 or Ce2O3 is highly dispersed on the surface and tunnel of the molecular sieve, thereby the acidity of the molecular sieve is enhanced. A hydrotalcite precursor method is used for modifying the molecular sieve, high dispersion of an active group is realized, the acidity and the stability of the molecular sieve can be substantially improved, and the molecular sieve provides a material possessing practical application value for heavy oil catalytic cracking catalysts.

The invention provides an amino metal organic framework material containing an active metal component. The amino metal organic framework material is used as a carrier; and the active metal component is dispersed in the carrier, wherein the weight of the active metal component is 0.05-15% of that of the amino MOFs material. According to the invention, a mixed solution is formed from the carrier and an active metal precursor containing a carbanyl group; amino in the MOFs material is reacted with the carbanyl group in the active metal precursor, so that the active metal precursor is connected to the MOFs material; then, the material is prepared through a reduction method; uniform dispersion of the active metal component in the MOFs material is realized; when the material is used as the catalyst, the catalytic effect is obvious because of high dispersion of the active component, for example, the amino metal organic framework material is used in a process for preparing aromatic amine by hydrogenation reduction of an aromatic nitro compound, etc.

A phosphor and rare earth composite modification method of a molecular sieve comprises that an aluminum source on the surface of the molecular sieve is utilized for in situ synthesis of carbonate-ion-pillared Zn (Mg)/Al/La (Ce) ternary hydrotalcite; that dihydrogen-phosphate-ion-pillared hydrotalcite is prepared by employing an ion exchange method; and that a program heating calcination method is used to make P2O5, La2O3 or Ce2O3 be highly dispersed in the surfaces and pores of the molecular sieve, thereby improving the acidity of the molecular sieve. According to the method of the invention, the molecular sieve modified by hydrotalcite precursor method not only realizes high dispersion of active components, but also greatly improves the acidity and the stability of the molecular sieve, thereby providing a material with practical application values for preparing catalyst for catalytic cracking of heavy oil.

The invention provides an in-situ sulfur-doped mesoporous carbon supported palladium metal catalyst, and a preparation method and application thereof. A required carrier material is directly obtainedby adopting a method of direct hydrothermal carbonization and calcination for further carbonization, so that sulfur can be doped into a skeleton of a carbon material and exists in a more stable form.In the sulfur-doped activated carbon supported noble metal catalyst, a large number of defects generated by doping are more beneficial to stable combination of palladium metal nanoparticles and the carrier, and strong interaction between sulfur and metal ensures high stability of the catalyst, so that metal nanoparticles are not easily agglomerated or lost in a hydrogenation reaction process, andthe service life of the catalyst is prolonged. Through the catalyst, halogenated nitrobenzene can be completely converted in a selective hydrogenation reaction of the halogenated nitrobenzene, and thehalogenated aniline selectivity can achieve 99.9%. In addition, the use condition is mild, stability is good, the use amount of the catalyst is less, and the service life of the catalyst is long.

The invention discloses a preparation method and application of a Cu/N doped carbon nanosheet catalyst with high stability. The preparation steps include: first, weighing raw materials of magnesium citrate, potassium citrate and ammonium oxalate in a mass ratio of 1:(2-8):(1-16) to prepare an N-doped carbon nanosheet; and then, preparing a N-doped carbon nanosheet copper-carrying salt precursor, and finally, carrying high-temperature roasting to obtain the Cu/N doped carbon nanosheet catalyst with high stability. The obtained catalyst has multilevel pores in which micropores, mesopores and macropores coexist and has a nanosheet structure, and Cu nanoparticles are uniformly dispersed on the carrier; in addition, the multilevel porous nanosheet structure is rich in carbon vacancies, and at lower temperatures (70-300 DEG C), more carbon vacancies can be excited to anchor the Cu nanoparticles, so that the Cu nanoparticles are redispersed into single atoms and atomic clusters of -0.91 nm. The Cu/N doped carbon nanosheet catalyst can also be used in oxidative carbonylation of carbon monoxide to synthesize dimethyl carbonate.

The invention relates to the field of fuel cells, and particularly discloses catalyst slurry for a fuel cell, a preparation method of the catalyst slurry and a membrane electrode. The preparation method of the catalyst slurry for the fuel cell comprises the following steps of S1) carrying out ultrasonic dispersion treatment on a perfluorosulfonic acid solution at 50-90 DEG C to obtain a perfluorosulfonic acid dispersion liquid; and S2) mixing the perfluorosulfonic acid dispersion liquid with a catalyst, a dispersing agent and deionized water, and emulsifying and dispersing to obtain the fuel cell catalyst slurry. By utilizing the preparation method, the problem of uneven dispersion of the proton conduction ionomer in the existing catalyst slurry can be solved, and the preparation method isused for improving the dispersity of the proton conduction ionomer in the catalyst slurry.

The invention belongs to the field of metal sulfide nano-materials, and particularly relates to a method for preparing a carbon-loaded metal sulfide nanocomposite through electrostatic spinning, whichcomprises the following steps: (1) preparing a spinning precursor solution: respectively dissolving a thiacalixarene metal cluster compound and a spinning aid in DMF (Dimethyl Formamide), and mixing;(2) preparing nano-fibers by electrostatic spinning: sucking the obtained spinning precursor solution into an injector, adjusting the pump flow rate and voltage of the injector and the distance between a spinning needle and a receiving plate, spinning, and receiving a nano-fiber felt by the receiving plate; (3) pre-oxidizing the nano-fiber felt: pre-oxidizing the collected nano-fiber felt; and (4) carbonizing in an N2 atmosphere: carbonizing the pre-oxidized nano-fiber felt, and naturally cooling to obtain the target product. The target product is ideal in electrochemical performance and goodin capacitance characteristic, the flaky carbon material is directly used as an electrode, additives or impurities such as a binding agent can be eliminated, and the energy capacity and performance are improved.

The invention relates to the field of electrolytic packing preparation, and provides a method for synthesizing electrolytic packing in iron carbon through in-situ carbothermic reduction. The method comprises the following steps of oxidization modification, wherein coal pitch is dispersed into a Fenton reagent, the mass ratio of the coal pitch to the Fenton reagent is 1:(5-100), after a hydrothermal reaction is performed for 3-12 h at the temperature of 150 DEG C-250 DEG C, an active regulator is added, the hydrothermal reaction is continuously performed for 3-10 h at the temperature of 150 DEG C-200 DEG C, centrifugal separation is performed, and drying is performed for 4-6 h at the temperature of 120 DEG C-150 DEG C; in-situ reduction, wherein the obtained modified matter is roasted for 2-8 h at the temperature of 500 DEG C-1200 DEG C. The method is low in cost and simple in preparation process, and the prepared iron carbon packing is developed in pore structure and high in metal active component dispersity and wastewater treatment capacity.

The invention relates to a method for modifying rare earth of a molecular sieve, which is characterized in that an aluminum source on the molecular sieve surface is used, Zn(Mg)/Al/La(Ce) ternary hydrotalcite is subjected to in situ synthesis, The synthesized hydrotalcite material comprises the following components: (1-50)zinc salt(magnesium salt): (1-50)aluminum salt: (10-100)H2O: rare earth compound. A program temperature-raising calcination method is used, P2O5, La2O3 or Ce2O3 is highly dispersed on the surface and tunnel of the molecular sieve, thereby the acidity of the molecular sieve is enhanced. The USY molecular sieve modified by using a hydrotalcite precursor method is used to prepare a mode catalyst, compared with the mode catalyst prepared by the USY molecular sieve modified by using a dipping method, the MAT index is increased by 3.58%, the gas yield is decreased by 0.21%, the gasoline yield is increased by 1.59% and the carbon deposit is decreased by 0.63%.

The invention provides a preparation method of a catalyst for environmentally-friendly efficient conversion of furfural into 2-methylfuran, and relates to a catalyst preparation method. According to the present invention, the high dispersion of active components, rare earth and other modification components is achieved through the precipitation and hydrothermal synergetic preparation method; the catalyst comprises 20-50% of a copper oxide, 40-70% of silicon oxide, 0-8% of alumina, and 1-6% of a rare earth oxide of La, Ce, Pr, Nd, Sc, Y and other rare earth elements, and is a regulated modifiedCu catalyst; and with the application of the synthesized environmentally-friendly catalyst in the preparation of 2-methylfuran through gas phase hydrogenation of furfural, the furfural conversion rate is 100%, the 2-methylfuran selectivity is more than 90%, and the performance is stable after the continuous operation for 500 h.

The invention relates to a residue-free instant marinating material. The residue-free instant marinating material is characterized by being prepared from the following spices in parts by weight: 10-17parts of star anise, 5-8 parts of rhizoma kaempferiae, 2-3 parts of villous amomum fruits, 3-5 parts of radix angelicae, 3-5 parts of white peony roots, 2-5 parts of cloves, 5-7 parts of cinnamon bark, 8-10 parts of fennel fruits, 1-3 parts of bay leaves, 1-3 parts of fructus tsaoko, 5-8 parts of ligusticum chuanxiong, 3-7 parts of licorice roots, 3-6 parts of dried orange peel, 1-3 parts of murraya paniculata, 3-6 parts of nardostachys jatamansi roots, 1-3 parts of rhizoma polygonati fruits, 1-2 parts of rhizoma alpiniae officinarum, 6-8 parts of Chinese prickly ash, 1-2 parts of fructus piperis, 5-8 parts of old ginger, 4-7 parts of scallions, 8-14 parts of white granulated sugar, 2-3 parts of chicken essence, 1-3 parts of monosodium glutamate, 20-30 parts of table salt and 1-2 parts ofethyl maltol. The residue-free instant marinating material disclosed by the invention not only has the same fragrance as that of a conventional marinating material, but also is free from precipitateor residues in the marinating process, and marinating liquid can be quickly made.

On the basis of previous research work accumulation, an MOFs photocatalyst with a titanium-based metal cluster as a central node and an amino-containing photosensitive matrix as a ligand is designed, a novel efficient bismuth titanate-coated NH2-MIL-125 composite catalytic catalyst is prepared by using an in-situ etching regeneration strategy, a novel stable, green and efficient photocatalytic NO elimination way is developed, and the photocatalytic NO elimination effect is improved. The basic relationship between the structure and the performance is deeply studied, and diversified MOFs photocatalyst molecular libraries are constructed. Meanwhile, on the basis of reasonable molecular structure design, basic laws between in-situ etching of bismuth nitrate pentahydrate with different contents and the structure and catalytic performance of the MOFs material are deeply explored, and the application prospect of the MOFs material in the heterogeneous catalysis field of visible light catalysis NO elimination and the like is developed. By adjusting the mass of bismuth nitrate pentahydrate, it is found that when the mass ratio of bismuth nitrate pentahydrate to NH2-MIL-125 is 4: 10, the in-situ etching effect is the best, and the NO elimination effect is the best.

The invention relates to a preparing method for a range limiting type nanometer zero-valent iron-nickel composite, and belongs to the technical field of environmental protection. Iron salt and nickelsalt are firstly dissolved in an organic solvent to obtain a solution A, and an organic ligand is dissolved in a same organic solvent to obtain a solution B; then the solution A is quickly added intothe solution B, centrifugal separation is carried out after even stirring, solid obtained after centrifugal separation is washed with DMF, and then vacuum drying is carried out on the solid to obtainan iron-nickel complex; and finally the iron-nickel complex is calcined at high temperature in an inert gas atmosphere and is then cooled to room temperature to obtain the iron-nickel composite. The method is simple, the prepared range limiting type nanometer zero-valent iron-nickel composite has the obvious and enhanced dechlorination performance on organic chloride pollutants, agglomeration passivation can be avoided, and the problem of agglomeration passivation of nano-bimetallic particles in the prior art is solved.

The invention discloses a preparation method of procaine, which comprises the following steps: (1) sequentially adding xylene, 4-nitrobenzoic acid and N, N-diethylethanolamine in a certain proportion into a reaction container in a stirring state, controlling the temperature at 140-150 DEG C, reacting and refluxing for 12-36 hours, stopping heating, and cooling to room temperature to obtain a nitrocaine solution, extracting with a 3-10% hydrochloric acid aqueous solution to obtain an upper layer which is a xylene solution and a lower layer which is a hydrochloride aqueous solution of nitrocaine; and (2) adding a hydrochloride aqueous solution of nitrocaine into a reaction kettle, adding the supported palladium-ruthenium bimetallic catalyst, introducing hydrogen until the hydrogen pressure is 0.5-2.0 MPa, controlling the reaction temperature to be 60-100 DEG C, carrying out water-phase hydrogenation reaction, and carrying out post-treatment after full reaction to obtain procaine. The method disclosed by the invention is simple in process, green and environment-friendly, and high in product yield.

The invention relates to the technical field of chemical processes, in particular to a preparation method of a D2 structure hexafluoropropylene dimer. According to the preparation method of the D2 structure hexafluoropropylene dimer, 5-bromine-6-sulfydryl pyridine and vinyl trifluoroborate are subjected to a sulfydryl-alkene reaction, the prepared auxiliary is added into metal fluoride, the valence state of metal can be stabilized, the catalytic activity can be improved, and high dispersion of active components in a fluorine-containing catalyst is achieved.