895 results about "Active center" patented technology

The invention relates to a preparation method of a mesoporous-containing Y-shaped molecular sieve, and relates to a preparation method of a Y-shaped molecular sieve. The preparation method aims to solve the problems of small pore diameter and pore volume of the Y-shaped molecular sieve prepared through the traditional method. The preparation method comprises the following steps of: 1, preparing a sodium type Y-shaped molecular sieve; 2, preparing an ammonium type Y-shaped molecular sieve; 3, processing through an organic acid water solution; 4, processing through NaOH; and 5, processing through an ammonium nitrate water solution so as to obtain the mesoporous-containing Y-shaped molecular sieve. The mesoporous-containing Y-shaped molecular sieve is synthesized through a simple and effective method under a moderate condition, contains abundant mesoporous, is unchanged in microporosity, achieves the volume of the mesoporous at 0.5-1.5 mL/g, greatly promotes the macromolecule to approach a catalytic active center and is favorable for reaction mass transfer through more concentrated pore diameter distribution, has the advantages of adjustable ratio of silicon and aluminum contained in a framework and good hydrothermal stability and can be used as a catalyst carrier or directly used as a catalyst. The preparation method disclosed by the invention can be used for preparing the mesoporous-containing Y-shaped molecular sieve.

The invention relates to a catalyst used in a ring-opening hydrogenation reaction of a furan derivative. The catalyst is applied to direct preparation of one-step ring-opening hydrogenation of 1,5-pentanediol and 1,2-pentanediol by taking furfural or furfuryl alcohol serving as a raw material under a mild condition. The catalyst can provide two active ingredients, namely the ring-opening active center of a transition metal oxide and the hydrogenation active center of Pt, Pd, Rh, Ru, Co or Ni, wherein the active center of the transition metal oxide is mainly used for adsorbing furfural or furfuryl alcohol and directly hydrogenating a furan ring for opening the furan ring; and the hydrogenation active center of a noble metal or Co, Ni and the like is mainly used for quickly hydrogenating an intermediate material and hydrogenating subsequent enol so as to obtain 1,5-pentanediol and 1,2-pentanediol. An environmentally-friendly, reproducible, low-cost, mild and effective method is provided for producing 1,5-pentanediol and 1,2-pentanediol. The high-performance ring-opening hydrogenation catalyst is also suitable for the ring-opening hydrogenation reaction of other furan derivatives.

The invention discloses a supported metal oxide double-active center ethylene-polymerization catalyst and its preparation method and use. The supported metal oxide double-active center ethylene-polymerization catalyst is characterized in that a supported vanadium active ingredient is introduced to a Phillips chromium-based catalyst; and the supported metal oxide double-active center ethylene-polymerization catalyst comprises the two active ingredients and an inorganic carrier, wherein the two active ingredients comprise a chromium oxide and a vanadium oxide. The preparation method of the supported metal oxide double-active center ethylene-polymerization catalyst comprises the following steps of coating a chromium salt and a vanadium salt on the inorganic carrier according to a certain ratio by a stepwise dipping or co-dipping method, carrying out drying, and carrying out high-temperature calcination. The supported metal oxide double-active center ethylene-polymerization catalyst is a catalyst for high-efficiency preparation of polyethylene, and can be used for preparation of an ethylene homopolymer or an ethylene-alpha olefin copolymer. The supported metal oxide double-active center ethylene-polymerization catalyst has high polymerization activity. Through the supported metal oxide double-active center ethylene-polymerization catalyst, polyethylene product molecular weight distribution is wide, wherein molecular weights of a part of polyethylene products are distributed in a double-peak way; hydrogen regulation sensibility and copolymerization performances are good; and the existing equipment utilizing a Phillips catalyst to realize preparation of polyethylene can be popularized and used without reforming.

The invention provides a copper-rare earth compound antimicrobial agent and a preparation method and an application thereof. The antimicrobial agent is compound carrier prepared by chemically-synthesized sodium zirconium phosphate and natural tourmaline according to the weight ratio of 1.2-5.7:1 and loaded by copper ions and rare earth ions by an ion exchange method, wherein the content of the copper ions is 3.4-9.0wt percent, the content of the rare earth ions is 1.5-4.5 wt percent, and the rare earth comprises La, Ce, Nd, Sm and Eu. The preparation method comprises the steps of exchanging the copper ions and the rare earth ions into the carrier through a liquid phase or solid phase ion exchange method and preparing the compound antimicrobial agent through proper post treatment. Containing three antimicrobial active centers of the copper ions, the rare earth ions and negative ions, which can generate synergistic effect, the compound antimicrobial agent has the characteristics of better thermal stability and light resistance, stable color and low cost, and can be added to materials such as plastics, rubber, fiber, coating, bonding adhesive, ceramics and the like for preparing antimicrobial functional materials and products.

The invention discloses a nickel hydroxide/nickel disulfide/foam nickel composite and a preparation method thereof, and application thereof. The composite is expressed in the form of Ni(OH)2/Ni3S2/NFand can be used as an electrode. In the electrode structure, the nano-stem-like Ni3S2/NF is a conductive skeleton, and the Ni(OH)2 nanosheet is equivalent to a leaf and grows on the nano-stem-like Ni3S2/NF skeleton. The heterointerface of Ni(OH)2 and Ni3S2 having a defect structure is the active center. The Ni(OH)2/Ni3S2/NF electrode can be used as a bifunctional catalyst, has excellent cathodic catalytic hydrogen evolution and anodic catalytic oxygen evolution reaction performance, and has high current long-term total electrolysis hydrogen production and oxygen production stability. Comparedwith noble metal catalysts such as Pt and RuO2, the catalyst synthesis method is simple, rich in raw materials and low in cost.

The invention provides a novel CO2 adsorbent and a method for preparing the same. The novel CO2 adsorbent is a mesoporous material modified by an amino group. The method for preparing the novel CO2 adsorbent comprises that: the grafting method is adopted; the pre-synthesized mesoporous material is pretreated, added to a solvent, evenly stirred at the room temperature and added with amino organosilane dropwise and stirred, and the obtained mixed solution is slowly heated up to a temperature of between 30 and 90 DEG C and kept warm for 10 and 20 hours; and after sucking filtration, the obtained solid product is activated in a vacuum oven at a temperature of between 80 and 150 DEG C for more than 10 hours. Due to the amino functional group modification on the surfaces of porous channels of the mesoporous material, the acidity-alkalinity of the surface is changed, thereby providing an adsorption activity center for the acidic gas CO2 and obviously improving the adsorption efficiency of CO2.

The invention discloses a honeycomb-type denitration catalyst with a hierarchical pore structure and a preparation method for the honeycomb-type denitration catalyst. The catalyst has a honeycomb-type structure; micron- and nano-size blind holes are formed in the wall surface of the catalyst; the diameter of each micron-size blind hole is 0.1-1 micron; the diameter of each nano-size blind hole is 10-100 nanometers. The technological process is simple; PMMA (polymethyl methacrylate)(PS (Poly Styrene)) microspheres and polyoxyethylene are added, and other additives and technical conditions are adjusted, so that the high-porosity honeycomb-type denitration catalyst with the hierarchical pore structure is obtained. The catalyst can generate multiple active centers, is high in adsorption and mass transfer capacity and has the advantages that the using amount of the catalyst within the same unit volume is small and the like; therefore, the catalysis performance of the catalyst is guaranteed, and the using amount of catalyst raw materials and the weight of a finished product within the unit volume are reduced.

The invention relates to a catalyst used in preparation of long-chain alkane through catalytic hydrodeoxygenation of biomasses such as microalgae oil, palm oil and plant oil. The catalyst mainly comprises two active ingredients: an acid center of a carrier containing a transition metal and a hydrogenation activity center of the metal, wherein the acid center of the carrier containing the transition metal is used for dewatering an intermediate product generated in biomass hydrogenation, is used as a strong Lewis acid center simultaneously, and has the very strong oxyphilic capacity, so that an important role in hydrogenolysis of a C-O bond is developed. According to the catalyst disclosed by the invention, for example, in the hydrodeoxygenation process of the palm oil, the plant oil and the microalgae oil, the raw material conversion rate can reach 100 percent and the alkane selectivity is more than 90 percent. According to the catalyst disclosed by the invention, the high-selectivity preparation of the long-chain alkane is realized under a relative mild condition, and the problems of rigorous reaction conditions, low energy efficiency, and low high-carbon alkane selectivity in the process of preparing the long-chain alkane from the biomasses are solved.

The invention discloses a catalyst used for synthesis of paraxylene through alkylation reactions between coking benzene and methanol and a preparation method thereof. The catalyst comprises carriers and active components, the carriers are HZSM-5 molecular sieves or SAPO-11 molecular sieves which have been subjected to a water steam heating treatment, and the active components are metal oxides. The molecular sieves are subjected to a high-temperature water steam heating treatment, thus active centers and acid-base properties of the molecular sieves are evenly distributed, and the acidity of the molecular sieves is reduced, so active components can be evenly loaded on the carriers, the catalyst is not easy to be poisoned or lose activity when the catalyst is catalyzing the alkylation reactions of coking benzene, the conversion rate of the alkylation of coking benzene is increased, and the service life of the catalyst is prolonged at the same time.

The invention discloses a platinum-gallium catalyst loaded on double-oxide composite carrier as well as a preparation method and an application of the platinum-gallium catalyst. A CeO2-Al2O3 double-oxide carrier is prepared by using CeO2-Al2O3 double-oxide as a carrier, Pt as an active component and Ga as an assistant in a leaching method; the obtained carrier is steeped into chloroplatinic acid and gallium nitrate solutions, is dried and baked to obtain the catalyst. The catalyst is suitable for low alkane dehydrogenized olefin under a hydrogen atmosphere. Taking propane dehydrogenized propylene as an example, because of the addition of CeO2, lattice oxygen is provided to help inhibiting carbon storage; alloys are formed by Ga and Pt to change acting force of products and reactants and Pt in activity center, and Ga is embedded into the lattice of CeO2, so that the oxygen storage and oxygen moving capability of CeO2 are improved. Because of the addition of CeO2 and Ga, the selectivity of propylene and the carbon storage resisting capability are improved, and the relatively-high reaction stability of the catalyst under a high-temperature condition is guaranteed.

The invention provides a graphene-loaded titanium-based core-shell-structured low-temperature SCR sulfur-resisting catalyst and a preparation method thereof. The preparation method of the graphene-loaded titanium-based core-shell-structured catalyst comprises the following steps: firstly forming a compound core-shell structure MnOx-CeO2@TiO2 by taking a nano particle MnOx-CeO2 as a core and TiO2 as a shell, and compounding the MnOx-CeO2@TiO2 with graphene, wherein the size range of the catalyst is within a range of about 20nm-200nm and the mol ratio of Mn to Ce to Ti in the core-shell structure MnOx-CeO2@TiO2 is (0.05-1) to (0.05-1) to 1; and the mass ratio of a graphene carrier to the nano core-shell structure MnOx-CeO2@TiO2 is (0.01-0.6) to 1. According to the invention, the graphene-loaded titanium-based core-shell structure is constructed for the first time and the active center of the catalyst is protected through special physicochemical properties of the core-shell catalyst and the accumulation of ammonium sulfate is reduced by virtue of graphene, so that the sulfur-resisting capability of a low-temperature denitration catalyst is enhanced.

The invention provides a low-temperature SCR (Selective Catalytic Reduction) denitration catalyst with a titanium-based core-shell structure and a preparation method of the catalyst. The titanium-based core-shell structure of the catalyst is formed by use of composite nanoparticles MnOx-CeO2 as the core and TiO2 as the shell and the size range of the catalyst is from 20nm to 200nm, wherein the molar ratio of the three elements Mn, Ce and Ti is (0.05-1): (0.05-1): 1. The preparation method of the catalyst mainly comprises the following steps: (1) mixing cerous nitrate with a manganese nitrate solution, dropwise adding a sodium hydroxide solution and then shifting the mixed solution to a hydrothermal kettle, and carrying out reacting, centrifuging, washing, drying and calcining to obtain the nanoparticles MnOx-CeO2; (2) preparing the nanoparticles with the core-shell structure in a reversed-phase microemulsion with CTAB (Cetyltrimethyl Ammonium Bromide) as a surfactant, n-amyl alcohol as a cosurfactant and cyclohexane as an oil phase. The low-temperature SCR denitration catalyst with a titanium-based core-shell structure has the advantages that the titanium-based core-shell structure is constructed for the first time, the center of the catalyst is protected by use of the TiO2 shell, and the probability that the active center contacts with SO2 in flue gas is reduced, and therefore, the active center is prevented from irreversible poisoning caused by erosion of SO2.

The invention provides a novel ionic liquid with dual functions of oxidation and temperature control, and a preparation method of the ionic liquid. The designed synthesis of the imidazole ionic liquid with the dual functions of oxidation and temperature control is completed by introducing a temperature control unit (PEG chain) to an imidazole group positive ion structure of the ionic liquid and taking a heteropoly acid root, which is composed of high-valence tungsten, molybdenum and vanadium with catalytic oxidation active centers, as negative ions of the ionic liquid. The synthesis steps are as follows: imidazole and ethylene oxide are subjected to polymerization reaction to prepare an intermediate I; the intermediate I and alkyl halide are subjected to quaterisation reaction to prepare an intermediate II; the intermediate II and different heteropoly acids are subjected to anion exchange reaction to prepare a target product III. The invention prepares the ionic liquid with the dual functions of oxidation and temperature control for the first time, and the catalytic oxidation reaction system of the ionic liquid has the characteristics of homogeneous reaction at high temperature and two-dimensional separation at low temperature and can realize integration of reaction and separation.

The invention discloses loaded alpha-palladium diimine and a method for preparing hyperbranched polyethylene by catalyzing with same. The loaded alpha-palladium diimine is obtained by loading a loaded alpha-palladium diimine complex on an acryloyl chloride-modified magnesium chloride carrier and performing cationization, wherein the magnesium chloride carrier is a magnesium chloride/ethanol compound; and the alpha-palladium diimine complex has a structure shown as a formula (I). In the invention, the alpha-palladium diimine complex is loaded on the acryloyl chloride-modified magnesium chloride/alcohol compound carrier under the actin of a chemical bond, so that the influence of a functional group on the carrier surface on the active center is lowered, and the catalytic activity is higher than those of corresponding homogeneous phase catalysts; and moreover, the carrier and the catalyst have high bonding strength under the action of a valence bond, so that the active center can be effectively prevented from falling easily in the polymerizing process. The loaded alpha-palladium diimine can be taken as a catalyst for use in preparation of hyperbranched polyethylene, and has high catalyst activity; and the formula (I) is shown in the specifications.

The invention provides a fluorescent probe. The structural formula of the fluorescent probe is represented by general formula I shown in the specification, wherein R is one of C7-C12 alkyl groups. The invention further provides a preparation method of the fluorescent probe and an application of the fluorescent probe to detection of cyanide ions. A phenothiazine derivative is used as a fluorescent parent, a malononitrile structure is introduced as an active center reacting with the cyanide ions, and selective detection of the cyanide ions is realized by the aid of fluorescent differences between reactants and products. The prepared fluorescent probe PTZ is excited at 488 nm and emitted at 702 nm, has very high selectivity and sensitivity for the cyanide ions and is high in response speed, the lowest concentration of the cyanide ions is detected to be 67 nmol/L<-1>, the cyanide ions can be detected quantitatively, and the fluorescent probe can be applied to detection of the cyanide ions in water bodies, soil and organisms.

The invention discloses a preparation method and application of platinum-modified metal organic material MOF 2-Pt-FA as a two-way enhanced photodynamic therapy drug. The preparation method is as follows: first, a two-dimensional MOF nano-sheet with Cu(II) as an active center is prepared, then a platinum nanoparticle is deposited on the surface of MOF 2, and then poly(ethylene glycol)-folic acid ismodified on the surface of MOF 2-Pt to enhance targeting and compatibility to obtain a nano-drug; after the targeted cell uptake of the nano-drug, Cu(II) in the MOF 2 can reduce a concentration of GSH, and thereby the level of light-triggered reactive oxygen species generated by MOF is enhanced; in addition, the platinum nanoparticle in the prepared drug has the catalase-like activity, and can decompose H2O2 in cells into O2 to alleviate the hypoxic environment of tumors; and experiments show that the combination of GSH exhaustion and hypoxia relief can significantly improve PDT efficiency. The metal organic nanomaterial disclosed in the invention can be used as a nano-drug for photodynamic therapy, and has the clinical potential for treating tumors.

The invention discloses a method for preparing a supported nano-cobalt catalyst by pyrolysis of a deep eutectic solvent and an application. The method comprises the following steps: firstly, preparinga carbon black mixture supported with the deep eutectic solvent, then pyrolyzing the mixture at high temperature in an inert gas atmosphere to obtain the supported nano-cobalt catalyst, and applyingthe supported nano-cobalt catalyst to an aromatic alcohol liquid phase selective oxidation system with molecular oxygen as an oxygen source. Compared with the prior art, the supported nano-cobalt catalyst prepared with the method has the advantages that a nitrogen-doped carbon skeleton with high specific surface is effectively integrated with the catalytic active center of uniformly dispersed metal cobalt, oxygen can be activated as an oxidant in the absence of alkalinity and aids, aromatic alcohol is catalyzed and oxidized in a green and efficient way, aromatic aldehyde or aromatic ketone isobtained, and the problems about difficulty in recovery, discharge of three wastes and the like caused by extra need of homogeneous organic alkali in the catalytic oxidation process of traditional catalysts are solved. The catalyst prepared with the method has the advantages of high selectivity, high activity, high stability, magnetic recyclability and the like, and has good application value andprospect.

The invention discloses a preparation method of a high-temperature inactivation resistant load type gold catalyst for synthesizing chlorethylene in acetylene hydrochlorination. The catalyst takes active carbon as a carrier, takes aminothiopropionic acid, cystine, methionine and thiocarbamide as active carbon organic surface modifiers and takes auric chloride as an activity center. During the reaction of synthesizing chlorethylene in acetylene hydrochlorination, the active carbon surface modified load type gold catalyst has a high-temperature inactivation resistant performance better than that of an unmodified active carbon load type gold catalyst.

In present ivnention,l soaking method is used to make a hydrophilic polymer containing cation or amine group be adsorbed on the polymer membrane containing anion-active centre, then enzyme preparation or other reagent containing separation or catalytic activity are used to make treatment so as to form immobilized enzyme membrane. Said invention utilizes proper crosslinking reaction to raise stability of immobilized membrane. Said invention can adopt similar method to fix the substance with separation and catalytic activity on the polymer membrane to prepare active membrane with separation and synthesis functions.

The invention provides a loaded double-metal hydrogenation catalyst, and a preparation method and application thereof. The catalyst comprises a gamma-Al2O3-contained carrier and active metal components loaded on the gamma-Al2O3-contained carrier, wherein the active metal components comprise a group-VIB metal component and a group-VIII metal component which have the following characteristics: through the analysis of an X-ray photoelectron spectroscopy, the mol ratio of the group-VIB metal atom to the Al atom on the surface of the catalyst is measured to be 0.11 to 0.25, and the mol ratio of the group-VIII metal atom to the Al atom on the surface of the catalyst is measured to be 0.01 to 0.10; and through the analysis of an X-ray fluorescence spectroscopy, the mol ratio of the group-VIII metal atom to the group-VIB metal atom in the catalyst is measured to be 0.2 to 1. The loaded double-metal hydrogenation catalyst prepared by using the method provided by the invention has good dispersibility, active-centre accessibility and structural stability, significantly improves hydrodesulphurization property of the catalyst, and has good industrial application prospects.

The invention relates to a vanadium-free SCR denitration catalyst and a preparation method thereof, and belongs to the field of denitration catalysts. The rare earth modified low temperature SCR denitration catalyst adopts diatomite, molecular sieve and nanometer titanium dioxide as carriers and rare earth oxide as an active site, and does not adopt a toxic active component V2O5. Compared with catalysts in the prior art, the catalyst provided by the invention has the advantages of reduction of pollution to environment, and reaching of the cost reduction and use safety improvement purposes; and cross-linked chitosan resin added in the invention has a special three dimensional net structure, has good stability and good adsorption ability, and is used as the active site together with rare earth oxide, so the denitration activity of the catalyst is improved, and the reaction temperature is reduced. A denitration test result of the vanadium-free SCR denitration catalyst under fixed bed simulated flue gas conditions shows that the denitration rate is 94% or more.