102 results about "Post synthesis" patented technology

A method has been developed for the post-synthesis separation of nanotubes by size and/or type. Solubilized, functionalized nanotubes are passed over a GPC column such that length-separated fractions are collected. These length-separated fractions can then further be separated by diameter or type. Particularly useful are methods for separating nanotubes into metallic and semiconducting fractions.

The invention discloses a MOF (metal-organic framework) and polyurethane crosslinked membrane as well as a preparation method and an application thereof. Post-synthesis modification is performed on active amino or hydroxyl on MOFs through a polyurethane prepolymer, nanocrystals of the MOFs are linked under the covalent bond function of active amino or hydroxyl and polyurethane prepolymer, so that the compatibility and the acting force between the MOFs particles and a polymer chain are improved, modified MOFs derivatives are endowed with excellent flexibility and a film-forming property, and a new method for preparing MOFs membrane devices is established. The synthesized MOFs membrane material has good selective separation effect on dye molecules in water and has great application prospects in the membrane separation field.

The invention discloses a method for synthesizing diphenyl carbonate by heterogeneous ester interchange. The method uses methyl carbonate and phenol as raw materials and hetero-atom mesoporous molecular sieve as a heterogeneous catalyst to synthesize the diphenyl carbonate through ester interchange. The method mainly solves the problems of difficult separation and recycling of the catalyst, low yield of the diphenyl carbonate, and the like. The hetero-atom mesoporous molecular sieve as the catalyst can be prepared through a direct synthesis method, and can also be prepared through a post synthesis method. The ester interchange product of the method has high yield and good selectivity, wherein the yield reaches 45.1 percent and the selectivity reaches 99.9 percent; and particularly the molecular sieve catalyst used by the method has the advantages of no pollution to environment, no corrosion to equipment, easy separation and recycling, and the like, and can be widely applied to production of the diphenyl carbonate.

A process is provided for using oligonucleotide to which a detectable moiety is attached post-synthesis. A metal-containing fluorescent compound affords real-time detection of nucleic acid elongation, amplification, or hybridization. The process is especially advantageous since a detectable moiety is readily attached to an existing oligonucleotide at an internal nucleotide, rather than being limited to attachment at a 3′ or 5′ terminus.

The invention provides a method for preparing a supported bimetal organic framework material MIL-100(Fe-Cu) and denitration application, and belongs to the field of novel material design and preparation. By means of the post-synthesis modification method, the Cu element is successfully introduced into an original MOFs framework, and a novel MOFs material with bimetal active sites is constructed. The method is characterized in that the hydrothermal technology is used, a metal precursor solution is prepared by means of stabilizer to be effectively combined with Fe-MOFs, and the material MIL-100(Fe-Cu) is prepared and used for denitration reaction. Compared with an original monometal catalyst, a catalyst prepared through the method has unsaturated active sites of Fe3+ and Cu+, denitration activity is improved by about 15%, and the material is good in dispersity, high in yield and good in catalytic activity.

The object of the present invention is a process for the elimination of sulphur compounds from the gasoline fraction, characterized in that it comprises carrying out an oxidation reaction of said sulphur compounds using at least one organic-inorganic composite as a catalyst which comprises at least:

• • Si,
  • Ti and
  • silicon linked to carbon and using organic or inorganic hydro-peroxides as oxidating agents.

According to the process for the present invention, said organic or inorganic composite is obtained by means of a process that comprises a sililation stage during synthesis or by means of a process that comprises a post-synthesis sililation stage.

The invention discloses a synthesis method for increasing the Pd content of a metal organic framework based on Zr(IV) ions. The method comprises the following steps: performing a coordination polymerization reaction between an organic ligand (I) and ZrCl4, and performing post-synthesis modification of the product, wherein the post-synthesis modification comprises the following specific steps: enabling a coordination polymerization reaction product, 2-pyridylaldehyde or salicylaldehyde and a catalyst formic acid in a molar ratio of 1:(1-4):(0.1-0.3) to react in an organic solvent; performing centrifugal washing of the product and dispersing in an organic solvent; adding palladium nitrate in a molar ratio of 1:(0.8-1.2); after the reactions, centrifuging and drying to obtain powder; dispersing the obtained powder into water; adding sodium borohydride in a molar ratio of 1:(0.5-1.5); and after the reactions, centrifuging, washing and drying to obtain the product. In the invention, the synthesized compound is an organic-inorganic composite supermolecular material and has a metal organic framework which is easy to operate and low in cost and has nanoscale particle size; and the compound has very high efficiency when being used as a catalytic material for benzyl alcohol oxidation and benzaldehyde condensation.

The current invention restates substituted indole nucleosides as both terminal as well as internal building blocks of labeled oligonucleotide probes for the detection, analysis and quantitation of nucleic acids. The substituent comprises a linker and a detectable group or a linker and a reactive group for post synthesis coupling. These modified nucleosides grant access to a wide application area. These new substituted indole nucleosides can be used as labeling reagents for the facile preparation of e.g. optimized hybridization probes, Taqman-probes, or molecular beacon probes.

An iron-zeolite chabazite (CHA) catalyst is provided as an SCR catalyst for reducing nitrogen oxides (NO_x) from vehicle engine exhausts. The catalyst is formed by incorporating iron during synthesis of the chabazite zeolite, which eliminates the need for a post-synthesis ion-exchange step and which results in the incorporation of iron into the (CHA) zeolite crystal lattice structure. The resulting catalyst exhibits good high temperature activity at temperatures greater than 550° C. and exhibits good thermal stability.

The invention relates to the field of fluorescence probes, particularly to an Eu (III)-metal-organic framework and preparation and application methods thereof. The Eu (III)-metal organic framework isapplied to detection of quintozene. The Eu (III)-metal-organic framework has a chemical formula of {[(CH3)2NH2][Eu(cppc)2*2H2O]}n. The Eu (III)-metal-organic framework saves post-synthesis purification and can be directly applied to fluorescence detection of quintozene, thereby having the advantages of simple design, low cost and the like and being applicable to online sensitive and rapid analysis. The Eu (III)-metal-organic framework achieves a quintozene detecting limit of 1.67*10<-6> M and meanwhile is short in response time, and meanwhile, can be thoroughly separated through simple filtering, thereby being high in reutilization rate. Besides, the Eu (III)-metal-organic framework achieves universality in the field of fluorescence sensing and facilitates practical application.

The invention discloses a method for synthesizing 2, 5-hexanedione, which comprises the steps of the preparation of the 2, 5-hexanedione, the removal of front cut fraction, the refining of the 2, 5-hexanedione and so on. 2,5-dimethylfuran is taken as a raw material to synthesize the 2, 5-hexanedione, a step of adding water for atmospheric distillation after the removal of the front cut fraction is added during the synthesis, so the difficulty of the separation when a product is subjected to vacuum rectification is reduced, and the purity of the product is greatly improved; the front cut fraction and a transitional distillate can further be circularly used for the feeding during the post-synthesis so as to further improve the yield (can reach up to more than 90 percent), reduce the cost for the whole synthetic route, and has no pollution to the environment. The method has simple needed equipment, mild reaction conditions, and safe and easy operation, is suitable for industrialized production, is a more reasonable and more convenient novel way for circularly and economically synthesizing the 2, 5-hexanedione, and can prepare an intermediate, namely the 2, 5-hexanedione which is widely applied in fields such as medicine, spices, pesticides, photographic reagents, electroplating and paint-spraying.

The system and methods described provide for an Fe-SAPO-34 catalyst in an SCR catalyst for reducing nitrogen oxides (NOx) from vehicle engine exhausts. In one example, the catalyst is formed by incorporating iron during synthesis of the SAPO-34 zeolite, which allows iron to be incorporated into the zeolite crystal lattice structure and eliminates the post-synthesis ion-exchange step. The resulting Fe-SAPO-34 catalyst, which may be used in combination with or in addition to a Cu-CHA catalyst, exhibits good high temperature activity at temperatures above 550° C. and provides for a good thermal stability.

The invention discloses a preparation method and an application of a non-noble metal-loaded porous carbon material. According to the preparation method, a bipyridine covalent organic framework material used for loading non-noble metals through the post-synthesis method, and a porphyrin covalent organic framework material containing non-noble metals in the framework are adopted as precursors. Underthe protection of an inert gas, the room temperature is increased to a carbonization temperature through temperature programming, and then the temperature is kept for 120 minutes. In this way, a non-noble metal-loaded porous carbon material is obtained. The material is then applied to a supercapacitor. According to the invention, the preparation method of the non-noble metal-loaded porous carbonmaterial is simple in operation, and no template agent is required. The prepared non-noble metal-loaded porous carbon material is high in specific surface area and high in thermal stability. The material can be used as an electro-active material to prepare a supercapacitor working electrode, and is good in electrochemical performance.

The invention discloses a movie post-synthesis anti-aliasing method. The movie post-synthesis anti-aliasing method comprises the following steps: (1) aimed at a three-dimensional model to be rendered in each frame, ray tracing is used, the three-dimensional model is rendered by utilizing an illumination model and given material information, and multilayer pictures corresponding to the illumination model and boundaries corresponding to the three-dimensional model in each layer of picture are obtained; (2) according to the three-dimensional model, geometrical information of facets where the boundaries are located are obtained; (3) by utilizing the geometrical information of the facets and aimed at the each layer of picture of the multilayer pictures, anti-aliasing is carried out, and multilayer pictures after anti-aliasing are obtained; and (4) the multilayer pictures after anti-aliasing are mixed to complete the processing of the current frame. The movie post-synthesis anti-aliasing method is suitable for a drawing system in the film industry, achieves raid drawing, preview and synthesis of a movie, and resists against aliasing effectively.

The invention belongs to the technical field of solid catalysts, and discloses a modified mesoporous molecular sieve supported platinum-based catalyst for hydrogenation and depolymerization of ligninand a preparation method thereof. The preparation method comprises the steps that pure silicon mesoporous molecular sieve SBA-15 is used as a carrier, aluminum doping modification is performed by a post-synthesis method, then water-soluble platinum salt is used as a platinum source, platinum is loaded by an impregnation method, and the modified mesoporous molecular sieve supported platinum-based catalyst is obtained. The catalyst is of a regular two-dimensional hexagonal pore structure and has rich acid active sites, the loaded platinum nanoparticles are small (2-5 nm), the pore diameter is large (6-9 nm), the specific surface area is large (400-600 m<2>/g), the dispersion is uniform, the stability is good, excellent catalytic performance in the reaction of lignin hydrogenolysis for preparation of aromatic monomer compounds is achieved, the bio-oil yield can reach 83.33%, the yield of aromatic monomer can reach 25.79%, and the selectivity to products is higher, especially for propyl guaiacol.

The impact of post-synthesis processing in, for example, graphene oxid or reduced graphene oxide materials for super-capacitor electrodes has been analyzed. A comparative study of vacuum, freeze and critical poin drying was carried out for graphene oxide or hydrothermally reduced graphene oxide demonstrating that the optimization of the specific surface area and preservation of the porous network is important to maximize its properties such as supercapacitance performance. As described below, using a supercritical fluid as the drying medium, unprecedented values of specific surface area (e.g., 364 m²g⁻¹) and supercapacitance (e.g., 441 F g⁻¹) for this class of materials were achieved.

The invention relates to the preparation of novel bi- or tri metallic silicate micro-porous and/or meso-porous materials based on cerium, nickel, copper and/or zinc on a porous silicate framework matrix to use its molecular sieve effect to target preferentially the acidic organic molecules present in hydrocarbon feedstocks like crude oil, bitumen, VGO and the like. The chosen metals are selected based on their ability to activate steam and transfer oxygen for completing the oxidation of carboxylic compounds or decarboxylating them. These composite materials can be prepared under hydrothermal synthesis conditions in order to produce suitable porous solids where the metals are well dispersed and preferentially distributed inside the channels of the silicate framework where they can interact only with the molecules that can go inside the channels. According to the invention, the metallo-silicate materials are prepared under hydrothermal synthesis conditions Modification of the physical-chemical properties of the porous silicate materials can be accomplished by partial replacement of the silicon atoms by cerium, nickel, copper and/or zinc atoms in the material by isomorphous substitutions of these elements in a synthesis gel or by post-synthesis modifications like ion-exchange or impregnation/deposition. The materials can be used as prepared catalysts for the steam catalytic reduction of the total acid number (TAN) in acidic crude oil feedstocks and in the presence of steam and/or CO₂ as oxidizing agent to complete decarboxylation and to keep the metal oxide active sites from reducing and deactivating as well as other partial upgrading reactions.

The invention discloses a preparation method of 3-(difluoromethyl)-1-methyl-1H-pyrazol-4-carboxylic acid. The reaction formula is shown in the specification. Difluoroacetic acid, which is relatively low in price and small in molar mass and is introduced at a post-synthesis phase is adopted, so that the preparation method of the 3-(difluoromethyl)-1-methyl-1H-pyrazol-4-carboxylic acid is low in cost, simple and safe in technological operation, high in product content, and high in product yield; the content is 98.1-98.9% (liquid chromatogram, external standard); the total yield is 52.2-56.9% (based on propargyl alcohol). Nanoscale titanium dioxide is adopted to carry out catalytic esterification, so that the reaction yield is high; the reaction time is short; the used raw materials and solvent are cheap and available; furthermore, an organic solvent is avoided in the four reaction steps, so that the solvent recovery cost and the environmental pollution risk are greatly reduced.

Two methods for post-synthesis circuit optimization are disclosed. In both methods, the underlying variability in process parameters is captured through a robust linear program. The robust linear program is then reformulated as a second order conic program that possesses special structural properties to allow for a computationally efficient solution by using interior point optimization methods. The first method treats gate delays as uncertain quantities and obtains the optimal sizes for gates in a circuit under a probabilistically specified circuit timing target. The second method optimizes total circuit power by using a combination of dual threshold voltage assignment and gate sizing. Both circuit power and timing are treated probabilistically.

The present invention relates to branched addition copolymers which can be cured post synthesis to form films or membranes, methods for their preparation, compositions comprising such copolymers and their use in film or membrane preparation.