90 results about "Zeolitic imidazolate framework" patented technology

The present invention relates to the selective separation of methane (“CH₄”) from higher carbon number hydrocarbons (“HHC”s) in streams containing both methane and higher carbon number hydrocarbons (e.g. ethylene, ethane, propylene, propane, etc.) utilizing a zeolitic imidazolate framework (“ZIF”) material. Preferably, the stream to be separated is fed to the present process in a substantially gaseous phase. In preferred embodiments, the current invention is utilized in a process to separate methane from higher carbon number hydrocarbons in natural gas streams.

The present invention relates to method for the synthesis in-situ of the class of compounds known generally as MOFs (metal organic frameworks or organometallic compounds), COFs (covalent organic frameworks), and ZIFs (Zeolitic imidazolate framework), within and onto different types of substrates, and to the applications of such substrates having in-situ synthesized MOFs, COFs and ZIFs.

The invention which belongs to the technical field of new materials relates to a synthetic method of ZIFs, and concretely discloses a method for synthesizing nanometer/micrometer scale ZIFs based on imidazole and its derivatives at room temperature in a concise, efficient and green manner. The method comprises the following steps: dissolving a single imidazole ligand or a mixture of two imidazole ligands in water or an organic liquid to form a solution, adding an alkaline substance to adjust the pH value of the solution, adding a metal salt to form a reaction system, and reacting to obtain the nanometer or micrometer scale ZIFs. The method which allows routine reactants to be utilized and the alkaline substance to be added to adjust the pH value of the system has the advantages of ligand application amount reduction, controllable product size, and high purity of the nanometer/micrometer scale ZIFs. The synthetic method has the characteristics of cheap and easily available raw materials and solvent, and no pollution, and has important meanings to the production and the application of the ZIFs.

The invention relates to a preparation method and gas adsorption properties of a boron/nitrogen-doped microporous carbon material, particularly a boron/nitrogen-doped microporous carbon material prepared by using metal organic framework ZIF-8 (zeolitic imidazolate framework-8) and boron nitrogen compounds as precursors by a high-temperature sintering method and gas adsorption properties of the boron/nitrogen-doped microporous carbon material for hydrogen, carbon dioxide, nitrogen and the like. The preparation method comprises the following steps: 1) preparing the porous metal organic framework ZIF-8; 2) limiting the boron nitrogen compounds (such as ammonia borane) to the inside of the pores of the metal organic framework ZIF-8 by a solution impregnating method; and 3) carrying out high-temperature sintering on the composite material in an argon atmosphere to obtain the boron/nitrogen-doped microporous carbon material. The preparation technique is simple; and the prepared carbon material implements simultaneous doping of boron and nitrogen and centralized distribution of micropore sizes, and has favorable adsorption property for hydrogen and selective adsorption property for carbon dioxide.

Provided herein are composites made up of open frameworks encapsulating sulfur, silicon and tin, and mechanochemical methods of producing such composites. Such open frameworks may include metal-organic frameworks (MOFs), including for example zeolitic imidazolate frameworks (ZIFs), and covalent organic frameworks (COFs). Such composites may be suitable for use as electrode materials, or more specifically for use in batteries. For example, sulfur composites may be used as cathode materials in Li-ion batteries; and silicon or tin composites may be used as anode materials in Li-ion batteries.

The present invention relates to the selective separation of carbon dioxide (“CO₂”) from nitrogen (“N₂”) in streams containing both carbon dioxide and nitrogen utilizing a zeolitic imidazolate framework (“ZIF”) material. Preferably, the stream to be separated is fed to the present process in a substantially gaseous phase. In preferred embodiments, the current invention is utilized in a process to separate carbon dioxide from combustion gas (e.g., flue gas) streams preferably for sequestration of at least a portion of the carbon dioxide produced in combustion processes.

The invention discloses a method for synthesis of a double-casing layer carbon nanometer hollow polyhedron by a metal-organic framework as a template and belongs to the field of novel energy and novel materials. The method comprises that a zeolitic imidazolate framework with a core-shell nanometer structure as a structure precursor is calcined at a high temperature to form the double-casing layer nanometer carbon hollow polyhedron. The cheap and easily available zeolitic imidazolate framework as a structure precursor is used for preparation of the double-casing layer carbon nanometer hollow polyhedron. The method has simple processes, is free of a template, realizes precise control of a shell structure by change of a zinc/cobalt-based zeolitic imidazolate framework ratio or calcining conditions, is environmentally friendly and can be industrialized easily. The double-casing layer carbon nanometer hollow polyhedron has a wide application prospect in the fields of energy storage, catalysis, photoelectric materials and drug transport.

The present invention relates to the selective separation of hydrogen (“H₂”) hydrocarbons in streams containing both hydrogen and hydrocarbons (e.g. methane, ethylene, ethane, propylene, propane, etc.) utilizing a zeolitic imidazolate framework (“ZIF”) material. Preferably, the stream to be separated is fed to the present process in a substantially gaseous phase. In preferred embodiments, the current invention is utilized in either a pressure swing adsorption process, a temperature swing adsorption process, or a membrane separations process to separate hydrogen from hydrocarbons present in hydrogen production streams or petrochemical/petroleum refining product streams and intermediate streams.

The present invention presents a mixed-matrix composite material comprising a continuous phase and zeolitic imidazolate framework (ZIF) particles dispersed in the continuous phase, wherein the continuous phase is polybenzimidazole (PBI), methods for making the mixed-matrix composite material, and methods for separating gas or vapor from a mixture of gases or vapors using the mixed-matrix composite material.

Zeolitic Imidazolate Frameworks (ZIFs) characterized by organic ligands consisting of imidazole ligands that are either essentially all 2-chloroimidazole ligands or essentially all 2-bromoimidazole ligands are disclosed. Methods for separating propane and propene with the ZIFs of the present invention, as well as other ZIFs, are also disclosed.

The invention discloses a nitrogen functional carbon material loaded with transition metal chalcogenide. A nitrogen doped zeolitic imidazolate framework structure carbon material is used as a carrier, through nitrogen functionalization, and then a hydrothermal reaction is performed with a precursor of the transition metal chalcogenide, so that the nitrogen functional carbon material loaded with transition metal chalcogenide is obtained. The material has excellent catalytic activity in an electrocatalysis water reduction hydrogen evolution reaction, and has a high efficiency in electrocatalysis water reduction hydrogen production.

Disclosed are mixed matrix polymeric membranes comprising a plurality of metal-organic frameworks (MOFs), or in some aspects a zeolitic imidazolate frameworks (ZIFs), and a polymeric matrix, wherein the plurality of MOFs are attached to the polymeric matrix through covalent or hydrogen bonds or Van der Waals interaction.

The invention discloses a preparation method of a sulfur-doped bifunctional oxygen catalyst based on ZIF-67 (Zeolitic Imidazolate Framework) and conductive graphene, and belongs to the technical fieldof zinc-air cell catalysts. The preparation method comprises the steps of taking ZIF-67 as a template, adding a certain amount of conductive graphene, taking thioacetamide as a sulfur source, and calcining in an inert atmosphere through a one-step solvothermal synthesis method to prepare a carbon porous nano-composite. The carbon material inherits the porous structure of ZIF and effectively improves the specific surfaces of the catalyst, the active site, the specific surface area of the material and the conductivity of the material are increased by adding the conductive graphene and the sulfur source, and the conduction of electrons is more facilitated. The obtained catalyst has good oxygen reduction (ORR) and oxygen evolution (OER) electrocatalytic activity in an alkaline medium, the electrocatalytic performance of the bifunctional oxygen catalyst is improved, and the bifunctional oxygen catalyst has potential application value in the fields of energy conversion and storage.

The invention relates to a preparation method of composite film layers and a method of using the same to remove tetracycline residue in pharmaceutical wastewater. The method is characterized by comprising: making GO (graphene) into GO solution, dissolving zinc nitrate and 2-methylimidazole respectively in methanol, mixing, adding the GO solution quickly into the mixed solution, stirring well, centrifuging, washing, drying to obtain ZIF-8 (zeolitic imidazolate framework)/GO composite powder, ultrasonically treating the composite powder to obtain a suspension, and binding the dispersed ZIF-8/GOsuspension and polyetherimide-modified microporous filter film by means of vacuum suction filtering to form ZIF-8/GO composite film layers different in thickness; using a vacuum suction filter to passpharmaceutical wastewater through the above composite film layers, and performing suction filtering repeatedly; tetracycline in the tetracycline is removed to 88.9-95.5%; the preparation method of the composite film layers and the method of using the same have the advantages that operations are simple, the cost of raw materials is low, recycling is facilitated, and the materials are reusable.

The invention discloses a cuprous oxide (Cu20)-metal organic frame (MOFs) composite material and a preparation method thereof. The preparation method of the cuprous oxide-mental organic frame composite material includes the steps of coating silicon dioxide (SiO2) on the surface of the cuprous oxide nanoparticles to protect the same, then coating the CU-20 and the SiO2 inside a ZIF-8 (zeolitic imidazolate framework) crystal, and finally selectively etching to remove the SiO2 so as to obtain the Cu20 and ZIF-8 in a sodium hydroxide solution. The cuprous oxide-metal organic frame composite material and the preparation method thereof have the advantages that with a simple chemical synthesis process to wrapping the unstable cuprous oxide nanoparticles into the MOFs crystal and obtain a sample of the Cu20 and ZIF-8 composite material, oxidation resistance of the material is significantly improved compared with the cuprous oxide nanoparticles, and the composite material can be applied to suchfield as catalysis; the preparation method thereof has the advantages of being simple and controllable, mild in conditions, environment-friendly, low in energy consumption and cost, and suitable forindustrial production.

The invention discloses zeolitic imidazolate frameworks (ZIFs) with an immobilized ionic liquid in cages and an application of the ZIFs. The ZIFs provided by the invention are composite materials formed by the ionic liquid and ZIFs. According to the ZIFs provided by the invention, the ionic liquid is introduced into the hollow cages of the ZIFs to change the cage diameter and the gas adsorption performance of the ZIFs, so that the ZIFs have wider application prospects in the fields of gas selective adsorption and molecular precision screening.

The invention provides a carbon-based ZIF (Zeolitic Imidazolate Framework) composite catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: 1, pretreating a carbon material, namely carrying out purification and acid treatment on the carbon material; 2, carrying out double-metal ZIF inductive growth, namely putting the carbon materialpretreated in the step 1 and an adhesive into a methanol solution of a transition metal salt, zinc nitrate and 2-methylimidazole, and carrying out a stirring reaction to obtain a precursor; 3, carrying out high-temperature carbonization, namely carrying out high-temperature carbonization on the precursor obtained in the step 2 in an inert atmosphere. As polyvinylpyrrolidone or polyethyleneimine is adopted as the adhesive, on one side, the surface of the carbon material can be modified, on the other hand, more transition metal ions can be captured uniformly from the surface, and homogeneous nucleation and growth of a ZIF on the surface of the carbon material can be induced. The carbon-based composite material provided by the invention has outstanding properties, is capable of replacing conventional rare metal catalysts, and in addition, the operation is simple, the raw materials are easy to obtain and the carbon-based composite material is easy to be popularized in related fields of electro-catalysis.

The invention provides a method for constructing a single-site electrocatalyst by a metal phthalocyanine molecular precursor and application. The method comprises subjecting a zeolitic imidazolate framework structure material and metal phthalocyanine molecules to coordination reaction; and subjecting a coordination reaction product to pyrolysis to obtain the electrocatalyst. The zeolitic imidazolate framework structural material includes a metal site to be coordinated and an imidazole nitrogen site to be coordinated. The method subjects the zeolitic imidazolate framework structural material (ZIFs) with high specific surface area and the metal phthalocyanine molecules with high stability to coordination reaction, significantly increases the number of active sites of the catalyst, and can avoid the aggregation of metal atoms. The prepared electrocatalyst has the advantages of high metal load capacity per site, good stability, and high catalytic activity.

Provided herein are composites made up of carbon-enriched open frameworks, and mechanochemical methods of producing such composites. Such open frameworks may include metal-organic frameworks (MOFs), including for example zeolitic imidazolate frameworks (ZIFs). Such composites may be suitable for use as electrode materials, or more specifically for use in batteries.

A preparation method for a metal organic framework ZIF (zeolitic imidazolate framework)-9 membrane for gas separation belongs to the field of material synthesis. The preparation method comprises: firstly modifying a porous alpha-Al2O3 carrier by using 3-aminopropyl-trimethoxysilane, wherein the carrier and the ZIF-9 membrane can be better connected together; and secondly, putting the modified carrier in mother liquor for synthesizing the ZIF-9 membrane, firstly raising the reaction temperature to 80 DEG C at a certain rate and maintaining the temperature for a period of time, raising the reaction temperature to 130 DEG C at a certain rate and maintaining the temperature for a period of time, and finally reducing the reaction temperature to room temperature, wherein the ZIF-9 membrane is synthesized. The membrane has a continuous, uniform and compact structure and represents a good gas separation performance.

A method is provided for forming a zeolitic imidazolate framework composition using at least one reactant that is relatively insoluble in the reaction medium. Also provided herein is a material made according to the method, designated either as EMM-19 or as EMM-19*, and a method of using same to adsorb and/or separate gases, such as carbon dioxide.