41 results about "Isomorphous substitution" patented technology

The invention discloses a preparation method of a highly dispersed hierarchical pore H-ZSM-5 molecular sieve of a framework metal. The preparation method comprises the following steps: treating carbonblack by oxidation treatment to prepare hydrophilic carbon black as a hard template; preparing a nanoscale double metal specie by a space limitation method as a metal source of doping the framework;synthesizing a metal framework doped hierarchical pore H-ZSM-5 molecular sieve by one-step in-situ hydro-thermal synthesis; and preparing an H type molecular sieve by means of Na type molecular sieveion exchange. The H-ZSM-5 molecular sieve prepared by the method retains the advantages of a microporous molecular sieve and regular mesoporous ducts are added in the structure, so that the mass transfer performance of the molecular sieve is improved. The method solves the problems of degree of crystallinity and destroy of active center of a parent body of the molecular sieve as a result of a post-treatment method. The active metal sites of the molecular sieve are increased by isomorphous substitution of the nano metal specie, so that the reaction performance of the catalyst is improved. The dosage of a reagent caused by regulating / modifying the molecular sieve structure for many times is saved, and the catalyst preparation process flow is shortened.

The invention relates to a nanoscale lamellar rare-earth hydroxide functional material and a preparation method thereof. According to the invention, the characteristic that metal ions are uniformly distributed in a lamellar rare-earth hydroxide laminate is utilized, rare-earth metal ions with similar radiuses are selected for carrying out isomorphous substitution, and a polyethyleneimine synthesis method is adopted for preparing the lamellar compound rare-earth hydroxide with the chemical formula of being RE2(OH)5Cl nH2O. Dimension of the prepared rare-earth hydroxide can be adjusted within the range from nanometer to micrometer, and isomorphous substitution by virtue of different rare-earth ions is carried out, thus a product can have a bright fluorescent light (blue light to near infrared light) with adjustable emission wavelength. According to the invention, a compound lamellar optical functional material system with uniform composition, adjustable dimension, good crystallinity, laminate rare earth ions which can be doped and exchangeable interlayer anions is constructed, and the preparation method is simple, practicable, rapid and convenient.

The invention discloses a metal-modified SAPO-5 / SAPO-34 composite molecular sieve, particularly, metal-modified lanthanide series metal isomorphous substitution. The invention further discloses a preparation method of the metal-modified SAPO-5 / SAPO-34 composite molecular sieve. When the metal-modified SAPO-5 / SAPO-34 composite molecular sieve is used for a reaction of preparing low carbon olefins by using organic oxygen-containing compounds, the composite molecular sieve has favorable catalytic activity, excellent propylene and butene selectivity and long service life.

The invention discloses a Ce isomorphous substitution LTL molecular sieve and a preparation method thereof. The preparation method of the Ce isomorphous substitution LTL molecular sieve comprises thefollowing steps that cerium source, potassium source, silicon source, aluminum source and water are mixed to obtain colloidal sol; the colloidal sol is aged and crystallized in turn, and obtained solid is treated and roasted in turn to obtain the Ce isomorphous substitution LTL molecular sieve. The molecular sieve product prepared by the method has higher crystallinity and a more regular shape; inthe product prepared by the method, cerium components are existed in the molecular sieve in the form of cage-construction cerium; the molecular sieve can be used for a carrier of a C6-C8 hydrocarbonalkyl aromatization reaction to significantly improve the hydrocarbon yield and liquid yield of the aromatization reaction, and has good industrialization prospects.

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.

An agent for searching for protein crystallization conditions, containing a water-swellable layered silicate having a fluorine atom and a hydroxyl group, wherein the fluorine atom is covalently bonded to the silicate by isomorphous substitution with the hydroxyl group. A method of searching for protein crystallization conditions, which comprises a step of mixing the agent for searching for protein crystallization conditions described above and a solution in which a protein is dissolved.

The invention relates to a preparation method for a microwave phosphorus ammonium type zeolite material for desulfurization waste water. The preparation method comprises the steps of (1) adding granular natural clinoptilolite into ammonium ion I type compound liquid for hydrothermal modification for 24 hours, and preparing ammonium type zeolites after flushing and drying; (2) dipping and washing the ammonium type zeolites in strong phosphoric acid, and drying the ammonium type zeolites for 6 hours; (3) putting the dried ammonium type zeolites in a microwave generator to conducting a solid-liquid phase isomorphous substitution reaction, washing and drying a product to prepare the microwave phosphorus modified ammonium type zeolites. The number of internal adsorption ducts of the microwave phosphorus ammonium type zeolites is increased, the adsorption caliber is increased, the structure is the structural basis of zeolite anion exchange, negative ions in the water can be removed through ion exchange, and the capacity of adsorbing organisms in the desulfurization waste water is greatly improved.

The disclosure describes a new class of isomorphously metal-substituted aluminophosphate materials with high phase purity that are capable of performing selective Brönsted acid catalyzed chemical transformations, such as transforming alcohols to olefins, with high conversions and selectivities using mild conditions. Isomorphous substitutions of functional metal ions for both the aluminum ions and the phosphorous ions were successful in various AlPO structures, along with multiple metal substitutions into a single aluminum site and / or a phosphorous site. This invention can be used towards the catalytic conversion of hydroxylated compounds of linear and / or branched moiety with the possibility of being substituted to their respective hydrocarbon products, preferably light olefins containing 2 to 10 carbon atoms, among other chemistries.

The invention relates to a preparation method of a lithium ion conductor-coated lithium cobaltate positive electrode material. The method is simple and easy to operate and is low in cost and short inconsumed time. According to the method, Nb ions are doped into the positive electrode material, isomorphous substitution is performed on Co ion sites in positive electrode material lattices, the lattice parameter is changed, and the electrochemical performance is favorable. After an inorganic rapid-lithium ion conductor precursor solution and a lithium ion battery positive electrode material are uniformly mixed under a certain temperature, the lithium ion battery positive electrode material of which a surface is coated with rapid-lithium ion conductor colloid is obtained, a uniform coating layer is formed on a surface of a positive electrode particle after thermal processing on the lithium ion battery positive electrode material of which the surface is coated with rapid-lithium ion conductor colloid, the transmission activity of lithium ions in the electrode material can be improved, an interface between an electrolyte and a positive electrode is improved, and the battery performance is improved.

The invention discloses a preparation method and application of a modified Y molecular sieve and a single-stage hydrocracking catalyst. The method comprises the following contents: (1) carrying out ammonium salt ion exchange on NaY zeolite as a raw material; (2) carrying out isomorphous substitution treatment on the Y molecular sieve in the step (1); (3) carrying out hydro-thermal treatment on the Y molecular sieve treated in the step (2); (4) carrying out acid dealumination treatment on the Y molecular sieve treated in the step (3); (5) carrying out fast drying treatment on the Y molecular sieve treated in the step (4); (6) carrying out carbon deposit reaction on the Y molecular sieve obtained in the step (5); (7) carrying out desilicication treatment on the molecular sieve obtained in the step (6); and (8) filtering and drying the Y molecular sieve subjected to desilicication treatment in the step (7) and carrying out charking treatment to obtain a modified Y molecular sieve. The single-stage hydrocracking catalyst prepared from the modified Y molecular sieve prepared through the method is applied to a single-stage hydrocracking process and has good reaction activity and nitrogen resistance.

The invention relates to a hydrotalcite-like type iron-promoted nickel-based catalyst for hydrogen preparation through autothermal reforming of acetic acid and a preparation method and provides a high-activity novel catalyst resisting oxidation, sintering and carbon deposition to solve the problem that existing catalysts are inactivated due to the structure change as well as oxidation and sintering of active components of the catalysts in the autothermal reforming process of acetic acid. The chemical component of the catalyst is (ZnO)a(NiO)b(AlO1.5)c(FeO1.5)d, wherein a ranges from 0.75 to 3.25, b ranges from 0.25 to 0.75, c ranges from 0 to 1.0 and d ranges from 0 to 1.0. The Zn-Al type carbonate hydrotalcite-like structure is prepared with a co-precipitation method to serve as a precursor, and an active component nickel and an auxiliary iron are introduced and enter the position of the hydrotalcite-like structure through isomorphous substitution of zinc for nickel and isomorphous substitution of aluminum for iron; a compound oxide obtained through sintering effectively inhibits possible migration, accumulation, oxidation and sintering of the active component nickel under the high-temperature reaction condition, and the activity and the stability of the catalyst are improved.

The invention discloses a metal-modified SAPO-5 / SAPO-34 composite molecular sieve, particularly, metal-modified lanthanide series metal isomorphous substitution. The invention further discloses a preparation method of the metal-modified SAPO-5 / SAPO-34 composite molecular sieve. When the metal-modified SAPO-5 / SAPO-34 composite molecular sieve is used for a reaction of preparing low carbon olefins by using organic oxygen-containing compounds, the composite molecular sieve has favorable catalytic activity, excellent propylene and butene selectivity and long service life.

The invention discloses a synthesis method of a Ga isomorphous substituted nanometer GaZSM-22 molecular sieve, and relates to a synthesis method of the nanometer GaZSM-22 molecular sieve. The invention aims to solve the problem that a GaZSM-22 molecular sieve prepared through an existing method is large in size. The synthesis method comprises the steps of (1) mixed gel preparation and (2) crystallization, wherein the Ga isomorphous substituted nanometer GaZSM-22 molecular sieve is obtained. The synthesis method has the beneficial effects that the Ga isomorphous substituted nanometer GaZSM-22 molecular sieve is rodlike nanometer crystals, the particle size is 20-50 nm, the grain length is 50-100 nm, a ratio of silicon to gallium is (25 to 45) to 1, and a molecular sieve skeleton does not contain aluminium atoms. The synthesis method is mainly used for conducting Ga isomorphous substitution to synthesize the nanometer GaZSM-22 molecular sieve.