62results about How to "Lower Diffusion Limits" patented technology

The invention provides a hydrogenation catalyst of distillate oil and a preparation method thereof. The catalyst comprises a carrier and at least a metal oxide which is selected respectively from VIII group and VIB group and is loaded on the carrier, wherein, the carrier is composed of aluminium oxide and a mesoporous molecular sieve SBA-15. The hydrogenation catalyst in the invention has the advantages of large specific surface, pore distribution concentration, high dispersion degree of active metal and good effects of desulfuration, denitrification and colloid removal.

The invention discloses a catalyst for straight-run naphtha aromatization and a preparation method thereof. The catalyst for straight-run naphtha aromatization is prepared by modifying a nano ZSM-5 molecular sieve, preparing a carrier and preparing the catalyst. The catalyst is suitable for treating raw materials with high alkane content. And the catalyst has high catalytic activity and high arene selectivity. So the catalyst can be applied to more mild process conditions and can be applied to production of high-octane gasoline blending components and chemical raw materials like benzene, toluene, xylene, etc.

A system for high-temperature reversible electrolysis of water, characterised in that it includes: a high-temperature reversible electrolyser, configured to operate in SOEC (solid oxide electrolyser cell) mode to produce hydrogen and store electricity, and/or in SOFC (solid oxide fuel cell) mode to withdraw hydrogen and produce electricity; a hydride tank, thermally coupled with the reversible electrolyser, the system being configured to allow the recovery of heat released by the hydride tank during hydrogen absorption in order to produce pressurised steam intended for entering the reversible electrolyser in SOEC mode, and to allow the recovery of heat released by the one or more outgoing streams from the reversible electrolyser in SOFC mode so as to allow the desorption of hydrogen from the hydride tank.

The invention discloses a preparation method of a macroporous alumina carrier. The method comprises the following steps: (1) preparing a solution containing grease and organic acid, an acidic aluminum solution and a basic aluminate solution, and respectively marking into a solution A, a solution B and a solution C; (2) combining the solution B and the solution C to perform gelation reaction, regulating pH to be 9.0 to 11.0, wherein the pH is preferably is 9.5 to 10.5; controlling the reaction temperature to be 60 to 95 DEG C, wherein the reaction temperature is preferably 75 to 85 DEG C; performing ageing, filtering, washing and drying after the gelation reaction, wherein the solution A is added before or during gelation; the solution A, the solution B and the solution C are preferably combined to perform the gelation reaction; (3) forming the material obtained in step (2), and then drying and roasting to obtain the macroporous alumina carrier, The macroporous alumina carrier prepared by the method has the advantages of being large in aperture, large in pore volume and high in strength.

The invention discloses a residual oil hydrotreating catalyst and a preparation method thereof. In the catalyst, the active metal constituents are Group VIII metals and Group VIB metals; and the supporter is composed of aluminum oxide and mesoporous molecular sieve, wherein the mesoporous molecular sieve accounts for 4.5-9.5 wt% of the supporter. In the catalyst supporter preparation process, a proper amount of alkaline nitrogen-containing compound is added into the raw materials quasi-boehmite, aluminum oxide powder and mesoporous molecular sieve; and due to the actions of blending and sintering, the prepared catalyst has large specific area, large pore size and proper pore structure, reduces the diffusion restriction of the reactants, is suitable for catalyzing macromolecule-participated reactions, has proper acid value and improved wear resistance, and maintains the desulfurization activity on the premise of enhancing the hydrogenation demetallization and deasphaltenizing activities.

A micropillar array structure includes a substrate; and an array of micropillars provided on a surface of the substrate, wherein the micropillars are substantially transparent to light, and the height of micropillars is at most 500 μm. The micropillar array structures can be used in optoelectronic devices such as solar cells.

The invention relates to preparation of a nano gel immobilized multienzyme system. The preparation method comprises the following steps: constructing a nano gel-multienzyme assembling system by using a nano gel dispersion-adsorption immobilized enzyme technology, carrying out self-coupling, and catalyzing by multiple enzymes to synthesize the 1,3-propylene glycol. The nano gel suspension, which can be evenly dispersed in the water solution, is prepared to directly absorb the immobilized multienzyme system. The method can effectively inhibit the aggregation and enhance the dispersibility; the invention fully displays the excellent properties of nano gel carrier, such as high specific surface and the like, provides a location for simultaneously coupling multiple biological enzymes (multienzyme immobilization), and reduces the influence of the carrier on the dispersion of a substrate and products; and compared with the microbe fermentation method, the invention has the advantages of low cost, simple reaction, no cell pollution and the like, and the nano gel immobilized multienzyme system can not be easily degraded by the microbes. The invention provides a new effective catalytic method for synthesizing nano gel immobilized enzymes.

The invention discloses a preparation method of a ZnO-ZrO2@SAPO-34 core-shell catalyst. The preparation method comprises the following steps: preparing ZnO-ZrO2 powder; according to a molar ratio of raw materials, namely Al2O3, P2O5, SiO2, MOR (morpholine) and H2O, of 1.0:0.8:0.6:2.5:80, sequentially adding pseudoboehmite, tetraethyl orthosilicate and a templating agent morpholine into an orthophosphoric acid solution while stirring, continuously stirring uniformly, stirring and aging at room temperature for 24h to form a sol system, adding the ZnO-ZrO2 powder into the system according to a core-shell mass ratio of ZnO-ZrO2 to SAPO-34 of 1:4 to 4:1, continuing stirring uniformly, then transferring to a reaction kettle, performing hydrothermal crystallization at 190-210 DEG C for 24-48h, cooling, filtering, washing by using deionized water till a neutral state, drying at 105 DEG C for 6h, and roasting at 500-600 DEG C for 3h to obtain the ZnO-ZrO2@SAPO-34 core-shell catalyst. The catalyst prepared by the preparation method provided by the invention can simultaneously increase the carbon dioxide conversion rate and the low-carbon olefin selectivity in a two-step technology in which the low-carbon olefin is prepared from methanol through CO2 hydrogenation.

The invention discloses a preparation method of a ZnO-ZrO2@Al2O3@SAPO-34 dual-core-shell catalyst. The preparation method comprises the following steps: preparing ZnO-ZrO2@Al2O3 powder; taking Al2O3,P2O5, SiO2, MOR and H2O in a molar ratio of 1.0:0.8:0.6:2.5:80; adding pseudo-boehmite, ethyl orthosilicate and a template agent morpholine to an orthophosphoric acid solution sequentially while stirring, performing uniform stirring continuously, and performing stirring and aging for 24h at room temperature to form a sol system; adding 200-400-mesh ZnO-ZrO2@Al2O3 powder to the system according tothe core-shell mass ratio of ZnO-ZrO2@Al2O3: SAPO-34 of (1:4)-(4:1), performing uniform stirring continuously, and then, transferring the product into a reactor; and performing hydrothermal crystallization for 24-48h at 190-210 DEG C, performing cooling and filtration, performing washing to neutrality with deionized water, performing drying for 6h at 105 DEG C, and performing roasting for 3h at 500-600 DEG C to obtain the catalyst. The catalyst prepared by the preparation method disclosed by the invention can simultaneously improve the conversion rate of carbon dioxide and the selectivity of low-carbon olefin in a two-step process for preparing low-carbon olefin by CO2 hydrogenation through methanol.

The invention discloses a method for preparing a gamma-Al2O3@CuO-ZnO@SAPO-34 dual-core-shell catalyst. The method comprises the steps: preparing gamma-Al2O3@CuO-ZnO powder; and proportioning raw materials, i.e., Al2O3, P2O5, SiO2, MOR and H2O according to a mole ratio of 1.0: 0.8: 0.6: 2.5: 80, sequentially adding pseudo-boehmite, ethyl orthosilicate and a template agent, i.e., morpholine into anorthophosphoric acid solution with stirring, carrying out uniform stirring continuously, carrying out aging for 24h with stirring at room temperature to form a sol system, adding gamma-Al2O3@CuO-ZnO powder into the system according to a core-shell mass ratio, i.e., gamma-Al2O3@CuO-ZnO: SAPO-34 of (1: 2) to (2: 1), carrying out uniform stirring continuously, then, transferring the mixture into a reactor, carrying out hydrothermal crystallization for 24 to 48 hours at the temperature of 190 DEG C to 210 DEG C, carrying out cooling, carrying out filtering, carrying out washing with deionized water until washing water is neutral, carrying out baking for 6h at the temperature of 105 DEG C, and carrying out roasting for 3h at the temperature of 500 DEG C to 600 DEG C, thereby preparing the gamma-Al2O3@CuO-ZnO@SAPO-34 dual-core-shell catalyst. The catalyst prepared by the method can be used for simultaneously improving conversion ratio of carbon dioxide and selectivity of low-carbon olefins in a two-step method process for preparing the low-carbon olefins from methanol through CO2 hydrogenation.

The invention discloses a molecular sieve packaged core-shell catalyst (Figure 1) and a preparation method thereof, and relates to the field of catalyst preparation. According to the core-shell catalyst, an inner core is CuPt/SSZ-39, a shell is hierarchical pore Silicalite-1, the catalyst is prepared from CuPt/SSZ-39, a silicon source and a quaternary ammonium salt structure-directing agent through a hydrothermal synthesis method, and the inner core is prepared by dipping an SSZ-39 molecular sieve in a CuPt bimetallic precursor solution; the modified SSZ-39 molecular sieve is prepared by modifying an SSZ-39 molecular sieve with a silane coupling agent. The CuPt bimetallic nanoparticles in the catalyst prepared by the invention are anchored on the surface of the modified SSZ-39 molecular sieve and encapsulated in the shell of the hierarchical pore Silicalite-1 molecular sieve, so that the activity and sintering resistance of the catalyst are remarkably improved, and the catalyst can be applied to the fields of petrochemical engineering, fine chemical engineering and the like.

The invention relates to the field of molecular sieves, and discloses a titanium-silicon molecular sieve, a preparation method and an application thereof, and a propylene epoxidation method. In the SEM image of the titanium-silicon molecular sieve, the crystal grains of the titanium-silicon molecular sieve have a plate-shaped shape, the thickness of the crystal grains of the titanium-silicon molecular sieve is 500-5000 nm, and the crystal grains of the titanium-silicon molecular sieve meet the following conditions: the ratio of a:c is (2-10):1, and the ratio of b:c is (1-5):1, wherein a represents the length of the crystal grains, b represents the width of the crystal grains, and c represents the thickness of the crystal grains. The preparation method of the titanium-silicon molecular sieve comprises the following steps: (1) contacting a silicon source, a titanium source, tetrapropylammonium bromide, an alkali source and water to obtain a mixture; and (2) hydrothermally crystallizing the mixture, drying or not drying a solid product obtained by hydrothermal crystallization, and calcining the solid product. The molecular sieve can improve the catalytic activity and selectivity of molecular sieves when used for the propylene epoxidation process, and the method can effectively reduce the production cost.

The invention relates to a visible-light-induced photocatalyst, in particular to a preparation method of a hierarchical hollow silicon dioxide confinement cuprous oxide visible-light-induced photocatalyst. The preparation method comprises the following steps: firstly, uniformly loading copper ions on the surface of CPS@SiO2 in an adsorption-evaporation drying manner; preparing a SiO2 outer layer (CPS@SiO2-Cu<2+>@SiO2) by taking CPS@SiO2-Cu<2+> as a template, calcining at a high temperature to remove the CPS template, finally regulating the temperature, and reducing copper oxide into cuprous oxide in an Ar/H2 atmosphere. The prepared visible-light-induced photocatalyst is used for achieving the purpose of efficiently and selectively reducing nitro-aromatic hydrocarbon into corresponding aniline, and the technical problem that an existing photocatalyst cannot achieve efficient and selective reduction of the nitro-aromatic hydrocarbon in a visible-light and pure-water system is solved.

The invention relates to a layer structure catalyst for directly preparing ethylene, propylene and butene through hydrogenation of carbon dioxide. The layer structure catalyst for directly preparing the ethylene, the propylene and the butene through hydrogenation of the carbon dioxide is prepared in the steps of mixing iron nitrate nonahydrate, potassium carbonate and titanium dioxide under a certain condition and then calcining an obtained mixture at a certain temperature for two times by using a high temperature solid state method so as to prepare the layer structure catalyst. The layer structure catalyst for directly preparing the ethylene, the propylene and the butene through hydrogenation of the carbon dioxide has the advantages that a stable layer structure is obtained, the layer structure can be stably kept before and after the reaction of directly preparing the ethylene, the propylene and the butene through hydrogenation of the carbon dioxide, olefin secondary reaction caused by readsorption of primary olefin is inhibited to a certain degree, and high olefin selectivity is realized in the reaction of preparing low carbon olefin through hydrogenation of the carbon dioxide. Apreparation method is simple and environmentally friendly and has potential application values.

The invention belongs to the fields of the material chemistry and the catalytic chemistry, and discloses a molecular sieve aggregate. The molecular sieve aggregate comprises molecular sieve nanoparticles and mesoporous particles, wherein the surfaces of the molecular sieve nanoparticles have negative charges, the surfaces of the mesoporous particles have positive charges, and the molecular sieve aggregate is obtained by the combination of the molecular sieve nanoparticles with the mesoporous particles through an electrostatic action. The invention also discloses a preparation method of the molecular sieve aggregate. The preparation method comprises the following steps: respectively synthesizing the molecular sieve nanoparticles and the mesoporous particles, adding the mesoporous particles to the molecular sieve nanoparticles, stirring, and filtering to obtain the molecular sieve aggregate. The preparation method has the advantages of simple steps and easy operation; and the molecular sieve aggregate has the advantages of substantially improved molecular sieve specific surface area and maintenance of the catalytic performance of traditional molecular sieves.

The invention relates to a two-dimensional carbon nano carrier material as well as a preparation method and application thereof. The double-sided amphiphilic carrier provided by the invention comprises hydrophilic layer-shaped multilayer carbon nanosheets and a metal sulfide, and the metal sulfide is selectively modified on one side of each single-layer nanosheet. The invention aims to solve the technical problems in the prior art. The double-sided amphiphilic carrier provided by the invention has a hydrophilic interface and a hydrophobic interface at the same time; with maintained enzyme loading capacity, the carrier can stably exist on an interface of an oil phase and a water phase, interface catalysis of enzymes is facilitated, the enzyme catalytic activity is improved, meanwhile. The invention further provides a preparation method and application of the carrier, and the carrier can be used as a carrier of immobilized enzymes.

The invention relates to the technical field of alkane isomerization catalysts, in particular to a preparation method and application of a hierarchical pore SAPO-11 molecular sieve and a long-chain alkane isomerization catalyst. The preparation method comprises the following steps: adding water, low-carbon alcohol, a Gemini surfactant and an organic pore-forming agent into a reaction kettle; thenadding phosphoric acid, a template agent and silica sol, conducting stirring, then putting the stirred material into a kettle for crystallization, washing, drying and roasting a crystallization product, then adding a binder and a molding aid for extrusion molding, loading a certain amount of active components on a carrier obtained by extrusion molding, and conducting drying and roasting to obtainthe long-chain alkane isomerization catalyst. In the preparation process, the low-carbon alcohol, the Gemini surfactant and the organic pore-forming agent are introduced to obtain the hierarchical pore SAPO-11 molecular sieve with small particle size, and the alkane isomerization catalyst prepared by taking the hierarchical pore SAPO-11 molecular sieve as the carrier is developed in pore passage and excellent in mass transfer performance, and has good isomerization activity and selectivity when being used for isomerization of long-chain alkane.