632results about How to "Improve activity stability" patented technology

The invention discloses a method for producing lube base oil, which is characterized in that low-pressure hydroisomerization and adsorption treatment are adopted and organically combined, and the lube base oil meeting the standard of HVIW is obtained; the raw material firstly enters a low-pressure hydroisomerizing reactor, and the pour point is lowered; after gas-liquid separation of the heterogeneous product, adsorption treatment is done to the separated lube fraction for color enhancement and stability improvement. The invention has the advantages that adaptability of the raw oil is strong; operating condition is mild; investment and operating cost is low; and the prepared lube base oil meeting the standard of HVIW can be applied to blinding with various brands of high-grade lube.

The invention relates to a production method of epoxy chloropropane. The method provided in the invention comprises contacting 3-chloropropene with hydrogen peroxide with existence of titanium silicalite molecular sieve catalyst, alkaline additive and solvent, wherein, the temperature of contact between 3-chloropropene and hydrogen peroxide is raised from 10-55 DEG C to 65-100 DEG C, and the temperature raising velocity is 0.02-1 DEG C/h. Compared with the prior art, the method for producing epoxy chloropropane provided in the invention greatly enhances activity stability of catalyst, obviously reduces use cost and operation expenditure of catalyst; the technique process is simple and the implementation is convenient.

A catalyst for lightening the heavy arylhydrocarbon contains the metal in VIII family and composite carrier including ZSM-5 zeolite, mordenite and alumina. It can increase the transform rate of C9 aryhydrocarbon and output rate of xylene, and decrease the carbon deposit.

The invention discloses a preparation method of a catalytic combustion catalyst. The method comprises the following steps: firstly, performing hydrothermal pretreatment on a honeycomb ceramic matrix; secondly, soaking the honeycomb ceramic matrix with alumina sol; and finally, loading additives and precious metal active components. The catalyst coating obtained by the method of the invention has high bonding degree with the matrix, is difficult to crack and peel off and has less dosage of additives. Thus, the catalyst has good operational performance and activity stability and can maintain higher activity under the scouring of high space velocity airflow and thermal shock, so that the long-term stable operation of the catalyst can be ensured.

The invention discloses a method for preparing a Cu-SSZ-13 catalyst through an in-situ synthesis method. A Cu-SSZ-13 molecular sieve sample is prepared by taking acid as an exchange reagent and treating through an in-situ synthesis method. Compared with the currently used ammonium nitrate ion exchange method, the after treatment method for the Cu-SSZ-13 molecular sieve prepared through an in-situ synthesis method is more environment-friendly and effective; the activity of the prepared catalyst is higher; and the hydrothermal stability is better. According to the method, the silica-alumina ratio of the molecular sieve structure is increased while the catalyst having high catalytic activity is obtained; and the obtained Cu-SSZ-13 catalyst has excellent hydrothermal stability, wide temperature window and excellent N2 selectivity, and is very applicable to purification of tail gas from diesel cars.

The present invention relates to a non-noble metal oxide combustion catalyst and a preparation method and use thereof, and belongs to the technical field of energy utilization and environment protection. The catalyst is iron oxide, cobaltosic oxide, nickel oxide, cupric oxide, vanadium oxide, chrome oxide, manganese dioxide or cerium dioxide prepared according to the following steps: (1) using hydrothermal chemical synthesis to form a precursor of a catalyst; and (b) washing, filtering, shaping, drying and calcinating the obtained precursor of the catalyst, and finally forming a combustion catalyst or coating the precursor of the catalyst on a carrier to form a combustion catalyst. The catalyst prepared by the method can be used in catalytic combustion of methane and other VOC gas, and has the advantages that the synthesis process is simple, the cost is low, the catalytic activity and hydrothermal stability is high, and the light-off temperature and complete combustion temperature of methane are low.

Belonging to the technical field of sulfur recovery, the invention relates to a catalyst for selective reduction desulphurization, its preparation method and application. The catalyst is characterized in that: a catalyst active component is loaded on a carrier by means of an isometric immersion method, a multiple immersion method and an immersion precipitation method so as to obtain the catalyst; the catalyst carrier consists of coconut-shell activated carbon, fruit-shell activated carbon and coal-based activated carbon; the oxidation modifier of the catalyst carrier is one or a mixture of any of chloric acid, nitric acid, hydrogen peroxide or concentrated sulfuric acid; the active component of the catalyst is one or a mixture of any of CuO, NiO, Fe2O3, ZnO, Cr2O3, Co2O3, MnO2, and V2O5. The desulfurizer of the invention employs a selective reduction desulphurization technology to convert SO2 in flue gas into elemental sulfur. The preparation technology of the catalyst has the advantages of simplicity, easy control, low cost and long service life. Adoption of the activated carbon-based catalyst prepared in the invention for selective reduction desulphurization not only realizes high efficiency SO2 conversion rate and sulfur selectivity, but also effectively prevents secondary pollution.

The invention relates to a preparation method of a surface organic modified titanium carbide nanosheet, belonging to the technical field of preparation of nano materials. The preparation method comprises the following steps: etching an aluminum atom layer in titanium aluminum carbide by virtue of a mixed solution of lithium fluoride and hydrochloric acid so as to prepare titanium carbide precipitates, re-dispersing the titanium carbide precipitates into water, carrying out ultrasonic treatment and centrifugation so as to remove precipitates, and extracting supernatant liquid, so as to obtain titanium carbide nanosheet suspension liquid; and finally adding a surfactant water solution to react, so as to obtain the surface organic modified titanium carbide nanosheet. Compared with a method for etching titanium aluminum carbide by virtue of hydrofluoric acid, the method for preparing titanium carbide by etching the aluminum atom layer in titanium aluminum carbide by virtue of the mixed solution of lithium fluoride and hydrochloric acid has the advantages that the corrosivity is reduced, and the operation safety is improved; and the surface organic modified titanium carbide nanosheet prepared by virtue of the preparation method has relatively high surface activity and heat stability, has good compatibility with high-molecular materials and can be uniformly dispersed into the high-molecular materials, so that the mechanical properties, flame retardance and thermal properties of the high-molecular materials are improved.

The present invention discloses a preparation process of heavy oil hydrogenating, demetallizing and desulfruizing catalyst. Aluminum containing material in two different forms, including roasted alumina and dry aluminum hydroxide glue powder, is used. Of the assistant alkali metal element and/or alkali earth metal element, part is mixed with dry aluminum hydroxide glue powder and part is loaded onto the carrier via soaking process, so as to result in the inhomogeneous distribution of the assistant on the carrier. The catalyst has high demetalizing activity and desulfurizing activity, and highactivity stability, especially high desulfurizing activity stability. The catalyst may be used in the hydrodemetalizing and hydrodesulfurizing treatment of heavy oil and residual oil.

The invention relates to a Fischer-Tropsch synthesis catalyst, its preparation method and an application thereof. The catalyst comprises the following main components: Fe, a metal auxiliary component W, a Cu auxiliary agent, an alkaline auxiliary agent selected from Li, Na, K, Mg, Ca, Rb and Cs, and a structural promoter which contains at least one ingredient or any combination selected from SiO2, active carbon, Al2O3, ZrO2 and TiO2. The specific surface area of the catalyst provided by the invention is usually 50-240 m<2>/g. The catalyst can be prepared by a sol-gel method, a coprecipitation method, an immersion method or any combination of the above preparation methods, but preferably by a parallel flow precipitation method. The catalyst provided by the invention can be used in high selectivity production of hydrocarbons, oxygen-containing compounds and the like through Fischer-Tropsch synthesis of synthetic gas. its reaction activity and stability are obviously improved. And selectivity of light olefins in the Fischer-Tropsch synthesis product hydrocarbon is obviously raised.

The invention discloses a preparation method for emulsion-typed soybean protein isolate, which comprises the steps as follows: pre-crushed low-temperature defatted soybean flour (DSF) is taken as raw material and mixed with deionized water with the water/material ratio of 5-20w/w, is heated to 40-60 DEG C under alkali condition and leached for 20-30min so as to lead the soybean meal to expand by absorbing water; Acalase alkaline protease is added to carry out the enzymolysis; the bottom residue is removed by centrifuging so as to obtain soybean proteolysis supernatant; furthermore, the soybean proteolysis supernatant is homogenized and acidity is adjusted to PH 4.5; the protein in the soybean proteolysis supernatant is deposited and centrifuged for 10-20min; the obtained deposition is mixed with the deionized water by the water/material ratio of 3-5w/w; the mixed solution is adjusted to neutral by adding NaOH and frozen dryly or sprayed dryly so as to obtain the emulsion-typed soybean protein isolate. The process of the invention is simple and reliable, which remarkably improves the emulsion performance of the soybean protein.

The invention discloses a method for preparing a hydro-demetalization catalyst, which comprises the following steps of: (1) weighing two kinds of pseudoboehmite dry colloidal powder with different natures, evenly mixing, adding an extrusion aid, then, carrying out peptization, forming, drying, and roasting to prepare an alumina carrier; (2) preparing a dipping solution from a VIB metallic compound and/or a VIII metallic compound; and (3) dipping the alumina carrier prepared in the step (1) by using the dipping solution prepared in the step (2), drying an obtained wet catalyst, and then, roasting the catalyst in water-vapor-contained atmosphere to prepare the final catalyst. With the adoption of the method disclosed by the invention, the hydro-demetalization catalyst with a large pore diameter, large pore volume and concentrated pore distribution can be prepared under the condition of not using a pore-expanding agent.

A rare-earth contained super-stable Y zeolite is prepared from the super-stable Y zeolite containing sodium oxide (3-5 wt.%), rare-earth compound and water in wt ratio of 1:(0.001-0.5):(1-10) through preparing solution of rare-earth compound, mixing and the said Y zeolite, and grinding with shearing stress of at least 10 kg/cm2 for at least 1 min. Its advantages are higher hydrothermal stability, high stability of activity, and high resistance to sodium and heavy metal pollutions.

The invention discloses a propane dehydrogenation catalyst, which is obtained by loading metal platinum on magnesium aluminate spinel carriers, wherein the metal platinum of the catalyst is in a one-dimensional or two-dimensional highly dispersed state on the surface of the carrier; platinum atoms exist in a single atom or sub-nanometer cluster form; the particle diameter of the sub-nanometer cluster is smaller than 1nm. The invention also discloses a preparation method of the propane dehydrogenation catalyst. Compared with a catalyst prepared by the existing method, the obtained propane dehydrogenation catalyst has the advantages that the conversion rate and the selectivity are obviously improved; the stability is high; good application prospects are realized.

The hydrogenating and demetalization catalyst contains a alumina carrier and hydrogenating group VIB and group VIII metal component carried on the carrier, where the alumina carrier is gamma-alumina,which has such pore distribution that the pore volume of pores of 10-20 nm diameter accounts for 70-98 % of the total pore volume. The catalyst has high activity and high activity stability.

The invention provides tin-containing L zeolite. The chemical composition of the zeolite is (0.9-1.3)M.(0.01-0.3) SnO2.Al2O3.(5-7) SiO2, wherein M in a formula is K2O or a mixture of K2O and Na2O. The zeolite supporting noble metal is used for alkane aromatization reaction, and has good aromatization activity and stability.

The invention belongs to the technical field of waste water processing. An inorganic-organic compound-type adsorbent is prepared by compositing three natural materials of natural clinoptilolite, humic acid and chitosan. The method comprises the following specific steps of: performing pre-activation modification on the natural clinoptilolite, performing insolubility processing on humic acid, sufficiently mixing the processed clinoptilolite, insoluble humic acid and acidic chitosan solution according to a certain proportion, heating and drying through microwave, grinding and screening to prepare the inorganic-organic compound-type adsorbent with a loose porous structure, high surface activity and high ion exchanging performance. The prepared adsorbent is used for processing the industrial waste water with the concentration of Cr(VI) lower than 100mg/L, wherein the concentration of effluent Cr(VI) is lower than 0.5mg/L, which meets the requirement of the maximum permissible discharge concentration of the first type of pollutant in the national waste water comprehensive discharge standard. The method has easily obtained materials, simple processing technique and high processing efficiency, and is suitable for large-scale production.

The invention discloses a metal@BN core-shell structure nanometer catalyst for a synthesis gas methanation reaction, and a preparation method thereof. According to the present invention, the composition of the catalyst is 5-30wt.%Mx@(BN)y/SiO2, wherein metal M nanoparticles are loaded on a SiO2 support, the loading mass percentage is 5-30%, an ultrathin boron nitride (BN) layer is covered on the surface, the catalyst has a core-shell structure, and a molar ratio y/x of the BN to the metal nanoparticles is 0.1-10; with the application of the catalyst in the methane preparation reaction through the hydrogenation of the catalytic synthesis gas, the sintering and the loss of the metal nanoparticles can be prevented, and the catalyst deactivation caused by the carbon deposition on the catalyst active site surface can be prevented with the core-shell structure; and the catalyst has high low-temperature activity and high high-temperature stability.