31results about How to "Eliminates washing steps" patented technology

The invention discloses a preparation method for an SCR catalyst for purifying oxynitride in motor vehicle exhaust .The preparation method includes the steps of preparation of an SSZ-13 molecular sieve, preparation of a Cu-SSZ-13 catalyst and preparation of an integrated SCR catalyst .The preparation method is simple, production cost is lowered, SSZ-13 crystallization time is short, crystallization is relatively pure, HN3-SCR catalytic activity is high, and the purification rate of oxynitride in motor vehicle exhaust is high.

The invention discloses a method for extracting total DNAs of soil microorganisms at high purity. CTAB (Cetyltrimethyl Ammonium Bromide), lysozyme, protease and SDS (Sodium Dodecyl Sulfonate) act together to perform lysis of cells and simultaneously freeze and thaw the cells repeatedly; therefore, an excellent cell lysis effect is achieved; the humic acid is removed by utilizing PVP (Polyvinyl Pyrrolidone), CaC12 and BSA (Bull Serum Albumin); and the DNAs are precipitated by utilizing isopropanol so that the purity of the obtained DNAs is high. The method is simple and convenient; and without being purified, the DNAs obtained by the method can be used for subsequent PCR (Polymerase Chain Reaction) analysis and DGGE (Denaturing Gradient Gel Electrophoresis) analysis. The purity of the extracted DNAs meets the requirement for directly performing subsequent molecular biological research; the extracted DNA segments can be subjected to 16SrDNA amplification and DGGE atlas analysis; glue cutting recovery and basic group sequencing can be performed on specific stripes of the DGGE band; unknown bacteria can be identified through comparison with the conventional sequences in an RDP (Ribosomal Database Project) database or by establishing a new sequence probe; and therefore, the structural composition of the microbial community can be determined, and a foundation can be laid for researching the structural diversity and ecological functions of the soil microorganisms in the rhizosphere of the mulberry in future.

The invention discloses a method for extracting total DNA (deoxyribonucleic acid) of mulberry rhizosphere soil microorganisms by adopting a plurality of measures, which can achieve a good cell lysis effect by utilizing PVP (polyvinyl pyrrolidone) prewashing to remove humic acid, the synergy of CTAB (cetyltrimethyl ammonium bromide), lysozyme, protease and SDS (sodium dodecyl sulfate) to lyse cells and repetitively freezing and thawing the cells at the same time and utilizes PEG8000 to precipitate DNA, so that the purity of the obtained DNA is high. The adopted method is simple and convenient, and the DNA can be used in subsequent PCR (Polymerase Chain Reaction) analysis and DGGE (denaturing gradient gel electrophoresis) analysis without needing to be purified. The extracted DNA is so pure as to meet the requirement of direct subsequent molecular biology research, an extracted DNA fragment can be used in the amplification and DGGE map analysis of 16SrDNA, moreover, the specific band gel extraction and base sequencing of a DGGE band can be carried out, comparison with the sequence existing in an RDP (ribosomal database project) database can be carried out, or a new sequence probe can be established to identify unknown bacteria, so that the composition of a microbial community structure can be determined, and thereby laying a foundation for the future research of the community structure diversity and the ecological functions of the mulberry rhizosphere soil microorganisms.

The invention relates to the technical field of in-vitro diagnosis, and in particular relates to a quantitative detection method for gamma-interferon and a kit. The quantitative detection method for the gamma-interferon disclosed by the invention comprises the following steps: (1) preparing a fluorescent trapping microsphere by adopting a carbodiimide method; (2) releasing the gamma-interferon in vitro; (3) combining the fluorescent trapping microsphere with the gamma-interferon; (4) preparing an antigen-antibody complex; and (5) quantitatively detecting. The quantitative detection kit for gamma-interferon disclosed by the invention comprises the fluorescent microsphere, a coupling buffer solution, carbodiimide, an NHS activating agent and a fluorescein labelled anti-human gamma-interferon antibody. The quantitative detection method for the gamma-interferon and the kit, disclosed by the invention, are simpler to operate; and simultaneously, quantitative detection of the gamma-interferon is realized effectively.

The present invention relates to a method for preparing ascorbic acid aliphatic ester, and said method includes the following steps: preparing a mixture containing 95-100 wt% of sulfuric acid, ascorbic acid and aliphatic acid, making the described mixture produce reaction to obtain the reaction produce mixture containing ascorbic acid aliphatic ester, and separating out ascorbic acid aliphatic ester from it, the mole ratio of ascorbic acid and aliphatic acid is 1 to less than 1.25, and the weight ratio of sulfuric acid and ascorbic acid is at least 6. The reaction mixture is mixed with ice whose volume dose is 2-10 times that of sulfuric acid and / or water whose temp. is below 5 deg.C, then mixed with an aromatic hydrocarbon solvent, and said mixture is hented, and cooled to obtain an organic phase, said organic phase is filtered and dried so as to obtain a solid, i.e. the invented product.

The invention discloses a method for extracting total DNAs (Deoxyribonucleic Acid) of soil microorganisms through PVP (Polyvinyl Pyrrolidone) pretreatment. Humic acid is removed through PVP pre-washing; CTAB (Cetyltrimethyl Ammonium Bromide), lysozyme, protease and SDS (Sodium Dodecyl Sulfonate) act together to perform lysis of cells and simultaneously freeze and thaw the cells repeatedly; therefore, an excellent cell lysis effect is achieved; and the DNAs are precipitated by utilizing isopropanol so that the purity of the obtained DNAs is high. The method is simple and convenient; and without being purified, the DNAs obtained by the method can be used for subsequent PCR (Polymerase Chain Reaction) analysis and DGGE (Denaturing Gradient Gel Electrophoresis) analysis. The purity of the extracted DNAs meets the requirement on directly performing subsequent molecular biological research; the extracted DNA segments can be subjected to 16SrDNA amplification and DGGE atlas analysis; glue cutting recovery and basic group sequencing can be performed on specific stripes of the DGGE band; and unknown bacteria can be identified through comparison with the conventional sequences in an RDP (Ribosomal Database Project) database or by establishing a new sequence probe; and therefore, the structural composition of the microbial community can be determined, a foundation can be laid for researching the structural diversity and ecological functions of the soil microorganisms in the rhizosphere of the mulberry in future.

The invention discloses a preparation method of a lithium ion battery positive electrode composite material and a precursor thereof, and in particular relates to a novel method for preparing a high-purity low-cost binary or ternary precursor and preparing a high-performance lithium ion battery binary or ternary positive electrode composite material by utilizing the precursor, belonging to the technical field of new energy materials and the preparation thereof. The method comprises the following specific steps: (1) putting salt-type solid raw materials of two or three of nickel, cobalt and manganese with crystal water into a reactor, and heating the materials to the molten state; (2) introducing ammonia under the protection of inert gas, supplementing a small amount of water or no water according to the solubility of salts at different temperatures, stirring and reacting; (3) evaporating ammonium salt after full reaction, taking the solid out, and drying so as to get the amorphous binary or ternary positive electrode composite material precursor; and (4) mixing the precursor with lithium carbonate according to a certain ratio, and further preparing the lithium ion battery positive electrode composite material through a two-section sintering method. The precursor synthetic method is simple, sodium hydroxide is avoided from being used, separation and purification are not required, and the high-purity positive electrode composite material precursor which has no impurities basically can be obtained; furthermore, no industrial waste water is discharged, and the by-product ammonium salt can further generate economic benefit; and the positive electrode composite material prepared by the precursor has excellent performances, and is convenient for industrialization.

The invention relates to the field of graphite intercalation materials, and discloses a graphite intercalation method, a graphite intercalation product prepared by the method and a hydrocarbon oxidation method. The graphite intercalation method comprises the following steps: in a moving bed reactor, under an intercalation reaction condition, enabling graphite used as a raw material to contact withan intercalating agent, wherein at least part of the intercalating agent is in a gas phase, and the intercalation reaction conditions are as follows: the temperature is 200 DEG C or above. The graphite intercalation method provided by the invention is carried out in the moving bed reactor, continuous operation can be realized, a washing step can be omitted, and industrial production is facilitated. The graphite intercalation product prepared by the method has improved catalytic activity on oxidation reaction of hydrocarbon substances, particularly complete oxidation reaction, so that not onlycan higher hydrocarbon substance conversion rate be obtained, but also the temperature of the oxidation reaction can be effectively reduced.

The invention discloses a method for total DNA extraction and diversity analysis of ship ballast water microorganisms. The method comprises the steps that according to the characteristics of ship ballast water, two-level filtering and refrigerating fixation is performed by using millipore filtration membranes of 3 micrometers and 0.22 micrometer, and adhering of the microorganisms to the filtration membranes is reinforced; the microorganisms are processed by using cetyltrimethyl ammonium bromide (CTAB) to enable the total DNA purity of the obtained microorganisms to meet the requirements of directly performing subsequent molecular biology study; 16SrDNA amplification and denaturing gradient gel electrophoresis (DGGE) can be performed on extracted DNA fragments, and the diversity degree of ship ballast water microorganism populations can be judged after digitalization analysis is performed on electrophoretogram; the varieties of dominant bacterial populations of the ballast water is obtained by performing rubber tapping recovering, clone sequencing and BLAST sequence alignment on special bands, and therefore the structual components of the microorganism populations are determined. According to the method, a basis is laid for studying the diversity and ecological function of the microorganisms in the ship ballast water and sediment.

A process for producing thermally inhibited starch, specifically thermally inhibited non- pregelatinized granular starch, is described, resulting in a viscostable starch product. The process comprising providing an alkaline starch, specifically an alkaline non-pregelatinized granular starch,having a pH of at least 8; subjecting the starch to a hydrothermal treatment, specifically to obtain a hydrothermally treated non-pregelatinized granular starch, said hydrothermal treatment being at a temperature of 45-200DC with steam at a steam pressure of 0.1-15 bar or a gas mixture comprising water vapor at a partial water vapor pressure of 0.1-1 bar; dehydrating the starch, specifically the hydrothermally treated non-pregelatinized granular starch,to a moisture content of 2 wt% or lower and subjecting the starch to a thermal treatment by heating the starch to a temperature of 120-190DC to obtain viscostability,cooling and optionally further processing the starch.

The invention discloses a new method for detecting immune complexes by size-exclusion chromatography, which adopts a double-antigen or double-antibody sandwich method for detection, and specifically includes the following steps: 1) selecting carrier particles, and coating the surface of the carrier particles with detection antigen / Antibody, label the paired antigen / antibody with a marker; 2) Add the carrier particles coated with the detection antigen / antibody, the antigen / antibody with the marker, and the sample to be tested into the reaction container at the same time; 3) Incubation and centrifugation; 4) Detected by a detector. Compared with traditional ELISA and CLIA, the new method of size exclusion chromatography detection of immune complexes of the present invention saves washing steps, is easy to operate, and shortens the detection time; antigen and antibody belong to the same phase reaction in the microcolumn cavity, and the reaction is sufficient , to avoid the shortcomings of insufficient heterogeneous reaction of ELISA; compared with MGIA, the use of fluorescent and other immunolabeling assays amplifies the signal, greatly improves the sensitivity, and has a wider range of applications.

The invention discloses an impurity-free Preyssler-type heteropoly acid and a preparation method thereof, belonging to the field of heteropoly acid preparation. The preparation method of the Preyssler type heteropolyacid comprises the following steps: adding phosphoric acid to the aqueous solution of sodium tungstate, and then reacting at 100-140° C. in the reactor for 12-24 hours, and the molar ratio of phosphoric acid to sodium tungstate is 4- 10:1; after cooling to room temperature, add ammonium chloride for suction filtration; wash with methanol solution and recrystallize; add a small amount of sorbic acid and ion-exchange the heteropolyacid solution; finally, vacuum dry the eluent. The preparation method of the impurity-free Preyssler-type heteropolyacid does not add any potassium ions, and at the same time saves the potassium acetate washing step, avoids the introduction of potassium ions into the product, and improves the yield and purity of the finished heteropolyacid, In addition, the preparation method has the advantages of simple process and convenient operation, and is suitable for industrialized large-scale production.

The invention discloses a fluidized bed hydrogenation catalyst and a preparation method thereof. The preparation method comprises the following steps: (1) preparing an alumina carrier; (2) mixing the alumina carrier with a first active metal solution, and drying to obtain a catalyst precursor A; and (3) introducing a second active metal component to the catalyst precursor A, and drying and roasting to obtain the catalyst. According to the preparation method of the fluidized bed hydrogenation catalyst, active metal is added in the preparation of the carrier for effective adsorption and occupation, so that the dispersion of the metal is further optimized, and the fluidized bed hydrogenation catalyst which is high in unit surface acid content, wear-resistant and good in hydrodesulfurization performance is prepared.

The invention discloses a method for extracting and analyzing the total DNA of microorganisms in ship's ballast water; according to the characteristics of ship's ballast water, the present invention uses two-stage filtration and freeze-fixation of 3 μm and 0.22 μm microporous membranes to strengthen the For the attachment of microorganisms on the filter membrane, the purity of the total DNA of microorganisms obtained by treating with cetyltrimethylammonium bromide (CTAB) meets the needs of direct subsequent molecular biology research, and the extracted DNA fragments can be amplified for 16SrDNA And denaturing gradient gel electrophoresis (DGGE). After digital analysis of the electrophoresis graph, the diversity of microbial populations in the ship’s ballast water can be judged. The specific bands are cut and recovered by gel cutting, cloned and sequenced, and BLAST sequence comparison is performed to obtain the ballast water. The types of water-dominant bacterial flora can be determined to determine the structure and composition of microbial communities, which will lay a foundation for future research on microbial diversity and ecological functions in ship ballast water and sediments.

The invention relates to an accurate immune sensing method with an adjustable linear range and a portable biological resistance sensing measurement device.The detection device comprises a detection pipeline, one end of the detection pipeline is connected with a vacuum pump through threads, a liquid suction head is arranged at the other end of the detection pipeline, a micro-channel is formed in the detection pipeline, and a battery is arranged on the side face of the detection pipeline; the battery provides power for the concentration measurement module, two detection electrodes are arranged in the measurement module and connected to the two sides of the micro-channel respectively, a kit is arranged in the joint of the detection pipeline and the gun head, and a vibration device is arranged on the detection pipeline on the outer side of the kit. According to the present invention, the detection limit linear range is adjustable, the sensitivity is high, the stability is good, the detection cost is low, and the detection speed is fast; high pressure generated by the vacuum pump is matched with filtration of the microporous filter membrane, so that the problems of blockage of large-particle non-to-be-detected substances in the microchannel and adsorption, aggregation and blockage of to-be-detected substances in the microchannel can be well solved.

The invention discloses a method for preparing a positive composite positive material precursor for lithium ion batteries, and the method is simple and convenient in technology. The method comprises the following specific steps: (1) putting any two or three salt solid raw materials of nickel, cobalt and manganese with crystal water into a reactor, and heating to a molten state; (2) introducing ammonia gas under inert gas shielding, carrying out pressurization until 1.2 to 1.4 Mpa, appropriately supplementing a small mount of water or not adding water according to the solubility of the salt atdifferent temperatures, and reacting while stirring; (3) evaporating ammonium salt after the reaction is completed, taking out a solid, and drying to obtain an amorphous binary or ternary positive composite material precursor; and (4) mixing the precursor with lithium carbonate in proportion, and carrying out a two-stage sintering process to prepare the positive composite material for lithium ionbatteries. The positive composite material prepared by the precursor is excellent in performance, and is convenient for industrialization.

The invention discloses impurity-free Preyssler type heteropolyacid and a preparation method thereof, and belongs to the field of heteropolyacid preparation. The preparation method of the impurity-free Preyssler type heteropolyacid comprises the following steps: adding phosphoric acid into an aqueous solution of sodium tungstate, and then reacting for 12-24 hours at 100-140 DEG C in a reaction kettle, wherein the molar ratio of phosphoric acid to sodium tungstate is (4-10): 1; after cooling to room temperature, adding sodium chloride for suction filtration; washing with a methanol solution andrecrystallizing; adding a small amount of sorbic acid and carrying out ion exchange on the heteropolyacid solution; and finally, carrying out vacuum drying on the eluent. According to the impurity-free Preyssler type heteropolyacid preparation method, no potassium ions are added, meanwhile, the potassium acetate washing step is omitted, introduction of the potassium ions into the product is avoided, the yield and purity of the heteropolyacid finished product are improved, and the preparation method is simple in process, convenient to operate and suitable for industrial large-scale productionand use.

The invention relates to a ready-to-resuscitate cryoprotectant for erythrocytes and a use method thereof, and relates to the field of cell technology. The composition of the cryoprotectant for erythrocytes provided by the invention includes 0.25-0.3mol / L trehalose, 5-7% (v / v ) of dimethyl sulfoxide, 1~3% (v / v) of human serum albumin. The erythrocyte cryoprotectant provided by the invention has simple components, and it is not necessary to strictly control the mixing speed between the erythrocytes and the erythrocyte cryoprotectant when the cells are frozen, just mix them directly, and the cryopreservation method is simple and time-consuming. The cryopreserved red blood cells of the present invention can be used without washing after resuscitation, which saves the tedious and time-consuming washing steps in the glycerol cryopreservation method and meets the needs of emergency blood users.

The invention relates to a method for preparing a white carbon black / solution-polymerized styrene-butadiene rubber nano composite material. In the invention, nano white carbon black powder and silanecoupling agent are fully mixed and condensation reaction is carried out at high temperature, organic modified nano white carbon black powder is obtained and added into solution-polymerized styrene-butadiene; the mixture of the white carbon black powder and solution-polymerized styrene-butadiene is stirred and removes solvent and then dried, thus obtaining the silicon dioxide / solution-polymerized styrene-butadiene rubber nano composite material prepared by co-polymerization. The invention expands the range of methods for preparing the nano composite material with solution composition. The adopted method using the organically modified white carbon black is simple and easy for operation and the solution composite technique is fast and convenient with low cost. The prepared co-polymerized rubber can be taken as master batch and is added with the white carbon black or added with other fillings for preparing novel nano composite material. The physical and mechanical properties and dynamic mechanical property of the rubber prepared by the method are better than the properties of coordinative amount of filling prepared by mechanical mixing method and the composition speed of subsequent fillings of the rubber prepared by the method is faster than that prepared by the mechanical method.

The invention discloses a regeneration method for iron oxide desulfurizer. The regeneration method comprises the following steps: (1) conducing oxidation treatment on the iron oxide desulfurizer through which sulphur penetrates, and mixing the oxidized iron oxide desulfurizer with catalyzed and cracked diesel oil at 40 to 150 DEG C for 0.1 to 10 hours, preferably, 1 to 3 hours; (2) conducting solid-liquid separation on the mixture obtained in step (1) to obtain a doctor solution and a desulfurizer material, cooling the liquid-phase to be 0 to 30 DEG C, preferably, 10 to 25 DEG C, recycling elemental sulfur, and drying the desulfurizer material to obtain a regenerative desulfurizer, wherein the doctor solution can be recycled. The regeneration method has the advantages that the sulfur capacity of the regenerative desulfurizer is high; the purity of recycled brimstone is relatively high; the operation is simple; the cost is low.

The invention discloses impurity-free Preyssler type heteropolyacid and a preparation method thereof, and belongs to the field of heteropolyacid preparation. The preparation method of the Preyssler type heteropolyacid comprises the following steps: adding phosphoric acid into an aqueous solution of sodium tungstate, and then reacting in a reaction kettle at 100-140 DEG C for 12-24 hours, wherein the molar ratio of phosphoric acid to sodium tungstate being (4-10): 1; after cooling to room temperature, adding ammonium chloride for suction filtration; washing with a methanol solution and recrystallizing; adding a small amount of sorbic acid and carrying out ion exchange on the heteropolyacid solution; and finally, carrying out vacuum drying on eluent. According to the impurity-free Preysslertype heteropolyacid preparation method, no potassium ions are added, meanwhile, the potassium acetate washing step is omitted, introduction of potassium ions into the product is avoided, the yield andpurity of the heteropolyacid finished product are improved, and the preparation method is simple in process, convenient to operate and suitable for industrial large-scale production and use.

The invention discloses a coal tar hydrogenation catalyst and a preparation method thereof. The preparation method comprises the following contents: firstly preparing high-silicon pseudo-boehmite, and then mixing the obtained high-silicon pseudo-boehmite with an auxiliary agent The carrier is obtained after molding, drying and calcining, and finally the active metal components are introduced into the obtained carrier, and the catalyst is obtained after further drying and calcining. In the preparation method of the coal tar hydrogenation catalyst of the present invention, high-silicon pseudo-boehmite is used as a raw material in the preparation process, and an auxiliary agent is added in the preparation of the carrier at the same time, and enters into the alumina structure to form a water-resistant component, and then Improve the water resistance of the catalyst, and prepare a coal tar hydrogenation catalyst with good wear resistance and hydrogenation performance.

The present invention relates to a method for preparing ascorbic acid aliphatic ester, and said method includes the following steps: preparing a mixture containing 95-100 wt% of sulfuric acid, ascorbic acid and aliphatic acid, making the described mixture produce reaction to obtain the reaction produce mixture containing ascorbic acid aliphatic ester, and separating out ascorbic acid aliphatic ester from it, the mole ratio of ascorbic acid and aliphatic acid is 1 to less than 1.25, and the weight ratio of sulfuric acid and ascorbic acid is at least 6. The reaction mixture is mixed with ice whose volume dose is 2-10 times that of sulfuric acid and / or water whose temp. is below 5 deg.C, then mixed with an aromatic hydrocarbon solvent, and said mixture is hented, and cooled to obtain an organic phase, said organic phase is filtered and dried so as to obtain a solid, i.e. the invented product.

The invention discloses an exclusion chromatography detection new method of an immune complex. A double antigen or double antibody sandwich method is used to carry out detection. The method comprisesthe following steps of 1) selecting carrier particles, coating detection antigens / antibodies on a surface of the carrier particles, and marking the paired antigens / antibodies with markers; 2) simultaneously adding the carrier particles coated with the detection antigens / antibodies, the antigens / antibodies with the markers, and a sample to be tested to a reaction container; 3) incubating and centrifuging; and 4) detecting through a detector. Compared with traditional ELISA and CLIA, in the exclusion chromatography detection new method of the immune complex, a washing step is omitted, operationis simple and detection time is shortened. The antigens and antibodies belong to a same phase reaction in a microcolumn cavity, the reaction is sufficient so as to avoid a disadvantage of an insufficient ELISA heterogeneous reaction. Compared with MGIA, fluorescence and other immunolabeling verification is performed, a signal is amplified, sensitivity is greatly increased and an application rangeis wide.

The invention discloses a preparation method of a mounting medium capable of simultaneously marking a cell nucleus. The preparation method comprises the following steps: 1) preparing 1 mol / L of TrizmaBase; 2) preparing 1 mol / L of NaH2PO4.2H2O; 3) preparing a Tris-phosphate buffer; 4) preparing glycerinum with the concentration of 50%; and 5) preparing the mounting medium. According to the prepared mounting medium capable of simultaneously marking the cell nucleus, the steps of dyeing and washing are omitted, the experiment flow is effectively simplified, the time cost is reduced, and the working efficiency is improved. The mounting medium can be used to mark and mount the cell nucleuses of samples like a frozen section, a paraffin section, a cell coverslip and a blood smear. The mountingmedium not only can be used to observe through a fluorescence microscope, but also can be used to observe through a laser scanning confocal microscope.

The invention discloses a method for extracting total DNAs of soil microorganisms at high purity. CTAB (Cetyltrimethyl Ammonium Bromide), lysozyme, protease and SDS (Sodium Dodecyl Sulfonate) act together to perform lysis of cells and simultaneously freeze and thaw the cells repeatedly; therefore, an excellent cell lysis effect is achieved; the humic acid is removed by utilizing PVP (Polyvinyl Pyrrolidone), CaC12 and BSA (Bull Serum Albumin); and the DNAs are precipitated by utilizing isopropanol so that the purity of the obtained DNAs is high. The method is simple and convenient; and without being purified, the DNAs obtained by the method can be used for subsequent PCR (Polymerase Chain Reaction) analysis and DGGE (Denaturing Gradient Gel Electrophoresis) analysis. The purity of the extracted DNAs meets the requirement for directly performing subsequent molecular biological research; the extracted DNA segments can be subjected to 16SrDNA amplification and DGGE atlas analysis; glue cutting recovery and basic group sequencing can be performed on specific stripes of the DGGE band; unknown bacteria can be identified through comparison with the conventional sequences in an RDP (Ribosomal Database Project) database or by establishing a new sequence probe; and therefore, the structural composition of the microbial community can be determined, and a foundation can be laid for researching the structural diversity and ecological functions of the soil microorganisms in the rhizosphere of the mulberry in future.

The invention discloses a coal tar hydrogenation catalyst and a preparation method thereof. The preparation method comprises the following steps: firstly preparing high-silicon pseudo-boehmite, then mixing the obtained high-silicon pseudo-boehmite with an auxiliary agent, molding, drying and roasting to obtain a carrier, finally introducing an active metal component onto the obtained carrier, and further drying and roasting to obtain the catalyst. According to the preparation method of the coal tar hydrogenation catalyst, the high-silicon pseudo-boehmite is adopted as a raw material in the preparation process, and the auxiliary agent is added in the carrier preparation process and enters an aluminum oxide structure to form a water-resistant component, so that the water resistance of the catalyst is improved, and the coal tar hydrogenation catalyst with good wear resistance and hydrogenation performance is prepared.

The invention discloses a synthesis method of an HZSM-5 molecular sieve adopting a dual template agent. The synthesis method comprises the steps that a silicon source, an aluminum source, a template agent, seed crystal and water are mixed in proportion and uniformly stirred to form gel; the gel is dried and ground into powder; the powder is crystallized in a reaction kettle containing water at the bottom; and a crystallized product is dried and calcined to obtain the product. The method does not use a raw material containing sodium ions, saves traditional ammonium exchange, washing and calcination processes, avoids separation of the product and mother liquid in the traditional crystallization technology, does not use expensive organic amine as the template agent, and has the characteristics of low cost, small waste liquid quantity, high yield and the like.

The invention relates to a preparation method with a simple process for a lithium ion battery positive electrode composite material. The preparation method comprises the following steps of (1) placingarbitrary two or three of salt solid raw materials of nickel, cobalt and manganese with crystallization water in a reactor, and performing heating to a melting state; (2) introducing ammonia gas under protection of inert gas, pressurizing to 1.2-1.4MPa, appropriately supplementing a few amount of water or not adding water according to solubility of the salts under different temperatures, and performing stirring and reaction; (3) evaporating an ammonium salt after reaction is completed, taking out a solid, and drying the solid to obtain an amorphous binary or ternary positive electrode composite material precursor; and (4) mixing the precursor and lithium carbonate according to a certain proportion, wherein the lithium ion battery positive electrode composite material can be prepared by atwo-segment sintering method. The positive electrode composite material prepared from the precursor is excellent in performance, and industrialization is facilitated.