139results about How to "Activity unchanged" patented technology

The invention discloses a high stability catalyst used for oxidizing nano-Au by CO at room temperature and a preparation method thereof. The catalytic active component of the catalyst is Au or alloy formed by Au and noble metal Rh (or Pt). The carrier is TiO2 or TiO2 modified by rare earth, wherein, the rare earth is one or more than one of Ce, La, Ho, Dy and Tm. The preparation of the catalyst is divided into two steps: the sol-gel method is adopted to prepare TiO2 and carrier material of TiO2(Re-TiO2) modified by rare earth; then Re-TiO2 is taken as the carrier, the deposition-precipitation method is adopted to prepare a Au-Rh(or Pt)/Re-TiO2 catalyst. The catalyst of the invention has very high stability and can catalyze CO to lead to the complete conversion at room temperature. The activity of the catalyst remains the same after the catalyst is used for 1,000 hours.

The invention relates to a production method of instant dried white fungus. The production method comprises the following steps: (1) material selection, namely removing impurities from fresh white fungus, and cleaning; (2) slicing; (3) pre-freezing, namely carrying out pre-freezing for 12-14 hours at temperature from -10 DEG C to -25 DEG C; (4) drying, namely carrying out microwave vacuum freeze drying, wherein the microwave vacuum freeze drying comprises a low-temperature sublimation stage and a normal-temperature vacuum microwave drying stage; (5) vacuum encapsulation. According to the process, a curing process before drying is omitted, so that the loss of the tremella polysaccharide is avoided, and processing cost is saved by 15%. According to the instant dried white fungus processed by utilizing the production method, the product is pure in appearance and color and plump in form; after being rehydrated, the product is nature in form and pure in taste and flavor, the product quality is greatly improved, and the product is obviously superior to similar products processed by utilizing traditional methods.

The invention relates to a glycol ether preparation method, mainly solving the problems of the original technique that the target product, glycol ether, has low selectivity, high alcohol/ epoxy ethane ratio (alcohol/ alkyl ratio) and no concern on catalyst stability. The invention uses epoxy ethane and lower fatty alcohol as raw materials, adopts niobium oxide as a main activated component, and chooses at least one of elements or compounds of V, Mo, Sn, Pb, La, Pr, Nd as auxiliary agent to form catalyst, so as to prepare glycol ether under the reaction temperature of 100 to 300 DEG C, reaction pressure of 0.1 to 3.0MPa, alcohol/ alkyl ratio of 1-5: 1, and reaction time of 30 minutes to 8.0 hours. The technical proposal can well solve the problem and can be used for the industrial production of the glycol ether.

The invention relates to a DNA fluorescent probe and a preparation method thereof. The DNA fluorescent probe is characterized in that semiconductor light emitting nanoparticles CdTe/CdS/ZnS are used as a fluorescence emitting energy feeder, gold nanoparticles are used as a fluorescence absorbing energy receptor, and the CdTe/CdS/ZnS nanoparticles are connected with single-chain NH2-DNA, thus forming CdTe/CdS/ZnS-DNA; the gold nanoparticles are connected with single-chain SH-DNA, thus forming Au-DNA; the single-chain SH-DNA and the NH2-DNA are complementary to each other, and the DNA fluorescent probe is formed by hybridization of the CdTe/CdS/ZnS-DNA and Au-DNA. The preparation method of the DNA fluorescent probe firstly prepares the semiconductor light emitting nanoparticles CdTe/CdS/ZnS and the CdTe/CdS/ZnS-DNA, prepares the gold nanoparticles and the Au-DNA nanoparticles, connects the CdTe/CdS/ZnS-DNA (energy feeder) and the Au-DNA (energy receptor), and finally prepares the DNA fluorescent probe.

The invention relates to a grafted solid acid catalyst. A preparation method of the grafted solid acid catalyst comprises the following steps: taking lignocelluloses biomass carbon-based material as a raw material, taking a sulfonating agent as an active molecule, and carrying out carbonization reaction for 1-36 hours at the temperature of 120-240 DEG C, wherein the mass ratio of the raw material and the sulfonating agent is 1/10-10; standing black solid obtained by carbonization at high temperature, drying to obtain black solid which is a rough carbon-based solid acid catalyst; and mixing the rough carbon-based solid acid catalyst with an oxidizing agent according to the solid-liquid ratio of 1/10-0-1/10, reacting for 0.5-3 hours at the temperature of 50-60 DEG C, after reaction, filtering and separating to obtain black solid, and washing and drying the black solid to obtain the grafted carbon-based solid acid catalyst. Cellulose-based glucose is used as the raw material of the catalyst, the structural characteristics of the raw material are similar to the structural characteristics of the raw material of lignocelluloses biomass, therefore, catalyzing effect is excellent, and the catalyzing effect of the grafted solid acid catalyst is similar to the catalyzing effect of liquid acid.

The present invention relates to a catalyst for preparing dimethyl ether by using methyl alcohol dehydration. Said catalyst is made up by using niobium oxide as main active component and selecting at least one kind of phosphorus or sulfur as adjuvant through a certain preparation process. Said catalyst not only has good activity, but also possesses good stability.

The invention discloses a method for preparing tributyl citrate by taking macroporous strong-acid cation exchange resin as a catalyst, belonging to a preparation method of tributyl citrate. The method comprises the steps of: reacting citric acid with n-butanol in the presence of macroporous strong-acid cation exchange resin (NKC-9) serving as a catalyst; filtering to remove the catalyst after the reaction reaches the end point; and neutralizing, rinsing, distilling and purifying the product to obtain the tributyl citrate. The separated catalyst can be recycled, and the activity is basically unchanged. By taking the reactant n-butanol as a water-carrying agent, the environmental pollution due to the use of organic solvents such as toxic benzene, methylbenzene and the like can be avoided, and the aftertreatment is convenient; the method has the advantages of mild reaction conditions, short reaction time, no environment pollution and the like.

The invention discloses a method for preparing cyclohexanol and cyclohexanone through cyclohexane oxidation catalyzed by molecular oxygen. The invention uses the cyclohexane as a reactant, the oxygen as an oxidant and nanoferrite as a catalyst, and any organic solvent or additive are not added during the reaction process. After the reaction, the separation of the catalyst and the product can be realized through simple filtration, the catalyst can be recycled without any loss of the catalytic activity, the conversion rate is over 12%, and the selectivity of the cyclohexanol and cyclohexanone is over 92%.

The invention belongs to the field of environmental pollution treatment and particularly relates to a method for quickly removing refractory organic matter in wastewater through activation of persulfate by hollow cobalt-rich bimetallic sulfide. MOF formed by dimethylimidazole and bimetallic nitrate is adopted as a precursor, then, the bimetallic sulfide is prepared through a solvothermal vulcanization reaction, and finally, a stable hollow crystal structure is formed through calcination. Under the wide pH condition, the prepared hollow cobalt-rich bimetallic sulfide is added to wastewater containing the refractory organic matter and can activate persulfate to quickly produce free sulfate radicals, and the refractory organic matter can be efficiently removed within 10 min. Compared with theprior art, the method has the advantages that the hollow cobalt-rich bimetallic sulfide is convenient to prepare, stable in structure, low in dosage, high in efficiency and applicable to wide pH ranges and has superior economic and technological advantages.

The invention discloses a [2.2] paracyclophane derivative as shown in the general formula (A), wherein R is phenyl or 2,4,6-trimethylphenyl, and the two R groups in the general formula (A) are same. The invention also discloses a preparation method of the compound and an application of the compound as a nonmetallic catalyst to the catalytic hydrogenation reduction reaction of imide compounds. The [2.2] paracyclophane derivative as shown in the general formula (A) is novel in structure, is mild in reaction condition and high in reaction yield in the preparation process and has the characteristics of high catalytic activity, recycling and no heavy metal residues in products when being used for the catalytic hydrogenation reduction reaction of the imide compounds so as to have wider application prospect and higher societal and economic benefits.

The invention discloses a method for catalytically synthesizing aminated compounds by using carbon-silicon solid acid as catalysts. In the method, alpha, beta-unsaturated ester and amine are used as raw materials, the carbon-silicon solid acid is used as the catalysts, the catalysts use furfuryl alcohol as carbon sources and use fuming sulphuric acid as sulfonating reagents, and sulfonic groups are introduced on amorphous carbon generated after the carbonization of the furfuryl alcohol. The conversion rate of reactants of the invention is higher than 97.0 percent, the product selectivity is higher than 97.3 percent, the operation is simple, the reaction time is short, no solvent is needed, the catalysts recovered after the completion of the reaction can be reused, and the activity maintains unchanged.

The invention discloses separation and application of a high-lysis-rate salmonella phage RDP-SA-17118. The host of the salmonella phage RDP-SA-17118 is salmonella S6, and the phage can form a plaque with a diameter of 2mm-4mm on double plates. Through observation by an electron microscope, the phage has a polyhedral stereosymmetric head which wraps nucleic acid and has a diameter of 70nm; the phage has a tail with a length of 120nm and has a tail sheath; a neck is connected with the head and the tail; and the phage belongs to myoviridae of caudovirales. The phage has a high titer of 10<12> pfu/mL and has good tolerance to temperature and pH value, and the titer still keeps 10<12>pfu/mL or above after continuous passage for 29 times. The phage has a good lysis effect on a host after being diluted by 10<6> times, and after the phage is fed, existence of the phage can be detected in heart, liver, lung, kidney, thymus and serum. Through animal experiments, the phage has a good effect in treating chicken salmonella diseases.

The invention discloses a kit for detecting Zika virus, dengue virus and chikungunya virus. The invention discloses a primer and probe combination, and the primer and probe combination includes a primer and probe group I, a primer and probe group II and a primer and probe group III; the primer and probe group I is composed of a primer ZIKV-F, a primer ZIKV-R and a probe ZIKV-P; the primer and probe group II is composed of a primer DENV-F, a primer DENV-R1, a primer DENV-R2 and a probe DENV-P; the primer and probe group III is composed of a primer CHIKV-F, a primer CHIKV-R and a probe CHIKV-P; and the primer ZIKV-F, the primer ZIKV-R, the probe ZIKV-P, the primer DENV-F, the primer DENV-R1, the primer DENV-R2, the probe DENV-P, the primer CHIKV-F, the primer CHIKV-R and the probe CHIKV-P are sequentially shown as sequences 1-10. The kit provided by the invention has a great value for detection of the Zika virus, the dengue virus and the chikungunya virus and for prevention and control of related diseases.

The invention provides a method for storing seeds of southernwood, which is characterized in that the seeds of the southernwood are refrigerated under a temperature below 5 DEG C. The method of the invention effectivly prolongs the service life of the seeds of southernwood, and a higher germination percentage of the seeds of the southernwood are maintained. The method ensures a high activity and germination percentage of seeds after being stored for 24 months; but seeds stored at ambient temperature for 24 months loss activities completely, and the germination percentage is 0.

The invention discloses a method and system for preparing syngas from biomass through microwave pyrolysis. The method includes a microwave pyrolysis reaction process taking biomass as a raw material,a microwave gasification reaction process, and a catalyst recycling regeneration process. An adopted catalyst is a catalyst including ammoniated modified biomass semi-coke and a nickel oxide component. The catalyst recycling regeneration process includes an oxidation treatment process and an amination treatment process. The system of the present invention includes a feed assembly, a microwave pyrolysis assembly, a microwave gasification assembly, and a catalyst regeneration assembly. The catalyst regeneration assembly includes an oxidation processor and an ammoniation processor, and the ammoniation processor is connected to the microwave gasification assembly. The catalyst used in the method and system of the present invention is modified by ammoniating modification, and catalytic orientedgasification can increase the adsorption amount of acidic compositions on the surface of a basic catalyst, reduce the acidity of the system, suppress side reactions of coke, and increase the yield ofthe syngas. The system of the present invention can effectively couple and integrate products and energy during the production process and realize a continuous and streamlined process.

The invention relates to a catalyst for preparing propylene carbonate through the reaction of carbon dioxide and propylene oxide and the application thereof. The catalyst comprises a main catalyst ruthenium pyridine compound and an auxiliary catalyst quaternary. The molar ratio of the main catalyst to the auxiliary catalyst is 1:1 to 2, and the molar ratio of the main catalyst to the is 1:800 to 10000. The catalyst is used to catalyze the reaction of the carbon dioxide and the propylene oxide, so as to synthesize the propylene carbonate with high yield and high selectivity. The catalyst can be reused.

The invention relates to the regeneration method for a nickel hydrogenation catalyst, which is divided into two stages: aminolysis of the condensation polymer, with catalyst bed temperature being 120-180deg.C, ammonia pressure being 0. 1-0. 5MPa, dimension ratio of ammonia and the catalyst being 10-40, regenerated time being 1-2 hours, hydrogenation for aminolysis in the temperature of 150-280deg.C, hydrogen pressure 1. 0- 3. 0MPa, hydrogen and catalyst dimension ratio being 10-40, regeneration time being 2-10 hours. Its activeness can reach the level of fresh catalyst. Due to tempered regeneration conditions, it can extend the life of the catalyst significantly.

The invention discloses a solid base catalyst and is application in biodiesel synthesis. The catalyst is prepared from organic metal salt and aluminium oxide or diatomite by grinding and mixing at room temperature, and calcining at high temperature. The biodiesel is synthesized by ester exchange, by adding grease, low carbon alcohol and the solid base catalyst into a three-necked container to heat for refluxing under stirring, filtering to obtain catalyst, demixing the filtrate to obtain lower layer glycerol and upper layer mixture, adding NaHCO3 solution into the upper layer mixture, washing until a neutral condition, drying with anhydrous MgSO4, and vacuum distilling. The catalyst for biodiesel synthesis has the advantages of high yield, cheap price, small consumption amount, mild reaction condition, short reaction time, repeated use of the catalyst, no environmental pollution and low requirement for raw material.