12results about How to "Increase catalytic rate" patented technology

The invention relates to the technical field of contact lens care and catalysis, in particular to a platinum alloy neutralization ring for a hydrogen peroxide care solution and a preparation method of the platinum alloy neutralization ring. The problems that in the prior art, a platinum alloy is poor in neutralization ring cycle catalytic performance and insufficient in antibacterial and bactericidal performance are solved. The preparation method comprises the following steps: adding an organic solvent and a silver nitrate solution to carry out swelling treatment, surface silver ion plating and reduction on a plastic substrate to obtain a silver-plated substrate, complexing a metal complexing agent and platinum salt, and activating by sodium nitrite to form a platinum nano layer on the surface of the silver-plated substrate to obtain a platinum alloy neutralization ring; the type of the metal complexing agent is adjusted to improve the stability of the plating solution A; the chemical plating temperature and time are controlled, and the catalytic rate of a neutralization ring is increased; the dosage composition ratio of the metal complexing agent is controlled, and the catalytic ability of the neutralizing ring is improved; the cyclic catalytic performance of the neutralization ring is improved by changing the dosage of the organic solvent; the use amount of each component of the organic solvent and the use amount of silver nitrate are adjusted, so that the antibacterial property of the platinum neutralizing ring is improved.

The invention relates to the technical field of electro-catalysis, in particular to transition metal phosphorus sulfide and a preparation method and application thereof. The invention provides a preparation method of transition metal phosphorus sulfide, which comprises the following steps: mixing transition metal, phosphorus and sulfur to obtain a mixture; and carrying out vacuum sintering on the mixture to obtain the transition metal phosphorus sulfide. According to the preparation method, the transition metal phosphorus sulfide is successfully prepared, the transition metal phosphorus sulfide has excellent urea electro-catalysis performance, and more efficient electro-catalysis urea oxidation can be achieved to assist water electrolysis for hydrogen production.

The invention relates to a preparation method of a covalent organic framework based on amido bond bridging, which comprises the following steps: taking melamine and aromatic multi-acyl chloride as raw materials, and carrying out sol-gel reaction, aging, solvent exchange and freeze drying to obtain the covalent organic framework based on amido bond bridging, the aromatic multi-element acyl chloride is trimesoyl chloride or terephthaloyl chloride. The covalent organic framework photocatalyst bridged by crystalline amido bonds and having a layered structure is prepared by taking melamine and aromatic polyacyl chloride as raw materials through sol-gel reaction and other processes, and the covalent organic framework photocatalyst has relatively high photocatalytic activity and can directly decompose water to produce oxygen under the condition of visible light.

This invention relates to the field of wastewater treatment technology, specifically to a metal-doped bismuth ferrite-based perovskite composite material, its preparation method, and its applications. The molecular formula of the metal-doped bismuth ferrite-based perovskite composite material is Bi. 1‑x A x Fe 1‑y B y O3; 0 ≤ x < 1, 0

The invention provides a reactor comprising a reaction chamber having a catalytic surface in contact with reactants in said chamber; and a source for passing electrical current through said catalytic surface. The reactor can be used for dehydrohalogentation reactions, such as dehydrochlorination of HCFC-244bb to HFO-1234yf, and for reactions where zero valent metals are employed for catalysis. The invention further provides a process to prepare HFO-1234yf from HCFC-244bb using an electrically heated reaction chamber.

The invention discloses a mesoporous hollow carbon drug loading system with cascade enzyme catalytic activity and preparation and application thereof, and belongs to the technical field of medicines. The drug loading system is composed of mesoporous hollow carbon, an anti-tumor drug, gold nano-enzyme and a hydrophilic functional polymer. The preparation method comprises the following steps: preparing gold nano-enzyme; the preparation method comprises the following steps: preparing MHC-COOH and MHC-SH; and preparing the drug-loaded nano enzyme. The drug loading system provided by the invention realizes efficient loading and stable dispersion of chemotherapeutic drugs. The gold nano-enzyme with the size consistent with that of the mesoporous channel of the carrier is used as a'gated 'switch and has multiple functions. The drug loading system has the effect of enhancing PTT; the premature release of chemotherapeutic drugs is prevented, the toxic and side effects on normal tissues are reduced, and the reduction / pH / NIR multi-responsive drug release behavior is realized; under the irradiation of near-infrared light, the drug release speed is further accelerated, the GSH consumption rate and the catalytic rates of the gold nano-enzyme and MHC are further improved, and a nano delivery system for enhancing chemotherapy through photo-thermal and cascade enzyme catalysis is achieved.

The invention belongs to the technical field of catalysts, and discloses a Co-B catalyst and a preparation method and application thereof. The cobalt boride catalyst is prepared by adopting a chemical reduction method, and the method comprises the following steps: dissolving a cobalt compound in water or ethylene glycol or a mixed solution consisting of water and ethylene glycol, and heating to a certain temperature to obtain a solution A; dissolving NaBH4 and NaOH in water or ethylene glycol or a mixed solution composed of water and ethylene glycol to obtain a solution B; under the stirring condition, dropwise adding the solution B into the solution A for reaction, and centrifuging, washing, drying and passivating the obtained product to obtain the Co-B catalyst. The preparation method is simple and convenient, the Co-B catalyst for catalyzing hydrolysis of NaBH4 to produce hydrogen is synthesized through a one-step chemical reduction method, the catalyst has a large pore diameter and a large specific surface area and shows good catalytic efficiency, and the release rate of catalyzing hydrolysis of NaBH4 at 45 DEG C is 2659.8 mL min <-1 > g <-1 >.

The invention discloses a mutant double-enzyme catalyst, application and an (S)-vitrin synthesis method, and relates to the technical field of bioengineering.Methylglyoxal reductase GRE2 (A) of candida glabrata and phosphite dehydrogenase PTDH of methylotrophicus are used as sources for modification, mutants of the candida glabrata and the phosphite dehydrogenase PTDH are screened, and the mutant double-enzyme catalyst is obtained. The key residues influencing the enzymatic properties of the initial methylglyoxal reductase and the phosphite dehydrogenase are determined, and the methylglyoxal reductase mutant and the phosphite dehydrogenase mutant with high activity are obtained at the same time. The two mutants with the highest utilization efficiency have a good catalytic effect in a reaction for catalyzing beta-acetone xyloside to prepare (S)-bose in a 22T reaction system, the overall catalytic efficiency is improved by about 43%, and the cost is reduced by about 8%.

The invention discloses a preparation method of a zinc modified mesoporous Y type molecular sieve. The preparation method comprises the following steps: preparing a mesoporous NaY type molecular sieve by taking a Bola type surfactant [C5H5-N < + >-(CH2) 10-O-(p-C6H4) 2-O-(CH2) 10-N < + >-C5H5]. 2 [Br <->] as a template agent and matching with a specific raw material proportion; the NaY type molecular sieve is sequentially soaked in an ammonium salt solution and a zinc salt solution for ion exchange, and after drying and calcination, the zinc modified mesoporous Y type molecular sieve is obtained. The zinc-modified mesoporous Y-type molecular sieve prepared by the invention has larger specific surface area, higher pore volume and excellent conductivity, the detection range of the zinc-modified mesoporous Y-type molecular sieve applied to an electrochemical sensor for detecting the content of acetaminophen is 0.066-10000 [mu] mol / L, the detection limit can reach 0.01 [mu] mol / L, meanwhile, the zinc-modified mesoporous Y-type molecular sieve has excellent detection sensitivity, stability, reproducibility and selectivity, and the application prospect is wide. Accurate determination of acetaminophen in drugs can be achieved, and the prepared electrochemical sensor is simple in structure, convenient to operate and low in detection cost and has wide application prospects.

The invention discloses an LCCICCG mutant protein and application thereof. The LCCICCG mutant protein is prepared by carrying out any one mutation of a, b and c or combined mutation of two or three of a, b and c on an LCCICCG protein amino acid sequence shown as SEQ ID NO: 1: a, carrying out combined mutation on any two of 208th, 238th and 283th amino acid residues; b, performing combined mutation on the 218th and 222th amino acid residues; and c, mutating one or more of the 278th, 239th, 68th and 158th amino acid residues. The mutant protein with improved thermal stability and / or catalytic activity is obtained by performing mutation modification on LCCICCG, the affinity and catalytic rate of the obtained mutant protein M3 to a PET substrate are obviously improved, and the hydrolytic activity of the mutant protein M3 to Gf-PET and PCW-PET is obviously higher than that of the LCCICCG.

The invention discloses a Ni3S2 / VN-C / C bifunctional electro-catalytic material and a preparation method and application thereof.The preparation method comprises the steps that a nickel source, a vanadium source and thioacetamide are taken according to the proportion and mixed to be uniform, then the mixture is added into ethyl alcohol and stirred to be dissolved, a mixed solution is obtained, the mixed solution is transferred into a polytetrafluoroethylene lining of a high-pressure reaction kettle, and the Ni3S2 / VN-C / C bifunctional electro-catalytic material is obtained; the preparation method comprises the following steps: putting Ni3S2 into a high-pressure autoclave, putting the high-pressure autoclave into a pretreated C / C composite material, sealing well, finally putting the high-pressure autoclave into an electric forced air drying oven, setting the temperature parameter to be 100-170 DEG C and the heat preservation time to be 10-16 hours, and carrying out solvothermal reaction to obtain V-Ni3S2-C / C; v-Ni3S2-C / C is placed in a porcelain boat, a small porcelain boat is placed at one end of a large porcelain boat, a nitrogen source is placed at the other end of the large porcelain boat, it is guaranteed that the molar ratio of a V source to the nitrogen source is 1: (4-6), the nitrogen source is placed at the gas inlet end, a tubular furnace is used for calcination for 1-4 h in the argon atmosphere, the calcination temperature is 700-1200 DEG C, and the Ni / Ni3S2 / VN-C / C bifunctional electro-catalysis material is obtained. The material is good in appearance, good in electro-catalytic performance and stable for a long time in a strong alkali environment, the preparation method is simple, and the morphology of the product is controllable.

The invention provides a reactor comprising a reaction chamber having a catalytic surface in contact with reactants in said chamber; and a source for passing electrical current through said catalytic surface. The reactor can be used for dehydrohalogentation reactions, such as dehydrochlorination of HCFC-244bb to HFO-1234yf, and for reactions where zero valent metals are employed for catalysis. The invention further provides a process to prepare HFO-1234yf from HCFC-244bb using an electrically heated reaction chamber.