30 results about "Alcohol reduction" patented technology

The invention provides a preparation method of a highly-dispersed precious metal electrocatalyst with high stability and a low load capacity. According to the preparation method, low content preciousmetals such as platinum, palladium, ruthenium, iridium, and the like, are taken as the catalytic active components; cheap metals such as iron, tin, cobalt, nickel, copper, and the like, are taken as sacrificial metals; alloy particles are synthesized through a hydrothermal method, an alcohol reduction method, or a hydrazine reduction method; then alloy particles are loaded on a heteroatom doped functionalized carbon carrier through the anchoring effect of the functionalized carbon carrier so as to obtain a catalyst precursor; then the catalyst precursor is soaked in an acid to dissolve the sacrificial metals, the alloy particles are cracked, the precious metals are left on the heteroatom doped functionalized carbon carrier, and the precious metal catalyst with a highly dispersed structureis obtained. The precious metal catalyst has an excellent catalytic performance, moreover, the loading amount of precious metals is greatly reduced, the utilization rate of precious metals is largelyincreased, the catalyst cost is effectively reduced, and the contradiction between the performance and cost is solved.

The invention discloses a preparation method of silver nanowires. The preparation method includes the following steps that the Ag nanowires are prepared through an improved polyhydric alcohol reduction method, put simply, polyvinylpyrrolidone is mixed with ethylene glycol, and an organic dispersant solution is obtained; the organic dispersant solution is added into a three-necked flask and heated and stirred for 5 min in a 160 DEG C oil bath pan; then, an ethylene glycol solution, of a certain concentration, of AgNO3 is dropwise added into the three-necked flask, and full stirring is performed; then, a NaCl solution of a certain concentration is dropwise added, co-heating is performed at 160 DEG C for a certain period of time, and full stirring is performed; and an obtained mixed solution is separated to obtain precipitate, and the precipitate is subjected to centrifugal washing three times with acetone and distilled water to obtain the silver nanowires. Compared with a traditional preparation method of the silver nanowires, the preparation method is simple in process and short in consumed time, does not need high temperature and lowers the requirement for equipment, and the silver nanowires uniform in size and high in purity are prepared.

The invention relates to the technical field of food, in particular to a method for removing turbidity of liquor base. The method for removing the turbidity of the liquor base comprises steps as follows: firstly, to-be-removed substances resulting in turbidity after liquor alcohol reduction are enriched through two-step distillation, and then the substances are removed through low-temperature filtering. According to the method, the removal rate of the substances resulting in the turbidity after liquor alcohol reduction can be up to 95%, main aroma matters in the base are not reduced obviously, and the sensory attributes of the base are not damaged. Besides, the base is directly taken as a raw material for removing the turbidity, compared with a finished liquor product as a target, the size is smaller, the operation is more convenient, and the cost is reduced.

The invention provides a method for preparing spherical cobalt powder. The method includes the following steps of mixing CoCL2.6H2O with polyhydric alcohols, adding alkali liquor, preparing mixed solutions with the cobalt concentration of 5-30g/L, heating for 196-198 DEG C, reflux carried out for 2-4 hours, suction filtration, washing, hydrogen drying and reduction under the temperature of 300-500 DEG C, and preparing the cobalt powder. According to the method, the cobalt salt CoCL2.6H2O is directly utilized to be reacted with the polyhydric alcohols to prepare the spherical cobalt powder, and consumed time is shortened by 40%-60% of the time of a traditional cobalt salt reduction method. According to the method, the polyhydric alcohols and the hydrogen drying and the reduction under a high temperature are adopted, not only is spherical appearance of the polyhydric alcohol reduction cobalt powder saved, but also purity of the cobalt powder is improved, under the condition that the cobalt concentration is up to 5-30g/L in an industrialized process, the prepared spherical cobalt powder has good appearance characteristics, the grain size of products can be controlled, and the cobalt conversion rate is up to more than 98%.

The invention relates to a method of constructing an electrochemical aptamer sensor with a TiO2 nanorod composite as an electrochemical tracer agent. The method comprises steps of: depositing Pt-Sn dual-metal nanoparticles on the surface of a cylindrical TiO2 nanorod uniformly through an alcohol reduction method and synthesizing a PtSn@TiO2 nano composite; dispersing the PtSn@TiO2 nano composite in a chitosan solution and then dripping the solution onto the surface of a GCE electrode, fixing NH2-cDNA on the surface of the modified electrode with BS<3> as a diamino crosslinker, and then fixingstreptomycin aptamer on the electrode through DNA hybridization of NH2-cDNA and the aptamer. When a mixture of streptomycin and exonuclease is introduced, the aptamer can combine with streptomycin specificity preferentially and separate from NH2-cDNA on the surface of the electrode so as to form a single-chain DNA structure. Exonuclease acting on the single-chain DNA alone digests and degrades single-chain NH2-cDNA, aptamer-streptomycin compound selectively, so as to enable the compound to release streptomycin, and released streptomycin can combine with remaining aptamer specificity on the surface of the electrode circularly. The electrochemical aptamer sensor can detect streptomycin rapidly and sensitively, and has a large linear range and low detection limit.

The invention provides a worm-hole-like mesoporous carbon carrier-loaded PtRu catalyst. WMCs of different pore diameters are synthesized through an improved sol-gel technology; by taking the WMCs as the carriers, a series of WMC-loaded PtRu catalysts are prepared by adopting a pulse microwave-assisting polyhydric alcohol reduction technology; and the physical and chemical properties and electro-catalytic property of the catalysts are subjected to system test and analysis. By researching the PtRu catalysts taking the WMCs of three different pore diameters as the carriers, influence of the porediameters of the carriers to the PtRu electro-catalysis methanol oxidation activity is found through searching. The researching finds that 1), the specific surface area is relatively large under the same appearance; and when carbon carriers of different pore diameters are adopted, the prepared catalyst PtRu granules are basically the same; and 2), the pore diameters of the carriers have a decisiveinfluence on the PtRu catalyst catalysis activity.

Spark ignition engine operation at higher RPM so as to reduce alcohol requirements in high efficiency alcohol enhanced gasoline engines is disclosed. Control of engine upspeeding (use of a higher ratio of engine RPM to wheel RPM) so as to achieve an alcohol reduction objective while limiting any decrease in efficiency is described. High RPM alcohol enhanced gasoline engine operation in plug-in series hybrid powertrains for heavy duty trucks and other vehicles is also described.

The invention relates to the technical field of semiconductors, in particular to a method for preparing a copper nano grid transparent electrode based on gas phase reduction of copper oxide. The method comprises the following steps: preparing a spinning precursor solution by using copper nitrate, preparing a copper nitrate composite nanowire through electrostatic spinning, and heating and oxidizing the prepared copper nitrate composite nanowire to obtain copper oxide nanofiber; finally, putting the obtained copper oxide nanofiber into an enclosed reaction kettle, wherein the enclosed reactionkettle contains gaseous alcohols, and then placing the reaction kettle at 200-250 DEG C for reaction for 3-5h to obtain a copper nano grid transparent electrode; the method for reducing the copper oxide nanofiber by the solvent gas phase not only keeps the appearance of the nanofiber, but also completely reduces the copper oxide; the problem that a nano grid transparent electrode is easy to breakin the prior alcohol reduction process is solved; the method has the advantages of safety, low cost and excellent reduction effect, ensures the transmittance and the conductivity, and finally obtainsthe copper grid transparent electrode with excellent performance.

The invention discloses single-phase Pd<x>Pt<(50-x)>Bi<50> ternary alloy nanoparticles with a close-packed hexagonal structure as well as a preparation method and application thereof, and belongs to the technical field of alloy materials and electrochemistry. The Pd<x>Pt<(50-x)>Bi<50> ternary alloy nanoparticles are prepared and synthesized through a polyhydric alcohol reduction method, the particles are of a single close-packed hexagonal structure, the molar ratio of the Pd component in the alloy is 2.5-15, and the size of the nanoparticles is 10-50 nm. The Pd<x>Pt<(50-x)>Bi<50> ternary alloy nanoparticles synthesized by the method have the advantages of low Pt content, no impurity phase, high ORR and HER activity and stability, and have potential value for realizing large-scale application of a technology with less platinum in the aspects of fuel cells and commercial electrolyzed water.

The invention relates to capsule gold nano particles with a double adsorbing property in a visible light region and a preparation method thereof. The capsule gold nano particles have the characteristics of being uniform in size, good in dispersibility and the like. The ratio of length to diameter of the nanoparticles can be effectively regulated within a range of 1: 1 to 5:2. The preparation method comprises the following steps: (1) preparing gold nanodecanedrons different in size in ethylene glycol by virtue of a polyhydric alcohol reduction method by taking poly diallyldimethylammonium chloride as a stabilizer and a morphological control agent; and (2) in a stirring condition, adding a certain amount of a gold decanedron nanoparticle colloidal solution into an ethylene glycol solution comprising poly diallyldimethylammonium chloride, chloroauric acid and ascorbic acid, and performing a reaction at a temperature of 0-100 DEG C for 30-180 minutes to obtain the capsule gold nanoparticle colloidal solution. The capsule gold nanoparticles obtained by the invention has a double adsorbing property in the visible light region, and has important application value and a wide application prospect in the aspects of solar utilization, photothermal conversion, biological/chemical sensing, medical diagnosis and the like.