8results about How to "Efficient oxidation" patented technology

The invention discloses a platinum-iron-molybdenum catalyst with high activity and stability as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalysis. The preparation method comprises the following steps: dissolving ferric nitrate, ammonium molybdate and citric acid in water, mixing, and adjusting the pH value to be less than 1.0; carrying out water bath gelation on the solution, drying, and calcining in a tubular furnace to obtain an iron molybdate carrier; mixing a platinum source with the iron molybdate carrier, drying by distillation in an oil bath, and calcining in a muffle furnace after drying to obtain the platinum-iron-molybdenum catalyst. The platinum-iron-molybdenum catalyst prepared by the preparation method disclosed by the invention can show efficient catalytic activity and excellent stability in propane oxidation reaction no matter whether the platinum cluster prepared in advance or the precursor salt of direct wet impregnation platinum is loaded.

The invention relates to the technical field of chemical products, and particularly discloses a preparation method of electronic-grade nitric acid. According to the method, the purified and concentrated nitric acid is filtered by using the nano modified PTFE membrane of which the surface is attached with the nano adsorbent and the interior is loaded with the diisooctyl phosphate. By improving the PTFE membrane, the operation of removing the metal ions in the method can be quickly and efficiently completed, the limitation of the removal efficiency of the metal ions on the yield of the electronic-grade nitric acid is effectively overcome, and the production efficiency of the electronic-grade nitric acid is fully improved.

The invention relates to the technical field of automobile exhaust purification and discloses a catalytic oxidation catalyst as well as a preparation method and application thereof. The invention relates to a catalytic oxidation catalyst, which comprises a carrier, a first coating and a second coating, the carrier is a regular structure carrier; the first coating comprises first cerium-zirconium composite oxide and / or first modified aluminum oxide and first precious metal, and the first precious metal is Pd and / or Pt; the second coating comprises at least one of a transition metal oxide, a second cerium-zirconium composite oxide and a second modified alumina, and a second noble metal, the second noble metal is Pd or Pt, the total amount of the first noble metal and the second noble metal is not higher than 20g / cft by element on the basis of the total amount of the catalyst, and the catalyst does not contain a molecular sieve. According to the catalyst, coating distribution is optimized based on reaction chemical characteristics in the tail gas treatment process, the effect of reducing the total content of precious metal is achieved, and wide application prospects are achieved.

The invention relates to the field of hair dyes, in particular to a hydrogen peroxide mixed solution for a hair dye and a preparation method thereof.The hydrogen peroxide mixed solution is prepared from, by mass, 68-70 parts of an aqueous phase solution, 0.4-0.5 part of a gel matrix, 24-26 parts of self-made shampoo and 5-6 parts of a hydrogen peroxide aqueous solution; according to the invention, the aqueous phase solution composed of specific buffering and curing components, the gel matrix with thickening and stabilizing effects, the mild self-made shampoo carrier and the core oxidant are precisely compounded, so that the obtained mixed solution can maintain efficient oxidation performance, and at the same time, the storage stability and the mildness during use are obviously improved; according to the present invention, with the application of the composition, the thixotropy and the smearing experience of the paste are effectively improved, the process reproducibility is good, the product quality is uniform, the organic combination of the oxidation function and the hair care function is achieved, and the composition is suitable for various oxidation type hair dyes, and has wide application prospects in home and professional hair dyeing markets.

This invention discloses a modular, controllable atmosphere high-temperature oxidation device for the recovery of substandard sponge zirconium, relating to the fields of nuclear fuel cycle and materials technology. The device includes: a furnace body system, comprising, from the outside to the inside, a steel outer shell, a refractory insulation layer, and a detachable furnace liner; multiple independently controlled heating zones arranged along the furnace body axis, each equipped with an independent heating element and thermocouple; an atmosphere control system including nitrogen and oxygen sources, an inert gas source, a mass flow controller, and a mixer; a sealing and cooling system employing a high-temperature sealing ring and a double-layer furnace shell design, with circulating cooling water flowing through the interlayer; and an automatic control system equipped with a temperature-atmosphere-time automated control program for fully automated operation and remote monitoring of the oxidation process. The device provided by this invention can achieve efficient and uniform oxidation treatment of irregular porous sponge zirconium within the range of 500-1000℃, transforming it into zirconium oxide with consistent physical properties.

The invention discloses a preparation method of a PD-L1 remodeling probe, and belongs to the technical field of probe preparation. Dissolving galactose oxidase containing free sulfydryl in a phosphate buffer solution; the preparation method comprises the following steps: adding NHS-polyethylene glycol 1000-maleimide into galactose oxidase, and mildly stirring at room temperature to obtain a mixed solution; transferring the mixed solution into a dialysis membrane, and dialyzing with a phosphate buffer solution for 12-16 hours; after dialysis is completed, adding a peptide fragment, reacting at room temperature to promote the reaction of NHS ester and amino of the peptide fragment, and finally generating a peptide-polyethylene glycol 1000-galactose oxidase covalent complex; the covalent complex is analyzed through lauryl sodium sulfate-polyacrylamide gel electrophoresis, if the molecular weight of a band is increased and migration occurs, the complex is successfully coupled, and the PD-L1 remodeling probe is obtained. The PD-L1 remodeling probe prepared by the invention can be used for specifically and efficiently oxidizing galactose / N-acetylgalactosamine residues at the tail end of PD-L1 to generate aldehyde groups so as to be subjected to biological orthogonal reaction with hydrazide groups.

The present application belongs to the field of catalysts, and particularly relates to a perovskite catalyst and a preparation method thereof. The preparation method comprises the following steps: (1) adding metal ions into a deionized water solution of a chelating agent; the metal ions are a mixture of lanthanum metal ions and transition metal ions; then adding citric acid and stirring until a clear solution is obtained; (2) gradually adding an ammonia water solution into the mixed solution prepared in step (1) to adjust the pH value; (3) evaporating water from the mixed solution obtained in step (2) and then performing high-temperature calcination to obtain the perovskite catalyst. The present application provides a catalyst capable of oxidizing soot (carbon smoke) in exhaust gas at a lower temperature within the exhaust gas temperature range of a diesel engine. Mainly by regulating the type and content of the complexing agent, NO is converted into adsorbed NO2, thereby efficiently oxidizing carbon smoke.

The invention provides a potassium permanganate loaded attapulgite / silicon dioxide aerogel gas scavenger and a preparation method, and relates to the field of food preservation, the potassium permanganate loaded attapulgite / silicon dioxide aerogel gas scavenger comprises an inorganic porous composite carrier and KMnO4 loaded on the inorganic porous composite carrier; the porous inorganic composite carrier is ATP / SiO2 aerogel formed by attapulgite ATP and SiO2, and is specifically obtained by adsorbing a KMnO4 solution by ATP modified SiO2 aerogel and drying; the technical obstacle that the SiO2 aerogel and the KMnO4 cannot be directly combined due to the fact that the SiO2 aerogel is easy to reduce the KMnO4 is overcome, the reducibility of the aerogel is eliminated, the structural stability of the material is enhanced, the formability and the thermal stability of the material are guaranteed, and the KMnO4 loading capacity of the material is greatly improved.