9 results about "Potassium cyanate" patented technology

This invention relates to a method for preparing cobalt selenide rich in double defects and its application in the electrocatalytic reduction of oxygen to hydrogen peroxide. First, selenium powder is mixed with sodium hydroxide solution to obtain material A. Cobalt salt is mixed with EDTA-2Na solution to obtain material B. Material B and material A are then mixed and subjected to a hydrothermal reaction. The resulting product is centrifuged, washed, and vacuum dried to obtain cobalt selenide powder. The cobalt selenide powder is dispersed in anhydrous ethanol, and then potassium thiocyanate powder is added. After vigorous stirring, ultrasonic exfoliation is performed. The product is centrifuged, washed, dried, and calcined to obtain cobalt selenide rich in double defects. This invention provides a simple preparation method that can rapidly and cost-effectively prepare double-defect cobalt selenide under mild conditions. The obtained double-defect cobalt selenide can effectively reduce oxygen to hydrogen peroxide under electrocatalytic conditions, solving the problems of high price and low efficiency of current catalysts for hydrogen peroxide production under acidic conditions.

The application discloses a copper plating composition and a chemical copper plating process, and relates to the field of copper plating compositions, which is composed of the following components: a copper salt providing divalent copper ions; a complexing agent for complexing the divalent copper ions; a stabilizer for stabilizing the copper plating composition, which is selected from at least one of the group consisting of 2,2'-dipyridyl, potassium selenocyanate, potassium thiocyanate and 2-mercaptobenzimidazole; a reducing agent for reducing the complexed divalent copper ions to metallic copper; an alkaline adjusting agent for adjusting the pH value of the composition to an alkaline range suitable for chemical copper plating; and a solvent. The process stability and product yield are improved: through the optimized combination of the core stabilizer, the complexing agent and the reducing agent, the self-decomposition of the copper plating bath is effectively inhibited, the process stability is significantly enhanced, the incidence of key defects such as backlight defects in the metalization of the circuit board hole is greatly reduced, and the high yield of the final product is ensured.

The invention relates to the technical field of organic synthesis, in particular to a method for electrochemical synthesis of a 3-selenium cyano indolizine compound and application of the 3-selenium cyano indolizine compound. According to the method for electrochemical synthesis of the 3-selenium cyano indolizine compound, an indolizine compound, potassium selenide and an electrolyte are added into a solvent to form a reaction system, a graphite felt serves as an anode, a platinum sheet serves as a cathode, a constant-current reaction is conducted at the room temperature in the air atmosphere, the adopted current is 7 mA, and after the reaction is completed, the 3-selenium cyano indolizine compound is obtained. Carrying out post-treatment on the reactant to obtain a compound; the molar ratio of the indolizine compound to the potassium selenide cyanate is 1: (2-3), and the molar concentration of the electrolyte is 0.05 mol / L. The method has the advantages of wide substrate range, simple post-treatment and the like, and a new synthesis route and method are developed for the 3-selenium cyano indolizine compound. The obtained 3-selenium cyano indolizine compound shows remarkable anti-atherosclerosis activity and has the potential of being developed into an anti-atherosclerosis medicine.

The application discloses a detection structure capable of quickly identifying ferroferric oxide, and a preparation method and application thereof. The detection structure comprises a base body, and potassium ferricyanide and ammonium thiocyanate which are respectively adsorbed on opposite ends of the base body. The detection structure can quickly identify whether the ferroferric oxide is contained in a to-be-detected substance. The detection structure has low detection limit, high accuracy and simple operation.

This invention discloses a method for preparing flake potassium cyanate. Urea and potassium borohydride are ground in an agate mortar at a mass ratio of 1:0.10–0.12 for 30–60 minutes to obtain a first substance. The first substance is then spread evenly in a covered crucible and placed in the center of a muffle furnace. A solid-state melting method is used to ensure a complete reaction. The muffle furnace is heated from room temperature at a rate of 3–5 °C per minute. ‑1 The mixture was heated at a rapid rate until it reached 500–600°C, and held for 120 minutes to obtain a second substance. After the reaction was complete, the second substance was allowed to cool naturally, then washed with anhydrous ethanol, centrifuged, dried, and cooled to room temperature to obtain flake potassium cyanate. This invention proposes a novel method for preparing flake potassium cyanate using a solid-state melting method. The process for preparing flake potassium cyanate is simple, completed in one step, and has good application prospects.

The invention relates to the technical field of reservoir transformation, in particular to a hydrogen bond inhibitor for fracturing and capable of reducing adsorption of high-molecular compounds and a preparation method thereof.The hydrogen bond inhibitor for fracturing is obtained according to the following method that potassium cyanate, ammonium chloride and heterocyclic methylamine with the required amount are mixed to obtain a mixture, a solvent with the required amount is added into the mixture to obtain mixed liquid, and the mixed liquid is stirred to be uniform; and heating the mixed solution, continuously refluxing, and irradiating the refluxed mixed solution with an ultraviolet lamp to react, thereby obtaining the hydrogen bond inhibitor for fracturing capable of reducing the adsorption of the high-molecular compound. The preparation and synthesis process is simple, the cost is low, on one hand, the obtained hydrogen bond inhibitor for fracturing capable of reducing adsorption of the high-molecular compound can greatly reduce the adsorption amount of fracturing fluid residues on the rock wall surface, the adsorption amount is reduced by 30% or above, and the yield of a single well after fracturing can be increased; and on the other hand, the obtained hydrogen bond inhibitor for fracturing capable of reducing adsorption of the high-molecular compound does not need to be purified and can be directly applied, so that the production cost is reduced.

The application discloses a method for improving electrochemical carbon dioxide reduction to produce methane under acidic conditions of a copper-based catalyst by using potassium thiocyanate. The method adds potassium thiocyanate into an electrolyte for electrochemical carbon dioxide reduction under acidic conditions of a copper-based catalyst, or simultaneously adds a potassium ion-containing salt and a thiocyanate ion-containing salt, and the existing potassium thiocyanate salt in the electrolyte can effectively regulate the electronic structure of a Cu surface, promote deep hydrogenation of an intermediate in a carbon dioxide reduction reaction, thereby improving the selectivity of methane synthesis, and meeting the needs of industrialized carbon dioxide electro-reduction to produce methane.

This invention relates to a method for preparing and applying a cobalt-deficient cobalt selenide-anchored high-loading Pt single-atom catalyst. Selenium powder is mixed with sodium hydroxide solution to obtain material A. Cobalt salt is mixed with EDTA-2Na solution to obtain material B. Material B and material A are mixed and subjected to a hydrothermal reaction. The resulting product is centrifuged, dried, and dispersed in anhydrous ethanol. Potassium thiocyanate powder is then added, and the mixture is ultrasonically exfoliated, centrifuged, washed, dried, and calcined to obtain Co-deficient cobalt selenide. This cobalt selenide is uniformly dispersed in an ammonium hydroxide aqueous solution. Under alkaline conditions, an ammonia solution containing tetraammineplatinum nitrate is added, and the reaction is carried out at room temperature for 24 hours. After centrifugation, washing, drying, and calcination, the desired product is obtained. This invention provides a simple preparation method that enables rapid and low-cost preparation of Co-deficient cobalt selenide under mild conditions. The Co-deficient cobalt selenide can anchor high-loading Pt single atoms, improving the stability of the Pt single atoms and thus enhancing the catalytic activity and selectivity of the catalyst for oxygen reduction to H₂O₂.

The invention discloses a method for determining the total iron concentration in a citric acid-EDTA decontaminant of a pressurized water reactor nuclear power plant, which comprises the following steps of: adding ammonium persulfate into the decontaminant for determining the concentration of citric acid and EDTA under an acidic condition to completely oxidize and convert Fe < 2 + > in a solution into Fe < 3 + >, adding a potassium thiocyanate-sulfosalicylic acid color developing agent, and measuring the total iron concentration of the citric acid-EDTA decontaminant. Judging the molar concentration ratio of EDTA (Ethylene Diamine Tetraacetic Acid) to Fe < 3 + > in the cleaning solution according to the color of the solution, when the solution is purple or dark red, titrating the test sample by adopting an EDTA standard solution, calculating to obtain the Fe < 3 + > concentration, and adding the Fe < 3 + > concentration and the theoretical iron concentration corresponding to EDTA in the cleaning solution to obtain the total iron concentration under the condition; and when the solution is colorless or faint yellow, determining the concentration of free EDTA in the test sample by adopting an Fe standard solution, then obtaining the molar concentration of EDTA consumed by Fe < 3 + >, and correspondingly obtaining the total iron concentration. The determination method is simple and rapid to operate and high in accuracy, and can meet the total iron concentration test requirements of the citric acid-EDTA decontaminant in the pressurized water reactor nuclear power plant primary loop equipment chemical decontamination process.