10 results about "Formic acid oxidation" patented technology

This invention relates to the field of terephthalic acid oxidation residue technology, specifically a high-efficiency treatment method for terephthalic acid oxidation residue, comprising the following steps: S1. Pretreatment; S2. Separation; S3. Evaporation and concentration; S4. Incineration; S5. Ash dissolution; S6. Filtration; S7. Sodium carbonate recovery; S8. Sodium carbonate recycling; S9. Bromine recovery and utilization; S10. Cobalt-manganese catalyst recovery; S11. Precipitate treatment; S12. Cobalt-manganese catalyst recycling. This application utilizes the waste heat or residual heat from the top of the xylene oxidation unit as a heat source to heat and concentrate the first filtrate. The acetic acid flash evaporator in the crystallizer serves as the heat source for evaporator V3 to evaporate and concentrate sodium carbonate, reducing process energy consumption and improving sodium carbonate recovery efficiency. The incineration unit heats the furnace body through external and internal incineration components, achieving efficient incineration of the material, greatly increasing the material's heating efficiency, and improving incineration efficiency and energy utilization.

The application discloses a polyformaldehyde wastewater comprehensive treatment method, which comprises the following steps: pumping polyformaldehyde wastewater to a gas-liquid mixer, introducing ozone into the gas-liquid mixer to mix with the polyformaldehyde wastewater, preheating, and then entering a fixed-bed catalytic reactor, under the action of a catalyst, the ozone oxidizes formaldehyde and methanol in the wastewater into formic acid; pumping the oxidized material liquid to a neutralization tank, adding sodium hydroxide solution into the neutralization tank, so that the sodium hydroxide reacts with the formic acid in the wastewater to generate sodium formate, pumping the neutralized material liquid to a buffer tank; sending the wastewater in the buffer tank to a two-effect evaporator to evaporate and concentrate, after heat exchange and condensation, the steam flows into a wastewater tank, the residual wastewater is pumped to a sewage treatment plant for treatment and discharge, the concentrated liquid is cooled and flows into a concentrated liquid storage tank, and the concentrated liquid can be used as a single carbon source or a raw material of a composite carbon source to be regularly loaded and sold. The application fully recycles useful components in the polyformaldehyde wastewater, by-products of 20-30% sodium formate solution products are obtained, and resource waste is avoided to the maximum extent.

The application belongs to the technical field of catalysts, and provides a one-dimensional platinum-based catalyst, a preparation method and application thereof. The one-dimensional platinum-based catalyst has a nanorod structure and is a platinum-tellurium-bismuth catalyst or a bismuth-doped platinum-tellurium catalyst. The preparation method comprises the following steps: (1) in the presence of a dispersing agent, performing a hydrothermal reaction on a platinum precursor, a tellurium precursor, a bismuth precursor and ascorbic acid in an aqueous solvent to form a platinum-tellurium-bismuth ternary heterogeneous phase alloy; (2) loading the platinum-tellurium-bismuth ternary heterogeneous phase alloy on a carbon material to obtain a platinum-tellurium-bismuth catalyst; optionally, the method further comprises the following step: (3) performing acid treatment on the platinum-tellurium-bismuth catalyst obtained in step (2) to dealloy, thereby obtaining a bismuth-doped platinum-tellurium catalyst. The catalyst exhibits excellent electrocatalytic activity and stability in a formic acid oxidation reaction.

The application provides a multi-component platinum-bismuth-based intermetallic ordered nanosheet and a preparation method and application thereof, and relates to the technical field of multi-metal alloy catalysts.The multi-component platinum-bismuth-based intermetallic ordered nanosheet provided by the application comprises platinum elements, bismuth elements and auxiliary metal elements, the auxiliary elements comprise 1-4 kinds of iridium elements, ruthenium elements, osmium elements, rhodium elements, tin elements and lead elements, and the multi-component platinum-bismuth-based intermetallic ordered nanosheet has an intermetallic ordered structure and a two-dimensional nanosheet morphology.The multi-component platinum-bismuth-based intermetallic ordered nanosheet provided by the application is structurally stable, is applied to a fuel cell as a catalyst, and has excellent electrocatalytic performance, including formic acid oxidation electrocatalytic performance and alcohol oxidation electrocatalytic performance.The application provides a preparation method of the multi-component platinum-bismuth-based intermetallic ordered nanosheet, the preparation conditions are mild and simple to operate, and problems such as catalyst agglomeration caused by high-temperature calcination to transform an ordered phase are effectively avoided.

The invention belongs to the field of multi-component platinum-based nano catalyst synthesis and fuel cell device application research, and particularly relates to a three-component platinum-bismuth rare earth alloy catalyst, a preparation method thereof and application of the three-component platinum-bismuth rare earth alloy catalyst in formic acid catalytic reaction. The preparation method of the three-component platinum-bismuth rare earth alloy catalyst comprises the following steps: ultrasonically dispersing a platinum precursor, a bismuth precursor, a rare earth element precursor and a carbon carrier uniformly in a solvent, heating and stirring until the mixture is dried by distillation, grinding, and calcining the obtained ground material in hydrogen-containing gas. The three-component platinum-bismuth rare earth alloy catalyst obtained by the method has efficient catalytic action under two catalytic conditions of formic acid oxidation reaction and membrane electrode in a direct formic acid fuel cell, and is far higher than that of a commercial platinum-carbon catalyst, especially a catalyst with a rare earth element of terbium; the catalyst shows excellent catalytic activity and stability in formic acid oxidation reaction of a direct formic acid fuel cell and in a membrane electrode, and has a wide application prospect.

The invention relates to a method for synthesizing 5-methylpyrazine-2-formic acid-4-oxide through microchannel continuous flow, and belongs to the technical field of pharmaceutical chemistry and chemical process strengthening. According to the method, 5-methylpyrazine-2-carboxylic acid and hydrogen peroxide are used as raw materials, phosphoric acid, an inorganic salt catalyst and a small amount of hydrogen peroxide stabilizer are used as a catalytic system, water is used as a solvent, a phosphoric acid-inorganic salt catalyst synergistic catalytic system is constructed, and a pH differential feeding method is adopted, so that the reaction rate, selectivity and safety are synchronously improved; the invention relates to a process technology for preparing 5-methylpyrazine-2-formic acid-4-oxide in a continuous flow microchannel reactor. The method has the advantages of mild reaction conditions, short reaction time and high raw material utilization rate, can realize effective control in the reaction process, and provides a new method for safe production of 5-methylpyrazine-2-formic acid-4-oxide.

The present application relates to carbon supported rhodium-based ordered intermetallic compound and preparation and application as catalyst, and belongs to the technical field of liquid fuel cell. The preparation method is that carbon carrier is dispersed in a solution of rhodium salt and non-noble metal salt, or the carbon carrier is dispersed in a solution of rhodium salt, other platinum group metal salt and non-noble metal salt, and the metal salt is loaded on the carbon carrier; the dried sample is ground and subjected to two-step heat treatment at low temperature and high temperature under a reducing atmosphere to obtain carbon supported rhodium intermetallic compound. The rhodium intermetallic compound electrocatalyst reduces the overpotential of formic acid oxidation reaction, and improves the catalytic activity, which is significantly superior to the catalytic performance of single metal rhodium, and the catalyst synthesis method is simple and feasible, and is suitable for mass production.

This invention relates to the field of terephthalic acid oxidation residue technology, specifically a high-efficiency treatment method for terephthalic acid oxidation residue. The method includes the following steps: S1. Pretreatment; S2. Separation; S3. Evaporation and concentration; S4. Incineration; S5. Ash dissolution; S6. Filtration; S7. Sodium carbonate recovery; S8. Sodium carbonate recycling; S9. Bromine recovery and utilization; S10. Cobalt-manganese catalyst recovery; S11. Precipitate treatment; S12. Cobalt-manganese catalyst recycling. This application utilizes the waste heat or residual heat from the top of the xylene oxidation unit as a heat source to heat and concentrate the first filtrate. The acetic acid flash evaporator in the crystallizer serves as the heat source for evaporator V3 to evaporate and concentrate sodium carbonate, reducing process energy consumption and improving sodium carbonate recovery efficiency. Simultaneously, it achieves the conversion of organic matter in the residue into carbonates for recycling, and realizes the recovery and recycling of the cobalt-manganese-bromine catalyst in the residue.

This invention discloses a palladium-based alloy catalyst, its preparation method, and its application in formic acid fuel cells, belonging to the field of palladium catalyst electrocatalysis technology. The catalyst prepared by this invention is a ruthenium-doped two-dimensional palladium-based alloy catalyst, which has an ordered mesoporous two-dimensional nanosheet structure. In the preparation process, dodecyltriruthenium is selected as the ruthenium source. Under heating conditions, it decomposes to form CO, which acts as a structure directing agent, inducing the formation of two-dimensional nanosheets and effectively inhibiting the aggregation of metal atoms. During this process, the interaction between palladium and ruthenium metal atoms leads to the formation of ordered mesopores in the catalyst. The surface morphology of the catalyst can be flexibly controlled by controlling the amount of ruthenium metal atoms incorporated. The obtained catalyst exhibits excellent formic acid oxidation performance.

This invention discloses an anode catalyst for high-concentration formic acid fuel cells, and for the first time synthesizes a three-dimensional Pt / Bi₂Te₃ nanocomposite material with a width of 600–900 nm and a thickness of 55–80 nm. Its performance at 0.1 mol / L... ‑1 Perchloric acid and 3.0 mol L ‑1 The mass activity of formic acid oxidation in a mixed formic acid solution is 8.2 A mg. ‑1 The surface activity is 11.8 mA cm⁻¹. ‑2 These figures are 15.7 and 13.1 times higher than those of commercially available carbon-supported platinum, respectively. In stability testing, the three-dimensional Pt / Bi₂Te₃ nanocomposite exhibited a residual activity of 1.33 A mg after a 3600 s iterative test. ‑1 It is 221.6 times that of commercial Pt / C. At 15.0 mol L⁻¹ ‑1 In a practical direct formic acid fuel cell using formic acid as fuel, the peak power density of the three-dimensional Pt / Bi₂Te₃ nanocomposite material is 156.1 mW / cm². ‑2 The peak power density of commercially available carbon-supported platinum is only 77.0 mW / cm². ‑2 .