30results about How to "Increase active sites" patented technology

The invention disclose a preparation method of a fluorine removal agent for water. The method includes: waste concrete is used as the raw material and subjected to primary crushing and calcining to screen out set cement, and the set cement is subjected to ball milling and powder selection and separation to collect particles with the particle size being below 80 micrometers so as to obtain the fluorine removal agent for water. The preparation method has the advantages that the waste concrete is used to prepare the fluorine removal agent, and the method is wide in raw material source and low in cost and provides a new approach for the recycling of the waste concrete; the method which is simple to operate, widely applicable, low in cost, environmentally friendly and capable of using waste materials to treat pollution is provided for the treatment of fluorine-containing wastewater of rivers and lakes of China, industrial and domestic fluorine-containing wastewater of China, and the like; the recycling efficiency of waste set cement is increased, and a technical path is provided for the high-additional-value utilization of the hardened cement paste in the waste concrete.

The invention relates to a method for preparing a bayberry-shaped cobalt-nickel-boron composite carbon material proton membrane fuel cell catalyst. The nanomaterial active substance is a bayberry-shaped cobalt-nickel-boron composite carbon material, referred to as CoNi@TA / B. Solve the existing problems of existing fuel cell catalysts and overcome the defects of the prior art. At present, fuel cell catalysts generally face the problems of single precursor and synthesis cost, as well as defects such as high cost and toxicity of Pt-based catalytic materials; based on CoNi MOF With a unique structure, a metal-organic framework nanocomposite material for proton membrane fuel cells has been developed, which has high onset potential, half-slope potential, excellent limiting current, excellent stability and good methanol tolerance, It has the advantages of strong resistance to methanol poisoning.

The invention relates to a nano iron nitride-carbon composite catalyst for a lithium-air battery and a preparation method of the composite catalyst. The method comprises the steps of feeding iron salt, organic ligand and a surface active agent into a solvent, and carrying out heating reflux; mixing the obtained nano-sized mesoporous metal organic framework complex and a nitrogenous organic compound, and carrying out heat treatment on the mixture in the presence of ammonia gas to realize carbonization and nitridation by one step. The catalyst is formed by compounding nanoscale primary iron nitride particles and carbon material; carbon covers and partly covers the surfaces of the nanoscale primary iron nitride particles; rich mesoporous gaps exist among the stacked nanoscale primary iron nitride particles. The rich mesoporous structure of a precursor is maintained by the catalyst, the catalyst has large specific surface area and high porosity, and is beneficial to diffusing oxygen molecules into the catalyst material particles, so that the contact between oxygen and the catalyst is promoted, and the utilization rate of the catalyst is increased; the electrical conductivity is effectively improved by the carbon material on the surfaces of the particles; the nano iron nitride-carbon composite catalyst is good in stability, so that the catalytic performance is well exerted. The charge and discharge polarization of the lithium-air battery is effectively reduced; furthermore, the method is simple and convenient, the operation is easy, the cost is low, and large-scale production can be easily implemented.

The invention provides a preparation method of a carbon negative plate electrode, which comprises the following steps: preparation of polyaniline / activated carbon composite material, preparation of nitrogen-doped porous activated carbon, preparation of TiC / yttria / nitrogen-doped porous activated carbon ternary composite material, and preparation of a carbon negative plate electrode. The preparationmethod has the advantages that the hydrogen evolution rate of the carbon negative plate electrode is reduced, the specific capacitance is increased, the problem that the working potentials of the carbon electrode and the lead electrode in the super lead-acid battery are not matched, the hydrogen evolution at the end of charging is serious and the like are solved, and the cycle life of the super lead acid battery is increased. The carbon negative plate electrode is stable in production process, easy to operate, reliable in quality, low in cost, light in weight, recyclable, non-polluting, etc.The material of the carbon negative plate electrode of the super lead acid battery meets the basic requirements of commercialization.

The present invention is applicable to the technical field of catalysts, and provides a method for preparing a porous carbon-nitrogen material-supported nano-bimetallic catalyst, including step 1, preparation of a biomass-based porous carbon-nitrogen carrier material; pretreatment, high-temperature pyrolysis, cleaning and drying, Grinding; Step 2, preparation of porous carbon-nitrogen loaded Fe / CoS2 / HCCS nano-bimetallic catalyst; a method for using porous carbon-nitrogen material-loaded nano-bimetallic catalyst in benzoic acid hydrogenation reaction, benzoic acid, solvent and porous The mixture of carbon-nitrogen material-loaded nanometer bimetallic catalysts is sealed in a reaction kettle for reaction. Thereby, the invention can enhance the dispersibility of the catalyst in the reaction solvent, increase the active sites of the carbon material, enhance the activity of the catalyst synergistically with the double metal, and increase the product yield.

The invention provides a preparation method of a heavy metal ion remover. Discarded hardened cement concrete is used as a raw material. The preparation method comprises the steps: primary crushing andpresintering; smashing and separation; ball milling and activation; and powder separation. Heavy metal ions in wastewater containing copper, zinc, chromium, nickel and the like can be effectively removed, and an implementation process of a technical method has the advantages that the speed for removing the heavy metal ions is high, the reaction time is short, the removal effect is stable, and themethod can be operated at room temperature. The technical application of a building waste, namely hardened cement stone in discarded concrete, is widened to the field of heavy metal sewage treatment,no problem of limit mixing amount exists, the recycling efficiency of the discarded cement stone is increased, and the economic additional value of the discarded cement stone is increased.

The invention discloses a highly dispersed heavy hydrocarbon Fischer-Tropsch synthesis catalyst based on a carbonization treatment method and a preparation method thereof. The preparation method of the highly dispersed heavy hydrocarbon Fischer-Tropsch synthesis catalyst comprises the following steps: using an impregnation method to load a soluble salt of a metal additive on a shaped carrier, and obtain a pretreated carrier through drying and roasting; And the organic matter is loaded on the pretreatment carrier, and it is obtained after drying. The present invention introduces the process of "carbonization" treatment in the evaluation step "reduction-Fischer-Tropsch synthesis" of conventional catalysts, and optimizes it to "reduction-synthesis gas treatment-carbonization-H 2 After the above-mentioned catalyst, the average grain size of Co decreases; the carbonized catalyst undergoes a second reduction to remove excess carbon deposits, thereby improving the Fischer-Tropsch reaction activity of the catalyst; after the second reduction, not only the crystal The particle size is reduced, the active sites are increased, and the reduction degree of the catalyst will be further improved, which leads to the improvement of the catalyst performance.

The invention relates to a preparation method of a sulfur-fixing ash-based coal-fired power plant flue gas mercury removal adsorbent. At present, there is no energy-saving, environmentally friendly, and simple-to-operate preparation method for the sulfur-fixing ash-based coal-fired power plant flue gas mercury removal adsorbent. The present invention is characterized in that it comprises the following steps: (1) taking by weight 60-80 parts of sulfur-fixing ash, 10-15 parts of clay, 5-10 parts of activated carbon and 5-15 parts of bromide, And add water to mix evenly, impregnate for 4-8h, use a mixer to stir at a constant speed during the impregnation modification; (2) adopt the cold-setting molding process, use the granulator to make the impregnated and modified adsorbent into spherical particles, and place it in a natural state (3) Place the naturally dried spherical adsorbent particles in a vacuum drying oven to dry for 12-24 hours, then take them out and cool them to room temperature in a desiccator to obtain sulfur-fixed ash fume Mercury removal adsorbent. The invention can effectively reduce the cost and is easy to operate.