32results about How to "Simple activation process" patented technology

The invention provides a preparation method of a macropore activated carbon fiber, the strength of which is larger than 0.3 GPa. The preparation method comprises the following steps: a carbon fiber is soaked in mixed aqueous solution of sodium salt and acid for 12-24 hours, and dried under 100 DEG C after being taken out; then, the carbon fiber is put into an activation furnace, and heated to 800-1100 DEG C under the protection of inert gases; at the same time, vapour is introduced to activate the fiber for 0.5-1 hour. The strength of the obtained activated carbon fiber can reach 0.3-0.5 GPa,and the service life of the activated carbon fiber can be prolonged; the aperture of macropores on the surface of the obtained activated carbon fiber is 50-600 nm, thereby favoring the absorption of materials of large sizes. The preparation method directly utilizes the carbon fiber as the raw material, the activation process is simple, and the product strength is higher.

The invention belongs to the technical field of organic catalysis, and particularly relates to a preparation method of catalyst crystal and application of the catalyst crystal in catalytic degradation of organic wastewater, particularly, in catalytic degradation of 2,4-dichlorophenol. According to the preparation method, ammonium paramolybdate is adopted as a molybdenum source, melamine is adopted as a nitrogen source, ferric rhodanide is adopted as a sulfur source and an iron source to modify titanium dioxide, and brown catalyst crystal is prepared through in-situ reaction. A relatively high specific surface and catalytic activity are achieved, and the degradation rate for the 2,4-dichlorophenol is as high as 99% or greater.

The invention relates to preparation of electrodes of fuel cells and aims at providing an air cathode without a metal catalyst and a preparation method thereof. The air cathode comprises a carbon cloth or a stainless steel mesh as a base material. Both sides of the base material are respectively coated by diffusion layers and catalyst layers, wherein the diffusion layers are contacted with the air and the catalyst layers are contacted with electrolyte. The cathode of the invention is composed of multiple diffusion layers and catalyst layers, reduces loss of water due to evaporation and improves stability of the electrodes. One side of the cathode directly faces the air and oxygen is directly diffused to the catalytic surface of the cathode without additional air supply devices and drivingforce, thus greatly lowering the operation cost of the cell and improving the stability. The catalytic materials of the cathodes are active carbons featuring wide sources and low prices, without any metal catalyst, thus greatly reducing the constructive cost. The air electrode has the characteristics of simple structure, low cost and easy expansion and can be used for producing microbial fuel cells with high properties and low costs and simultaneously purify waste water.

The invention relates to a concrete admixture, Which is made from a A component and a B component by steps of mixing, calcining and grinding; the A component includes following raw materials: coal gangue of 70 to 90 amounts by weight; limestone of 10 to 30 amounts by weight; gypsum of 2 to 5 amounts by weight; fluorite of 0.5 to 1.5 amounts by weight; The B component is standard coal; The calorific value of the mixed A and B components is more than 1600 kcal / kg. The invention also provides a method of preparing above mentioned concrete admixture by calcining coal gangue with a fluidized bed roaster, That is mixing the components well and sending into the fluidized bed roaster calcining for one to two hours at a temperature of 800 to 900 degrees, And then pulling out of the roaster for cooling, At last grinding into fine powder and screening to obtain products. The invention uses a simple technology, Increases utilization rate of coal gangue, Which is benefit for full use of the coal gangue, Being used as concrete admixture, With the advantages of more than 30% to 50% active amount, Low cost, Which can increasing intensity of concrete, Increasing impermeability and durability performance, And excellent performance.

The invention relates to a hydrogen storage alloy with high hydrogen storage capacity and a preparation method thereof. The hydrogen storage alloy with high hydrogen storage capacity is AB 2 Type, the A side is composed of Ti and Zr elements, the B side is composed of Mn, Cr, Fe elements, and the general chemical formula is Ti a Zr 1‑a mn b Cr c Fe d , where, 0.55≤a≤0.78, 0.8≤b≤1.0, 0.7≤c≤0.85, 0≤d≤0.25, 1.7≤b+c+d≤2.0. The hydrogen storage alloy of the present invention has a high hydrogen storage capacity, and can reach a hydrogen storage capacity of 1.70wt% or more after being activated three times under the conditions of a temperature of 180°C and a hydrogen pressure of 1.25Mpa, and is used in the field of metal solid-state hydrogen storage. Better market prospects.

The invention discloses a method for preparing nickel-base metal supported catalyst. The preparation method comprises the steps of reducing a nickel-base layered hydrotalcite precursor for 1 to 12 hours by use of hydrogen in hydrogen atmosphere at a temperature between 200 and 800 DEG C and directly generating the nickel-base metal supported catalyst. The composition of the nickel-base layered hydrotalcite precursor is Ni1-y-xMxAly(OH)2(CO3)y / 2+x(z-2) / 2.nH2O, wherein x is between 0 and 0.5; y is between 0.1 and 0.33; z is a valence of M; and the M is Fe, Co, Cu, Sn, Mg, Zn, La or Ce. As a direct H2 reduction-activation method leaves out the step of intermediate roasting, the method has the advantages of simplifying a catalyst- activating process and reducing energy consumption, and is an optimal option for preparing a metal supported catalyst by reducing and activating a catalyst precursor which contains a transitional metal catalyst prepared by a precipitation method.

The invention relates to the field of fine chemical industry, in particular to a method for preparing isooctyl p-dimethylaminobenzoate through hydrogenation using water as a solvent. The method for preparing isooctyl p-dimethylaminobenzoate by hydrogenation using water as a solvent in the present invention is characterized in that it comprises the following steps: (1) adding water, isooctyl p-nitrobenzoate and active nickel catalyst in proportion Reactor; (2) Heating to 100°C, introducing hydrogen gas, heat-retaining and pressure-retaining reaction until no hydrogen is absorbed; (3) cooling down, adding paraformaldehyde to the reactor, and then adding active nickel catalyst in proportion; (4) Heat until, feed in hydrogen, keep warm and pressurize until no hydrogen is absorbed; (5) Continue to keep warm and keep pressure for several hours, stop the reaction, and take samples for analysis; layer, the water layer is discharged into the sewage system, and the oil layer enters the distillation tower; (7) heat up, the distillation tower is rectified and purified until it meets the product specifications, and then it is packed in barrels.

The invention relates to a regenerative adsorption material and a preparation method thereof, belonging to the technical field of preparation of environmental protection materials. The preparation method comprises the following steps: placing an activated sludge adsorption material prepared from excess activated sludge in a water body, and treating the algae and the algae in the water body. The pollutants are adsorbed to obtain precipitation, and then the precipitate is separated, and the separated precipitate is sequentially subjected to drying treatment, carbonization treatment, and water vapor activation treatment to obtain a regenerated composite adsorption material. Because the organic matter content of the regenerated composite adsorption material prepared by the invention is significantly increased, the carbonized regeneration composite adsorption material is a multi-component phase, has multi-shaped pores, and the pore size structure and specific surface area are significantly improved, so that the adsorption effect is better. And it is easy to reuse the waste.

The invention relates to a method for preparing an iron-containing soil conditioner, which comprises the steps of preparing ferrous ammonium citrate; the preparation step of ferrous ammonium citrate; Add iron powder to stir the reaction, cool down after the reaction, pass through ammonia gas to neutralize to pH 5.5-6.5, remove water, and obtain ferrous ammonium citrate. In the present invention, ferrous ammonium citrate is added to low-rank coal to make The water-insoluble humic acid in low-rank coal is activated into water-soluble humic acid. The activation process is simple, and the activation rate of humic acid can reach more than 50%. The iron element in the prepared iron-containing soil conditioner is divalent iron, which is easier Absorbed by crops, in addition, ammonium citrate, ammonium humate and the entire pH buffer system are conducive to the stability of ferrous ammonium citrate. Iron phenomenon, to avoid crop yellowing.

The invention discloses a method for removing wax before electroplating steel parts for a pump. The method comprises the following operation steps that 3-5 steel parts are connected in parallel and then are placed in a phosphorus-free cleaning fluid as cathodes, a direct current is conducted, and the wax is removed through electrolysis. According to the method for removing the wax through the electrolysis, the wax removing efficiency is high, and the wax removing speed is high; the cleaning liquid does not contain phosphorus, so that no pollution is caused to the environment; the cleaning liquid is stable, and almost no foam is generated during electrolysis, so that the danger that explosion is caused due to the fact that the foam encounters electric sparks is avoided; and moreover, the cleaning fluid can be recycled, so that the production cost is reduced, and the environmental protection is facilitated.