34results about How to "Total pore volume" patented technology

Provided is a method for preparing cerium oxide and zirconium oxide based composite rare earth oxide. The method comprises: (1) preparing a zircon salt solution; (2) prepare an activating agent solution by mixing urea and sulfuric acid or sulfate; (3) heating the zircon salt solution at a room temperature, dropwise adding the activating agent solution slowly, controlling the temperature rise speed to make the temperature raised to 60 degrees centigrade after the addition of the activating agent solution is finished, continuing to raising the temperature to 90 to 95 degrees centigrade, and keeping the temperature for 20-100min to form a basic zirconium sulfate composite salt precursor solution; (4) preparing soluble cerate and rare earth metal salt, adding the soluble cerate and the rare earth metal salt into the basic zirconium sulfate composite salt precursor solution, and performing precipitation by using a soluble hydroxide or ammonia solution; and (5) filtering and cleaning precipitates, and then, calcining the precipitates. Also provided is a cerium oxide and zirconium oxide based composite rare earth oxide prepared by using the method.

The invention discloses a method for preparing a cerium oxide zirconia-based composite rare earth oxide. The method comprises the following steps: (1) heating a zirconium salt solution at room temperature, slowly adding sulfate ions, controlling the heating rate, and adding sulfate ions At the end, the temperature rises to 90-95°C, and then keeps warm for 20-100 minutes to form the precursor of basic zirconium sulfate compound salt; (2) Add cerium salt and rare earth metal salt to the precursor solution and stir evenly to obtain a slurry (3) Precipitating the slurry with a basic carbonate and / or basic oxalate solution to obtain a precipitate; (4) filtering and washing the precipitate obtained in step (3) to remove impurities, and washing The final precipitate is calcined. According to the method of the invention, through the control of raw materials and process conditions, the cerium oxide zirconia-based composite rare earth oxide prepared by it has the characteristics of large total pore volume, high fresh specific surface area and high oxygen storage capacity.

The invention provides an iron-based Fischer-Tropsch catalyst, and a preparation method and an application thereof. The catalyst contains Fe, Cu and / or Mn, K and SiO2, is an amorphous catalyst and basically has no alpha-iron oxide, and pore channels, with the pore size of 1-12 nm, of the catalyst has the specific surface area of more than or equal to 130 m<2> / g and the pore volume of more than or equal to 0.200 cm<3> / g. The invention provides a Fischer-Tropsch synthetic method, wherein the method includes that synthetic gas makes contact with the Fischer-Tropsch synthetic catalyst under Fischer-Tropsch synthetic conditions. The catalyst has high low-temperature activity, for example, the catalyst can have the conversion rate of CO reaching 50% at the temperature of 240 DEG C.

The invention discloses a method for preparing cordyceps sinensis-containing pure powder tablets under low pressure, belonging to the fields of medicines and health care products. The method provided by the invention adopts cordyceps sinensis original grass with water content less than 8% to prepare micro powder, and comprises the steps of carrying out dry tableting under a condition of 0.1-25kN, enabling the prepared tablets to absorb a certain amount of solvent in a liquid vapor environment of water, an ethyl alcohol solvent or an ethyl acetate solvent, then freezing the tablets under a condition of the temperature being below a melting point of the absorbed solvent, and finally, carrying out freeze drying on the frozen samples to obtain the cordyceps sinensis-containing pure powder tablets. The appearance shapes and parameters such as hardness of the cordyceps sinensis-containing tablets are improved while the quality of the prepared tablets meets a tablet quality standard, the tableting pressure in the existing cordyceps sinensis-containing tablet processing technology is greatly reduced, pore channel structures in the tablets are greatly improved, and the pore volumes, pore areas and porosities of the interiors of the tablets are improved. The tablets prepared by the technology are good in appearance and high in yield, the hardness, frangibility and disintegration of the tablets are in accordance with tablet quality requirements, and relevant parameters of the cordyceps sinensis-containing pure powder tablets prepared by the method are better than those of cordyceps sinensis-containing tablets prepared by the existing high-pressure dry powder tablet processing technology.

The invention discloses three-dimensional cellular graphene-like non-metal catalyst and a preparation method and application thereof. The preparation method comprises the steps of fully mixing bean dregs, sodium nitrate, first chlorine salt and second chlorine salt; then performing carbonization treatment under inert gas protection; finally washing to a neutral state through H2O and drying; then soaking in acid for 12 to 24h, washing to a neutral state and drying again to obtain the three-dimensional cellular graphene-like non-metal catalyst. The three-dimensional cellular graphene-like non-metal catalyst prepared by the method has high activity, large specific surface area and large total hole volume, shows good oxygen reduction performance and higher resistance to methanol poisoning in alkaline solution, and accordingly can be used as cathode oxygen reduction catalyst of a fuel cell.

The invention provides a semi-coke-based activated carbon adsorption material and a preparation method and application thereof. The reaction raw materials of the semi-coke-based activated carbon adsorption material include semi-coke powder, potassium hydroxide solution and carbon dioxide gas, wherein the carbon dioxide gas is used as an activator. The preparation method of semi-coke-based activated carbon adsorption material includes: step 1, providing semi-coke powder; step 2, adding semi-coke powder into potassium hydroxide solution, immersing the sample at room temperature to obtain a sample, drying the sample, sealing and storing, and obtaining the impregnated Step 3, the immersed semi-coke is heated up, and carbon dioxide gas is used as an activator to activate, and the activated semi-coke-based activated carbon adsorption material is dried in vacuum and sealed. The semi-coke-based activated carbon adsorption material can effectively improve the removal efficiency of organic sulfur when applied to organic sulfur waste gas such as methyl mercaptan and carbonyl sulfide.

The invention provides a zinc-modified hierarchical porous ZSM-5 nano zeolite. The ZSM-5 nano zeolite has a hierarchical pore structure inside, and zinc particles are coated inside the ZSM-5 nano zeolite. The present invention also provides a preparation method of the catalyst, mixing nanometer ZSM‑5 zeolite with aqueous sodium hydroxide solution to obtain hierarchically porous ZSM‑5 nanometer zeolite, performing ammonium exchange on the hierarchically porous ZSM‑5 nanometer zeolite, impregnating zinc, Then, the silica sol is used to extrude and convert through dry gel to obtain the zinc-modified hierarchical porous ZSM‑5 nanometer zeolite. The zinc-modified hierarchically porous ZSM-5 nano zeolite of the present invention has a hierarchical porous structure, and zinc particles are coated inside the ZSM-5 nano-zeolite, which not only solves the problem of the traditional zinc-modified ZSM-5 zeolite in the methanol-to-aromatics reaction The problem of narrow channels and easy deactivation also solves the problem of low selectivity for zinc-modified mesoporous ZSM-5 zeolite aromatics.

The invention discloses a modified coconut shell activated carbon and its use in the preparation of pharmaceutical grade guanidine hydrochloride; a preparation method of the modified coconut shell activated carbon comprises: providing coconut shell raw materials, pulverizing, sieving and drying the coconut shell raw materials to obtain pretreated coconut shell powder; mix the coconut shell powder with a phosphoric acid solution mixed with 27-hydroxyisomango alkyd, and soak for 10-14 hours to obtain an impregnated mixture; place the impregnated mixture in a muffle furnace for activation , cooling, washing, drying and grinding to obtain modified coconut shell activated carbon. The modified coconut shell activated carbon prepared by the invention has developed pores, has larger specific surface area, total pore volume and microporosity, and has higher heavy metal removal rate and decolorization rate in the preparation of medical grade guanidine hydrochloride.

The invention discloses an activated carbon material and a preparation method thereof and a supercapacitor, which belong to the technical field of electrode materials. The activated carbon material is prepared by taking blocky graphite as a raw material through heating the blocky graphite to 500-700 DEG C at a heating rate of 10-20 DEG C / min; carbonizing the blocky graphite, and heating the blocky graphite to 700-900 DEG C at a heating rate of 0-20 DEG C / min; and feeding activation gas for activating the obtained object, so that an activated carbon material with large specific surface area, large total pore volume and high porosity is obtained. Because the blocky graphite is taken as a raw material, the activated carbon material is wide in source and low in price, thereby saving cost. The preparation method disclosed by the invention is mild in activation conditions, small in energy consumption, environmentally friendly, easy to operate, wide in raw material sources, low in cost, and suitable for large-scale industrial production. The supercapacitor disclosed by the invention takes the activated carbon material prepared according to the invention as an electrode material, so that the specific capacitance and charge-discharge cycle performance of the supercapacitor are improved, and the requirements of the supercapacitor on high specific capacitance and excellent large current properties are met.

The invention relates to a preparation method for an H Beta molecular sieve-containing core-shell catalyst, which includes the following steps: (1) a CuO / ZnO catalyst is prepared by adopting a coprecipitation method; (2) an H Beta molecular sieve is prepared by adopting a hydrothermal synthesis method; (3) the H Beta molecular sieve-containing core-shell catalyst is prepared by adopting a physical coating method. The preparation method is simple and easy to implement, and the coating efficiency is high. The invention further relates to a product obtained by the preparation method and application. The H Beta molecular sieve-containing core-shell catalyst keeps the original characteristics of the CuO / ZnO catalyst and the H Beta molecular sieve, effectively increases the conversion rate of CO per pass, and has high catalyst activity and liquefied petroleum gas (C3-C4) selectivity.

The invention discloses a method for compounding a layered hierarchical pore HKUST-1 material. The method includes steps of dissolving trimesic acid in ethanol, and mixing to obtain solution A; adding Cu (NO)3-3H2O in the water, and mixing to obtain solution B; mixing the solution A with the solution B, and then adding template dimethyl tetradecyl amine (C16H35N), and continuing to mix; filling mixed fluid in a stainless steel high-pressure reaction kettle to perform hydro-thermal synthesis reaction; after ethanol rinsing, performing suction filtration and vacuum drying to obtain the layered hierarchical pore HKUST-1 material. The template dimethyl tetradecyl amine is added as the structure guiding agent to successfully compound the layered hierarchical pore HKUST-1 material; the compounded layered hierarchical pore HKUST-1 material has layering structure as well as hierarchical pore structure, and the structure can reduce the mass transfer resistance during the mass transfer process, improve the spreading rate, and has good application prospect in terms of macromolecular catalyst, absorption, separation and others.