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 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 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.