106results about How to "Uniform pores" patented technology

The invention relates to a preparation method for a Cu-Zn-Zr mesoporous catalyst, which belongs to the technical field of catalyst preparation. The method comprises the following steps: uniformly mixing a copper salt, a zinc salt and a zircon salt so as to obtain a mixed salt solution; adding powder of a mesoporous template SBA-15 into the mixed salt solution prepared in the previous step so as to obtain a catalyst mixed salt solution; evaporating all the solvents in the catalyst mixed salt solution prepared in the previous step so as to obtain a catalyst mixed salt and repeating dipping twice to three times according to the above-mentioned steps so as to obtain a final dipped catalyst mixed salt; and roasting the final dipped catalyst mixed salt so as to obtain a roasting product and washing and drying the roasting product so as to obtain the Cu-Zn-Zr mesoporous catalyst. The Cu-Zn-Zr mesoporous catalyst prepared by using the method has a high specific surface area, narrow pore size distribution and uniform pore channels and shows high catalytic activity during synthesis of methanol through carbon dioxide hydrogenation at low temperature.

The invention discloses a porous ceramic film and a preparation method thereof and belongs to the technical field of porous ceramic films. The porous ceramic film is of a multistage structure and comprises a film layer, a transition layer and a porous supporting body; the film layer is prepared by sintering low-activity nanometer particles with dense sphere and a middle transition phase; the transition layer is prepared by sintering conventional irregular micro-powder; and the film layer and the transition layer are sintered by one time under the same condition. The preparation method comprises the following steps: enabling the transition layer particles and the film layer particles to disperse in a polyvinyl alcohol (PVA) aqueous solution to obtain transition layer slurry and film layer slurry; depositing the transition layer on the surface of the porous supporting body by using a dipping-pulling method, and drying; preparing the film layer on the surface of the transition layer by using the dipping-pulling method, and drying to obtain a ceramic film green body; and finally, obtaining the porous ceramic film through one-step sintering. The porous ceramic film has very good effect on treating suspended matters and can be used in the fields of printing and dyeing material recovery, beverage clarification, powder preparation, oil-water separation and the like.

The invention relates to a pitting electrolyte and a production method of an electrode foil with high specific surface area for an aluminum electrolytic capacitor. The pitting electrolyte mainly contains aluminum chloride and sulfuric acid solution. The production method comprises a first pre-treatment step, a second anode oxidization step, a third acid pickling step, a fourth corrosion pitting step, a fifth hole expansion step and a sixth post-treatment step. The invention has simple process, convenient operation and less environment pollution. The electrode foil for the aluminum electrolytic capacitor produced by the invention has optimal normal distributions in hole diameter distribution, hole area and minimal hole pitch distribution, thus achieving uniform pitting capable of controlling the corrosion start point and greatly improving the specific capacity of the electrode foil for the aluminum electrolytic capacitor. Accordingly, the prepared aluminum electrolytic capacitor has a specific surface area of 10% to 15% and a specific capacity up to 0.70 to 0.75 muF / cm<2>.

A process for producing a silicon carbide-based heat-resistant, ultra-lightweight, porous structural material having the shape of a spongy porous body.