4results about How to "Lower catalytic temperature" patented technology

The invention discloses a sulfur hexafluoride degradation catalyst as well as a preparation method and application thereof in catalytic degradation of SF6 (sulfur hexafluoride). The preparation method comprises the following steps: (1) adding pseudo-boehmite and / or cerous nitrate into deionized water to be fully dissolved, and stirring to be in an emulsion or solution state; sequentially adding phosphoric acid, a silicon source and a template agent while stirring, and adjusting the pH value of the mixed solution to 5.0-6.5; (2) stirring and evaporating moisture in the mixed solution obtained in the step (1), and further drying to obtain dry glue; grinding the dry glue, putting the ground dry glue into a crystallization kettle, crystallizing at 200-210 DEG C, washing a crystallized product to be neutral, drying, and calcining to remove the template agent, so as to obtain the Al and / or Ce doped SF6 degradation catalyst. The catalyst is used for catalytic degradation of sulfur hexafluoride and is low in catalytic temperature, excellent in degradation effect, excellent in SO2 selectivity, small in product harm, easy to treat, simple in catalyst preparation process and low in use cost.

The present invention discloses a method for preparing a composite catalyst for low-temperature synergistic denitration and dioxin removal. The method comprises adding a molecular sieve modified with metal oxides of cobalt, nickel, palladium, and platinum as a single or combined component to a vanadium-based denitration catalyst to obtain a modified denitration catalyst, and mixing and pasting the activated carbon powder modified with an organic alkali solution with the modified denitration catalyst, and then preparing the composite catalyst through extrusion, drying, and calcination processes. The composite catalyst of the present invention reduces the catalytic temperature of the denitration catalyst and improves the denitration efficiency of flue gas; the activity of the hydroxyl and carboxyl groups of the modified activated carbon is enhanced, and the removal efficiency of dioxins is improved; the modified activated carbon and the modified denitration catalyst are physically combined to achieve synergistic effects on NO in flue gas. X , and efficiently remove dioxins, thereby increasing the service life of the composite catalyst.

The application relates to the technical field of 3D printing and catalytic material preparation, and discloses a VOCs oxidation catalyst, a preparation method thereof and application of the VOCs oxidation catalyst in catalytic oxidation of VOCs. The preparation method of the catalyst comprises the following steps: obtaining an embryo with a hollow lattice structure through 3D printing; performing defatting, sintering and alkali treatment on the embryo to obtain a 3D printed ceramic carrier; loading catalyst slurry on the surface of the 3D printed ceramic carrier, and then performing drying and calcination treatment to obtain the VOCs oxidation catalyst. The VOCs oxidation catalyst is prepared through the above method, is rich in interconnected pores, has a large specific surface area and a high catalyst loading capacity, has a low catalytic temperature, and can realize catalytic oxidation of VOCs at a high air speed and a low temperature.

This application belongs to the field of battery technology, and particularly relates to silicon-carbon composite materials and their preparation methods, electrodes, and batteries. The method includes: mixing asphalt with potassium hydroxide and dopants uniformly, heating to a first preset temperature, passing a crosslinking agent mixed gas at a first preset flow rate for first activation, cooling to obtain asphalt-based porous carbon; adding the asphalt-based porous carbon to an aldehyde compound solution, then adding a phenolic compound and a catalyst and mixing uniformly, performing a hydrothermal reaction, filtering, and performing a second activation to obtain a hard carbon-coated soft carbon porous carbon composite material; immersing the porous carbon composite material in a liquid silane solution and reacting under closed negative pressure to obtain an intermediate material; heating the asphalt to a molten state, then adding the intermediate material and an organoniobium compound and stirring uniformly to perform carbonization to obtain a silicon-carbon composite material; possessing low expansion, high pore volume, low impedance, and high compaction density, thus improving the electrochemical performance of the battery.