44results about How to "High mesoporosity" patented technology

The invention provides modified active carbon, and a preparation method and application thereof, belonging to the field of preparation of catalyst carriers. The preparation method comprises the following steps: subjecting graphitized active carbon to treatment with HNO3 and then carrying out high-heat treatment in an ammonia gas atmosphere so as to obtain an active carbon carrier with high mesoporosity. The carrier has the characteristics of a great pore volume, high mesoporosity (no less than 97%), good conductivity, etc. When used as a carrier for an ammonia-synthesis catalyst, the carrier can substantially improve the dispersity of the precious metal ruthenium and improves anti-methanation capability, heat stability and activity of the catalyst. The carrier has wide application prospect in the field of catalysis.

A method for producing a titanium dioxide photocatalyst is provided. The method uses a sol-gel process wherein acid and base catalysts are added in two separate steps. According to the method, a titanium dioxide photocatalyst with increased mesoporosity can be produced without the use of any particular additive. Further, an anatase structure is formed upon drying and is maintained even after high-temperature calcination. Further provided is a titanium dioxide photocatalyst produced by the method. Further provided is a titanium dioxide photocatalyst doped with sulfur and zirconium, which is produced by using the method. The doped titanium dioxide photocatalyst exhibits catalytic activity even under visible light and excellent surface characteristics to achieve improved photocatalytic activity.

The invention discloses a camellia oleifera seed shell activated carbon and a preparation process thereof: the activated carbon uses the camellia oleifera seed husk as a carbon source, and after ammoniation, leaching, and steam explosion treatment in advance, extracts active substances in the camellia oleifera seed shell, and then uses three Sulfur oxide-triethylamine compound is used as sulfonating agent, and ammonium bicarbonate is used as activating agent to prepare nitrogen-doped sulfonated mesoporous activated carbon through carbonization and activation. , the nitrogen content is 10-15%, and the specific surface area is 1600-2200m 2 / g, the mesoporosity reaches 48-65%, and the average pore diameter is 4-6nm. The present invention preliminarily extracts tea saponin, tea seed polysaccharide, tea seed protein and other active substances in camellia oleifera seed husks through grading treatment on camellia oleifera seed husks, and then carbonizes and activates them to obtain camellia oleifera seed husk extract and mesoporous Activated carbon, so as to realize the comprehensive utilization of resources and increase the added value of camellia oleifera seed shell, the activated carbon has continuously adjustable mesopore diameter and mesoporosity, and exhibits excellent adsorption, desorption and catalytic performance.

The present disclosure relates to a ternary material, a preparation method thereof, and a lithium ion battery. The ternary active component of the ternary material contains a chemical formula of LiNi x Co y Mn 1‑x‑y O 2 , where 0.5≤x≤0.9, 0.05≤y≤0.2; D of ternary material 99 ≤15μm, D 50 The average pore size is 3-20nm, and the volume ratio of pores with a pore size below 8nm to all pores is 5-30%. The scheme of the present disclosure enables the prepared ternary material to have uniform particle size distribution and high mesoporosity by adjusting the BET specific surface area, sintering and crushing parameters of the precursor in the preparation process, so as to have high specific capacity, high rate capability and Good high temperature cycle performance and low temperature discharge performance.

The invention discloses a preparation method of activated carbon / lithium titanate composite electrode material, comprising the following steps: according to the atomic ratio of lithium (Li) and titanium (Ti) being 0.80-0.90:1, dihydrate lithium acetate and titanium alkoxide Dissolved in an alcoholic solvent to obtain the first solution; according to the mass ratio of phenolic resin and titanium alkoxide as 3 to 6:1, the phenolic resin was dissolved in an alcoholic solvent to obtain a second solution; the first solution Mix with the second solution, and polymerize; stir the polymer, and seal it, solvent heat treatment at 140~200°C for 4-10h, take out and dry to obtain the precursor powder; use carbon dioxide gas to physically carry out the precursor powder Activation, the activation temperature is 700-900° C., the activation time is 2-5 hours, and the activated carbon / lithium titanate composite electrode material is obtained. The present invention also provides an activated carbon / lithium titanate composite electrode material obtained by the above method, and a supercapacitor using the above composite material.

The invention provides a preparation method of a high mesoporous rate nitrogen doped carbon electrode material. The preparation method comprises the following steps: step one, pretreatment; step two,hydrothermal reaction: carrying out the hydrothermal reaction on bamboo shoot shells to obtain a hydrochar precursor; step three, carbonation reaction: filtering, washing and drying the hydrochar precursor and then carrying out low temperature carbonization treatment on the dried hydrochar precursor and a nitrogen source material to obtain carbide; step four, activating treatment: carrying out theactivating treatment on the carbide and an activator, carrying out acid pickling, washing with deionized water and drying to obtain the high mesoporous rate nitrogen doped carbon electrode material of which an aperture main peak is 2.8nm. A symmetric supercapacitor assembled by applying an electrode material provided by the invention has the effects that specific capacitance reaches as high as 209F / g when current density is 0.5A / g; especially when the high current density is 10A / g, the symmetric supercapacitor has excellent stability, and the capacitance still reaches as high as 95 percent ofinitial capacitance after 10,000 cycles of charge and discharge.