40results about How to "Reduce active sites" patented technology

In the field of carbon airgel synthesis, the present invention discloses a device and method for preparing carbon airgel by CVD after carbon nanotubes are activated by an electric arc. The vacuum system is connected to the pipeline of the carbon nanotube storage tank, the carbon nanotube storage tank is provided with a carbon nanotube feed port, the left side of the carbon nanotube feed port is provided with an inert carrier gas inlet, and the inert carrier gas inlet passes through the pipeline It is connected to the left end of the reactor, the reactor is equipped with an arc generator, the reactor is equipped with a carbon source inlet, the outside of the reactor is equipped with a temperature control system, and the right end of the reactor is connected to the pipeline of the finished product collection storage tank. The invention uses the high temperature of a high-power arc to excite the metal into fine nano-scale gaseous particles, which can be uniformly coated on the surface of the carbon nanotubes, and then the carbon airgel grown by CVD has a high degree of graphitization and a lower bulk density. Low thermal conductivity and good thermal insulation performance. The device of the invention has simple structure, stable and easy-to-control method, and the continuous preparation of carbon nanotube aerogels with different property indexes can be realized by switching the electric arc power.

The invention discloses a method for utilizing a carbon nitride / nitrogen doped mesoporous carbon / bismuth trioxide ternary Z-type light catalyst to catalyze and remove antibiotics. The method adopts the hollow carbon / nitrogen doped mesoporous carbon nitride / bismuth trioxide ternary Z-type photocatalyst to treat antibiotics, the hollow carbon / nitrogen doped mesoporous carbon nitride / bismuth trioxideternary Z-type photocatalyst uses graphite-phase carbon nitride as a carrier, and its surface is modified with nitrogen doped hollow mesoporous carbon and bismuth oxide. The method utilizes the carbon nitride / nitrogen doped mesoporous carbon / bismuth trioxide ternary Z-type light catalyst to conduct photocatalytic degradation on the antibiotics, can effectively remove different types of antibiotics, has the advantages of high removal rate, quick removal, easy implementation, high safety, low cost, no secondary pollution and the like, in particular can achieve efficient removal of antibiotics in water and has a very good practical application prospect.

The invention relates to the fields of resource utilization of waste biomasses and preparation of biomass carbon materials, and discloses a method for preparing an electrode carbon material for an electrochemical capacitor from peanut shells. The method comprises the following steps: performing hydrothermal reaction process on the peanut shells to generate lightly carbonized lignite-shaped hydrothermal carbon, completely mixing the hydrothermal carbon and salt, and further performing carbonization and activation at high temperature to prepare a porous carbon material. The porous carbon prepared by the method is high in specific surface area and reasonable in pore diameter structure, and serves as an electrode active material of the electrochemical capacitor. The specific capacitance valuereaches 447 F / g under the current density of 0.2 A / g. After cylic test is conducted for 10000 times under high current density of 10 A / g, the retention rate of 90 percent still can be maintained and high cycling stability is achieved. Compared with a single molten salt activation method, the porous carbon material which is prepared by a hydrothermal-molten salt combination technology has the following advantages: the capacitance performance is obviously improved, and the technology provides a brand new and reliable resourceful treatment mode for high-additional-value utilization of biomasses.

The invention discloses a carbon nitride / nitrogen doped hollow mesoporous carbon / bismuth trioxide ternary Z-type photocatalyst, and a preparation method thereof. According to the preparation method, graphite phase carbon nitride is taken as a carrier, the surface of the carrier is modified with nitrogen doped hollow mesoporous carbon and bismuth trioxide. The preparation method comprises followingsteps: melamine, bismuth nitrate pentahydrate, and nitrogen doped hollow mesoporous carbon are dispersed in ethanol through ultrasonic dispersion, heating and continuous stirring are carried out until complete ethanol volatilization is achieved so as to obtain a photocatalyst precursor mixture; calcining is carried out so as to obtain the carbon nitride / nitrogen doped hollow mesoporous carbon / bismuth trioxide ternary Z-type photocatalyst. The carbon nitride / nitrogen doped hollow mesoporous carbon / bismuth trioxide ternary Z-type photocatalyst is excellent in light absorbing capacity, low in photo-induced electron-cavity recombination rate, excellent in photocatalysis performance, and high in stability, is a novel photocatalysis material. The preparation method is simple; the conditions areeasy to control; the cost is low; and the preparation method is suitable for large-scale industrialized production.

The invention belongs to the technical field of hydrogenation catalysts, and discloses a hydrogenation catalyst based on a carbon nanotube / alumina composite carrier, a preparation method and an application thereof. The aqueous dispersion of carboxylated carbon CNT is mixed with AlOOH sol, and the CNT-AlOOH sol mixture is wrapped with activated γ-Al 2 o 3 , dried and calcined at 350-600°C under an inert atmosphere to obtain CNT@γ‑Al 2 o 3 Carrier; dissolving the salts of non-precious metal A in ethylene glycol, or dissolving the salts or acids of noble metal B in HCl, respectively, with CNT@γ‑Al 2 o 3 Mix the carrier, adjust the pH value, add hydrazine hydrate and carry out the reduction reaction, cool, filter with suction, wash with water, and dry to obtain A / CNT@γ‑Al 2 o 3 or B / CNT@γ‑Al 2 o 3 hydrogenation catalyst. The method improves the utilization rate of the CNT, enhances the mechanical strength of the catalyst, and improves the activity of the hydrogenation reaction.

The invention provides a cathode plate and a preparation method thereof and a lithium ion battery. The cathode plate consists of a cathode current collector and a cathode active substance layer. The cathode active substance layer consists of a cathode active material, a conductive agent; a binder; and an additive. The additive of the cathode plate disclosed by the invention can coat the surface of the cathode active material well after catalytic polymerization under voltage, so that a layer of uniformly distributed protective film is formed, and thereby the objective of improving the electrochemical properties of lithium ion batteries is achieved.

The invention relates to a method for epitaxially preparing graphene and graphene devices by pretreating SiC substrates. It includes the steps of: performing hydrogen etching on the SiC substrate, and then performing oxidation treatment on the SiC substrate after hydrogen etching, at a temperature of 800-1300° C., and a treatment time of 15-120 minutes; The temperature of the substrate is raised to 1450-1700°C for graphene growth. The present invention passivates the surface of SiC through oxidation pretreatment, reduces the nucleation density of SiC substrate epitaxial growth graphene, thereby obtains the graphene material with larger size and better performance, and on this basis SiC epitaxial graphene The wafer undergoes deposition, photolithography, doping and integration procedures to prepare corresponding graphene devices.

The invention discloses a magnetic catalyst MnFe2O4-MIL-53(Al) composite as well as a preparation method and an application thereof. A prepared MOF (metal organic framework material) MIL-53(Al) is added to a metal salt precursor for synthesizing MnFe2O4, and the catalyst MnFe2O4-MIL-53(Al) composite is prepared with a sol-gel method. The prepared supported MnFe2O4-MIL-53(Al) composite has bulk morphology and nanoparticles MnFe2O4 uniformly distributed on MIL-53(Al). The catalyst MnFe2O4-MIL-53(Al) composite has excellent catalytic degradation capacity for refractory organic matters in the presence of PMS, has the degradation rate for rhodamine B up to 99% and is convenient to prepare and easy to recycle.

The invention discloses a method for synthesizing benzphenyl alcohol by catalytic hydrogenation of benzophenone. The method is as follows: the method adopts a supported multi-component catalyst and adds a protective agent in the reaction system; the supported The multi-component catalyst is Pd-Cu-Sn / C, the carrier is activated carbon, the active component is Pd, and the additives are Cu and Sn, wherein the loading of Pd is 1-10wt%, and the loading of Cu is 1-5wt %, the load of Sn is 1-5wt%; the protective agent is sodium acetate. The method of the invention can improve the conversion rate of benzophenone and the selectivity of benzhydryl alcohol.