75results about How to "Facilitated Diffusion and Mass Transfer" patented technology

The invention relates to a method for improving the catalytic property of methane aromatization catalyst, belonging to the technical field of molecular sieve catalysis. The invention is characterized in that on the condition of no-second template, the crystal growth of zeolite molecular sieve is controlled by reasonablely controlling zeolite molecular sieve synthesis conditions such as synthesis formulation, charging sequence, ageing time, crystallization temperature, crystallization time and the like, small molecular sieve crystal is used for assembly and intergrowth to form MCM-22 and ZSM-5 molecular sieve assembly with multi-stage pore path structure, Mo or Re used can be adopted as active component to perform loading and modification to the prepared molecular sieve assembly, and the invention provides Mo-based MCM-22 and ZSM-5 molecular sieve assembly catalysts and an application thereof in methane non-oxidative aromatization reaction. The effects and the benefits of the invention is that the operation is simple, the cost is low and in methane non-oxidative aromatization reaction, the multi level structure assembly catalyst prepared by the method of the invention has better catalytic performance compared with the traditional catalyst.

The invention relates to a method for synthesizing a hierarchical pore zeolitic imidazolate framework 8 (ZIF-8) and application thereof in deep desulfurization of gasoline. The method comprises the following steps of: dissolving anionic surfactant into deionized water, adding an inorganic salt of zinc, adding 2-methylimidazole after the inorganic salt is dissolved, and mixing uniformly to obtain a sol-like substance; crystallizing the sol-like substance, and separating, washing and drying the solid product to obtain hierarchical pore ZIF-8 powder crystal; and extracting the anionic surfactant from the hierarchical pore ZIF-8 powder crystal by using a sodium hydroxide solution and an organic solvent as extracting agents, and thus obtaining the hierarchical pore ZIF-8. A preparation method for a corresponding deep desulfurization agent comprises the following steps of: preparing the hierarchical pore ZIF-8 according to the method for synthesizing the hierarchical pore ZIF-8; and dispersing the hierarchical pore ZIF-8 into an inorganic salt solution of copper, stirring, separating, washing and drying the solid product, roasting in a nitrogen atmosphere, and thus obtaining a copper-carrying hierarchical pore ZIF-8, namely the deep desulfurization agent.

The invention relates to a preparation method of a high-loading active substance electrode. According to the method, a pore-forming agent is added in the preparation process of electrode slurry, the electrode slurry is applied to an aluminum foil current collector through coating equipment in a blade coating manner, an electrode-current collector integrated electrode is formed, the pore-forming agent is decomposed by the heat and volatilized in a gas form in the drying process, so that the electrode structure has a fluffy state, and a large quantity of pore structures are formed. The high-loading electrode having a fluffy porous structure and prepared with the method can effectively promote diffusion and mass transfer of sodium ions in the electrode, and particularly, diffusion of sodium ions at a high rate is intensified. Through battery performance tests, the performance of a sodium ion battery assembled by the high-loading active substance electrodes prepared by use of the pore-forming agent is substantially improved, and the performance is notably improved at a high rate.

The invention belongs to the technical field of fuel cells and particularly relates to a medium-temperature proton exchange membrane fuel cell membrane electrode and a preparation method thereof. Themembrane electrode comprises an anode microporous layer, an anode catalyst layer, a proton exchange membrane, a cathode catalyst layer and a cathode microporous layer which are sequentially arranged,and the anode catalyst layer and the cathode catalyst layer respectively consist of a hydrophilic catalyst layer and a hydrophobic catalyst layer. KAPPA-carbon black is contained in the anode microporous layer and the cathode microporous layer, and Pt / C catalysts are contained in the anode catalyst layer and the cathode catalyst layer. A binder used in the invention can improve the conductivity and proton transmission capability of an electrode; a used pore-forming agent enables the catalyst layers to obtain more uniformly distributed pores, the electrode can obtain more transmission channels,the reaction active area of the catalysts is increased, the power performance of the fuel cell is improved, vacuum heat treatment is adopted, the structural compactness of the catalyst layers is enhanced, the failure rate of the catalysts is reduced, and the service life of the catalysts is prolonged.

A preparation method of a gas diffusion electrode for electrochemical treatment of SO2 comprises steps as follows: 1) powdery conductive carbon black is added to absolute ethyl alcohol until the carbon black is completely immersed, a polytetrafluoroethylene emulsion is added, the mixture is subjected to water bath treatment and stirred until clustered substances are formed, the clustered substances are rolled to form a film, and a diffusion layer film is obtained; 2) a stainless steel net current collector is covered with the diffusion layer film, rolling forming is performed, and the film is taken out for standby use after being calcined in a muffle furnace; 3) the powdery carbon black and a little quantity of carbon nanotubes are rolled to form a film with a method in the step 1), and a catalyst layer film is obtained; 4) the other side of the stainless steel net current collector is covered with the catalyst layer film, rolling forming is performed, and a target object is prepared. The preparation method has the advantages as follows: SO2 diffusion mass transfer is reinforced by increasing gas transferring pore channels of the electrode; a process is simple, the cost of raw materials is low, the mechanical strength of the prepared gas diffusion electrode is high, the reusability is good, the SO2 conversion efficiency is high, and the gas diffusion electrode is suitable for engineering application of electrochemical treatment of SO2.

The invention relates to preparation and an application of a high-loading active substance electrode. A method of solvent impregnating and freeze-drying is implemented, the solvent-impregnated high-loading electrode has a fluffy porous structure, and the stable fluffy porous structure is obtained through freeze-drying. The prepared high-loading electrode with the fluffy porous structure can effectively promotes diffusion and mass transfer of sodium ions in the electrode, and particularly, diffusion of sodium ions at a high rate is intensified. Through battery performance tests, the performanceof a sodium ion battery assembled by the prepared high-loading active substance electrodes is substantially improved, and the performance is notably improved at a high rate.

The invention discloses a multistage pore molecular sieve-supported heteropolyacid alkylation desulfurization catalyst and a preparation method thereof. A multistage pore molecular sieve prepared by acid-base compound treatment is taken as a carrier, and with the aid of microwaves, a supported heteropolyacid catalyst is subjected to in-situ synthesis through a hydrothermal dispersion method. A specific synthesis method of the catalyst comprises the following steps: firstly preparing the molecular sieve carrier with multistage pore channels by adopting acid-base hydro-thermal treatment and thenperforming in-situ synthesis on the supported heteropolyacid catalyst by adopting a hydrothermal dispersion method with the aid of the microwaves. Measured by 100 percent by weight of multistage poremolecular sieve, the catalyst comprises 5-40 percent by weight of heteropolyacid; in the multistage pore molecular sieve, the molar ratio of SiO2 to Al2O3 is 10:60; the specific surface area is 200-700 m<2> / g; the pore volume is 0.3-0.8 m<3> / g. The multistage pore molecular sieve-supported heteropolyacid catalyst disclosed by the invention has the characteristics of firm active component supporting and good reusability and has the advantages of high thiophene sulfide conversion rate, good stability and high selectivity and the like when being used in the gasoline sulfide alkylation conversionprocess especially.

The invention discloses a mesoporous carbon-loaded gold nano catalyst and application of the catalyst. A preparation method of the mesoporous carbon-loaded gold nano catalyst comprises the following steps of: (1) mixing SBA-15, gamma-aminopropyltriethoxysilane and ethanol, refluxing for 8-10h, filtering and drying to obtain amino-modified SBA-15; (2) mixing amino-modified SBA-15 with HAuCl4 aqueous solution, sufficiently stirring, and then adding KBH4 aqueous solution for reduction to obtain Au / SBA-15; and (3) uniformly mixing Au / SBA-15 obtained in the step (2) with phenolic resin ethanol solution, sufficiently immersing, carrying out primary drying, then transferring to a pipe furnace, carrying out high-temperature carbonization in nitrogen atmosphere at 600-900 DEG C, taking out obtained solid, and washing off the template SBA-15 to obtain the mesoporous carbon-loaded gold nano catalyst. The obtained mesoporous carbon-loaded gold nano catalyst can be used for hydrogenation reaction of nitrobenzene compounds, and has excellent reaction activity and selectivity.

The invention provides a bionic fiber functional material as well as a preparation method and application thereof. The material is rich in multiple adsorption sites (N, O and S); the material is obtained by blending a polyethyleneimine polymer modified by three multifunctional groups, carboxylated nano-cellulose and graphene oxide, performing a coaxial spinning method based on an imitated spider spinning principle, and performing a post-crosslinking technology; the material is of a multi-layer structure with nanocellulose as a framework, graphene oxide as an outer layer and polyethyleneimine polymers modified by three multifunctional groups respectively as an inner layer; and all the layers are connected through chemical bonds. The N, O and S adsorption site densities of the material are all higher than 5 mmol / g.

The invention relates to a preparation method of textured high-curie-point Pr2Ti2O7 ceramic. According to the technical scheme, the two-time plasma activation heat treatment technology is adopted. The method specifically includes the first step of primary plasma activation heat treatment and the second step of secondary plasma activation heat treatment. In the first step, a graphene die is filled with Pr2Ti2O7 raw materials and then moved into a plasma activated sintering furnace to be activated for 10-30 s, then the temperature is increased to 1100-1250 DEG C at the temperature rise speed of 50-100 DEG C / min, the temperature is kept for 1-3 min, pressure of 20-50 MPa is exerted, and a Pr2Ti2O7 ceramic block is obtained after dense sintering; in the second step, the Pr2Ti2O7 ceramic block is put into the center of a graphene die of a larger size and then moved into the plasma activated sintering furnace to be activated for 10-30 s, then the temperature is increased to 1200-1350 DEG C at the temperature rise speed of 50-100 DEG C / min, the temperature is kept for 3-5 min, pressure of 40-80 MPa is exerted, and the textured Pr2Ti2O7 ceramic is obtained after texturing. The defects that the existing texturing technology of hot forging, hot pressing and the like is long in thermal processing cycle, high in sintering temperature, low in production efficiency and the like are effectively overcome; the application requirement of the high-temperature piezoelectric field can be met through the prepared Pr2Ti2O7 ceramic.