34results about How to "Total pore volume" patented technology

The invention discloses a two-step activation preparation method of activated carbon and application thereof in a supercapacitor. The method comprises the following steps that blind coal is smashed and sieved, and an additive and a binder are added to be stirred; the mixture is added into a muffle furnace to be carbonized and then, shifted into a tubular activating oven, activated gas is introduced to be activated; diluted hydrochloric acid is used for acid pickling, filtering is performed, then, distilled water is used for washing, and a KOH solution is used for dipping; one-time activated carbon is placed into the activating oven, and protective gas is introduced to be activated; diluted hydrochloric acid is used for acid pickling, filtering is performed, then, distilled water is used for washing till pH is 7, and then drying is performed; reactivated de-ashing activated carbon is uniformly mixed with ethylene and polytetrafluoroethylene after being ground, the mixture coats foamed nickel, and after drying is performed, tabletting is performed to prepare the supercapacitor. Blind coal is adopted as a raw material, reaction conditions are mild, on the basis of the conventional activated carbon production technology, reactivation and de-ashing are performed, the synthesis cost is greatly lowered, and the huge application and popularization potential is achieved in the field of activated carbon for the high-performance supercapacitor.

The invention discloses a method for preparing a cerium oxide-zirconium oxide based composite rare-earth oxide. The method comprises the following steps of: (1) heating a zirconium salt solution at room temperature, slowly adding sulfate ions, controlling the temperature rise rate so that the temperature is increased in the range of 90-95 DEG C when the sulfate ions are added completely, and then preserving heat for 20-100 minutes, thereby forming a zirconium basic sulfate composite salt precursor; (2) adding a cerium salt and a rare-earth metal salt to the precursor solution and stirring evenly, thereby obtaining a slurry; (3) settling the slurry by using basic carbonate and/or a basic oxalate solution, thereby obtaining a precipitate; and (4) filtering and washing the precipitate obtained in the step (3), removing purities, and calcining the washed precipitate. The cerium oxide-zirconium oxide based composite rare-earth oxide prepared by the method by controlling raw materials and process conditions has the characteristics of being high in total fine pore volume, high in fresh specific surface area, high in oxygen storage capacity and the like.

The invention relates to a nitrogen controlling material prepared based on lake sediment, a preparation method and application thereof. The preparation method includes: collecting lake sediment as the raw material, conducting freeze drying, grinding and sieving, then carrying out high temperature roasting for certain time, and performing cooling so as to obtain the nitrogen controlling material. According to the invention, lake sediment is adopted as the raw material, and is subjected to heat treatment to prepare the nitrogen controlling material. The nitrogen controlling material comes from lake sediment, not only has low price, but also has high safety, has no ecological risk to lake water, also the high temperature roasted sediment has the characteristics of strong ammonia nitrogen adsorption capacity and weak desorption, thus solving the problems of high cost of ammonia nitrogen controlled release materials, poor ecological safety and limited ammonia nitrogen controlled release effect in the prior art.

The invention provides a semicoke-based activated carbon adsorption material as well as a preparation method and application thereof. Reaction raw materials of the semicoke-based activated carbon adsorption material comprise semicoke powder, a potassium hydroxide solution and carbon dioxide gas, and the carbon dioxide gas is used as an activating agent. The preparation method of the semicoke-basedactivated carbon adsorption material comprises the following steps: step 1, providing the semicoke powder; 2, adding the semicoke powder into the potassium hydroxide solution, impregnating at normaltemperature to obtain a sample, drying the sample, and carrying out sealed storage to obtain impregnated semicoke; and 3, heating the impregnated semicoke, activating the semicoke by using the carbondioxide gas as the activator, drying the activated semicoke-based activated carbon adsorption material in vacuum, and carrying out sealed storage. When the semicoke-based activated carbon adsorption material is applied to organic sulfur waste gas such as methyl mercaptan and carbonyl sulfide, the removal efficiency of organic sulfur can be effectively improved.

The invention provides a method for in situ synthesis of a NaY molecular sieve rich in meso-pores. The method comprises the following steps: mixing kaolin with Na2CO3, calcining the obtained mixture at 300-1200 DEG C under a nitrogen condition for 2-15 h to obtain an aluminum source, adding a silicon source, sodium hydroxide, water and a directing agent, and performing uniform mixing at room temperature to obtain a NaY molecular sieve synthesis solution, wherein a molar ratio of Na2O:Al2O3:SiO2:H2O in the synthesis solution system is (3-15):(1-5):(5-25):(80-380); and ageing the synthesis solution at room temperature for 0-5 h, heating the aged synthesis solution to 80-120 DEG C, crystallizing the synthesis solution for 16-60 h, and performing suction filtration, washing and drying on the obtained solid product after the crystallization ends in order to synthesize the NaY molecular sieve rich in meso-pores. The molecular sieve obtained through the method has a larger total pore volume,a larger meso-pore volume and a larger average pore diameter than conventional NaY molecular sieves, and also has the advantages of high pore permeability, long active period. strong resistance to heavy metal pollution, and broad application prospect in the petrochemical field.

The invention discloses a method for preparing high-temperature resistant anti-corrosion ablation microfiber, and belongs to the technical field of high-temperature filtration and ablation material preparation. The method comprises the following steps: 1, performing thermal acid leaching, namely, artificially crushing alkali-free glass fiber cotton of which the single fiber diameter is less than 1 [mu] m, soaking into a 2.5 mol/L acid solution, and stirring in two directions at a speed of 30-300 rpm; 2, performing water washing percolation, namely, firstly, washing a great amount of an acid liquid, adsorbed in the fiber cotton, with cold water, further washing with hot water and cold water respectively, testing acid residues on the surface of the fiber cotton by using extensive pH indicator paper of which the pH value is 1-14, and till the pH value is greater than 5, stopping washing; and 3, performing thermal treatment, drying the fiber cotton washed with water, and determining whether sintering is implemented or not according to application situations. The high-temperature resistant anti-corrosion ablation microfiber is high in high temperature resistance, high in corrosion resistance, rich in porous texture, excellent in separation and filtration effect, high in technical level, high in ablation property, low in cost and relatively good in prospect in market application.

The invention discloses a preparation method of a chemically grafted and modified biomass adsorbent, relates to a preparation method of a biomass adsorbent, and aims at solving the problem that an existing cellulose-rich biomass adsorbent is relatively weak in metal ion adsorption capacity. The preparation method comprises the following steps: 1, carrying out pyrolysis treatment on a biomass material by adopting an oxygen-limited heating carbonization method to obtain carbonized biomass; 2, adding the carbonized biomass into a trichloromethane solution of pyridine, dropwise adding 4-bromobutyryl chloride, sealing the reaction mixed solution, and carrying out an oscillation reaction; and 3, mixing polyethyleneimine, KOH and tert-amyl alcohol to obtain a mixed modified solution, immersing the cleaned biomass into the mixed modified solution, and carrying out an oscillation reaction at a temperature of 70-80 DEG C to obtain the chemically grafted and modified biomass adsorbent. The novelefficient environment-friendly modified biomass adsorbent is prepared through carbonization and graft copolymerization modification by utilizing a method of combining physical activation and chemicalactivation.

The invention relates to a super capacitor-used composite material and a preparation method thereof. With coal as a raw material, a coal sample is crushed and screened to powder with a certain particle size, temperature of the powder rises to 600 to 800 DEG C at a temperature rise rate of 25 to 35 DEG C/min, carbonization is then carried out to obtain a carbonized material, temperature of the carbonized material rises to 800 to 1100 DEG C at a temperature rise rate of 25 to 35 DEG C/min, an activated gas is fed, 3 to 5 h of activation is carried out, and cooling to room temperature is carried out; after the material is washed by water for 3 to 6 times, acid cleaning is firstly carried out, and distilled water is then used for washing until PH is near to 7; and in a certain condition, drying to a constant weight is carried out, and an activated carbon composite material is obtained. The activated carbon material prepared in the invention is an electrode material, the activated carbon material has a large specific surface area, large total pore volume and high mesopore ratio, the specific capacitance and the charge and discharge cycle performance of the super capacitor are improved, and requirements on the high specific capacitance and the excellent large current performance by the super capacitor are met.

The invention provides a zinc-modified hierarchical pore ZSM-5 nano-zeolite. ZSM-5 nano-zeolite has a hierarchical pore structure internally, and zinc particles are coated inside the ZSM-5 nano-zeolite. The invention also provides a preparation method of the catalyst. The method includes: mixing nano-ZSM-5 zeolite with a sodium hydroxide aqueous solution to obtain hierarchical pore ZSM-5 nano-zeolite, subjecting the hierarchical pore ZSM-5 nano-zeolite to ammonium exchange, conducting zinc impregnation, then utilizing silica sol for strip extrusion, and then conducting dry gel conversion, thusobtaining the zinc-modified hierarchical pore ZSM-5 nano-zeolite. The zinc-modified hierarchical pore ZSM-5 nano-zeolite provided by the invention has a hierarchical pore structure, and the zinc particles are coated inside the ZSM-5 nano-zeolite, thus solving the problems of narrow pore channel and easy inactivation of traditional zinc-modified ZSM-5 zeolite in methanol-to-aromatics reaction, andalso solving the problem of low aromatic hydrocarbon selectivity of zinc-modified mesoporous ZSM-5 zeolite.

The invention discloses a high-performance carbon negative electrode PTCDA hard carbon material and a preparation method thereof, a product can be prepared by solid-phase sintering of perylenetetracarboxylic dianhydride, i.e., a blocky carbon material is obtained by high-temperature sintering of a perylenetetracarboxylic dianhydride negative electrode material under an inert gas, and the perylenetetracarboxylic dianhydride is directly sintered into a carbon material, so that the used raw materials are simple, other doping materials, such as graphite, etc., are not needed, the industrial production cost is low, raw materials are easy to obtain, and the preparation method is simple, environment-friendly and non-toxic. The carbon material is obtained by directly sintering perylenetetracarboxylic dianhydride, the preparation process is low in sintering temperature, is easier to realize, is simple to control and is easier for industrial production, and the obtained PTCDA organic carbon shows good cycle performance and capacity property when being used as a negative electrode material of a lithium ion battery and has better cycle stability compared with the traditional graphite.

The invention discloses a modified Citrus reticulata cv. Suavissima peel biochar material and a preparation method and application thereof. The preparation method comprises: immersing Citrus reticulata cv. Suavissima peel powder in an aqueous solution of FeCl3, continuously conducting heating and stirring, performing magnetic modification, after the modification, separating a solid phase from thesolution and conducting drying to obtain magnetically modified Citrus reticulata cv. Suavissima peel biomass; and putting the magnetically modified Citrus reticulata cv. Suavissima peel biomass in anenvironment of 650-750 DEG C for pyrolysis to obtain the modified Citrus reticulata cv. Suavissima peel biochar material. The biochar material of the invention has a large specific surface area, totalpore volume, micropore volume and average pore diameter, and iron can be uniformly distributed on the biochar. In a static experiment, the removal rate is as high as 99.74%, and the maximum adsorption amount is 48.1 mg/g; and in a dynamic experiment, when the chromium concentration reaches 742.5 mg/L, the solution pH is 1.0, and in the first 40 min when the flow rate is 1 mL/min, the removal rateis as high as 99.91%, and the maximum adsorption amount is as high as 83.3 mg/g.

The invention belongs to the technical field of activated carbon preparation, and particularly relates to a method for preparing activated carbon by taking camellia oleifera shells as raw materials through a microwave chemical activation method. The method comprises the following steps of: 1, taking camellia oleifera fruits, and naturally airing, wherein after the first ten days of October, when the oil content of the tea oil fruits reaches the highest peak, the tea oil fruits are in a complete mature period, peel and fuzz of the tea oil fruits naturally fall off and begin to become smooth andbright through naked eye observation, and the tea oil fruits are collected after 10% of cracks and then placed in a ventilated place to be naturally aired till the water content is reduced to 10% orbelow; 2, shelling the camellia oleifera fruits, taking waste fruit shells, washing with water to remove impurities, drying, taking seeds from the dried camellia oleifera fruits, and collecting the waste gas fruit shells. According to the invention, the design is reasonable, and the prepared activated carbon has the advantages of large specific surface area, high total pore volume, developed finepore structure, high adsorption speed, high adsorption capacity and the like; and the waste camellia oleifera shells are used as raw materials to prepare the activated carbon, so that the source of raw materials for producing the activated carbon is expanded, the production cost is reduced, the raw materials are simple and easily available, and resource recycling is realized.