92results about How to "Low conversion temperature" patented technology

The invention provides a magnetic bead process nucleic acid extraction and transformation kit, and a using method thereof. The kit includes a lysate, a protease K, a magnetic bead solution, a transforamtion reagent, a nucleic acid protection agent, a binding solution, a washing solution I, a washing solution II and an eluent. The using method of the kit includes the following steps: (1) lysis; (2)transformation; (3) layering; (4) binding; (5) primary washing; (6) secondary washing; (7) drying; and 8) elution. The kit and the using method thereby can complete the transformation while achievingautomatic extraction of nucleic acid from a sample. The sample is lysed, releases the nucleic acid, and then begins to transform, the nucleic acid is separated from proteins by the binding solution after the transformation is completed, the methylated nucleic acid is purified by a magnetic bead process, and a pre-denaturation step in subsequent qPCR detection of the sample is used to replace a previously omitted sulfo group removal step, so a purification process in the original nucleic acid extraction step is omitted in the entire extraction and transformation process.

The invention discloses a method for preparing titanium carbide micro powder. Titanium powder and sucrose with the mass ratio of 1 to 1.6:1 are mixed, milled with balls, dried, then carbonized in boiling oil, dried, removed with oil and ignited, and then an auto-igniting reaction happens and titanium carbide is produced. The method mainly utilizes the sucrose to cover titanium powder particles, then carbonization is carried out to generate carbon which is used for covering the titanium powder particles; the contact area between carbon and titanium is fairly large and a carbon layer is remained between the titanium powder particles and particles, therefore, during the auto-igniting reaction, the carbonized titanium powder is not easy to agglomerate and the technique process is simple and easy to be controlled.

The invention discloses Ce:YAG glass ceramic as well as a preparation method and an application thereof. The Ce:YAG glass ceramic is prepared by active ingredients SiO2, B2O3, PbO, ZnO and Ce: YAG fluorescent powder, and on the basis of the SiO2, B2O3, PbO and ZnO, the content of each active ingredient is as follows (by molar fraction or mass fraction): 2 to 20 percent of SiO2, 10 to 35 percent of B2O3, 20 to 50 percent of PbO, 5 to 15 percent of ZnO and 2 to 10 percent of Ce:YAG fluorescent powder. According to the prepared Ce: YAG glass ceramic, the Ce: YAG microcrystal particles are uniformly distributed in the glass, so that the Ce:YAG glass ceramic has advantages of high transparency, low cost, excellent optical performance and the like. The invention also provides an application of the Ce:YAG glass ceramic in preparing a white-light LED (light emitting diode) device. By adopting the Ce:YAG glass ceramic, the sealing structure of the white-light LED device can be optimized, the process is simplified, and the lighting effect is improved.

The invention relates to a preparation method and applications of a monolithic catalyst used for catalyzing and purifying ammonia-containing waste gas. The monolithic catalyst consists of two parts, namely a honeycomb-shaped metal wiremesh carrier and a catalytic active component, wherein the honeycomb-shaped metal wiremesh carrier material is a FeCrAl stainless steel wiremesh; and the catalytic active component consists of a metal active component and an inorganic oxide carrier; the metal active component is one or more of Ag, Cu, Fe and Mn; and the inorganic oxide carrier is one or more of Al2O3, TiO2, SiO2, ZrO2 and CeO2. The monolithic catalyst has a three-dimensional permeating structure and properties such as higher heat transfer coefficient and mass transfer coefficient and lower pressure drop, is suitable for the installations of various reactors and can be directly applied in the industrial field. For example, the Ag/Al2O3 honeycomb-shaped metal wiremesh catalyst can be used for completely converting NH3 at 220 DEG C and have higher selectivity to N2 (>80%); and the catalyst has high stability and wide operating temperature window and is insensitive to the change of space velocity.

The present invention relates to a preparation method of a monolithic BEA molecular sieve catalyst for direct N2O catalysis decomposition. According to the monolithic BEA molecular sieve catalyst, cordierite is adopted as a carrier, a Fe and Co metal ion modified BEA molecular sieve is adopted as an active component, and a silica sol and an alumina sol are adopted to load the modified BEA molecular sieve on the cordierite to prepare the monolithic catalyst, wherein a ratio of the silica sol to the alumina sol is adjusted and the silica sol, the alumina sol and the modified molecular sieve are subjected to the optimal activity matching during the preparation process so as to prepare the high activity monolithic catalyst. Research results show that under reaction conditions of an airspeed of 4000 hour<-1> and a ratio of He to N2O of 65:35, the monolithic catalyst formed by matching the Co-BEA and 5% silica sol has the optimal activity, and the monolithic catalyst formed by matching the Fe-BEA and 5% alumina sol has the inferior activity. The monolithic BEA molecular sieve catalyst prepared by the preparation method has good catalytic activity and thermal stability, wherein a N2O conversion rate is 100% at a temperature of 500 DEG C.

The invention relates to a Pd/MIL-53(Al) catalyst, preparation and application thereof. The preparation method includes: letting terephthalic acid, aluminum nitrate and deionized water in a mass ratio of 1:5:20-30 react, conducting natural cooling to room temperature, and carrying out filtering and drying to obtain MIL-53(Al); and performing roasting to obtain a high specific surface area carrier, adding palladium nitrate, and conducting equivalent-volume impregnation to obtain a mixed solution, carrying out drying, and introducing Ar/H2 (0.1-0.2L/min) to conduct reduction activation so as to obtain the Pd/MIL-53(Al) catalyst. The loading capacity of palladium is 1-8wt%; the structural formula of MIL-53(Al) is [Al(OH)(O2C-C6H4-CO2)]. The catalyst is suitable for catalytic elimination of CO in catalytic cracking catalyst regeneration device discharged flue gas and motor vehicle exhaust, and has the advantages of large specific surface area, uniform distribution of active components, high catalytic activity, high thermal stability, easy synthesis, reduction of CO catalytic conversion temperature, and low consumption of precious metals.

The invention relates to a preparation method for a cerium-zirconium-palladium nanopowder catalyst. The preparation method comprises the following steps: dissolving a cerium source and a zirconium source in absolute ethanol, and adding P123 template agent to obtain sol; adding palladium nitrate; keeping constant temperature of 35DEG C and constant relative humidity of 40 percent, and performing evaporation induction to form gel; drying at the temperature of 100DEG C; calcining at the temperature of 400DEG C for 4 hours at the temperature rise rate of 1DEG C per minute; and ensuring that the atomic mole ration of cerium to zirconium is 8:2, the palladium loading quantity is 0.1 to 5 weight percent, and a ratio of the cerium source and the zirconium source to the absolute ethanol to the P123 is 10mmol:20ml:1g. The catalyst is suitable for catalytic elimination of CO in flue gas discharged by a catalytic cracking catalyst regeneration device and Co in tail gas of motor vehicles and has the advantages of large specific surface area, uniform distribution of noble metal active ingredients, high catalytic activity and thermal stability, and simple synthesis method; the temperature for complete catalytic conversion of CO can be greatly reduced; the consumption of noble metals is reduced; and the cost of the catalyst is reduced.

The invention discloses a method for preparing porous nanometer graphite and belongs to the field of research on nanometer carbon materials. The method comprises the following main steps: preparing a water-soluble carbon source as a raw material, an auxiliary agent and iron salts according to an appropriate ratio into a solution and heating; evaporating, concentrating and reacting the solution to obtain carbon-containing precursor powder, reacting the precursor for 0.5-5 hours at 600-1300 DEG C under a certain atmosphere to obtain a reaction product, and washing the reaction product with acid to obtain porous nanometer graphite. The method is simple in operation and low in cost and is conductive to industrial production; the obtained product is high in degree of graphitization, has a porous structure and can be widely applied in such fields as lithium ion cells, field emission materials and super capacitors.

The invention provides a low temperature glass phosphor, comprising a low temperature glass material and a fluorescent powder, wherein the low temperature glass material is composed of silica (SiO2), alumina (Al2O3) and sodium oxide (Na2O) of a soda glass system, or is composed of phosphoric pentoxide (P2O5), tin oxide (SnO) and barium oxide (BaO) of a phosphatic glass system. The invention further provides a method for preparing the low temperature glass phosphor, comprising: a penetrated low temperature sintering step, a water quenching forming step, a grinding step, a mixing pre-burning step, a mixing grinding step and a hot pressing forming step. The low temperature glass phosphor can reduces glass conversion temperature, glass softening temperature and glass initial crystallization temperature, and can form optical glass according with a grade requirement for a white light LED module.

The invention relates to a method for preparing aromatic hydrocarbons by methane-plasma-activated oxygen-free aromatization. The method comprises a multistage-series plasma activation reactor, an aromatization reactor, a palladium hydrogen permeation membrane separator, a condensation cooler, a heat recovery device and a gas-liquid separator. Unconverted methane in the reaction system is recycled; hydrogen permeated by the palladium hydrogen permeation membrane separator is recovered through a hydrogen vacuum pump; the unpermeated ethane, acetylene, propane, butane and aromatic hydrocarbons pass through the condenser and gas-liquid separator to recover the liquid aromatic hydrocarbons; and uncondensed ethane, acetylene, propane, butane and methane are merged and return to the reaction system. The method can recover the coproduct hydrogen; the plasma is adopted to activate and induce the reaction, thereby enhancing the methane conversion rate and promoting the generation of small-molecular paraffin hydrocarbons in the reaction system; and the paraffin hydrocarbons can be recycled as a methane reaction aid and a free radical chain initiator, thereby greatly enhancing the methane aromatization selectivity and yield, reducing the carbon deposit and lowering the production cost of aromatic hydrocarbons.

The invention relates to variable-scale CeO2 and CuO composite mesoporous spheres with high specific surface area and a preparation method of the composite mesoporous spheres. The composite mesoporousspheres have low-temperature and high-efficiency catalytic oxidation activity on CO. The preparation method of the CeO2/CuO composite mesoporous spheres comprise steps as follows: (1) firstly, variable-scale CeO2 mesoporous spheres are obtained by adopting Ce(NO3)3 as a Ce source in a C2H6O2 solution and regulating the water content; (2) the CeO2/CuO composite mesoporous spheres are obtained fromCu(NO3)2 as a Cu source, Na2CO3 as a pH regulator and the variable-scale CeO2 mesoporous spheres as carriers with a precipitation-deposition-calcination method. The method has the advantages of beingsimple in process, easy to operate, low in cost and the like; the mesoporous spheres are very suitable for industrial large-scale production and preparation. The obtained CeO2 and CuO composite mesoporous spheres have the advantages that the scale can be effectively regulated in the range of 30-150 nm, and the specific surface area is 100-200 m<2>/g, have the characteristics of being low in complete conversion temperature for catalytic oxidation of CO, high in efficiency, long in service life and the like, and have significant application value in catalytic oxidation of CO, purification of automobile exhaust gas and industrial exhaust gas and the like in the future.

The invention relates to a ZSM-5 zeolite catalyst for preparing propylene from methanol (MTP), a preparation method and a regeneration method thereof. In the preparation method, commercially available ZSM-5 zeolite powder is utilized as a base material, wherein, the framework Si-Al mol ratio is more than 300, and the crystal size is 200-800nm; and aluminum sol is adopted for modification at a certain temperature so as to adjust the property of solid acid of ZSM-5 zeolite to adapt to MTP catalytic reaction. By means of the methods, the catalyst has the advantages of greatly improved stability,greatly improved single-pass life up to over 1000 hours, greatly improved renewability and excellent property on the premise of keeping high propylene selectivity of the ZSM-5 zeolite with high Si-Almol ratio, wherein, the catalyst can be regenerated for more than 7 times; and industrial crude methanol with mass concentration of 90% is utilized as a reacting raw material.

The invention discloses a method and a device for preparing aromatic hydrocarbons from syngas. The preparation method comprises the following steps: a first reaction zone is filled with a catalyst, and the syngas is converted into olefin-based hydrocarbons at a high temperature; and a second reaction zone is filled with another catalyst, benzene/toluene is introduced, and the olefins undergo alkylation reaction at a low temperature in the presence of a large amount of hydrogen and CO2 to make the olefins highly selectively converted into the aromatic hydrocarbons. The preparation method has the characteristics of high conversion rate of the raw material, high yield of the aromatic hydrocarbons, low olefin content and easy separation of outlet gas, low cost, and easiness in amplification. The invention also provides the device for realizing the preparation method.

A process for preparing cerium lanthanum oxide nanoparticles used to treat VOCs features the azeotropic distillation of metallic nitrate, high-molecular surface modifier and n-butanol. It has high catalytic performance.

The invention provides a preparation method and application of a Pd/modified bauxite catalyst. The preparation method comprises the following steps: carrying out hydrothermal treatment on natural bauxite at the temperature of 130-170 DEG C for 48-72 h, then drying at the temperature of 80-110 DEG C for 4 h, and roasting for 2-4 h at the temperature of 550-650 DEG C to obtain a modified bauxite carrier; at room temperature, dipping the modified bauxite carrier in H2PdCl4 solution (0.03 g/ml) with volumetric method, drying with an infrared lamp, and roasting for 2-6 h at the temperature of 450 DEG C to obtain the Pd/modified bauxite catalyst with different Pd loadings. According to the invention, the Pd/modified bauxite catalyst is used as the catalyst of a CO oxidation reaction, so that the invention has creativity. The preparation process is simple without discharging of waste water, and the catalyst can be synthesized in a great lot. The catalyst is applied in the CO oxidation reaction with low load capacity and high catalytic activity. The preparation method can greatly reduce production cost. The invention has a good application prospect.