168results about How to "Excellent stability" patented technology

A preparation method of graphene oxide/ silicon dioxide hybrid aerogel comprises the following steps: A, adding 0.05-0.1 mol of a precursor into 9-18 ml of distilled water and dropwise adding a hydrolyst with its concentration of 0.2-0.6 mol/L into the precursor aqueous solution, wherein molar ratio of the hydrolyst to the precursor is 1:20-1:100; stirring at 20-30 DEG C for 5-8 h; adjusting pH value to 6-7 and stirring for 5-45 min so as to obtain a dispersion containing silicon dioxide microspheres; B, adding water to dilute the silicon dioxide microsphere dispersion by 5-50 times, carrying out iso-volume mixing on the diluted silicon dioxide microsphere dispersion and a graphene oxide dispersion with its concentration being 0.6-2 mg/ml, stirring for 10-30 min, carrying out ultrasonic treatment for 10-30 min so as to obtain graphene oxide/silicon dioxide hybrid aerogel; and C, freezing the hybrid aerogel under liquid nitrogen for 5-10 min, freeze-drying and dewatering to obtain the graphene oxide/silicon dioxide hybrid aerogel. The method is environmentally friendly, and the technology is simple. The prepared hybrid aerogel has advantages of complete gel network structure, high porosity, good adsorptivity, high strength, low density and the like.

The invention discloses a self-adapting current multiplication circuit and a low-dropout-voltage linear voltage regulator integrating the circuit. Firstly, constant bias voltage of an NMOS transistor and constant bias voltage of a PMOS transistor are generated through a constant bias voltage generating circuit, and then a lagging current comparator collects small part of load current which is compared with constant current; when a load is in a light load, the lagging current comparator shuts off a self-adapting current multiplication generating circuit, self-adapting current multiplication voltage VBPA rises, the bias current of an operational amplifier of the low-dropout-voltage linear voltage regulator lowers, in this way, stability is guaranteed, and quiescent dissipation is reduced; when the load is in a heavy load from a moderate load, the lagging current comparator turns on the self-adapting current multiplication generating circuit, the self-adapting current multiplication voltage VBPA lowers, the bias current of the operational amplifier increases to the specific times the bias current of the operational amplifier during the light load, the gain bandwidth product of the low-dropout-voltage linear voltage regulator increases, and transient response performance is enhanced.

The invention discloses a multi-metal MOFs derived oxygen reduction/oxygen evolution double-function catalytic material, and a preparation method thereof. The preparation method comprises following steps: room temperature coprecipitation is adopted to synthesis a Zn/Co/Fe multi-metal ZIF precursor; then sulfuration and sintering treatment technology is adopted for combination of oxygen reduction reaction (ORR) active sites (Co/Fe-N-C) and oxygen evolution reaction (OER) active sites (Co/Fe-S) on a monomer material, so that the double ORR/OER electrocatalyst which is low in cost and possesses the performance as good as that of commercially available catalysts is obtained. According to the preparation method, two important factors, including active site distribution and catalytic mechanism,with great influences on material performance are taken into comprehensive consideration, realization of the optimal material catalytic oxidation reduction/oxygen evolution reaction efficiency is taken as a design principle, optimization design is adopted to obtain the best Zn/Co/Fe ratio in the precursor, and the catalyst is provided with the best catalytic performance. The multi-metal MOFs derived oxygen reduction/oxygen evolution double-function catalytic material possesses both high efficiency oxygen reduction and oxygen evolution performance, is high in specific surface area, is abundantin micropores, and is uniform in active site dispersion; and the cost is much lower than that of commercially available precious metal catalyst catalytic materials.

The invention discloses a low-power-consumption whole vehicle controller integrated with a gateway function. The low-power-consumption whole vehicle controller comprises a main control unit, a gatewaycommunication processing unit, an advanced power management unit, an input signal processing unit, an output processing unit, a system storage unit and a breakdown processing unit. A power supply unit supplies electricity to a storage battery, electricity is supplied to a system and a circuit on the periphery of the system by outputting stable voltage through the power supply unit, and normal working of the system is ensured. The main control unit is in data connection with the input signal processing unit, the output processing unit, the storage unit, a breakdown diagnosis unit and the gateway communication unit through a high-speed SPI communication interface, an AD port and a CAN interface, and network information interconnection of a whole vehicle CAN bus is achieved. The low-power-consumption whole vehicle controller can be applied to the situation that a main control unit with pure electric and hybrid vehicle models serving as wholes vehicles coordinates all sub-controllers to work, the new energy whole vehicle controller function is achieved functionally, the gateway function is also achieved, the number of vehicle body electronic controllers is reduced, and the vehicle body space is effectively utilized.

The invention discloses a target tracking method for modeling by integrating a description method and a discriminant method, which comprises the following steps: 1, t=1, randomly extracting a multiscale small image block set from a tracked object and neighboring backgrounds of the tracked object in a first frame image and training a pair of support vector machines in a second category and a pair of support vector machines in a first category serving as a model of the tracked object; 2, randomly extracting a multiscale small image block set in a t+1 frame image and determining degree of confidence that the small image block set in the t+1 frame image belongs to the tracked object through the model of the tracked object, and constructing a confidence image by using the degree of confidence of a small image block in a new frame image and central coordinates of the small image block; acquiring a new position of the tracked object in the new frame image by using a mean shift algorithm on the confidence image; classifying the small blocks in the current frame according to the degree of confidence of the image block and the new position of the tracked object, and updating the model of the tracked object according to the classification result; 3, if not reaching the last frame of a video file, increasing t and returning to the step2; and 4, stopping.

The invention discloses a diesel vehicle exhaust purification SCR (Selective Catalytic Reduction) catalyst. The catalyst comprises a cordierite honeycomb ceramic carrier and a coating which is loaded on the cordierite honeycomb ceramic carrier; the coating comprises the following raw materials: titanium dioxide/silicon dioxide composite oxide powder, ammonium tungstate and ammonium metavanadate according to a mass ratio of 100:(12-18):(3-6). A preparation method of the catalyst comprises the steps of mixing the ammonium tungstate with the titanium dioxide/silicon dioxide composite oxide powder firstly to prepare TiO2-SiO2/WO3 pccowder, then mixing the ammonium metavanadate with TiO2-SiO2/WO3 to prepare slurry to be coated, and then coating the cordierite honeycomb ceramic carrier with the slurry to be coated by using an impregnation method. The catalyst is wide in activity temperature window, high in high-temperature activity and water/heat resistant stability, and good in reproducibility.

The invention discloses a composite material based on modified hollow glass microspheres. The composite material is prepared from the following raw materials: a resin matrix and the modified hollow glass microspheres. The preparation method of the modified hollow glass microsphere comprises the following steps: carrying out acid leaching treatment on the hollow glass microsphere; and carrying outsurface heat treatment or surface coupling treatment on the hollow glass microspheres subjected to acid leaching treatment to obtain the modified hollow glass microspheres. The composite material hasexcellent mechanical properties and stability. The invention also discloses a preparation method of the composite material.

An electric catalyst used for proton exchange membrane fuel cells, active component is Pt or PtRu, auxiliary component is titanium oxide; the atom ratio of platinum and titanium is 0.01-99, the atom ratio of platinum and ruthenium is 0.01-99, the particle size of the active component is 1-20nm. The active component can be impregnated in the titanium oxide modified porous conductive material, gained support-type electric catalyst, which contained activity group sharing percentage for the quality of 1-99%, the atom ratio of platinum and titanium is 0.01-99. Active components can be added as a percentage of 0-99% of the auxiliary components, become a multi-component catalysts; adding auxiliary components was transition metal or a transition metal oxides or several. Preparation methods can be used colloidal law or impregnation - Reduction Act. The invention of the electric catalyst can be used in proton exchange membrane fuel cells.

The invention discloses a catalyst for preparing light aromatic hydrocarbon by synthetic gas one-step process, and a preparation method and an application thereof. The catalyst comprises a Fischer-Tropsch synthesis catalyst and an aromatization catalyst, wherein the Fischer-Tropsch synthesis catalyst includes an oxide of Fe and an oxide of Mn, and a composite metal oxide can fully improve the high-temperature Fischer-Tropsch synthesis activity; the aromatization catalyst is a modified molecular sieve with HZSM-5 as a carrier and with Mo and Ni double metals as active components, and the aromatization performance can be significantly improved. Through the combination of the two catalysts, series coupling of a Fischer-Tropsch synthesis reaction and an aromatization reaction is achieved, a one-way conversion rate of CO is increased obviously, and at the same time, a technology route for preparing light aromatic hydrocarbon-benzene, toluene and xylene (BTX) by synthetic gas one-step process is exploited. Experiments verify that the conversion rate of CO reaches up to 98% or more, the selectivity of hydrocarbonyl of aromatic hydrocarbon reaches 73% or more, and the selectivity of hydrocarbyl of BTX reaches 53%. The catalyst for preparing aromatic hydrocarbon by the synthetic gas one-step process has the advantages of relatively good catalytic activity, good stability and simple preparation, and has relatively good industrial application prospects.

The invention provides a data recommendation method based on citation network community discovery, and the method comprises the following steps: constructing a citation network based on the cooperation relation between authors and the co-citation and coupling relation between papers; for the citation network, discovering a community network with similar or related research contents by utilizing amodular Louvain algorithm; based on the similarity between the paper and the data set, establishing association between the data set and the community network; and superposing and de-duplicating the paper nodes in the community network associated with the data set, and then performing data recommendation.

The invention relates to a nickel iron bimetallic methanation catalyst and preparation and application thereof; according to the ratio of 0.7-1ml of a soluble salt solution to 1g of an alumina carrier, the prepared soluble salt solution is immersed on the carrier; according to the ratio of 0.7-1ml of a soluble nickel salt solution to 1g of an additive-containing carrier, the soluble nickel salt solution is immersed on the carrier to obtain a nickel containing carrier; according to the ratio of 0.7-1ml of a soluble iron salt solution to 1g of the nickel containing carrier, the soluble iron salt solution is immersed on the nickel containing carrier for drying and roasting to obtain the catalyst; nickel oxide is 2.5-10wt%; iron oxide is 2.5-10wt%; an additive is 0.01-5wt%; the additive is at least one substance from lanthanum, cerium, barium and magnesium; the catalyst greatly improves low temperature methanation activity of the catalyst, decreases the cost of the catalyst, improves methane selectivity of the catalyst, and increases the stability of the catalyst.

The invention provides a preparation method of sulfhydryl anchoring platinum and platinum-gold / carbon nano-tube catalyst, belonging to fuel cell technical field. The method comprises following steps: reacting hydroxylation carbon nano-tube successively with reagent containing halogen and hydrosulphide to prepare sulfhydryl carbon nano-tube; reflowing the sulfhydryl carbon nano-tube and platinum salts in polyatomic alcohol, processing in hydrogen atmpsphere to obtain sulfhydryl anchoring platinum / carbon nano-tube catalyst; reflowing the sulfhydryl carbon nano-tube successively with the hydrochloroauric acid and the platinum salts in polyatomic alcohol, processing in hydrogen atmpsphere to obtain sulfhydryl anchoring platinum-gold / carbon nano-tube catalyst. The sulfhydryl anchoring platinum and platinum-gold / carbon nano-tube catalyst prepared by the invention has good stability and catalytic performance, can effectively settle the technical problems that the catalyst surface area is lowered and the activity is declined caused by surface migration and agglomeration growth on carbon carrier of platinum nanometer particles, and can also replace homogeneous commercialized catalyst.

The invention discloses a highly-effective copper-based catalyst for decomposing methanol to produce hydrogen. The highly-effective copper-based catalyst is a mixture of, based on the weight, 10-60% of CuO, 10-60% of ZnO, 5-50% of Al2O3 and 1-10% of MxOY, wherein alkaline-earth metal M is selected from one of Mg, Ca, Ce and Sr. An adopted preparation method comprises the following steps: (1) modifying alumina carriers by adding the alkaline-earth metal to prepare Al-M modified carriers; (2) adding low-molecular alcohol into mother liquid of the modified carriers, then adding active-metal saltsolution and an alkaline precipitation agent to carry out precipitating reaction, carrying out solid-liquid separation, washing, drying and roasting after the reaction is ended to prepare the catalyst. The highly-effectively copper-based catalyst prepared by the preparation method not only is high in catalytic activity, wide in reaction temperature area and good in low-temperature activity, but also is good in selectivity, fewer in side product and long in service life.