70results about How to "Improve anti-toxic performance" patented technology

The invention relates to a nano carbon doped electrocatalyst for a fuel cell, and application of the nano carbon doped electrocatalyst. The electrocatalyst is prepared by adopting the steps of: complexing a nitrogen-containing and/or boron-containing organic precursor and a transition metal salt to form a composite; adding nano carbon as a carrier, and heating and reacting a mixture by adopting a microwave radiation method; and after the reaction is complete, filtering and drying, placing a product obtained after the reaction in an inert atmosphere and/or reducing atmosphere, and treating at a high temperature of 500-1500 DEG C to obtain the nano carbon doped electrocatalyst. The nano carbon doped electrocatalyst is very low in cost, high in activity and stability and excellent in anti-poisoning capacity.

The invention discloses a high-firmness honeycomb ceramic carrier and a preparation method thereof. Cordierite honeycomb ceramic is used as a base body; an aluminum oxide coating layer and a composite coating layer are arranged on the surface of the base body in sequence; by the total weight of the honeycomb ceramic carrier, the honeycomb ceramic carrier contains 85-95 percent of cordierite honeycomb ceramic, 2-7 percent of the aluminum oxide coating layer and 3-8 percent of the composite coating layer; by the total weight of the composite coating layer, the composite coating layer contains 40-80 percent of titanium dioxide, 5-35 percent of silicon dioxide, 1-10 percent of aluminum oxide and 10-40 percent of an auxiliary. The preparation method comprises the following steps: (1) immersing the cordierite honeycomb ceramic base body subjected to acid treatment into alumina sol for treatment, taking out the cordierite honeycomb ceramic base body, blowing away residual liquid, and drying and roasting to obtain the cordierite honeycomb ceramic base body loaded with the aluminum oxide coating layer; (2) soaking the carrier obtained by the step (1) in composite coating layer slurry for treatment, taking out the carrier, blowing away the residual liquid, and drying and roasting to obtain a final product. The coating layer load of the honeycomb ceramic carrier is large, the firmness is high, and the preparation technology is simple; the mechanical strength of the base body is not damaged; the high-firmness honeycomb ceramic carrier is suitable for industrial application.

The invention discloses a methanation catalyst of carbon oxides containing nickel, the methanation catalyst contains active components of a) nickel oxide, b) tungsten oxide and/or molybdenum oxide, and c) at least one active component which is selected from alkali metal oxides, alkaline earth metal oxides and rare earth metal oxides which are loaded on a carrier of the oxides, and the carrier of the oxides is aluminium oxide, silicon oxide, titanium oxide, zirconium oxide or the mixture thereof. The catalyst of the invention has very high activity at low temperature, high anti-poisoning capacity and thermal stability and broad application prospect.

The invention discloses a preparation method of a MXene loaded PtRhFe ternary alloy catalyst. The method comprises that an organic solvent, a platinum source, a rhodium source, an iron source, a substrate material MXene powder and a surfactant are mixed and stirred uniformly, and make hydrothermal reaction; and centrifugation, washing, drying and grinding are carried out to obtain dry powder, namely a 2D material of MXene nanosheet loaded porous spherical PtRhFe ternary alloy particle product. The technology is simple, the repeatability is high, the prepared has an excellent enthanol oxidizability in an electrolyte including 1.0 mole/L potassium hydrate and 1.0 mole/L ethanol, and the peak current density can reach 3407milliampere/milligram which is 4.2 times of the peak current density ofa commercial platinum carbon catalyst in the platinum capacity of 46.7%. The catalyst can be widely applied to field of electrocatalysis enthanol oxidation, and enables large-scale commercializationof direct enthanol fuel cells.

The invention discloses a supported palladium-ultrathin CoNi-LDH (Layered Double Hydroxide) nanosheet composite material as well as a preparation method and application thereof. The preparation methodcomprises the following steps: firstly, preparing ultrathin CoNi-LDH nanosheets by using a one-step hydro-alcohol thermal-solvent method, and supporting noble metal Pd nanoparticles by the ultrathinCoNi-LDH nanosheets as a carrier so as to obtain the supported palladium-ultrathin CoNi-LDH nanosheet composite material. The composite material can be applied to an electrocatalytic ethanol oxidationreaction, and has the advantages of high mass activity, good stability, good anti-poisoning ability and the like. The advantages can be attributed to the following aspects: (1), the ultrathin carriercan provide a larger electrochemical activity area, good electrical conductivity, and good CO poisoning resisting ability; and (2), the Ni-based LDH carrier can remove carbonaceous intermediates nearPdNPs sites, the Co element which is highly dispersed in laminates can achieve uniform and solid loading of PdNPs and is beneficial to sufficient utilization of PdNPs, and thus catalytic activity andstability can be synergistically improved.

The invention relates to a nano platinum-cobalt/porous gold/graphene composite material and a preparation method thereof. The nano platinum-cobalt/porous gold/graphene composite material is used for manufacturing glucose-detection graphene composite paper electrodes and assembling electrochemical blood sugar sensors. The method comprises the following steps: supporting a nano porous gold film on the surface of high-strength high-flexibility high-stability high-electric-conductivity graphene paper, and growing platinum-cobalt bimetal nanoparticles on the nano porous gold film in situ by one-step electrodeposition, thereby obtaining the nano porous alloy/graphene paper-like composite material. The nano porous alloy supported on the graphene paper has high electrocatalytic oxidizing capacity on glucose; the glucose can generate an obvious catalytic current on the composite paper electrode surface; the magnitude of the current density has favorable linear relationship with the glucose concentration; and thus, when the electrode prepared from the nano platinum-cobalt/porous gold/graphene composite material is used for assembling the electrochemical glucose sensor system, the electrochemical glucose sensor system can be used for determining the glucose in the human blood sample in a stable, sensitive, accurate and fast way.

The invention discloses an anti-poisoning Pt-based nano-catalyst, and a preparation method and application thereof. An ultrathin h-BN shell structure is formed on the surface of a carbon-supported Ptand Pt-based alloy nano-catalyst by utilizing a surface coating method to obtain a core-shell nano-structure of Pt@h-BN/C and PtTM@h-BN/C(TM is a transition metal, such as Ru, Sn, Au and Fe). The catalyst serves as an H2-O2 proton exchange membrane fuel cell anode catalyst which can remarkably inhibit the CO poisoning effect on a Pt-based catalyst; the catalyst can also be used in a direct methanol fuel cell and can show resistance to methanol poisoning.

The invention relates to a preparation method and application of a fuel cell catalyst. Electrochemical dealloying is performed. The synthesis method adopts a continuous reduction method, and includesthe steps that a triblock copolymer P123 serves as a protecting agent, and sodium borohydride serves as a reducing agent; a certain amount of P123 is taken and dissolved in redistilled water, a cobaltchloride solution is added to the P123 solution, before reaction, nitrogen is introduced to remove oxygen, continuous stirring is performed, and the reaction temperature is controlled to be room temperature (30 DEG C); a sodium borohydride solution is slowly dropwise added to the reaction liquid, 30 minutes after dropwise adding, a mixed solution of chloroauric acid and potassium chloropalladateis slowly dropwise added to the reaction liquid, and the reaction is stopped after lasting 4 hours; the reaction liquid is centrifuged and washed three to five times to obtain the ternary CoAuPd alloycatalyst for fuel cells. The special ternary CoAuPd alloy catalyst has excellent methanol catalytic oxidation performance and oxygen reduction catalytic activity after electrochemical gradient dealloying and is a fuel cell catalyst with broad development prospects.

The invention discloses nanoscale platinum-rhodium alloy powder and a preparing method thereof, and belongs to the field of preparing nano metal materials. The size distribution of the platinum-rhodium alloy powder is 50-100 nm, the average particle size is 65 nm, the open setting density is 1.2-1.6 g/cm<3>, and the tapping density is 1.8-2.0 g/cm<3>. The platinum-rhodium alloy powder is prepared through a hydrothermal method, and a chloroplatinic acid and rhodium trichloride mixed solution, an organic reducing agent and a dispersing agent are put into a stainless steel reaction kettle with a polytetrafluoroethylene lining and heated for a period of time to prepare the nanoscale platinum-rhodium alloy powder. The alloy powder prepared through the method is small in particle size, size distribution is concentrated, the nanoscale platinum-rhodium alloy powder can be used for preparing a catalytic electrode of a NOx sensor, and the preparing method is simple, easy to implement and beneficial for industrial production.

A method for preparing a nanowire sheet intercalated structure supported type direct alcohol fuel cell catalyst and relates to a method for preparing a direct alcohol fuel cell catalyst. The problems that in an existing direct alcohol fuel cell catalyst performance degradation mechanism, nanoscale catalyst Pt particles are poisoned, alcohol fuel conveying is hindered, and catalyst preparation cost is high are solved. The method includes the steps that a graphite oxide sheet serves as a carrier, according to different properties of nanowires and graphene or a modified graphene carrier, and nanowires directly grow on the carrier to form the nanowire sheet intercalated structure supported type catalyst with different adsorption layers. The catalyst prepared through the method is beneficial to alcohol fuel conveying, and has the advantages of being low in cost, high in product poison resistance, high in activity and high in stability. The catalyst is mainly used for methyl alcohol fuel cells.

The invention discloses a method for enhancing air poison resistance of Zr2Fe alloy. The method for enhancing the air poison resistance of the Zr2Fe alloy includes steps: S1, simultaneously loading Zr2Fe alloy particles and stainless steel balls into a stainless steel vacuum ball milling tank, and connecting the stainless steel vacuum ball milling tank with a hydrogen storage performance test system; S2, pumping gas out of the stainless steel vacuum ball milling tank, and inflating the stainless steel vacuum ball milling tank with argon gas; S3, performing ball milling on the Zr2Fe alloy particles; S4, inflating the stainless steel vacuum ball milling tank with the argon gas, and passivating the Zr2Fe alloy particles; S5, placing the stainless steel vacuum ball milling tank into a glove box, controlling air inflow of air, and exposing Zr2Fe alloy powder to air; S6, sieving the Zr2Fe alloy powder; S7, preparing silicon dioxide sol; S8, adding the Zr2Fe alloy powder into the silicon dioxide sol and stirring the Zr2Fe alloy powder so as to form cream; S9, heating and drying the cream. The method for enhancing the air poison resistance of the Zr2Fe alloy solves the problem that the Zr2Fe alloy is poor in air poison resisting ability, strengthens use stability of the Zr2Fe alloy, and prolongs use life of the Zr2Fe alloy.

The invention discloses a nanoporous structure copper oxide-titanium dioxide-palladium-nickel oxide composite material and a preparation method thereof and alcohol catalytic property application. TheCuO-TiO2-Pd-NiO composite material with a uniform nanoporous structure is prepared from a Cu-Ti-Pd-Ni original amorphous alloy strip as a raw material by use of an aqueous hydrochloric acid solution as an etchant solution by a chemical de-alloying method. The method is low in cost, simple in operation, and easy to control, and has good feasibility, and the prepared CuO/TiO2/Pd-NiO composite material has good electrocatalytic properties for alcohols.

The embodiment of the invention discloses a graphene-based catalyst as well as a preparation method and application thereof. The graphene-based catalyst comprises a graphene-based carrier, a polypyrrole spacer and active catalyst particles loaded on the graphene-based carrier, the polypyrrole spacer is positioned between the two adjacent layers of graphene-based carriers; the polypyrrole spacers are arranged in an oriented manner; the graphene-based carriers are directionally arranged; the oriented arrangement direction of the polypyrrole spacers is the same as the oriented arrangement direction of the graphene-based carrier, the mass ratio of the graphene-based carrier to the polypyrrole spacers is 95: 5-70: 30, and the mass of the active catalyst particles accounts for 5-25% of the totalmass of the catalyst. The catalyst is prepared by applying an electric field. The catalyst prepared by the invention has the excellent characteristics of strong catalytic performance, high stability,strong conductivity, strong CO toxicity resistance and the like.

The invention discloses a palladium/nitrogen-doped titanium dioxide electrocatalyst as well as a preparation method and application thereof. The palladium/nitrogen doped titanium dioxide electrocatalyst comprises an N-TiO2 carrier and Pd nano particles, the N-TiO2 carrier is TiO2 doped with N, and the Pd nano particles are loaded on the N-TiO2 carrier. According to the Pd/N-TiO2 electrocatalyst, aPd electronic structure is optimized through regulation and control of a semiconductor energy band structure, so that the capacity of adsorbing chlorine-containing pollutants and products is balanced, the poisoning resistance of the Pd/N-TiO2 electrocatalyst is improved, the dechlorination performance of the Pd/N-TiO2 electrocatalyst is enhanced, and compared with a Pd/TiO2 electrocatalyst, the Pd/N-TiO2 electrocatalyst is obviously improved in activity and stronger in dechlorination performance.