49 results about "Formic acid oxidation" patented technology

The invention discloses a supported palladium catalyst and a preparation method and application thereof. The supported palladium catalyst disclosed by the invention comprises a graphene carrier and palladium nano-crystals or palladium nano-alloys supported on the carrier, wherein the palladium nano-crystals or palladium nano-alloys account for 10-50 mass percent. The preparation method comprises the following steps: (1) dissolving palladium salt in oleylamine to obtain a palladium salt solution, or dissolving cobalt salt or nickel salt and palladium salt in oleylamine to obtain a mixed solution; (2) adding a boron-nitrogen compound into the palladium salt solution or the mixed solution, and adding an organic settling agent, thereby obtaining the palladium nano-crystals or palladium nano-alloys; and (3) supporting the palladium nano-crystals or palladium nano-alloys on graphene, thereby obtaining the supported palladium catalyst. The supported palladium catalyst and the preparation method disclosed by the invention have the advantages that the preparation method is low in reaction temperature and is simple and convenient, and the shape and size of the palladium catalyst can be controlled. Moreover, the active ingredients of the supported palladium catalyst disclosed by the invention are uniform in size and high in dispersity, and the catalyst is high in activity and can be used for catalyzing formic acid oxidation.

Electrocatalysts for the anode electro-oxidation of formic acid in direct formic acid fuel cells (DFAFCs). The Pd-, Pt- or PdPt-based electrocatalysts contain CeO2-modified ordered mesoporous carbon (OMC) as support material. Compositions and ratios of Pd:Pt in the electrocatalysts as well as methods of preparing and characterizing the catalysts and the CeO2-OMC support material.

High-quality bimetallic PtxCu100-x (x=54-80 at. %) nanocubes can be prepared from a hot organic solution. Synthetic conditions, such as the ratio of oleylamine / tetraoctylammonium bromide as well as the doses of 1-dodecanethiol and 1,2-tetradecanediol have been optimized to ensure a formation of Pt—Cu nanocubes. Electrochemical evaluation shows that the catalytic activity of Pt60Cu40 nanocubes for methanol oxidation is superior, in comparison with those of spherical Pt60Cu40 nanocubes and Pt nanocubes with similar sizes, implying that the {100}-terminated Pt60Cu40 nanocubes offer a higher activity for methanol oxidation reaction than those with mixed crystallographic facets do. As another example, it was identified that Pt80Cu20 nanocubes is the best electrocatalyst on the basis of the maintainable electrocatalytic activity (which is even slightly superior to that of pure Pt nanocubes) and remarkable long-term stability (˜300 hours vs 3 hours for Pt nanocubes) when being performed towards formic acid oxidation reaction.

The invention discloses a palladium-ruthenium nano-thorn assembly catalyst and a preparation method thereof. Sodium tetrachloropalladate and ruthenium chloride solution of which the concentration is 1-30mM, hydrochloric acid solution of which the concentration is 1-10M and ascorbic acid solution of which the concentration is 0.01-0.5M are independently prepared; the sodium tetrachloropalladate andruthenium chloride solution of which the total volume is 3.0mL is independently taken for mixing, then, 0.1-0.5mL of prepared hydrochloric acid solution is added, and 0.1-0.5g of potassium bromide and F127 can be added to be evenly mixed; finally, 1-10mL of ascorbic acid solution is added; and after solution is fully mixed, the mixture is heated in an oil bath pan to 70-130DEG C to react for 0.1-3h, and washing, centrifugation and drying are carried out to obtain the palladium-ruthenium nano-thorn assembly catalyst. The preparation technology is simple, reaction time is short, and the prepared material has an excellent electrochemistry formic acid oxidation property at a normal temperature under normal pressure.

The invention relates to a method for preparing Au / g-C3N4 composite-type micro-nano material. The method is realized by steps of adding g-C3N4 powder in 400-900nano in granularity to chloroauric acid solution, ultrasonically dispersing the g-C3N4 powder so as to prepare turbid liquid; heating the turbid liquid in water bath; then, adding sodium citrate to solution, stirring, washing, separating and drying a mixture so as to obtain Au / g-C3N4 composite-type micro-nano material; the Au / g-C3N4 composite-type micro-nano material has excellent photochemical catalysis effect to formic acid oxidation; and oxidation potential is negatively shifted by 800mV (close to the catalytic oxidation potential of Pt) without ctalyst poisoning phenomenon. According to the advantages of the invention, acquired composite material particles are even and not united; a preparation method is simple; and cost is relatively low.