7 results about "Pd nanoparticles" patented technology

The invention relates to a palladium molecular sieve catalyst and a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing palladium salt with an organic solvent, and adding a high-silicon molecular sieve carrier to obtain a catalyst precursor; and (2) carrying out non-equilibrium thermal shock treatment on the catalyst precursor, and cooling to obtain the palladium molecular sieve catalyst. A non-equilibrium thermal shock method is adopted, second-level transient heating is used for promoting in-situ decomposition and anchoring of a Pd precursor on the surface of the molecular sieve, Pd nano-particles which are uniform in particle size and uniform in dispersion are obtained, and the problem that precious metal is sintered and gathered in the steady-state roasting process is effectively solved; the catalyst shows excellent low-temperature activity and long-term stability in methane catalytic combustion reaction, effectively solves the problem of catalyst deactivation caused by high temperature and high water vapor in industrial waste gas treatment, and has important application potential in the field of environmental protection such as gas engine waste gas and coal mine gas treatment.

This application relates to the field of catalyst technology, disclosing an electron-rich Pd nanocatalyst, its preparation method, and its application. The electron-rich Pd nanocatalyst comprises a sheet-like Mg(OH)₂ support and Pd nanoparticles uniformly loaded on the sheet-like Mg(OH)₂ support; wherein the thickness of the Mg(OH)₂ sheet is less than 2 nm; and the average particle size of the Pd nanoparticles is less than 4 nm. The preparation method includes dispersing the Mg(OH)₂ support in water, sequentially adding a palladium source and urea, refluxing at 55-65°C to obtain a precursor solution; adding a reducing agent to the precursor solution to carry out the reaction, collecting the solid deposit, washing, and drying to obtain the final product. This application, by regulating the electronic structure of the Pd nanoparticles, significantly increases the electron density on their surface, increasing the repulsion of reaction products, weakening the adsorption of reaction products on the catalyst surface, avoiding poisoning of the catalyst active sites, and improving the reactivity and selectivity of the Pd nanocatalyst for the hydrogenation of nitrile compounds at low temperatures.

The application discloses a palladium-loaded vanadium oxide doped nitrogen-carbon material and a preparation method and application thereof, and the preparation method is as follows: S1, zinc salt and vanadium salt are dissolved in a composite solvent according to a mass ratio of 95:3-7, then 1H-1,2,3-triazole is added to form a suspension A, the obtained suspension A is continuously stirred and reacted, then is centrifuged, washed and dried to obtain a Zn / V-MET-6 product; S2, the Zn / V-MET-6 is calcined in a tube furnace at 850 DEG C-1000 DEG C for 1h-4h, and then is cooled to room temperature to obtain vanadium oxide doped nitrogen-carbon; S3, the vanadium oxide doped nitrogen-carbon is uniformly stirred and mixed with water and sodium tetrachloropalladate, then a sodium borohydride reducing agent is added, after a reduction reaction, a suspension B is obtained; the obtained suspension B is centrifuged, washed and dried to obtain the palladium-loaded vanadium oxide doped nitrogen-carbon material; the catalyst loads Pd nanoparticles in a carrier, and after reduction, a porous composite material is obtained, the catalyst has good stability and excellent performance in catalyzing decomposition of formic acid.

The invention belongs to the technical field of nano materials and biological catalysis, and particularly relates to a preparation method of cerium atom doped palladium particle nano enzyme. The method comprises the following steps: uniformly mixing palladium chloride and cerium chloride which are used as metal precursors, phloroglucinol which is used as a reducing agent and a mixed solution of oleylamine and octadecene which is used as a solvent and a dispersion medium, carrying out high-temperature reaction in a closed reaction kettle, and centrifuging, washing and drying a reaction product to obtain the Ce atom-doped Pd nano-particles with waxberry-shaped morphology. According to the invention, Ce is embedded into a Pd lattice in an atomic-scale dispersion form, and most of Ce is located at the junction of the Pd (111) and Pd (100) crystal faces to form a d-f orbital hybrid structure, so that the electron transfer ability of the material is significantly enhanced. The prepared nano-enzyme has excellent catalase-like activity and oxygenase-like activity at the same time under the weak acid condition, the activity of the two enzymes can be efficiently cascaded, and the catalytic activity is remarkably improved compared with that of the nano-enzyme without Pd doping.

This invention discloses a catalyst supported on carbon-loaded Pd nanoparticles or PdNi alloy nanoparticles, its preparation method, and its application, belonging to the field of chemical engineering technology. The preparation method includes: preparing an aqueous solution of a metal salt by adding water to a metal salt and a surface modifier; mixing the aqueous solution of the metal salt and an aqueous solution of a reducing agent under enhanced mass transfer conditions, reacting to obtain a Pd / PdNi alloy nanoparticle dispersion; immersing a support in the dispersion to obtain a precursor; then removing the solvent, washing, and calcining to obtain the catalyst supported on carbon-loaded Pd / PdNi alloy nanoparticles. This invention also discloses the catalyst supported on carbon-loaded Pd nanoparticles or the catalyst supported on carbon-loaded PdNi alloy nanoparticles prepared by the above method, and its application as a hydrogenation catalyst. The Pd and PdNi alloy nanoparticles in the catalyst of this invention have high crystallinity / alloying degree, small particle size, and uniform distribution; good catalytic effect, improved catalyst lifetime and loading stability, and reduced catalyst cost.

This invention belongs to the field of pharmaceutical formulation technology, specifically disclosing a hydrogen storage composite metal-organic framework, its preparation method, and its applications. The preparation method of the hydrogen storage composite metal-organic framework includes the following steps: adjusting a gallic acid solution to alkalinity, adding magnesium chloride hexahydrate and reacting, centrifuging the magnesium-gallic acid metal-organic framework material to obtain Mg-GA-MOF; mixing Mg-GA-MOF with anhydrous ethanol, adding anhydrous sodium tetrachloropalladate solution in ethanol, equilibrating the solution, and slowly adding anhydrous sodium tetraborate solution in ethanol to obtain Pd / Mg-GA-MOF; and then loading with hydrogen. This invention utilizes both the porous microstructure of the MOF to physically adsorb hydrogen and the Pd nanoparticles embedded in the framework structure to chemically adsorb hydrogen. The combination of these two methods significantly improves the hydrogen loading efficiency of Pd / Mg-GA-MOF while exhibiting good biocompatibility. Furthermore, cell experiments show that Pd / Mg-GA-MOF can effectively scavenge various ROS and inhibit the inflammatory response of microglia, demonstrating high clinical application potential in stroke repair.