40 results about "Pd nanoparticles" patented technology

The invention provides a Cu2O-based heterogeneous composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: coating the surface of a Cu2O hollow sphere substrate with a carbon layer, and depositing layered double hydroxides (LDHs) and metal palladium (Pd) nanoparticles on the carbon layer. According to the material, through a Cu2O-carbon layer-LDHs-Pd multistage heterostructure design, space optimization of light absorption, charge transfer and catalytic sites is realized; cu2O-carbon layer-LDHs interface coupling promotes directed migration of photo-induced electron-hole pairs, and the surface plasmon resonance effect of Pd nanoparticles enhances the charge separation efficiency; the LDHs optimizes a charge transfer path through surface oxygen vacancy or metal valence cycle, so that synergistic oxidation of non-free radicals and free radicals is realized, the organic matter degradation efficiency is remarkably improved, the oxidation path is widened, and the performance bottleneck of a single material is broken through.

This invention discloses a method for modifying the support medium of a Pd catalyst and its application. The preparation method of the Pd catalyst includes reacting zirconium salt, organic ligands, and acid to obtain a support UiO-66-X; then loading Pd onto the support UiO-66-X and reducing it to obtain the catalyst Pd@UiO-66-X; the organic ligands include 2-nitroterephthalic acid, 2-methoxyterephthalic acid, 2-aminoterephthalic acid, and terephthalic acid, and X is selected from NO2, OMe, NH2, and H. This invention changes the surface electron cloud density of the supported Pd nanoparticles by changing the ligands (-NO2, -H, -OMe, -NH2) of the support UiO-66, resulting in different abilities to activate hydrogen, thereby regulating the dehydrogenation and hydrogenation reactions in the racemicization process of Pd catalysis. The synergistic effect of different ligands with Pd changes the racemicization catalytic activity.

The invention discloses a Pd-SnO2-SiO2 self-supporting flexible nanofiber membrane gas sensor for hydrogen detection and a preparation method of the Pd-SnO2-SiO2 self-supporting flexible nanofiber membrane gas sensor, and aims to solve the problems that an existing flexible gas sensor depends on an organic substrate and is poor in high temperature resistance and insufficient in room temperature performance. According to the sensor, an electrostatic spinning technology is adopted for preparing a double-phase nanofiber membrane with crystalline phase SnO2 as a framework and amorphous phase SiO2 as a filling agent, and self-supporting can be achieved without a flexible substrate; pd nanoparticles are deposited on the fiber membrane through magnetron sputtering, and an Ag interdigital electrode is printed. Wherein the crystal-amorphous double-phase structure not only endows the material with excellent flexibility and high air permeability, but also provides a rich gas reaction interface; due to the full-inorganic characteristic, the high-temperature-resistant performance is achieved. The sensor shows high sensitivity, high selectivity and good flexible stability to hydrogen at room temperature under the environment of 37 DEG C and 80% humidity, is suitable for detecting hydrogen exhaled by a human body through wearable equipment such as a mask, and provides a new scheme for the metal oxide flexible gas sensor.

The invention provides a catalyst as well as a preparation method and application thereof and a preparation method of tetrahydrofurfuryl alcohol, the catalyst takes mesoporous silica as a carrier, the surface of the carrier is modified with polyethylene glycol and an alkyl chain to form an amphiphilic surface, and Pd nanoparticles are loaded in mesopores. The surface of the mesoporous silica supported palladium catalyst is modified with polyethylene glycol and alkyl chains through covalent bonds to form an amphiphilic interface, hydrophilic polyethylene glycol chains enrich furfuryl alcohol molecules through hydrogen bonds, and hydrophobic alkyl chains capture hydrogen microbubbles, so that the gas-liquid interfacial tension can be effectively reduced, large bubbles can be broken, and nano bubbles can stably exist; and the preparation of tetrahydrofurfuryl alcohol realizes efficient reaction under obviously reduced pressure.

The invention relates to the technical field of catalysts, in particular to a palladium-based catalyst derived from MOFs as well as a preparation method and application of the palladium-based catalyst. The preparation method comprises the following steps: firstly preparing an MOF material, then preparing a palladium-based MOF precursor, mixing the palladium-based MOF precursor with a nitrogen-containing precursor, heating and roasting in an inert atmosphere, and cooling to room temperature. An external nitrogen-containing precursor is introduced in the high-temperature pyrolysis process and is jointly roasted with a palladium-based MOF precursor, the nitrogen doping amount in the carbon carrier is remarkably increased, and high dispersion and electronic structure optimization of Pd particles are achieved by enhancing the anchoring effect and electronic regulation and control of nitrogen species on the Pd nanoparticles; therefore, high activity, high selectivity and high stability are simultaneously obtained in the selective hydrogenation reaction of 2-methyl-3-butyne-2-alcohol.

The application provides a Pd-Cu bimetallic supported In2O3-TiO2 catalyst and a preparation method and application thereof, and belongs to the technical field of CO2 hydrogenation to prepare methanol. The catalyst comprises a composite carrier and Pd nanoparticles and Cu nanoparticles supported on the surface of the composite carrier. Pd and Cu are combined to form bimetallic sites in the application, the advantages of the bimetallic sites can be fully exerted, and the reaction activity of CO2 hydrogenation to prepare methanol can be significantly improved through the electronic effect and geometric effect between the metals. The Pd-Cu / In2O3-TiO2 catalyst provided by the application has the advantages of high conversion rate and high catalytic activity in the reaction of carbon dioxide hydrogenation to prepare methanol; wherein, in the process of carbon dioxide hydrogenation, the Pd-Cu / In2O3-TiO2 catalyst can obtain a one-way CO2 conversion rate of 23.5% and a methanol yield of 15.83% at 250 DEG C.

The invention provides an alkaline modified UiO-66 supported Pd nano-catalyst as well as a preparation method and application thereof, and relates to the technical field of catalysts. According to the catalyst, UiO-66 serves as a precursor, isonicotinic acid is used for substitution modification through a solvent-assisted ligand exchange strategy, then Pd nanoparticles are loaded through a co-reduction method to form the corresponding composite catalyst Pd / UiO-66-PA, and the catalyst is a regular octahedral porous composite material; the invention further provides application of the alkaline modified UiO-66 loaded Pd nano-catalyst in efficient hydrogen generation through formic acid decomposition. The catalyst has the advantages of being porous, multiple in active sites and the like, has multiple pore structures in the synthesis process, can effectively load Pd nano-particles in the catalyst, and maintains good overall morphology before and after loading. The catalyst can be used as a catalyst for decomposing formic acid to generate hydrogen, and has excellent catalytic performance at 60 DEG C.

The present application relates to the field of gas detection, in particular to a titanium carbide composite material, a preparation method thereof and a hydrogen detection application. The titanium carbide composite material comprises Ti3C2T x substrate and Pd nanoparticles loaded on the Ti3C2T x substrate. The Ti3C2T x substrate is a multilayer structure, and at least part of the Pd nanoparticles are loaded between the layers of the Ti3C2T x substrate multilayer structure. The hydrogen sensor using the titanium carbide composite material of the present application can detect hydrogen with high sensitivity and high selectivity in a room temperature environment.

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.

The invention discloses application of a composite hollow nanotube array which is coated with an MOF hydrophobic layer and has a core-sheath structure in gas-sensitive moisture resistance. The preparation method of the composite hollow nanotube array comprises the following steps: (1) synthesizing a ZnO nanowire on a substrate in situ as an array template; growing on the surface of the ZnO nanowire through a hydrothermal method to obtain an etching layer containing Sn, and sintering the etching layer containing Sn to obtain a SnO2 hollow nanotube array; and (2) loading Pd nano-particles and coating an MOF hydrophobic layer on the surfaces of nano-tubes of the SnO2 hollow nano-tube array in sequence to obtain the composite hollow nano-tube array. The composite hollow nanotube array has excellent sensitivity and selectivity, the lower limit of detection can reach the ppm level, the response speed is high, and the anti-humidity effect is good.

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 provides a catalyst and a preparation method, application and a preparation method of tetrahydrofurfuryl alcohol, the catalyst uses mesoporous silica as a carrier, the surface of the carrier is modified with polyethylene glycol and an alkyl chain to form an amphiphilic surface, and Pd nanoparticles are loaded in the mesopores. The mesoporous silica supported palladium catalyst has an amphiphilic interface formed by polyethylene glycol and an alkyl chain modified on the surface through a covalent bond, the hydrophilic polyethylene glycol chain enriches furfuryl alcohol molecules through hydrogen bonds, and the hydrophobic alkyl chain captures hydrogen microbubbles, which can effectively reduce the gas-liquid interfacial tension, is helpful to the breaking of large bubbles and the stable existence of nanobubbles, and makes the preparation of tetrahydrofurfuryl alcohol realize efficient reaction under significantly reduced pressure.

The invention discloses a CeO2 loaded noble metal nanoparticle and a low-temperature dispersion method. The method comprises the following steps: (1) mixing cerium oxide and metal platinum salt or metal palladium salt, and grinding to obtain solid powder; (2) roasting the solid powder obtained in the step (1) in an oxygen atmosphere; (3) roasting the solid powder obtained in the step (2) in a hydrogen atmosphere to obtain Pt or Pd nanoparticles loaded on the CeO2 carrier; and (4) carrying out low-temperature roasting treatment on the Pt or Pd nanoparticles loaded on the CeO2 carrier obtained in the step (3) in an NO atmosphere to obtain further dispersed Pt / CeO2 or Pd / CeO2. According to the method, the supported metal nanoparticles can be further dispersed at the low temperature of 200-400 DEG C, meanwhile, elements such as Cl do not need to be additionally introduced, the treatment method is simple, and industrial application prospects are achieved.

The invention relates to the technical field of gas sensors, and discloses a high-selectivity hydrogen sensor and a preparation method thereof.The sensor comprises an electrode plate and a gas sensitive layer attached to the surface of the electrode plate, and the gas sensitive layer is made of a Pd / WO3 composite material; the composite material is prepared from nano WO3 powder, potassium chloropalladite, Pluronic F-127 and L-ascorbic acid at room temperature through a chemical reduction method. According to the invention, ascorbic acid is adopted as a mild reducing agent and has a synergistic effect with a Pluronic F-127 dispersing agent, so that highly dispersed loading of Pd nanoparticles on the surface of WO3 is realized, and electron sensitization and chemical sensitization effects are enhanced. The obtained hydrogen sensor can work at room temperature, shows extremely high sensitivity, excellent selectivity and good stability to hydrogen, and is simple in preparation process, low in cost, small in energy consumption and suitable for large-scale popularization and application.

The invention discloses a porous carbon supported noble metal catalyst and a preparation method thereof, the catalyst comprises an N-P double-doped porous carbon carrier and a Pt / Pd nanoparticle and Fe / W monatomic composite active site, and the distance between the N-P double-doped porous carbon carrier and the Pt / Pd nanoparticle and Fe / W monatomic composite active site is 1-3 nm. Through N-P doping mediation electron coupling, metal electron state optimization and active site compounding, functional division of reactant activation, intermediate stabilization and toxic species removal is realized, and a dual anti-poisoning barrier is formed. The preparation process of the catalyst is mature, the dosage of noble metal is reduced by 30-50%, the catalytic efficiency is improved by 40-60%, the retention rate of CO / sulfur poisoning resistance activity is 95-98%, the retention rate of activity after 500 cycles is 90-95%, and the catalyst is suitable for various industrial catalysis scenes.

The invention discloses a preparation method and application of an Mxene-derived carbon-loaded iron-palladium heterojunction ORR / OER bifunctional electrocatalyst, and the specific process is as follows: mixing a mixed solution containing Fe < 3 + > and Ni < 2 + > with a Ti3C2Tx colloidal solution, then adding an alkaline solution, and carrying out a hydrothermal reaction in a non-oxygen atmosphere to obtain a NiFe LDH-coated IL / CDC colloidal solution; the method comprises the following steps: adding a Pd < 2 + >-containing solution into a Ti3C2Tx colloidal solution, and carrying out hydrothermal preparation to prepare IL / Ti3C2Tx derived carbon coated Pd nanoparticles; and mixing with a colloidal solution, and carrying out an ultrasonic reaction to prepare the ORR / OER bifunctional electrocatalyst. The electrocatalyst prepared by the invention has the characteristics of large pore specific surface area, high active site density, low resistance, low overpotential and the like, and shows the advantages of high catalytic efficiency, long-term stability and the like in the charge-discharge reaction of the zinc-air battery under low and high current density.

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 electrochemical catalysis, and particularly relates to a composite electrocatalyst, a preparation method thereof and application of the composite electrocatalyst in preparation of organic acid salt by electrocatalytic oxidation of alcohol compounds. The preparation method of the composite electrocatalyst comprises the following steps: taking soluble palladium salt, a reducing agent and a first surfactant as raw materials, taking foam metal as a substrate material, loading Pd nanoparticles on the foam metal in a weak acid environment by adopting a solvothermal method, and recording as Pd / foam metal; pd / foam metal is used as a working electrode substrate, and Ni nanoparticles are deposited on the surface of the Pd / foam metal in situ by adopting an electro-deposition method under the action of supporting electrolyte, soluble nickel salt and a second surfactant. The composite electrocatalyst can be used for electrocatalytically oxidizing various alcohol compounds (such as methanol, ethanol, ethylene glycol, 1, 2-propylene glycol, 1, 3-propylene glycol, glycerol, 1, 3-butanediol, 1, 4-butanediol and the like) into high-value-added chemical organic acid salts, so that the value of the alcohol compounds is increased.

The invention belongs to the technical field of gas sensing, and relates to a Pd / SiC-C core-shell nanowire, a high-temperature hydrogen sensor as well as a preparation method and application of the Pd / SiC-C core-shell nanowire. According to the Pd / SiC-C core-shell nanowire, a cubic silicon carbide nanowire serves as an inner core, an amorphous mesoporous carbon shell layer is formed on the inner core in an in-situ growth mode, Pd nanoparticles are coated with the amorphous mesoporous carbon shell layer, the Pd nanoparticles are evenly anchored to the surface of the cubic silicon carbide nanowire, and a stable Pd / SiC-C core-shell structure is formed. The structure effectively inhibits agglomeration and falling of Pd nano-particles in a high-temperature environment, and the dispersity and thermal stability of Pd are remarkably improved. When the material is applied to a hydrogen sensor, high sensitivity, quick response / recovery characteristic and excellent long-term stability are shown, a reliable solution is provided for hydrogen detection under high-temperature harsh working conditions, and the material has important engineering application value in the fields of aerospace, hydrogen energy storage and transportation and the like.

The invention belongs to the technical field of photocatalysis, and particularly relates to a preparation method and application of a multifunctional sulfur-zinc-cadmium photocatalyst. The method comprises the following steps: preparing a sulfur-zinc-cadmium crystal nucleus through a liquid-phase ion exchange method, promoting regrowth of the sulfur-zinc-cadmium crystal nucleus through a molten salt calcination method to obtain a sulfur-zinc-cadmium photocatalyst, and carrying out sulfur ion modification on the surface of the sulfur-zinc-cadmium photocatalyst through a coprecipitation method to obtain sulfur-zinc-cadmium with a sulfur-rich surface. And finally, selectively depositing Pd nano-particles on the high-index crystal face of the sulfur-zinc-cadmium with the sulfur-rich surface through photochemical reduction to obtain the multifunctional sulfur-zinc-cadmium photocatalyst. The catalyst can be used for a reaction system for preparing N-benzylidenebutylamine through benzylamine coupling, preparing hydrogenated benzoin through benzyl alcohol coupling, preparing 2-hydroxymethyl pyrazine through 2-formic acid pyrazine reduction and preparing benzaldehyde and other template micromolecular aromatic compounds through benzyl alcohol oxidation. The catalyst is simple in preparation method and wide in raw material source, can drive reactions such as coupling, reduction and oxidation of small molecular aromatic compounds, and has industrial application prospects.

The invention belongs to the technical field of gas sensing materials and safety monitoring, and discloses a gas leakage detection color-changing flexible film based on lead acetate dual-mode response and a preparation method and application thereof, and the method comprises the following steps: coating a molecular sieve layer: mixing ZSM-5 zeolite powder with polyvinyl alcohol, and blade-coating a PET substrate; catalytic layer loading: ball-milling and mixing lead acetate, Pd nanoparticles and mesoporous SiO2, and coating the molecular sieve layer with the mixture to obtain a Pd-lead acetate catalytic layer; performing reaction layer and packaging: performing pure lead acetate slurry coating to obtain a reaction layer, and performing vapor deposition on a PI layer to obtain a packaging layer; gum treatment: spraying high-temperature-resistant silica gel, and curing to form a self-adhesive layer; the mass ratio of the molecular sieve layer to the Pd-lead acetate catalyst layer to the reaction layer to the encapsulation layer is (20-30): (50-60): (10-15): (5-10). The product provided by the invention has relatively good flexible adaptability and environmental robustness; and quick response and low-cost mass production can be realized.

The invention relates to the technical field of catalysis, and discloses a supported metal-based catalyst as well as a preparation method and application thereof. The supported metal-based catalyst comprises a carrier and active components, the carrier comprises nitrogen-doped carbon black, and the active components comprise Pd nanoparticles and bismuthyl carbonate; the supported metal-based catalyst contains oxygen vacancies. According to the supported metal-based catalyst, the catalytic activity of the Pd center is enhanced through the synergistic effect of Pd and bismuthyl carbonate, the catalytic efficiency is guaranteed in the alcohol oxidation esterification reaction, meanwhile, the dosage of the catalyst is reduced, and the cost is reduced.

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.

The invention belongs to the technical field of catalyst preparation, and particularly relates to a Pd-supported Cs2SnCl6 perovskite material and a preparation method and application thereof, and the preparation method is easy to operate, simple in process and controllable in cost; according to the Pd-loaded Cs2SnCl6 perovskite material, the characteristic of water resistance of a carrier and the characteristic of surface plasmon resonance of Pd nanoparticles are combined, so that the absorption spectrum range of the material can be effectively widened, the carrier transport capacity in the photo-assisted electro-catalysis process is improved, the overpotential of the material in an oxygen evolution reaction is reduced, and the catalytic activity of the material is further improved.

The invention relates to a preparation method of Pd NPs / Co3O4 NRs (at) BSA composite nano-enzyme for glucose detection as well as a product and application of the Pd NPs / Co3O4 NRs (at) BSA composite nano-enzyme, and belongs to the field of combination of new materials and biological detection. Co3O4 nanorods are prepared through a hydrothermal method and high-temperature decomposition, the surfaces of the Co3O4 nanorods are subjected to amination modification, the surfaces of the aminated Co3O4 nanorods are coated with Pd nanoparticles through Pd-N bonds, and the catalytic performance is improved while the stability of the material is improved. The Pd NPs / Co3O4 NRs (at) BSA composite nano-enzyme provided by the invention has double-enzyme simulation activity, can simulate glucose oxidase and horse radish peroxidase for glucose detection, has the advantages of high detection sensitivity, wide linear range, simplicity and convenience in operation, low cost, high stability, recyclability, strong anti-interference capability and the like, and can be widely applied to detection of glucose. Important application prospects are shown in the fields of clinical diagnosis, food safety monitoring and the like.

This invention relates to the fields of environmental protection and new energy technologies, specifically disclosing a Pd-supported photothermal catalyst, its preparation method, and its application. The Pd-supported photothermal catalyst comprises a rare earth hexaboride support and Pd nanoparticles. The preparation method of the Pd-supported photothermal catalyst includes: weighing anhydrous rare earth chloride and magnesium boride powder, grinding and mixing them evenly, calcining them under vacuum, and after cooling to room temperature, immersing them in a dilute sulfuric acid solution and stirring, followed by centrifugation, washing, and drying to obtain the rare earth hexaboride support; adding PdCl2 solution and the rare earth hexaboride support to water, stirring until the solution is completely evaporated, calcining, and then reducing with a H2-Ar mixed gas to obtain the Pd-supported photothermal catalyst. This photothermal catalyst enhances the performance of the transition metal Pd in ​​the catalytic reaction of NO hydrogenation to ammonia synthesis through photothermal synergy by loading Pd nanoparticles onto the surface of the rare earth hexaboride support.

The invention relates to the technical field of Pd-based catalysts and preparation thereof, and discloses an ultra-low-loading Ga monatomic carbon carrier-loaded Pd ethylene glycol oxidation reaction catalyst and a preparation method and application thereof, the ultra-low-loading Ga monatomic carbon carrier-loaded Pd ethylene glycol oxidation reaction catalyst comprises an MOF-derived N-doped carbon carrier, Ga monatomic and Pd nanoparticles; ga single atoms and N atoms are synergistically anchored and loaded through defect sites on the surface of the carbon carrier, and Pd nanoparticles are dispersed on the surface of the carbon carrier and around the Ga single atoms. According to the scheme, Ga single atoms and Pd nano-particles are loaded on a carrier of the catalyst, the Ga single atoms and the Pd nano-particles form synergistic catalysis sites, the Ga single atoms regulate and control the d band center of Pd through the electron transfer effect, the adsorption energy barrier of ethylene glycol oxidation intermediates (such as acetaldehyde and acetic acid) and CO is reduced, meanwhile, desorption and conversion of the intermediates are promoted, and the catalytic activity of the catalyst is improved. The catalytic activity and the anti-poisoning capability are obviously improved.

The invention discloses an oral capsule for in-situ hydrogen production in intestinal tracts as well as a preparation method and application of the oral capsule. According to the invention, an industrial catalytic hydrogen production technology is miniaturized into an oral capsule, so that hydrogen can be controllably, continuously and safely produced in vivo. The interior of the capsule is composed of a catalyst Ag / Pd nano-particles and a hydrogen carrier formic acid, and a capsule shell is composed of a medical material polydimethylsiloxane which is breathable, waterproof and resistant to gastric acid and digestive enzymes, so that the high efficiency of catalytic hydrogen production in the capsule, the stability of hydrogen release and the safety of complete metabolism of excrement are ensured. In mechanism, hydrogen regenerates ferroptosis related antioxidants CoQ10H2, VKH2 and BH4 through hydrogenation reduction, ferroptosis is effectively inhibited, and intestinal diseases are treated.

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.