42 results about "Hydrothermal deposition" patented technology

The present invention provides a preparation method for a load type hydrogenation catalyst with high activation by hot water deposition. The saline solution of the reactive metal of VIB family is taken as a precursor, an inorganic acid solution as a precipitator and an organic acid as a dispersant; the metallic oxide particles are generated by a liquid deposition reaction in a hydrothermal condition; the organic acid is used for avoiding the conglobation of the oxide particles as well as reducing mutual effects between the oxide and a carrier; the high reaction activation and strong penetrability of subcritical water is utilized to evenly disperse active components on the carrier. The method is particularly suitable for preparing a W / gamma-Al2O3 catalyst, the prepared W / gamma-Al2O3 catalyst has high dispersion degree, relatively weak mutual effects between the active components and the carrier and higher desulfurization activation compared with a catalyst which has same content of active components and is prepared by a conventional pore volume saturation soaking method.

A process for making a catalyst having precious metal nanoparticles deposited on a support includes first providing an aqueous dispersion of support particles. A pre-treatment slurry is prepared by mixing the aqueous dispersion of support particles with a water-soluble precious metal precursor and a reducing agent. The pre-treatment slurry is hydrothermally treated at a temperature in the range of from about 40° C. to about 220° C. for a time sufficient to deposit precious metal nanoparticles on the surface of the support particles, the precious metal nanoparticles having an average particle size less about 50 nm.

A c-axis-oriented HAP thin film synthesized by seeded growth on a palladium hydrogen membrane substrate. An exemplary synthetic process includes electrochemical seeding on the substrate, and secondary and tertiary hydrothermal treatments under conditions that favor growth along c-axes and a-axes in sequence. By adjusting corresponding synthetic conditions, an HAP this film can be grown to a controllable thickness with a dense coverage on the underlying substrate. The thin films have relatively high proton conductivity under hydrogen atmosphere and high temperature conditions. The c-axis oriented films may be integrated into fuel cells for application in the intermediate temperature range of 200-600° C. The electrochemical-hydrothermal deposition technique may be applied to create other oriented crystal materials having optimized properties, useful for separations and catalysis as well as electronic and electrochemical applications, electrochemical membrane reactors, and in chemical sensors.

A c-axis-oriented HAP thin film synthesized by seeded growth on a palladium hydrogen membrane substrate. An exemplary synthetic process includes electrochemical seeding on the substrate, and secondary and tertiary hydrothermal treatments under conditions that favor growth along c-axes and a-axes in sequence. By adjusting corresponding synthetic conditions, an HAP this film can be grown to a controllable thickness with a dense coverage on the underlying substrate. The thin films have relatively high proton conductivity under hydrogen atmosphere and high temperature conditions. The c-axis oriented films may be integrated into fuel cells for application in the intermediate temperature range of 200-600° C. The electrochemical-hydrothermal deposition technique may be applied to create other oriented crystal materials having optimized properties, useful for separations and catalysis as well as electronic and electrochemical applications, electrochemical membrane reactors, and in chemical sensors. Additional high-density and gas-tight HAP film compositions may be deposited using a two-step deposition method that includes an electrochemical deposition method followed by a hydrothermal deposition method. The two-step method uses a single hydrothermal deposition solution composition. The method may be used to deposit HAP films including but not limited to at least doped HAP films, and more particularly including carbonated HAP films. In addition, the high-density and gas-tight HAP films may be used in proton exchange membrane fuel cells.

The invention discloses a method for preparing a modified calcium oxide-based high-temperature carbon dioxide adsorbent and belongs to the technical field of adsorbents. The method disclosed by the invention comprises the following steps: taking snail shells as raw materials, grinding to obtain calcium carbonate through brine wash grinding, performing compound modification on calcium carbonate by using flavones-enriched ginkgo extract and microbes, coating the carbonic acid surface with aluminum source by adopting a hydrothermal deposition method, and performing high-temperature calcinations to obtain the carbon dioxide adsorbent. According to the invention, the surface of calcium carbonate is modified by hydroxyl-enriched ginkgetin, so that hydroxyl functional groups on the calcium carbonate surface are increased, active sites are provided for aluminum source deposition, an aluminum oxide crystal layer is deposited on the calcium oxide surface due to high-temperature calcination, and the heat resistance of calcium oxide is improved. Meanwhile, the adsorbing capacity of calcium oxide on carbon dioxide is improved, the problems that the adsorbing capacity and recycled adsorption rate of calcium oxide are influenced because the traditional carbon dioxide adsorbent is insufficient in heat resistance and a microstructure of calcium oxide easily changes under the effect of high temperature cracking are solved, and the method has wide application prospects.

The invention discloses a preparation method and application of a super-hydrophobic glass fiber composite oil-water separation material, and the material preparation method comprises the following steps: dissolving basic cupric carbonate in an alkali solution to obtain a mixed solution I; impregnating a glass fiber felt in the mixed solution I to obtain a CuO glass fiber felt; dissolving polydimethylsiloxane in an organic solvent to obtain a mixed solution II; and soaking the CuO glass fiber felt in the mixed solution II, and carrying out high-temperature curing treatment to obtain the super-hydrophobic glass fiber composite oil-water separation material. The super-hydrophobic glass fiber composite oil-water separation material is prepared by loading a copper oxide crystal and a polydimethylsiloxane (PDMS) solution onto the surface of a glass fiber composite material by using a hydrothermal deposition method and an excessive impregnation method respectively. Due to ultrahigh hydrophobic and oleophylic properties and a superposable combination mode, the material has a good demulsification effect on various emulsified oil, and can be widely applied to oil-water separation operation.

The invention discloses a method for preparing an anatase titanium dioxide nanoribbon array membrane. The method adopts a non-hydrothermal sedimentation method and comprises the following steps: immersing a pickled metal titanium plate into a hydrogen peroxide reaction liquid with melamine and tungstic acid, reacting for 6-60 hours at 60-90 DEG C, washing the reacted titanium plate by using deionized water, drying, and preserving heat for 1 hour at 450 DEG C. The method does not need a hydrothermal environment of high temperature and high pressure and is simple and feasible in preparation process and low in cost, the prepared anatase titanium dioxide nanoribbon array membrane is uniform, good in crystallization, solid in combination with a substrate, applicable to large-scale industrial production, and has the potential to be practically applied to fields such as photocatalysis, photoelectrocatalysis and thin-film solar cell photoelectrodes.

The present invention provides a preparation of C / C-Ni-Cu composite material and its preparation method and application. The method uses chopped carbon fiber as a skeleton, and adopts microwave hydrothermal reaction to deposit a carbon layer on the surface of the carbon fiber. Glucose is the carbon source. Nickel nitrate hydrate was used as the nickel source, and urea was used as the precipitating agent to deposit C and NiO particles in the carbon fiber preform by hydrothermal technology. The hydrothermally deposited C / C‑NiO composites were sintered by vacuum carbothermal reduction reaction to obtain C / C‑Ni composites, and the catalytic graphitization of matrix carbon was realized. Using the infinite mutual solubility of Ni and Cu, the C / C-Ni-Cu composite material was prepared by molten copper infiltration technology, and the C / C-Ni-Cu composite material with excellent performance was obtained.