In a process for forming a bulk hydroprocessing catalyst by sulfiding a catalyst precursor made in a co-precipitation reaction, up to 60% of the metal precursor feeds do not react to form catalyst precursor and end up in the supernatant as metal residuals. In the present disclosure, the metals can be recovered in a chemical precipitation step, wherein the supernatant is mixed with at least one of an acid, a sulfide-containing compound, a base, and combinations thereof to precipitate at least 50% of metal ions in at least one of the metal residuals, wherein the precipitation is carried out at a pre-select pH. The precipitate is isolated and recovered, yielding an effluent stream. The precipitate and/or the effluent stream can be further treated to form at least a metal precursor feed which can be used in the co-precipitation reaction. The process generates an effluent to waste treatment containing less than 50 ppm metals.

The invention relates to the method of forming a platinum-based catalytic coating on electrodes for using in electrochemical devices such as fuel cells or electrolysis cells. According to the invention, to produce a platinum-based catalyst, the carrier is preliminary cleaned by ion etching and the catalytic coating is applied onto the cleaned surface from at least one target based on platinum in vacuum in the primary gas plasma with addition of reactive gas, sputtering being done at the power density on the magnetron sputtered target within (0.004-0.17)*10.sup.5 W/m.sup.2 and the ratio of concentrations of the primary and reaction gas of 75-99%. Technical result: increased specific catalytic activity of the electrode's catalytic coating for electrochemical devices (fuel cells and electrolysis cells). 2 primary claims, 8 depending claims, 5 figures.

A water treatment system with a photocatalytic nanocomposite sheet, an adsorbent layer, and a fibrous filter, wherein the photocatalytic nanocomposite sheet comprises polymethylmethacrylate and silver phosphate, the adsorbent layer comprises plasma activated carbon nanotubes, and the fibrous filter is a composite of polymethylmethacrylate, polyvinylidene fluoride, and polyvinylpyrrolidone polymer fibers, with carbon nanotubes that are dispersed within the polymer fibers and silver nanoparticles that are deposited on the polymer fibers. Various embodiments of the water treatment system and methods of fabricating the photocatalytic nanocomposite sheet, the adsorbent layer, and the fibrous filter are also provided.

The present invention relates to a method of preparing a photocatalyst composite nanofiber using coaxial electrospinning and a photocatalyst composite nanofiber prepared by the same method, and when the photocatalyst composite nanofiber is prepared by such a method, noble metal particles are located on the fiber surface and rGO surrounds the nanofiber, thereby improving photocatalytic performance and reducing costs, and being capable of being applied in various industrial fields for antibacterial treatment and deodorization.

The present invention is a catalyst for a photocatalytic reaction for the production of hydrogen by hydrolysis and a preparation method thereof. A preparation method of a catalyst for a photocatalytic reaction for the production of hydrogen by hydrolysis, comprising: after dispersing the ZnO nanorods into a solvent, adding TiCl.sub.4 and water, followed by hydrothermal treatment, washing and drying to obtain a ZnO@TiO.sub.2(B) nanoflower catalyst, i.e. the catalyst. According to the present invention, a catalyst for a photocatalytic reaction for the production of hydrogen by hydrolysis and a preparation method thereof, embedding ZnO nanocrystals into a TiO.sub.2(B) lattice can improve the stability of photocatalytic hydrogen production.

The present disclosure relates to nanocomposites of CuO/Cu.sub.2O and continuous flow solar reactors. The nanocomposites can be utilized as a photocatalyst and can be incorporated into photoelectrochemical devices. The described devices, systems, and methods can be used for converting CO.sub.2 into one or more alcohols and other small organics with the use of solar energy and electricity. Other embodiments are described.

The invention relates to a catalytic assembly for carrying out a heterogeneous catalysis reaction in a given temperature range T, characterized in that it comprises the association of at least one catalytic compound capable of catalyzing said reaction in the temperature range T and of a ferromagnetic material in the form of micrometric particles and/or wires, said ferromagnetic material being capable of being heated by magnetic induction by means of a field inductor. The invention also relates to the use of said catalytic assembly for implementing a heterogeneous catalysis reaction such as a methanation reaction.

A metal ratio inspection method for inspecting a metal ratio of a thermally sprayed composite material containing at least one metal and at least one ceramic, the method includes: an imaging step (step S11) of imaging the thermally sprayed composite material while irradiating the thermally sprayed composite material with imaging light; and an estimating step (step S12) of estimating a metal ratio of the thermally sprayed composite material based on a luminance distribution of the image of the thermally sprayed composite material obtained in the imaging step.

A member for a metal oxide nanofiber based gas sensor can include a metal nanoparticle catalyst and can be formed to be functionalized by binding the metal nanoparticle catalyst and an alkali or alkaline earth metal through electrospinning and heat treatment processes. The member can detect a trace amount of a gas with high selectivity and ultra-high sensitivity by uniformly binding the alkali or alkaline earth metal and the metal nanoparticle catalyst through electrospinning and high-temperature heat treatment.

The present disclosure provides a preparation method of an efficient and stable catalytic membrane based on a multi-scale hollow molecular sieve fiber, and belongs to the technical field of molecular sieve preparation. The preparation method includes the following steps: mixing a silicon source, an aluminum source, water, and an organic template, and stirring; heating, and adding deionized water; conducting a reaction by hydrothermal synthesis; conducting centrifugation on an obtained suspension, loading by mixing an obtained powder free of a mother liquor with an iron source, and washing and drying; dissolving a treated powder in anhydrous ethanol and conducting an ultrasonic treatment; adding a surfactant to an obtained dispersion, stirring, and conducting the ultrasonic treatment; and conducting coaxial electrospinning and calcination in sequence to obtain the membrane based on a hollow molecular sieve fiber.