40results about How to "Excellent oxygen storage and release performance" patented technology

The invention discloses a supported silver catalyst for reducing soot particle burning temperature and a preparation method, relating to catalysts. The catalyst comprises an active component and a carrier, wherein the active component is silver; the carrier is cerium dioxide or cerium-based composite oxide; the supported amount of silver is 1-20% of the weight of the carrier; and the cerium-based composite oxide has the general formula of Ce1-xMxOy, and M is rare-earth metal. The carrier is prepared by adding a surfactant as a template into a cerium-based solution through a hydrothermal precipitation method. The catalyst is prepared by introducing a complexing auxiliary agent into a water-based silver nitrate solution, evaporating to dryness and baking. The prepared catalyst has excellent oxidative activity in the process of soot burning, is capable of reducing the temperature of soot T50 from 642 DEG C to about 400 DEG C to reach the operating temperature range of a diesel engine, and reaches and exceeds various types of reported soot particle burning catalysts under the same evaluation conditions.

The invention relates to a mesoporous Co / CeO2 catalyst for a hydrogen preparation reaction by reforming an ethanol vapor and a preparation method thereof. The size of the particle diameter of a mesoporous CeO2 carrier is 12nm or so; the specific surface area of the mesoporous CeO2 carrier can reach up 177m<2> / g; the pore structures of the mesoporous CeO2 carrier are sequentially arranged in a short range; the bore diameters of the mesoporous CeO2 carrier are mainly distributed within 3nm or so; cobalt (Co) taken as an active component is carried on the mesoporous CeO2 carrier; the carrying quantity of CoO2 is 5% to 20% of the mass of the catalyst. The mesoporous CeO2 prepared by using a hard template method has the large specific surface area, the short-range and sequential pore structures and the uniformly distributed bore diameters. The mesoporous CeO2 prepared from mesoporous carbon CMK-3 is mainly used for exposing a high-energy crystal face (110) and has a better oxygen storing / releasing capacity.

The invention discloses preparation of high temperature stability supported cobaltosic oxide based on strong metal and carrier interaction, a product and application. The preparation comprises the following steps: using cobalt nitrate as a cobalt source, sodium carbonate as a precipitator and a cerium-zirconium-aluminum solid solution as a carrier, and using a deposition precipitation method to prepare supported Co3O4; putting cobalt nitrate and the cerium-zirconium-aluminum solid solution into a flask, adding a deionized water soluition, stirring to completely dissolve cobalt nitrate, slowlyadding the sodium carbonate solution into suspension liquid, adjusting the pH to be 9, stirring to carry out ultrasonic oscillation, carrying out filtering, washing and frozen drying on the obtained product, and carrying out calcination at the temperature of 800 DEG C for 3 h to obtain a powdery Co3O4 / CeZrAlO material. After high-temperature processing of 800 DEG C, the catalyst is applied to a propane catalytic combustion reaction, and is still of extremely high activity. The raw materials of the catalyst disclosed by the invention are easily obtained, the technology is simple, the catalyst is high in high temperature stability, and the catalyst has excellent application prospects.

The invention belongs to the technical field of catalyst preparation, and in particular relates to a light-assisted thermal catalyst and a preparation method and application thereof. The catalyst includes a carrier and an active component, the active component includes a first active component and a second active component, the first active component includes Pd and Ce; the second active component includes Mn. The present invention creatively provides a catalyst suitable for light-assisted thermal catalytic combustion. When the light-assisted thermal catalyst is applied to catalytic combustion, the lattice oxygen of the catalyst itself can be activated, the oxygen overflow can be greatly accelerated, and the crystal lattice of the catalyst itself can be activated. Lattice oxygen reacts with methane, CO and other gases to generate carbon dioxide and water. The oxygen in the reactant is continuously adsorbed on the surface of the catalyst to form chemical adsorption oxygen and then converted into lattice oxygen, thereby ensuring the normal progress of the catalytic combustion reaction.

The invention relates to a catalyst for purifying soluble organic matter (SOF) in diesel exhaust and a preparation method of the catalyst. The catalyst is a composite oxide catalyst; especially, the catalyst is formed by mixing oxides of cerium, vanadium and silicon. The catalyst is nano particle and is suitable for processing SOF in the diesel exhaust; the process of catalyzing and oxidizing SOF by using the catalyst is simulated by using a TG-DTA combination method; due to the adoption of the catalyst, SOF can begin to convert at 133 DEG C; the activity on catalytic combustion of SOF is equivalent to that of a loaded noble metal catalyst; the catalyst has good sulfur resistance; and meanwhile, the catalyst does not contain noble metal and is low in cost.