43results about How to "Promote catalytic oxidation" patented technology

The invention relates to a method for producing caprolactam by methylbenzene, which comprises the following processes of oxidation, esterification, hydrogenation, distillation, amidation, hydrolyzing and refining, wherein in the oxidation process, the methylbenzene is completely converted into benzoic acid by adopting an ester solvent; in the esterification process, the benzoic acid dissolved in ester reacts with alcohol to form corresponding benzoate; in the hydrogenation reaction, a benzene ring of the benzoate is hydrogenated till saturation to form cyclohexanecarboxylate in a fixed bed reactor, and the cyclohexanecarboxylate enters the amidation process; and in the amidation process, the cyclohexanecarboxylate reacts with nitrosyl sulfuric acid, the reaction product is subjected to hydrolyzing rearrangement in the sulfuric acid to form the caprolactam by refining. In the method, the conventional rectification of the benzoic acid is changed into the rectification of the benzoate, agranular catalyst replaces the original powder palladium-carbon catalyst, the processes of catalyst sedimentation, centrifugal separation and the like are reduced, the generation of ammonium sulfate is reduced, and dimethyl sulfate serving as a by-product is produced simultaneously.

The invention relates to the technical field of tail gas treatment, and discloses an environment-friendly automobile tail gas treatment system and a treatment method, wherein the environment-friendly automobile tail gas treatment system includes a cylinder body, one end of the cylinder body is connected with an intake pipe, and the cylinder body The other end of the cylinder is connected with an outlet pipe, and a honeycomb-shaped first carrier is installed in the cylinder for catalytic reduction of automobile exhaust, and a second carrier is installed in the cylinder for catalytic oxidation of automobile exhaust. A carrier is close to the air inlet pipe, and the second carrier is close to the air outlet pipe. In the environment-friendly automobile exhaust treatment system, when the exhaust gas enters the second carrier, the oxidation substrate in each oxidation unit in the second carrier will vibrate under the influence of the exhaust gas flow, and this vibration is easy to oxidize the solid particulate matter on the substrate Shock off, so as to avoid a large amount of solid particles from accumulating on the oxidation substrate, which is helpful to the catalytic oxidation of the exhaust gas by the second carrier.

The invention provides a nano cerium manganese oxide / activated carbon composite material for oxidation of formaldehyde at room temperature and a preparation method thereof. The method includes: firstly subjecting activated carbon to acid treatment, then using a nitrogen-containing compound to perform nitrogen doping treatment, conducting sol-gel heat treatment, then introducing nitrogen element tothe activated carbon surface to obtain mesoporous activated carbon and increase the surface polarity of activated carbon greatly at the same time, and then loading a nano cerium manganese oxide evenly and stably on the activated carbon surface by in-situ co-precipitation method. Compared with the existing catalysts, the nano cerium manganese oxide / activated carbon composite material can expose more active sites, and has good hydrophobic properties, improves the catalytic oxidation activity of formaldehyde, can be used directly or used after simple molding, is used for the air purification field, domain. The preparation method has the advantages of simple steps, convenient operation, and strong practicality.

The invention discloses an alcohol-based fuel and a preparation method therefor and belongs to the technical field of fuels. According to the method, a catalysis activator with homogeneous-dispersed nanoparticles is formed through dissolving AEO-3 in n-octane, then, adding methanol and formamide to form a microemulsion and then adding cerous nitrate nanoparticles, and thus, pollutants discharged from combustion are reduced; an antiknock additive is synthesized by a Mannich reaction through providing phenyl by o-methylphenol and providing hydroxyl, amino, formaldehyde base and the like by diethylenetriamine, and thus, the stability and safety of combustion of the alcohol-based fuel are improved; and the intersolubility among all ingredients of the alcohol-based fuel is promoted through adding petroleum ether, so that the activator can plays a full role during the combustion of the fuel, the activation energy of C-H bonds of fuel molecules are lowered, and the quantity of activated molecules is greatly increased. According to the alcohol-based fuel and the preparation method therefor, the problems of the current alcohol-based fuels that the combustion is insufficient and a large number of hazardous and noxious substances are generated after combustion are solved.

Disclosed is a method for applying a V2O5 / carbon material catalyst to remove mercury in flue gas, which comprises: feeding the catalyst into a fixed bed reactor, controlling the reaction temperature at between 120 and 180DEG C, and inputting atmospheric mercury-bearing flue gas, wherein, the concentration of mercury is 0.5 to 3070mu g / m3, and the air speed ranges from 10000 to 100000h-1; and the catalyst is the V2O5 / carbon material catalyst, and has the compositions, in weight percentage: 90 to 99.5 percent of carbon material, and 0.5 to 10 percent of vanadium oxide by taking V2O5 as a unit of measurement. The invention has the advantages of rather high catalytic oxidation removal capability to mercury, reducing the running cost and solving the secondary pollution.

The invention relates to a sludge treatment equipment adopting catalytic wet oxidation method, relates to the technical field of sludge treatment equipment, including a flushing high-temperature autoclave and a sealing cover, an electric furnace is arranged on the left side of the front of the high-temperature autoclave, and An oxygen tank is externally connected to the left, and the sealing cover is placed on the upper end of the high-temperature autoclave, and the sealing cover and the high-temperature autoclave are connected by bolts, and an air inlet pipe is inlaid on the upper right side of the oxygen tank. The beneficial effects of the present invention are: the stirring rod can be driven to stir the sludge by using the rotating shaft to rotate in the high-temperature autoclave, so that the catalyst and the sludge can be mixed quickly and uniformly, and the sludge can be fully and quickly contacted with oxygen. It can speed up the catalytic oxidation of sludge, and at the same time make the sludge contact with heat, so that the sludge can be processed quickly, and the organic matter and reducing inorganic matter in the sludge can be quickly oxidized into carbon dioxide, water and a small amount of solid residue.