65results about How to "Good catalytic activity at low temperature" patented technology

The invention relates to a honeycomb metal network carrier catalyst for catalyzing and reducing nitrogen oxide, and relative preparation, used in vehicle tail gas purification technique. The invention comprises metal carrier and catalyst, characterized in that the catalyst is load-type catalyst, the catalyst carrier is honeycomb metal network carrier carrying gamma-Al2O3 coat, referring coat mass, the content of TiO2 is 14.0-20.0wt% and the content of CeZrO is 3.0-6.0wt%, and referring to catalyst mass, the content of active component palladium is 0.1-1.0wt%, and the preparation comprises that preparing TiO2 gel, preparing TiO2 coat at the face of carrier, loading cerium zirconium oxide on carrier, leading in catalyst active component palladium. The invention has the advantages that the invention can improve mass transfer and heat transfer in catalyst, the catalyst has higher catalysis activity in low-temperature oxygen-abundant condition, wide active temperature window, simple preparation and low cost.

The invention relates to a rare-earth modified sulfur-resisting low-temperature SCR catalyst and a preparing method thereof. The catalyst is composed of a carrier, an activity component and a performance additive component. The preparing method of the catalyst comprises the step one of catalyst powder preparation and the step two of pug treatment and formation. A certain amount of rare earth oxide is doped, acid site strength of the surface of the catalyst is improved, the number is increased, low-temperature activity of the catalyst is improved, a temperature window is broadened, the NOx removing rate of the catalyst within the range of 170-400 DEG C is kept to be 95% or above, and the application field of the denitration technology is broadened; meanwhile, production raw materials of the catalyst are easy to obtain, the preparing process is simple, and industrial production and market popularization can be achieved easily.

The invention specifically relates to a regenerable heterogeneous Fenton catalyst, and a preparation method and application thereof, which belongs to the technical field of industrial catalysts. The catalyst provided by the invention uses commercial zeolite as a carrier and is prepared through the following steps: surface modification of the carrier with a high polymer; loading of an active component Fe or Co; and roasting so as to form an iron or cobalt compound-valence oxide on the surface of zeolite. The catalyst shows high-efficiency degradability to industrial intractable organic waste water containing phenols, dyes or the like, and the degradation rate of organic matters in waste water is up to more than 90% at room temperature (less than 30 DEG C) under an almost neutral condition (wherein a pH value is in a range of 6 to 8); and the catalyst has good regeneration performance. According to the method, the heterogeneous Fenton catalyst is used for oxidation removal of organic matters like phenols and dyes in waste water, so cost is low and no secondary pollution is produced; and a process for treating waste water with the Fenton catalyst is a promising organic waste water treatment process.

The invention claims a sliver-based bimetallic catalyst, a preparation method and application thereof, wherein the catalyst takes mesoporous molecular sieves such as SBA-15, MCM-41 or MCM-48 and etc. and oxides such as aluminium oxide, silicon oxide and cerium oxide and the like as carriers; the active ingredient of the catalyst is sliver, the second ingredient is M which is any one of transition metal selected from the group consisting of Cu, Co, Ce and Mn and etc. The synthetic method of the catalyst is characterized in that the operation is simple and easy, the synergistic effects of selected different transition metals selected to the sliver type are different, taking copper as an example, when Ag: Cu is more than 1: 2 but not more than 2: 1, the catalyst presents an obvious synergistic effect between metals, and the catalytic oxidation reactivity of volatile organic contaminant (VOC) is obviously improved. Simultaneously, the sliver-based bimetallic catalyst provided by the invention has the advantages that the price of transition metal which is used is low by comparing with platinum, palladium and gold and etc., the resource of the transition metal is rich, the catalyst is suitable for mass production and industrial application and the application value and the application prospect are good.

The invention provides a platinum/cerium aluminum-molecular sieve catalyst for catalytic oxidation of an ammonia gas. Cordierite ceramic is utilized as a carrier for the platinum/cerium aluminum-molecular sieve catalyst, the surface of the carrier is coated with a catalyst layer, and the catalytic active site of the catalyst layer consists of a noble metal platinum, a cerium-aluminum composite oxide and a neodymium-modified molecular sieve; the mass ratio of the cerium-aluminum composite oxide to the neodymium-modified molecular sieve to the noble metal platinum is (20-80):(20-80):(0.01-0.1), and the mass ratio of cerium oxide and aluminum oxide in the cerium-aluminum composite oxide is (1-3):(1-5); the mass ratio of neodymium oxide and a molecular sieve in the neodymium-modified molecular sieve is (1-10):(90-100). The platinum/cerium aluminum-molecular sieve catalyst is also capable of achieving wide low-temperature activity window, good catalytic activity and high selectivity even at a high space velocity (SV), and is capable of effectively restraining generation of secondary pollutants of N2O, NO and NO2. The invention further provides a preparation method of the platinum/cerium aluminum-molecular sieve catalyst.

The invention discloses a preparation method of a Cu-Ce-La-SSZ-13 molecular sieve catalyst. The method is characterized in that a molecular sieve structure guide agent is formed jointly through addingCe(NO)3.6H2O and La(NO)3.6H2O after preliminary complexation of Cu<2+> and tetraethylene pentamine, and a Cu-Ce-La-SSZ-13 molecular sieve is synthesized through one step. The preparation method disclosed by the invention is simple; lanthanum as a third active component is introduced, so that the stability of the lanthanum in the molecular sieve and the oxidation capacity of the molecular sieve are improved. The Cu-Ce-La-SSZ-13 molecular sieve prepared by the preparation method disclosed by the invention has excellent low-temperature catalytic activity, the SCR activity reaches above 90 percent at a temperature of 180 DEG C, and meanwhile, the water resistance and the sulfur resistance are improved.

The invention discloses a method for removing NOx in sintering flue gas through a low-temperature SCR (Selective Catalytic Reduction) catalyst based on a metallurgy coke nut adsorbent. The method comprises the following steps: (1) smashing and sieving defective coke to obtain metallurgy coke nut; (2) cleaning the metallurgy coke nut with clear water, draining, and placing the drained metallurgy coke nut into a drying oven of which the temperature is 120 DEG C to perform constant-temperature drying for 2 hours; (3) performing high-temperature water vapor activation on the dried metallurgy coke nut; (4) selecting V2O5 to serve as an active component of the low-temperature SCR catalyst, selecting an ammonium metavanadate solution to serve as a precursor of V2O5, and soaking the metallurgy coke nut into a solution of which the V2O5 concentration is 6 percent and a solution of which the V2O5 concentration is 10 percent respectively for 16 hours through a soaking process to obtain a metallurgy coke nut low-temperature SCR de-nitration catalyst; (5) taking out a sample, placing the sample into an air blast drying box to dry for 3 hours, then placing the sample into a resistance furnace, and calcining in a nitrogen atmosphere at the temperature of 600 DEG C for 2 hours in order that the ammonium metavanadate is fully decomposed to obtain a V2O5-loaded modified metallurgy coke nut catalyst.

The invention provides an SCR (Selective Catalytic Reduction) catalyst which is prepared from the following raw materials in parts by weight: 85-95 parts of TiO2, 3-5 parts of WO3, 1-3 parts of V2O5, 5-8 parts of glass fibers, 5-10 parts of ammonia water, 8 parts of CMC, 50 parts of ionized water and 6 parts of RP-CHOP functional fibers. The catalyst provided by the invention has the characteristics of high low-temperature activity and high denitration efficiency and also has excellent compressive property and wear resistance. The invention also provides a method for preparing the catalyst.

The invention relates to a catalyst for catalyzing and purifying tail gas of engine, and relative preparation, used in vehicle tail gas purification technique. The invention comprises that carrier and catalyst active component, characterized in that the catalyst uses gamma-Al2O3 as carrier, adhered with mixed oxide coat of titania and cerium zirconium, the invention loads active component palladium via immerge method, referring the carrier mass, the content of TiO2 is 14.0-20.0wt% and the content of CeZrO is 3.0-6.0wt%, referring to catalyst mass, the content of active component palladium is 0.1-1.0wt%. And the preparation comprises that preparing titania gel, preparing titania coat on the face of Al2O3, preparing cerium zirconium gel, loading cerium zirconium oxide on the carrier adhered with titania coat, and leading in active component palladium. The invention has the advantages that under over-oxygen condition, in low-temperature, the invention has strong activity for removing nitrogen oxide, with simple production.

The invention discloses a denitration catalyst, and a preparation method and application thereof, and relates to the technical field of denitration catalysts. The denitration catalyst is a low-temperature SCR denitration catalyst taking red mud as a main raw material. The denitration catalyst is prepared through roasting 45-80 parts of red mud, 10-40 parts of fly ash, 3-25 parts of perovskite typecomposite metal oxide and 0.5-5 parts of pore-enlarging agent. The reaction temperature required by the denitration catalyst is relatively low, and the denitration catalyst has good low-temperature catalytic activity. Besides, the denitration catalyst is large in specific surface area, developed in void structure and good in sulfur resistance, and the production cost of the denitration catalyst is reduced under the condition that the red mud is effectively recycled.

The invention discloses a preparation method and application of a copper-cobalt composite oxide catalyst, belonging to the technical field of preparation of composite catalysts. The preparation methodcomprises the following steps: mixing and grinding a copper salt, a cobalt salt and a complexing agent to form a dry material; and roasting the dry material under the roasting condition that a temperature is raised to 300-550 DEG C at a heating rate of 10 DEG C/min, then performing roasting for 1-2 hours at a constant temperature of 300-550 DEG C, and taking out the dry material after the temperature drops to a normal temperature after roasting is finished so as to obtain the catalyst, wherein a molar ratio of the copper salt to the cobalt salt to the complexing agent is 1: 2: (0-5), and thecomplexing agent is oxalic acid. The copper-cobalt composite oxide catalyst prepared by the method disclosed by the invention shows good activity in catalytic combustion of toluene volatile organic compounds at low temperature. According to the method, the copper-cobalt composite oxide catalyst is prepared through a grinding method, so preparation process is simple, conditions are mild and are easy to control, safety and environmental protection are achieved, repeatability is good, and great industrial application value is achieved.

The invention discloses a low-temperature coke oven flue gas desulfurizing and denitrifying process. The low-temperature coke oven flue gas desulfurizing and denitrifying process comprises the following steps: firstly, preparing an SCR catalyst, wherein the catalyst is obtained by preparing clay, polymethyl methacrylate and sodium silicate into a carrier and then loading metal oxides of manganese and cerium, and the catalyst has good catalytic activity at low temperature and a large adsorption rate; then in a desulfurizing and denitrifying step, dedusting coke oven flue gas first and then injecting the coke oven flue gas into a desulfurizing adsorption zone for desulfurizing, wherein a desulfurized product is adsorbed by the SCR catalyst, and the catalyst can be recycled after desulfurization regeneration and activation treatment; injecting the dedusted and desulfurized coke oven flue gas into an SCR reaction zone, injecting cyanuric acid and ammonia gas into the SCR reaction zone in a mixing manner, contacting with the coke oven flue gas and the SCR catalyst, denitrifying, and discharging the desulfurized and denitrified flue gas after the catalyst is recycled. The low-temperature coke oven flue gas desulfurizing and denitrifying process has high desulfurizing and denitrifying efficiency and high SCR catalyst adsorbing rate, and can be recycled, so that the cost is reduced.

The invention discloses a VOCs catalytic oxidation catalyst and a preparation method and application thereof. According to the catalyst, a hierarchical pore ZSM-5 molecular sieve serves as a carrier, transition metals Cu and Mn serve as active components, one or more of Ce, Nd and Co serve as auxiliaries, and the active metals and the auxiliaries are loaded into pore channels of the hierarchical pore molecular sieve through a step-by-step impregnation method; and steam treatment is then conducted to obtain the high-dispersion transition metal composite oxide catalyst. The well-developed pore channel structure of the hierarchical pore ZSM-5 molecular sieve provides the highly-dispersed surface for the active metal and the auxiliary, and the acidic center on the surface of the ZSM-5-molecular sieve provides the synergistic effect for the catalytic oxidation of VOCs, such that the VOCs catalytic oxidation activity of the catalyst is significantly improved; the catalyst is simple to prepare, adopts cheap raw materials, is suitable for mass production and industrial application, and has better application value and prospect.

The invention discloses a low-temperature SCR denitration catalyst and a preparation method thereof, and application of the catalyst to a low-temperature SCR flue gas denitration system. The preparation method comprises the following steps: weighing graphite oxide, putting the weighed graphite oxide in a beaker, adding deionized water, and carrying out ultrasonic dispersion to obtain a graphene oxide dispersion liquid; adding KMnO4 and L-ascorbic acid into the graphene oxide dispersion liquid, carrying out stirring at room temperature, centrifuging a reaction liquid, washing the obtained precipitate with deionized water and absolute ethyl alcohol, and drying the precipitate in a blast drying oven; and carrying out low-temperature pre-oxidation treatment on a sample in the blast drying ovento obtain the low-temperature SCR denitration catalyst. The preparation method is simple, and the prepared catalyst is fine in particle, large in specific surface area, good in dispersity, high in purity and good in low-temperature catalytic activity.