95 results about "Ternary catalyst" patented technology

The invention belongs to the field of catalytic hydrogenation reaction, and provides a method for preparing pentanediol from furfural. The method comprises the following steps: in the presence of a non-noble metal catalyst and isopropanol, contacting furfural with hydrogen for hydrogenation reaction to form a reaction product containing pentanediol; wherein the non-noble metal catalyst is a cobalt-copper binary catalyst and / or a cobalt-zirconium-copper ternary catalyst, and the non-noble metal catalyst is prepared by the method comprising the following steps: (1) carrying out precipitation reaction on a metal source and a precipitator in water, and aging to obtain a solid-liquid product; and (2) carrying out solid-liquid separation on the solid-liquid product, and washing, drying and calcining the obtained solid. According to the method, pentanediol can be prepared under the condition that the low-cost catalyst is adopted, and the yield of pentanediol can be increased.

An internal combustion engine includes a three-way catalyst provided in an exhaust path, an upstream-side air-fuel ratio sensor provided on the exhaust upstream side of the three-way catalyst, and a downstream-side air-fuel ratio sensor provided on the exhaust downstream side of the three-way catalyst. The CPU executes a correction process of making a correction of addressing an output deviation of the upstream-side air-fuel ratio sensor based on an output of the upstream-side air-fuel ratio sensor and an output of the downstream-side air-fuel ratio sensor in a case where the output of the downstream-side air-fuel ratio sensor indicates a value near the stoichiometric air-fuel ratio during the execution of air-fuel ratio control of controlling the air-fuel ratio of an air-fuel mixture based on the output of the upstream-side air-fuel ratio sensor such that the air-fuel ratio of the air-fuel mixture is an air-fuel ratio near the stoichiometric air-fuel ratio.

The invention relates to the technical field of catalyst preparation, and provides a Co-loaded ferronickel-based three-way catalyst, a preparation method and application, and the preparation method of the Co-loaded ferronickel-based three-way catalyst comprises the following steps: S1, adding a divalent cobalt compound solution into a liner of a hydrothermal kettle; s2, a foamed ferronickel substrate is added into the divalent cobalt compound solution for a hydrothermal reaction, washing and drying are carried out after the reaction is finished, and a Co / NiFe (at) INF electrode is obtained; and S3, oxidizing and calcining the Co / NiFe (at) INF electrode to obtain the Co / NiFeO (at) INF electrode. Compared with the prior art, the preparation method of the Co-loaded nickel-iron-based three-way catalyst, disclosed by the invention, shows excellent HER activity and excellent stability under a high-current-density alkaline condition.

This invention relates to the field of three-way catalyst processing technology and discloses a three-way catalyst raw material processing device, including a support unit. The support unit includes a stirring shell and a sealing cover, with the end faces of the stirring shell and the sealing cover fitting together. A drive unit, a preliminary stirring unit, and a mixing stirring unit are installed inside the stirring shell and the sealing cover. In this invention, the mixing stirring unit, during the rotation of the drive shaft, drives the bottom drive bevel gear to rotate. The drive bevel gear's side wall meshes with a driven bevel gear, which in turn drives the connected ring and arc-shaped support to rotate synchronously. The rotation of the arc-shaped support causes the connecting shaft and the positioning rod to rotate alternately, thereby stirring the raw material passing through the preliminary stirring unit. This results in more thorough mixing. Furthermore, the raw material passing through the preliminary stirring unit is fed slowly, reducing the occurrence of uneven mixing caused by simultaneous feeding. This method is suitable for widespread application and promotion.

The invention relates to the technical field of natural gas engine control, and discloses an engine aftertreatment catalyst control method and device, electronic equipment and a medium. The method comprises the following steps: acquiring the oxygen storage capacity corresponding to at least one degradation degree three-way catalyst TWC; constructing a first mapping relation between each oxygen storage amount and the opening degree value of the throttle valve under the specific working condition of the engine; constructing a second mapping relation between each oxygen storage amount and the voltage set value of the rear oxygen sensor under the specific working condition of the engine; in the actual operation process of the engine, the degradation degree of the TWC is monitored in real time, and the current oxygen storage amount of the TWC is determined based on the degradation degree; and the emission state of the engine is adjusted based on the current oxygen storage amount, the first mapping relation and the second mapping relation so that the emission state can meet the emission standard. The exhaust emission level of the automobile can be improved, and energy consumption is reduced.

The invention relates to a three-way catalyst as well as a preparation method and application thereof. The three-way catalyst comprises a carrier and an active coating coated on the surface of the carrier, the active coating comprises a bottom layer, a middle layer and an upper layer from inside to outside; the bottom layer comprises an oxygen storage material layer, and the oxygen storage material layer comprises activated aluminum oxide and a rare earth oxygen storage material; the middle layer comprises a Pd coating, and the upper layer comprises a Pt-Rh-Ru coating. The three-way catalyst provided by the invention adopts a three-layer coating structure, so that the poisoning effect of sulfur in gas on noble metal palladium is effectively reduced, and the performance and durability of the catalyst are greatly improved. Activated aluminum oxide and a rare earth oxygen storage material are selected as bottom layer materials of the catalyst, the oxygen storage performance of the catalyst is greatly improved, and the catalyst has obvious performance advantages when coping with engine loads with large air-fuel ratio fluctuation.

Provided is a catalyst temperature calculation device capable of calculating the temperature of a three-way catalyst having an oxygen storage capability with high accuracy. This catalyst temperature calculation device is provided with: an estimation unit that estimates, on the basis of the amount of heat of exhaust gas discharged from an engine, the temperature of a three-way catalyst that has oxygen storage capacity and purifies the exhaust gas from the engine; and a correction unit that corrects the temperature of the three-way catalyst estimated by the estimation unit on the basis of the ammonia concentration in the exhaust gas discharged from the three-way catalyst into which the exhaust gas having a rich air-fuel ratio flows.

The invention relates to the technical field of motor vehicle tail gas after-treatment, and discloses a three-way catalyst conversion efficiency online detection method based on infrared spectroscopic analysis. The method comprises the following steps: continuously acquiring and fusing infrared spectrum and working condition data by establishing a data channel, constructing a spectral feature domain representing the intrinsic state of the catalyst, and mapping real-time data into a feature vector sequence; the state of the active site on the surface of the catalyst is estimated by analyzing sequence change, and then the real-time activity degree of each chemical reaction path is deduced. The pollutant conversion amount is distributed based on the path activeness weight, the contribution of each path is calculated, the instantaneous conversion efficiency is summarized and evaluated, and finally an activity attenuation track is drawn and a diagnosis instruction is triggered. According to the technology, transformation from macroscopic efficiency monitoring to microscopic reaction path analysis is realized, the root of efficiency reduction can be accurately positioned, and early warning is realized.

The vehicle (100) comprises at least one oxygen sensor (116) positioned downstream the TWC (106) in the exhaust conduit (104) of the vehicle (100). The controller (110) configured to receive signal from the oxygen sensor (116), characterized in that, determine a time duration between two points of the received signal, process the time duration using a computational module (120) and calculate a result value. The controller (110) further configured to determine health (ageing / deterioration) of the TWC (106) based on the comparison of the result value and a threshold value. The two points are any two selected from a group comprising a maximum point (212) of the signal, a switching point (214) of the signal, and a minimum point (216) of the signal. The present invention does not require any hardware changes or additional cost compared to the previous state of arts.

The invention relates to the technical field of tail gas purification, in particular to a front-section three-way catalyst, a three-way catalyst system and a preparation method of the three-way catalyst system. The front-section three-way catalyst comprises a front-section catalyst matrix and a front-section molecular sieve coating, and the front-section molecular sieve coating comprises a first molecular sieve coating, a second molecular sieve coating and a third molecular sieve coating which are stacked and used for adsorbing nitrogen oxides; the second molecular sieve coating comprises a second front molecular sieve coating for adsorbing hydrocarbon and a second rear molecular sieve coating for adsorbing carbon monoxide, and the third molecular sieve coating comprises a third front molecular sieve coating for adsorbing hydrocarbon and a third rear molecular sieve coating for adsorbing carbon monoxide; the front-section molecular sieve coating with a three-layer structure can be used for enriching nitrogen oxide, hydrocarbon and carbon monoxide in a partitioned manner, so that the reaction efficiency of the three-way catalyst can be improved.

The invention provides a graphite core column for high-temperature and high-pressure synthesis of high-thermal-conductivity diamond and a preparation method, the graphite core column is of a three-layer concentric cylinder structure, and the graphite core column is sequentially composed of a nitrogen removal core layer, a catalytic reaction layer and a sealing pipe layer from inside to outside. The nitrogen removal core layer forms an active defense system, Ti / Zr elements located in the core react with nitrogen to produce stable nitrides, nitrogen impurities are firmly captured and fixed to the nitrogen removal core layer, and the diamond growth environment of the catalytic reaction layer is purified; and the catalytic reaction layer is formed by mixing a Ni-Mn-Cu ternary catalyst and graphite. The catalyst system ensures that the dynamic processes of dissolution and precipitation of the carbon source in the catalyst are consistent, and stable growth of diamond single crystals is facilitated; the outer-layer sealing pipe graphite is used for sealing an internal reaction system and preventing external pollution. The three layers of structures perform their own functions and cooperate with one another, impurity removal, growth and pressure maintaining are integrally designed, and the system solves the three core problems of nitrogen pollution, uneven growth and pressure fluctuation in synthesis of the high-thermal-conductivity diamond.

The present disclosure provides for methods of improving the performance of a combustion engine after-treatment device, such as particulate filters and / or three-way catalyst systems, over its useful life by using a lubricating oil composition including one or more base oils of lubricating viscosity and an additive package with increased amounts of least one oil-soluble silicon-containing compound.

This invention provides a three-way catalytic converter for enhanced automotive exhaust purification. The invention also provides a method for preparing the three-way catalytic converter. The three-way catalytic converter prepared according to the method has three coatings: upper, middle, and lower. The middle coating is a Cu-Ni-La solid solution, which acts as a physical barrier to isolate the palladium in the lower coating and the rhodium in the upper coating. The three-way catalytic converter of this invention has enhanced CO, NOx, and HC conversion capabilities, making it suitable for use in automotive exhaust purification.

The present invention relates to a method for manufacturing an exhaust gas-purifying catalyst, wherein an active precious metal component is prevented from being sintered in a high-temperature aging condition. More specifically, the present invention relates to a manufacturing method in which a precious metal component within micropores of a support of a three-way catalyst for purifying exhaust gas is grown to the size of the micropores and thus is prevented from escaping to the outside of the micropore, and the chemical bond of the active precious metal component to the inner surface of the micropores is strengthened, whereby the precious metal component is repressed from being sintered in a high-temperature aging condition, and a catalyst, manufactured thereby, for purifying exhaust gas, wherein the active precious metal component is minimally sintered.

Methods for thermal control, including: Determine whether a catalytic converter (18) is active; Determine whether a catalyst (20) is active for selective catalytic reduction (SCR); Adjusting the air-fuel ratio of a machine (14) for operation at a stoichiometric ratio and retarding the ignition spark of the machine (14) when the catalytic converter (18) is not active; and Perform fuel injection when the catalytic converter (18) is active and the SCR catalyst (20) is not active; characterized by the fact that the catalytic converter (18) is a three-way catalyst (18); wherein, based on a first temperature of the catalytic converter (18) and a first active volume of the catalytic converter (18), it is determined whether the catalytic converter (18) is active; wherein, based on a second temperature of the SCR catalyst (20) and a second active volume of the SCR catalyst (20), it is determined whether the SCR catalyst (20) is active, wherein the second temperature is an average temperature determined as a weighted mean of temperatures T1 and T2 measured upstream and downstream of the SCR catalyst (20) according to the equation WA = x * T1 + (x-1) * T2, where WA is the weighted mean and x is a calibrated value between 0 and 1; and wherein the fuel injection is carried out by a post-fuel injection and / or by direct injection of fuel into an exhaust system (16) of the machine (14).

The invention discloses a parameter correction system and method for low emission. The system comprises a gas machine aftertreatment device and an electric control unit. The gas machine post-treatment device comprises a first three-way catalyst converter, a second three-way catalyst converter and a particle trap; a temperature sensor is arranged between the first three-way catalyst converter and the second three-way catalyst converter, and a nitrogen oxide sensor is arranged between the second three-way catalyst converter and the particle trap; the temperature sensor and the nitrogen oxide sensor are electrically connected with the electric control unit respectively; the gas machine post-processing device is used for acquiring a first temperature and an actual oxygen concentration through a temperature sensor and a nitrogen oxide sensor and sending the first temperature and the actual oxygen concentration to the electric control unit; and the electronic control unit is used for correcting the original engine parameters of the engine and the sensor value of the nitrogen oxide sensor based on the first temperature and the actual oxygen concentration so as to optimize the performance and the fuel efficiency of the engine. According to the invention, the accuracy of emission control and the reliability of the system can be improved.

A natural gas combustion system and its burner assembly for simulating the working environment of a three-way catalytic converter include an intake assembly, a combustion assembly, a cooling assembly, and a reaction assembly. The intake assembly includes a gas bus and an air bus. The combustion assembly includes a primary combustion mechanism and several secondary combustion mechanisms. It also includes a combustion process, comprising a primary combustion stage and a secondary combustion stage. Furthermore, it includes a regulating component. When the regulating component is located on the gas branch line, it sequentially includes a pneumatic valve, a filter, a flow meter, a check valve, and a flame arrester. When the regulating component is located on the air branch line, it sequentially includes a filter, a flow meter, and a check valve. This invention employs a multi-stage burner to perform multi-stage combustion of natural gas to simulate the reaction environment during normal operation of a three-way catalytic converter. It also features a complete automated closed-loop system for dynamic adjustment, significantly improving experimental accuracy through the air-fuel ratio meter and air-fuel ratio control unit of each burner stage.

Systems and methods are disclosed for the removal of hydrocarbons, nitrogen oxides, and carbon monoxide. The systems are further configured to reduce ammonia formulation while increasing the removal of ammonia that is formulated during the removal of other pollutants. The system includes an upstream three-way catalyst positioned on a first substrate and comprising a bilayer washcoat structure and a downstream catalyst positioned on a second substrate and comprising one of a three-way catalyst or a four-way catalyst.

The application discloses a catalyst for catalyzing polyethylene degradation to prepare ethylene and a preparation method thereof. x In y WO3 / CeO2 catalyst. The application highly disperses active metals in the carrier through simple impregnation, calcination and reduction steps, and the catalyst has the ability of dehydrogenation of noble metals and breaking of carbon-carbon bonds of WO3, realizes efficient conversion of polyethylene into ethylene at a lower temperature, and has a wide application prospect compared with other polyethylene ethylene systems.

The invention discloses a three-way catalyst as well as a preparation method and application thereof. The three-way catalyst comprises a carbon carrier, and a noble metal, a transition metal and a rare earth metal which are loaded on the carbon carrier, the noble metal is selected from Pt and Pd, the transition metal is selected from Fe, Co or Ni, and the rare earth metal is selected from Ce or La. The invention provides application of the three-way catalyst in magnetic field driven room-temperature CO oxidation reaction. The three-way catalyst has the high activity of precious metal, the oxygen storage capacity of rare earth metal and the magnetic response characteristic of transition metal, and under the action of a direct-current magnetic field generated by adding a magnet, the CO oxidation reaction conversion rate can be increased by 10-30 times in a room temperature state.

The application discloses a preparation method and application of an aluminum-copper-based ternary catalyst for carbon dioxide hydrogenation to methanol, and the method is as follows: pseudo-boehmite is dispersed in a solvent, hydrochloric acid is added, copper nitrate and an auxiliary metal precursor are added into the mixture, and then the aluminum-copper-based ternary catalyst is obtained after stirring, aging, drying and calcination. The aluminum-copper-based ternary catalyst preparation method is simple, the carbon dioxide conversion rate is close to the equilibrium conversion rate under high space velocity, the selectivity of methanol is close to 100%, and the catalyst has an industrial application prospect.

The invention discloses a gasoline engine tail gas purification three-way catalyst and a preparation method thereof.The gasoline engine tail gas purification three-way catalyst comprises a carrier and a coating, the carrier is coated with the coating, the coating comprises aluminum oxide, precious metal and a cerium-zirconium composite oxygen storage material, and the cerium-zirconium composite oxygen storage material is prepared from, by mass, 5-10% of aluminum oxide, 5-10% of precious metal and 5-10% of cerium-zirconium composite oxygen storage material. Comprising 40%-70% of zirconium oxide, 20%-50% of cerium oxide, 2%-3% of lanthanum oxide, 2%-3% of yttrium oxide, 1%-2% of phosphorus oxide, 1%-2% of tin oxide and 2%-3% of antimony oxide. Therefore, by using the gasoline engine tail gas purification three-way catalyst, the cost can be reduced, and the catalytic performance of the gasoline engine tail gas purification three-way catalyst is equivalent to that of a Pr / Nd adding scheme.

The invention provides an engine waste gas treatment method and system of a hybrid electric vehicle and the hybrid electric vehicle, and relates to the technical field of vehicle waste gas emission. Under the condition that the main controller determines that the engine of the hybrid electric vehicle is in the preset heat engine steady-state operation working condition, it shows that fuel oil of the hybrid electric vehicle is fully combusted at the moment, waste gas harmful substances discharged by the engine are few, and therefore the first control valve is controlled to be opened, and the second control valve is controlled to be closed; and after being treated by the main three-way catalyst, waste gas generated by the engine is exhausted out of the exhaust port through the first exhaust branch. Due to the fact that harmful substances in waste gas exhausted by an engine are few, the harmful substances in the waste gas can be fully eliminated to meet the emission specification only by treating the waste gas through the main three-way catalyst, the exhausted waste gas does not need to be treated through the auxiliary three-way catalyst, aging of a three-way catalyst in the auxiliary three-way catalyst can be avoided, and the service life of the engine is prolonged. The service life of the three-way catalyst is prolonged, and the cost is saved.

An internal combustion engine control device integrates an oxygen storage amount stored in a three-way catalyst in a period from an integration start position where combustion gas of an internal combustion engine obtained from an air-fuel ratio of exhaust gas starts to change from lean to rich or from rich to lean to an integration stop position where an oxygen concentration that has increased or decreased from before the integration start position is reversed.

The present invention discloses a vehicle exhaust detection device, belonging to the field of automobile detection. The vehicle exhaust detection device comprises: a frame, a cyclone separator fixed to the frame, which is partially conical, has an air outlet at the upper end and an air inlet at the lower end; a detection mechanism connected to the air inlet; a filter connected to the air outlet, having a three-way catalyst fixedly installed therein; a filter box connected to the outlet of the filter, having multiple layers of filter screens installed therein; a waste oil pipeline provided on the outer wall of the cyclone separator; and an evaporation container connected to the end of the waste oil pipeline.

The present application belongs to the technical field of separating and purifying platinum, palladium and rhodium in a three-way catalyst, and particularly relates to a method for separating and purifying platinum, palladium and rhodium in a three-way catalyst by molten salt electrolysis, comprising the following steps: S1 electrolyte system construction: taking the three-way catalyst metal to be purified as an anode, adopting a titanium plate as a cathode, adopting a closed inert protection environment electrolytic cell, and adopting a eutectic molten salt as an electrolyte; S2 step-by-step electrolytic deposition: the first step is platinum deposition; the second step is palladium deposition; and the third step is rhodium separation; and S3 product treatment: the treatment of platinum and palladium products comprises respectively taking out the cathodes in the platinum and palladium deposition stages, stripping the deposits, and then vacuum smelting to obtain platinum and palladium products; the treatment of rhodium products comprises taking out the anode, collecting the anode mud on the surface of the anode, treating to obtain rhodium fine products, and then vacuum smelting the rhodium fine products to obtain rhodium products; the present application can efficiently separate platinum, palladium and rhodium, the products have high purity, and the present application is environmentally friendly.

An exhaust gas component calculation system includes: a three-way catalyst disposed in an exhaust passage of an engine; a gas sensor that is disposed in the exhaust passage upstream of the three-way catalyst and that detects a first correlation value related to the oxygen concentration in the exhaust gas flowing into the three-way catalyst; a NOx sensor disposed in the exhaust passage downstream of the three-way catalyst; and a calculation device provided with: a first calculation unit that calculates a second correlation value relating to the oxygen concentration in the exhaust gas discharged from the three-way catalyst; a second calculation unit that calculates a ratio by referring to a ratio map that defines a ratio of NOx concentration and / or NH3 concentration in the exhaust gas; and a third calculation unit that calculates at least one of the NOx concentration and the NH3 concentration in the exhaust gas discharged from the three-way catalyst, and the ratio map defines a ratio when the second correlation value is an abnormal value with respect to the first correlation value and when the second correlation value is a normal value with respect to the first correlation value.

To provide a catalyst temperature calculation device capable of accurately calculating the temperature of a three way catalyst having oxygen storage capacity.SOLUTION: A catalyst temperature calculation device comprising: an estimation unit configured to estimate a temperature of a three way catalyst that has an oxygen storage capacity and purifies exhaust gas from an engine, based on a heat quantity of the exhaust gas discharged from the engine; and a correction unit configured to correct the temperature of the three way catalyst estimated by the estimation unit, based on an ammonia concentration in exhaust gas discharged from the three way catalyst into which exhaust gas having a rich air-fuel ratio flows.SELECTED DRAWING: Figure 2

The utility model relates to the technical field of natural gas emission processor positioning, in particular to a welding positioning tool and a natural gas emission processor welding manufacturing system. In the welding positioning tool, a first supporting mechanism is installed on a base and located between a second supporting mechanism and a third supporting mechanism, and a first pressing mechanism is installed on the base and arranged to be capable of pressing a three-way catalyst installation module on the first supporting mechanism; the second pressing mechanism is arranged to be capable of pressing the inlet end cone module on the second supporting mechanism and enabling the inlet end cone module to be in butt joint with the inlet side of the three-way catalyst mounting module; and the third pressing mechanism is arranged to be capable of pressing the outlet end cone module on the third supporting mechanism and enabling the outlet end cone module to be in butt joint with the outlet side of the three-way catalyst mounting module. The welding and positioning tool can be specially matched with welding and manufacturing of the welding and positioning tool, the time for welding and manufacturing the natural gas emission processor is shortened, and the production efficiency is improved.