109 results about "Oxygen storage capacity" patented technology

The invention discloses a high-oxygen-storage zirconium solid solution material and a preparation method, and belongs to the technical field of rare earth catalytic materials, and the method comprises the following steps: precursor preparation, ultrasonic dispersion, double-gradient precipitation, ultrasonic aging, solid-liquid separation, three-section roasting and furnace cooling. Through the synergistic effect of double-gradient precipitation and ultrasonic aging, coarse grains and non-uniform particle size distribution are avoided, and the material is not prone to abnormal growth of the grains and structural collapse in long-term high-temperature service. Meanwhile, according to the gradient roasting process, through step-by-step regulation and control of crystal densification and crystal lattice reconstruction, separation of a fluorite phase and a pyrochlore phase easily occurring in traditional low-temperature single-section roasting is reduced, a stable crystal phase structure is maintained, it is ensured that the material can still keep sufficient active surface and pore channel structures under the working conditions of high temperature and thermal shock alternation, and the performance of the material is improved. The oxygen storage capacity and the long-term durability of the catalyst carrier are obviously improved.

The application provides a catalyst for catalytic wet oxidation of tetrabromobisphenol A wastewater, a preparation method and application thereof, and belongs to the technical field of wastewater treatment. The catalyst comprises a main metal oxide and a crystal lattice adjusting metal oxide; the main metal oxide comprises one or more of MnO2, Co3O4, NiO or MoO3, and the crystal lattice adjusting metal oxide comprises an oxide of Ce and / or an oxide of La. The preparation method comprises the following steps: adding main metal salt, crystal lattice adjusting metal salt and citric acid into water, evaporating and concentrating, drying, first calcining, adding sodium hydroxide into water to perform a closed pressurized reaction, washing and drying, second calcining, placing into a nitric acid solution, heat treatment, washing and drying, placing into water with hydrogen peroxide and acetic acid to perform a heat reaction, filtering and drying, and obtaining the catalyst. The catalyst introduces a large number of oxygen defects through a mode of "lattice doping - partial metal removal - lattice distortion", so that the catalyst has a large oxygen storage capacity, can activate the C-Br bond, and can efficiently catalyze the oxidation of tetrabromobisphenol A wastewater.

The invention relates to the technical field of flue gas multi-pollutant synergistic purification, in particular to a preparation method of an ultralow-temperature denitration and decarbonization catalyst and application of the ultralow-temperature denitration and decarbonization catalyst to synchronous removal of nitrogen oxides and carbon monoxide in industrial flue gas. The catalyst is prepared by a two-step method comprising the following steps: S1, dispersing a cerium source and a platinum source in absolute ethyl alcohol, and synthesizing a Pt / CeO2 monatomic catalyst by a hydrogen combustion method; s2, compounding an iron source and Pt / CeO2 through a coprecipitation method, drying and calcining in a nitrogen atmosphere to obtain the Fe-Pt / CeO2 composite catalyst. The key process parameters comprise hydrogen / oxygen flow velocity, calcination temperature and mass ratio of the iron source to the carrier. The synergistic removal efficiency of the catalyst on NOx and CO at the ultralow temperature of 50-120 DEG C reaches 85% or above, and the bottleneck that the low-temperature activity of a traditional catalyst is insufficient is broken through; sulfur resistance and water resistance are remarkably improved through the porous structure and the oxygen storage capacity of CeO2, and the activity retention rate is larger than 90% when SO2 and H2O are contained; the device is suitable for high-efficiency purification of complex flue gas of steel, waste incineration and the like, and meets the policy requirements of pollution reduction, carbon reduction and synergistic interaction.

The application discloses a composite metal catalyst for catalytic degradation of VOCs at low temperature and a preparation method thereof, and belongs to the field of environmental protection catalysis technology. The composite metal catalyst comprises the following components in percentage by weight: 5-25% of a multi-component composite metal oxide, 65-90% of modified mesoporous zeolite, 2-6% of a composite additive, and 1-3% of a high-temperature-resistant binder. The multi-component composite metal oxide is a copper / manganese / cerium / zirconium quaternary composite oxide, and the molar ratio of copper, manganese, cerium and zirconium is 1:(0.8-1.2):(0.5-0.8):(0.2-0.5). The modified mesoporous zeolite is ZSM-5 mesoporous zeolite which is modified by rare earth ions and an amphoteric surfactant. The application adopts the copper / manganese / cerium / zirconium quaternary composite metal oxide as an active component, the introduction of cerium and zirconium forms a solid solution structure, greatly improves the oxygen storage capacity and the redox performance of the active component, and the synergistic effect of copper and manganese and cerium and zirconium significantly reduces the oxidation and decomposition temperature of VOCs.

The invention discloses a sulfur-resistant methane dry reforming catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The catalyst is of a core-shell structure, an active component loaded by a carrier is taken as a core, and SiO2 is taken as a shell. The prepared novel sulfur-resistant methane dry reforming reaction catalyst adopts the NiRu nano-alloy as an active component, and has the characteristics of high catalytic activity and carbon deposition resistance; moO3 and V2O5 are adopted as assistants to adsorb H2S species to promote oxidative removal of the H2S species, and the sulfur resistance is enhanced. CeO2 is adopted as a carrier, the oxidation reduction environment can be adjusted through the oxygen storage capacity of CeO2, H2S species are reduced, metal particles are stabilized, CeO2 and a porous SiO2 shell can form a high-permeability framework structure, sulfur poisoning is delayed through the combined action of multiple components, and wide application prospects are achieved.

A washcoat slurry comprising a platinum group metal (PGM), an oxygen storage capacity (OSC) material, an inorganic oxide support, a polyacrylate, and a solventis disclosed. A method for the manufacture of a catalytic gasoline particulate filter for the treatment of an exhaust gas comprising coating a wall-flow filter substrate with the washcoat slurry is disclosed.

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 method for operating a drive unit for a motor vehicle, which has an exhaust-generating drive unit and an exhaust aftertreatment device for treating the exhaust gas. The method uses an exhaust aftertreatment model and an aging parameter describing the aging of the exhaust aftertreatment device to determine the concentration of an exhaust component present in the exhaust gas downstream of the exhaust aftertreatment device. The aging parameter is determined at times based on the oxygen storage capacity of the exhaust aftertreatment device and at other times based on a damage parameter determined using a temperature model for the exhaust aftertreatment device. The invention further relates to a drive unit for a motor vehicle and a computer program.

A method for the manufacture of a gasoline particulate filter (GPF) for the treatment of an exhaust gas is disclosed. The method comprises (i) forming a washcoat slurry; (ii) coating a wall-flow filter substrate with the washcoat slurry to form a washcoated substrate; and (iii) calcining the washcoated substrate to form a gasoline particulate filter. The washcoat slurry comprises (a) a platinum group metal selected from the group consisting of Pt, Pd, Rh and mixtures thereof; (b) an oxygen storage capacity (OSC) material; and (c) a C2-C6 aliphatic amino acid.

The invention relates to a multi-element rare earth oxide composite catalyst as well as a preparation method and application thereof. The catalyst comprises a carrier and a ternary composite material loaded on the carrier, the mass ratio of the carrier to the ternary composite material is (4: 6)-(7: 3); wherein the carrier is gamma-Al2O3 (aluminum oxide); the ternary composite material is composed of a La2O3 phase and an Nd-O solid solution phase, the proportion of the La2O3 phase is 20%-40%, and the proportion of the Nd-O solid solution phase is 60%-80%. The Nd element in the Nd-O solid solution phase has two valence states of Nd < 3 + > and Nd < 4 + >, and the molar ratio of the two valence states is as follows: Nd < 3 + > accounts for 35%-70%, and Nd < 4 + > accounts for 30%-65%. According to the obtained catalyst, the oxygen storage capacity and thermal stability of the catalyst are optimized by adjusting the La / Nd ratio and Nd valence state distribution, and the catalyst meets various vehicle catalysis requirements.

To provide an engine system in which exhaust emission is improved.SOLUTION: An engine system includes: an engine; a catalyst for purifying exhaust of the engine, and having an oxygen storage capacity; and a control device for executing return rich control of controlling the engine so that an air-fuel ratio of exhaust flowing into the catalyst after return of the engine from fuel cut becomes a rich air-fuel ratio. The control device includes: a calculation part for calculating a maximum oxygen storage possible amount of the catalyst; and an execution period control part for shortening an execution period of the return rich control as the maximum oxygen storage possible amount is smaller.SELECTED DRAWING: Figure 2

The application belongs to the technical field of ship exhaust purification, and particularly relates to a catalyst for decomposing N2O in the exhaust of a ship ammonia internal combustion engine and a preparation method thereof. 3+ By replacing Co ions in the Co3O4 spinel lattice into the lattice, the doping behavior can effectively reduce the number of hydroxyl groups on the surface of the catalyst, significantly weaken the adsorption and combination ability of water molecules, and thus improve the stability of the catalyst in a high-humidity exhaust environment. As an additive, CeO2 uses its oxygen storage capacity to promote the migration and desorption of oxygen species in the reaction, preventing the deactivation of active sites due to oxygen poisoning. The molecular sieve carrier not only provides a highly dispersed surface for the active component to prevent sintering, but also optimizes the adsorption and activation path of N2O and alleviates the poisoning effect of nitrogen-containing intermediate species or impurities in the exhaust on the Co active center during the reaction.

This utility model discloses a flow-diversion and temperature control device for an automotive catalyst oxygen storage capacity evaluation bench system, belonging to the field of automotive catalyst oxygen storage capacity evaluation bench systems. The device includes an execution unit and a control unit. The execution unit is connected to the engine exhaust manifold outlet and includes a flow-diversion mechanism and a temperature control mechanism. When the engine is running, the flow-diversion mechanism diverts the engine exhaust gas source to control the exhaust gas flow rate entering the catalyst body. The temperature control mechanism is located at the inlet of the flow-diversion mechanism and is used to control the temperature of the engine exhaust gas source. The control unit controls the execution unit. This device solves the problem that conventional engine bench systems with single-pipe structures cannot adjust the exhaust flow rate during automotive catalyst oxygen storage capacity evaluation testing, and the problem of catalyst inlet temperature fluctuations caused by long stabilization times before and after rich / lean switching of the excess air coefficient, ensuring the accuracy of oxygen storage capacity testing.

A washcoat slurry comprising a platinum group metal (PGM), an oxygen storage capacity (OSC) material, an inorganic oxide support, a polyacrylate, and a solvent is disclosed. A method for the manufacture of a catalytic gasoline particulate filter for the treatment of an exhaust gas comprising coating a wall-flow filter substrate with the washcoat slurry is disclosed.

The embodiment of the invention provides an oxygen storage capacity detection method and device, electronic equipment, a storage medium and a program product. The method comprises the steps that in a preset first time period, the starting time step when a catalytic converter of an engine starts to store oxygen and the ending time step when the oxygen storage amount of the catalytic converter exceeds a preset oxygen storage amount threshold value are obtained, and the starting time step is earlier than the ending time step; detecting air coefficient deviation information of engine exhaust of the engine when the engine exhaust does not enter the catalytic converter in a second time period from the starting time step to the ending time step; and detecting the oxygen storage amount of the catalytic converter according to the preset oxygen storage amount detection template information, the starting time step, the ending time step and the air coefficient deviation information. The method is used for achieving the effect of efficiently detecting the oxygen storage amount of the catalyst.

The invention provides an engine system shutdown delay determination method which comprises the following steps: in response to an engine shutdown instruction, acquiring an actual EGR (Exhaust Gas Recirculation) rate value before shutdown and an exhaust gas length ratio before shutdown; according to the actual EGR rate value before shutdown, the waste gas length proportion value before shutdown and the real vehicle delay database, the duration of exhausting all waste gas in the first pipeline from the throttle valve is obtained to serve as the first delay duration; the flowing duration of gas in the engine system flowing from a throttle valve to an exhaust port of an engine cylinder is obtained to serve as second delay duration; the first delay duration and the second delay duration are summed, and the initial shutdown delay duration of the engine system is obtained; according to the temperature difference between the current actual temperature of at least one target monitoring object in the engine system and the corresponding preset target temperature and the proportion deviation difference of the current oxygen storage amount proportion of a catalyst in the engine system relative to the preset target oxygen storage amount proportion, the target oxygen storage amount proportion is obtained; and adjusting the initial shutdown delay duration to obtain a final shutdown delay duration.

This invention provides a method for manufacturing an aging catalyst based on an engine bench. The method includes: Step 1, performing state testing and aging tests on a new catalyst on an engine bench; Step 2, comparing whether the test parameters in Step 1 meet the requirements. If not, returning to Step 1 for aging tests; if they meet the requirements, installing it on a vehicle for emission testing; Step 3, if the emission test results do not meet the requirements, returning to Step 1 to continue the aging test; if they meet the requirements, ending the test. The state testing includes a combination or any one of the following: oxygen storage capacity test during the catalyst's ignition phase, emission test during the catalyst's ignition phase, and oxygen storage capacity test under hot conditions. This invention's manufacturing method ensures the engine operates in a richer state, resulting in more stable combustion, shorter aging time, and allows more air-fuel mixture to mix and burn in front of the catalyst during changes in operating conditions, thereby controlling the degree of aging inside the catalyst carrier and making it closer to real-world conditions.

Disclosed herein are mixed oxide compositions containing mixed oxides of cerium, zirconium, and a mixture of iron and strontium. These compositions optionally also may contain additional rare earth dopants. These mixed oxide compositions surprisingly exhibit enhanced low temperature oxygen storage capacity (OSC), even after aging at elevated temperatures. These mixed oxide compositions importantly contain iron and strontium (as oxides) and this mixture of iron and strontium surprisingly provides the mixed oxide composition with improved OSC even after aging at elevated temperatures, in particular improved OSC at lower temperatures. The compositions may be used as catalytic carriers which may be used in gas exhaust purification catalysts.

The invention provides a conversion efficiency diagnosis method and device for a three-way catalyst, a medium and equipment. The method comprises the steps that the running state of a target vehicle is determined; if the running state is a sliding state, calculating sliding accumulation parameters; if the sliding accumulation parameter meets the preset condition, the circulating oxygen storage amount within the first time when the target vehicle exits from the sliding state to the second time when oxygen release is completed is calculated, so that the conversion efficiency of a three-way catalyst of the target vehicle is determined; the operation state of the target vehicle is determined according to the operation state parameters in the operation process of the target vehicle, if the target vehicle is in the sliding state, the sliding accumulation parameters are calculated, and the circulation oxygen storage amount is calculated after the preset conditions are met so as to determine the conversion efficiency of the three-way catalyst of the target vehicle. Therefore, the oxygen storage amount of the target vehicle in the circulation process from oxygen storage to oxygen release can be accurately calculated, then the conversion efficiency of the three-way catalyst is accurately calculated, and the degradation degree of the three-way catalyst of the target vehicle is evaluated more accurately.

The application discloses a kind of high oxygen storage cerium zirconium solid solution materials and preparation method, belong to rare earth catalytic material technical field, the method includes the following steps: precursor preparation, ultrasonic dispersion, double gradient precipitation, ultrasonic aging, solid-liquid separation, three-stage calcination and cooling with furnace.The application avoids coarse grain and uneven particle size distribution through the synergistic effect of double gradient precipitation and ultrasonic aging, so that the material is not easy to occur grain abnormal growth and structure collapse in long-term high temperature service.At the same time, the gradient calcination process controls the crystal densification and lattice reconstruction by steps, reduces the separation of fluorite phase and pyrochlore phase which is easy to occur in traditional low temperature single-stage calcination, maintains the stable crystal phase structure, ensures that the material can still retain sufficient active surface and pore structure under high temperature, thermal shock alternating working condition, significantly improves the oxygen storage capacity and long-term durability of catalyst carrier.

The application discloses a kind of high-efficiency multi-metal catalyst for synthesizing hexafluoropropylene oxide, and belongs to the field of catalyst preparation.The multi-metal catalyst of the application is Cu, Ce, Mo ternary metal catalyst, comprising: 1wt%-5wt% of Cu, 0.5wt%-3wt% of Ce, 0.1wt%-1wt% of Mo and 85wt%-95wt% of phosphoric acid modified mesoporous silica carrier, wherein, Cu is loaded in the form of nanoparticle with particle size of 5-20nm, Ce exists in the form of cerium oxide, and Mo exists in the form of molybdate.The multi-metal catalyst plays catalytic activity through the oxidation activity of Cu 0 , the oxygen storage capacity of CeO2 and the electronic regulation effect of MoO4 2‑ , is suitable for preparing hexafluoropropylene oxide from hexafluoropropylene gas phase oxidation, has high raw material conversion rate, and can reduce reaction temperature.

The invention belongs to the technical field of testing, and particularly discloses a multi-channel catalyst evaluation device and method for oxygen storage capacity testing. A reaction system of the device comprises a plurality of single-channel reactors, a plurality of analysis systems correspond to the single-channel reactors respectively, a carrier gas pipeline and a basic atmosphere gas pipeline of a gas distribution system comprise a gas source I, a pressure stabilizing valve, a pressure gauge, a switch valve and a one-way valve which are sequentially connected, and the outlet end of the one-way valve is divided into a plurality of branches I and provided with MFCs; the liquid supply source and the auxiliary carrier gas source are connected with the liquid evaporation tank and a pipeline is provided with an MFC; a CO gas pipeline and an O2 gas pipeline of the OSC gas switching unit comprise a gas source II, a pressure stabilizing valve, a pressure gauge, a switching valve and a one-way valve which are connected in sequence; the outlet end of the one-way valve is divided into a plurality of branches II provided with auxiliary carrier gas and is provided with an MFC and a high-speed switching valve; and the control system is electrically connected with each switch valve of the gas distribution system, each MFC, each high-speed switching valve, the reaction system and the analysis system.

The application discloses a kind of vehicle rear oxygen sensor response fault diagnosis method, device and vehicle.It includes: the oxygen storage capacity of catalytic converter under different exhaust flow is obtained;According to different exhaust flow and its corresponding oxygen storage capacity, the relationship between exhaust flow and oxygen storage capacity is determined;According to the relationship between exhaust flow and oxygen storage capacity, whether the response of rear oxygen sensor is fault is diagnosed.Under the premise that the original operating condition of vehicle is not changed, the slow response fault of rear oxygen sensor is diagnosed, the stability of entire automobile system is ensured, and the method is not only suitable for traditional car, but also suitable for hybrid electric vehicle.

The present invention discloses a control system and strategy for target compensation of the air-fuel ratio oxygen storage percentage of a natural gas engine, which is implemented by using the control system as described above. The control strategy includes: when the natural gas engine is running, measuring the air-fuel ratio at the inlet and outlet of the three-way catalytic converter through the front oxygen sensor and the rear oxygen sensor; feeding back the rich and lean conditions of the air-fuel ratio control of the engine body through the measured value of the rear oxygen sensor; using the average value of the continuously measured rear oxygen concentration for N times in real time to query the ROL target compensation curve calibrated in the ECU, so as to obtain a ROL target compensation value to correct and calculate the ROL target value; and then comparing the corrected and calculated ROL target value with the actual ROL value, calculating the correction amount of the front oxygen concentration, and finally obtaining the front oxygen concentration target value. Thereby, the closed-loop speed of the air-fuel ratio based on the control of the oxygen storage percentage (ROL) can be greatly improved, and finally the control accuracy of the air-fuel ratio at the inlet of the catalytic converter can be improved.

The present application provides a method, device, medium and equipment for diagnosing the conversion efficiency of a three-way catalytic converter, which determines the operating state of a target vehicle; if the operating state is a coasting state, calculates a coasting cumulative parameter; if the coasting cumulative parameter meets a preset condition, calculates the circulating oxygen storage amount from the first time when the target vehicle exits the coasting state to the second time when oxygen release is completed, so as to determine the conversion efficiency of the three-way catalytic converter of the target vehicle; that is, during the operation of the target vehicle, its operating state is determined according to its operating state parameters. If the target vehicle is in a coasting state, the coasting cumulative parameter is calculated, and after the preset condition is met, the circulating oxygen storage amount is calculated to determine the conversion efficiency of the three-way catalytic converter of the target vehicle, so that the oxygen storage amount of the target vehicle in an oxygen storage to oxygen release cycle can be accurately calculated, and then the conversion efficiency of the three-way catalytic converter can be accurately calculated, so as to more accurately evaluate the degree of degradation of the three-way catalytic converter of the target vehicle.

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 present application relates to the technical field of vehicle engine control, in particular to an EGR control method based on performance improvement, an electronic device and a vehicle. The EGR control method based on performance improvement is proposed, the basic duration of maintaining the target opening degree of the EGR valve unchanged after the EGR closed loop is exited is determined, and the remaining duration of maintaining the target opening degree of the EGR valve unchanged is optimized based on the catalyst oxygen storage capacity coefficient change and the air-fuel ratio change, so as to obtain the final EGR valve target opening degree maintenance time after the EGR closed loop is exited, so as to optimize the EGR valve target opening degree control after the EGR closed loop is exited, and then improve the stability of the engine emission and supercharging control in the EGR closed loop exit process.

A method to determine the oxygen storage capacity of a catalytic converter (15, 17) of an exhaust gas system (2) of an internal combustion engine (1) is described; wherein the exhaust gas system (2) is provided with an exhaust duct (10), along which catalytic converter (15, 17) is housed; a lambda sensor (19, 20) housed along exhaust duct (10) downstream of catalytic converter (15, 17) to detect the concentration of oxygen in the exhaust gases; and an exhaust gas aftertreatment system (14) having a burner (21) designed to introduce exhaust gases into exhaust duct (10); wherein inside burner (21) there is defined a combustion chamber (22), which receives fresh air through a first supply circuit (23) and fuel from a second supply circuit (29). The method comprises a step in which to recognise that internal combustion engine (1) is in a stop phase or in a slow running mode; a step in which to control the first and the second supply circuit (23, 29) so as to obtain a given objective lambda value (λOBJ), in particular other than one; a step in which to determine a delay (Dλ) with which lambda sensor (19, 20) detects the change in objective lambda value (λOBJ); and a step in which to calculate the oxygen storage capacity of catalytic converter (15, 17) by means of said delay (Dλ).