CN105597747A - Catalyst used for diesel vehicle particulate matter traps, and preparation method thereof - Google Patents
Catalyst used for diesel vehicle particulate matter traps, and preparation method thereof Download PDFInfo
- Publication number
- CN105597747A CN105597747A CN201510739008.4A CN201510739008A CN105597747A CN 105597747 A CN105597747 A CN 105597747A CN 201510739008 A CN201510739008 A CN 201510739008A CN 105597747 A CN105597747 A CN 105597747A
- Authority
- CN
- China
- Prior art keywords
- catalyst
- preparation
- particulate matter
- nitrate
- diesel vehicle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention relates to a catalyst used for diesel vehicle particulate matter traps, and a preparation method thereof. The catalyst comprises a carrier and an active coating; the active coating comprises a rare-earth composite oxide, modified aluminum oxide, a silica-alumina composite oxide, a binder, and an active ingredient; the main ingredients of the rare-earth composite oxide are oxides of cerium, zirconium, lanthanum, and praseodymium; molar ratio of cerium to zirconium ranges from 10:1 to 5:1; the mass of the lanthanum oxide accounts for 1 to 5% of that of the rare-earth composite oxide; and the mass of the praseodymium oxide accounts for 1 to 5% of that of the rare-earth composite oxide. The preparation method comprises following steps: (1) preparation of a first coating slurry; (2) preparation of a second coating slurry; (3) preparation of a catalyst slurry; and (4) coating of the carrier with the catalyst slurry. The catalyst is capable of adapting the particularity of diesel vehicle tail gas, and realizing combustion initiation of particulate matters at a temperature as low as possible; contact reaction of solid particulate matters with the catalyst is uniform; improvement on emission of other harmful gas is realized; and the particulate matter traps are protected effectively.
Description
Technical field
The present invention relates to a kind of diesel vehicle particulate matter trap Catalysts and its preparation method, belong to diesel car tail gas refining technical field.
Background technology
Along with developing rapidly of transportation and growing with each passing day of city automobile owning amount, automobile industry has become one of pillar industry of China. China's automobile pollution has reached more than 100,000,000 at present, and within one period in the future, keeps the situation of sustainable growth, and tai-gas clean-up catalyst, also certainly will be along with the development of automobile as an indispensable part on automobile.
The exhaust emission of automobile is subject to people's attention day by day to the pollution of atmosphere, and many countries make various regulations one after another, takes many measures, comprises that means administrative, technology etc. are to the in addition strict control of the pollution emission of automobile. Discharge standard is mainly formulated for the discharge of HC, CO and these three kinds of materials of NOx. At present, the car of producing in the country in the U.S. and Europe has all been installed arrangement for catalytic purification, and the car that three-way catalytic converter is installed in worldwide has exceeded 90%. On the Chinese side, along with the fast development of automobile industry and the progressively enhancing of environmental consciousness, the catalytic conversion technique of motor vehicle exhaust emission is more and more subject to the people's attention.
Compared with gasoline car, diesel car fuel oil economy is higher, and the greenhouse gases of discharge are relatively less. the diesel vehicle therefore with low oil consumption, low emission, high power characteristic more and more gets more and more people's extensive concerning. although diesel vehicle has higher fuel economy and relatively low tail gas pollution discharge compared with gasoline car, but the problem of environmental pollution that the discharges such as diesel vehicle imperfect combustion thing, nitrogen oxide, carbon soot particles bring still needs to attract great attention, in case follow the track of an overturned cart for the treatment of after pollution. the patent No. is that the patent of invention of CN103084176B discloses a kind of diesel car tail gas refining dual oxide type Catalysts and its preparation method, comprise the front grade carrier and the rear grade carrier that axially set gradually along engine exhaust port, described front grade carrier is near engine exhaust port setting, described rear grade carrier is away from engine exhaust port setting, on described front grade carrier, be coated with prime coating, on described rear grade carrier, be coated with rear class coating, effectively increase carrying capacity on active coating, overcome coating shedding, and coating is even, there is obvious catalytic activity, can effectively realize diesel car tail gas refining. but in actual use, the effect of catalysis is undesirable all the time, and particle content can not get effective control.
At present, particle collection technology is the most effectively particle purifying technology of generally acknowledging, is also one of best technology of current commercial prospect. Its capture method mainly contains Electrostatic Absorption method, Mist Using Filtering and Capturing Method and cyclonic separation method etc. In the middle of these several trapping techniques, Mist Using Filtering and Capturing Method is the diesel engine particulate thing post processing mode that current each research institution generally adopts, and its practical prerequisite is to select the material for trapping of economy and durability and be equipped with suitable renovation process. Catalytic regeneration is to utilize the method for chemical catalysis to reduce the reactivity of particle, can make particle burn under diesel engine normal running (operation) conditions, reaches the object of regeneration. But the catalytic effect of existing particulate matter trap is poor, holding back of particle is not remarkable, needs the further suitable Catalysts and its preparation method of research.
Adopt the thermic load that filtering bodies is subject in this way less, improved the life and reliability of filtering bodies. The research emphasis of catalytic regeneration technology is how to find more efficiently catalyst and carries out coating coating at present.
Summary of the invention
One of object of the present invention is to provide a kind of diesel vehicle particulate matter trap catalyst; be suitable for the particularity of exhaust gas from diesel vehicle; make particle can be at alap temperature ignition; the haptoreaction of solid particulate matter and catalyst is even; and can take into account the discharge of other pernicious gases simultaneously; tail gas is carried out to efficient catalytic regeneration, can effectively protect again particulate matter trap.
For achieving the above object, the present invention adopts following technical scheme: a kind of diesel vehicle particulate matter trap catalyst, comprise carrier and active coating, described carrier material is cordierite honeycomb ceramic, carborundum or aluminium titanates etc., and described active coating comprises complex rare-earth oxidate containing valuable metal, modified aluminas, sial composite oxides, binding agent and active component; The principal component of described complex rare-earth oxidate containing valuable metal is the oxide of cerium, zirconium, lanthanum, praseodymium; The mol ratio of cerium, zirconium is 10:1～5:1, and the quality of the oxide of lanthanum is described complex rare-earth oxidate containing valuable metal 1%～5%, and the quality of the oxide of praseodymium is described complex rare-earth oxidate containing valuable metal 1%～5%; Described active component is the mixture of a kind of in palladium, rhodium or two kinds, and the presoma of described palladium and rhodium is respectively palladium nitrate and rhodium nitrate.
Technique scheme is by selecting suitable ingredients; and the each component of reasonably optimizing; especially the proportioning of each element in rare earth oxide, not only can carry out efficient catalytic regeneration to particle, takes into account the discharge of other pernicious gases simultaneously; realize the thorough purification to tail gas; and catalyst slurry stability improves greatly, the high conformity of slurry, applies evenly; be not easy to come off, effective to the protection of particulate matter trap.
As preferably, in described active coating, be also added with additive, described additive is one or more in Ludox, aluminium glue, polymethacrylates, polyisobutene, ethylene propylene copolymer, hydroxyethylcellulose.
This technical scheme is by adding a kind of new material additive, control the stability of slurry, break traditional thinking of only sizing mixing with acid, solve traditional size mixing technology, Stability of Slurry is poor, and low concentration slurry acid consumption is large, and slurry is prone to precipitation, makes the poor defect of its levels slurry character uniformity. Add after new additive agent, compared with traditional size mixing technology, Stability of Slurry improves, and with low cost, and technique is simple, and low concentration slurry there will not be precipitation, and sizing agent consistency is good. Can realize the immersion coating repeatedly of carrier, can effectively increase carrying capacity on active coating, overcome coating shedding, and gradation coating composition high conformity, homogeneity of product is high. Because coating is more even, stable, this catalyst has obvious catalytic activity, can effectively realize tail-gas from gasoline automobiles and purify.
As preferably, the viscosity of described additive is 2000～6000mPas.
As preferably, described binding agent is one or both the mixture in boehmite, aluminum nitrate.
Two of object of the present invention is the preparation methods for above-mentioned catalyst is provided, and adopts following technical scheme:
A preparation method for catalyst for diesel vehicle particulate matter trap, comprises following step:
(1) deionized water is joined in complex rare-earth oxidate containing valuable metal, modified aluminas and binding agent, the granularity that is ground to slurry after stirring is 1～10 μ m; Active component presoma is added, stir; Obtain one-level coating paste; The speed that adds of described active component presoma is 10～100ml/min; The quality solubility of described active component precursor solution is 13%～18%, pH value < 1.0;
(2) deionized water is joined in complex rare-earth oxidate containing valuable metal, modified aluminas, sial composite oxides and binding agent, the granularity that is ground to slurry after stirring is 1～10 μ m; Active component presoma is added, stir, obtain secondary coating paste; The speed that adds of described active component presoma is 10～100ml/min; The quality solubility of described active component precursor solution is 13%～18%, pH value < 1.0;
(3) described one-level coating paste is mixed with secondary coating paste, stir 1～5h; Adjusting slurry solid content to 5%～20% that adds water, obtains catalyst pulp;
(4) carrier is immersed in the catalyst pulp of step (3) gained, by coating equipment from outlet side quick midge, then take off the carrier air gun that is filled slurry and blow away unnecessary slurry, after flash baking, roasting, obtain catalyst, the gain in weight after coating reaches 5～50g/L; The temperature of drying is 100～200 DEG C; The technique of roasting is elder generation roasting 0.5～1h, then roasting 2～3h under 500～600 DEG C of conditions under 300～400 DEG C of conditions.
This preparation method's flow process is simple, break through conventional thought, adopt noble metal to separate mode of loading, by the material adapted of different noble-metal-supporteds, the utilization rate that improves noble metal, makes it on every kind of material, bring into play maximum effectiveness, after absorption is stable, mixes and sizes mixing, suppress the migration of noble metal, greatly improved the stability of slurry; And realize high-efficient carrier and the interpolation of precious metal solution by controlling the acidity, concentration, precious metal solution titration speed etc. of precious metal solution, and guarantee the uniformity of coating, improve preparation efficiency.
As preferably, described additive is first prepared into additive solution, then adds in step (1) or step (2), and the preparation method of described additive solution is: deionized water is joined in additive to 30～80oUnder C, heat 10～60min, be stirred to completely and dissolve, obtain additive solution; The addition of described additive is 0.1～2% of described active coating total amount.
As preferably, described complex rare-earth oxidate containing valuable metal is by cerous nitrate, zirconyl nitrate, lanthanum nitrate, praseodymium nitrate are reacted to gained with precipitating reagent, concrete grammar is as follows: at ambient temperature, cerous nitrate, zirconyl nitrate, lanthanum nitrate, praseodymium nitrate, neodymium nitrate are mixed, under stirring condition, add precipitating reagent to the pH of solution be 9.0～10.0, reaction finishes rear ageing 3～6h, by the composite oxides presoma obtaining after filtration, after washing, dry for 100～120 DEG C and also after 500～600 DEG C of roastings, obtain complex rare-earth oxidate containing valuable metal.
As preferably, described precipitating reagent is one or more mixtures in ammoniacal liquor, ammonium carbonate, carbonic hydroammonium.
As preferably, described in step (6), carrier is before entering described catalyst pulp, first be immersed in one-level coating paste or secondary coating paste, by coating equipment from outlet side quick midge, then take off the carrier air gun that is filled slurry and blow away unnecessary slurry, after oven dry, roasting, obtain catalyst precarsor, make the gain in weight of catalyst precarsor reach 5～20g/L; Again catalyst precarsor is immersed in the catalyst pulp of step (5) gained, by coating equipment from outlet side quick midge, then take off the carrier air gun that is filled slurry and blow away unnecessary slurry, after flash baking, roasting, obtain catalyst.
By implementing technique scheme, the present invention:
(1) by suitable component, reasonably proportioning, not only can carry out efficient catalytic regeneration to particle, take into account the discharge of other pernicious gases simultaneously, realize the thorough purification to tail gas, and catalyst slurry stability improves greatly, the high conformity of slurry, apply evenly, be not easy to come off, effective to the protection of particulate matter trap;
(2) in catalyst pulp, add additive, control the stability of slurry, between raw material in additive and catalyst, amalgamation is good, compared with adopting sour technique of sizing mixing with tradition, catalyst pulp stability improves, and with low cost, technique is simple, and catalyst pulp there will not be precipitation, and sizing agent consistency is good, without layering and deposited phenomenon, higher with the adhesion strength of carrier, the uniformity of coating is better, has improved the clean-up effect of catalyst to tail-gas from gasoline automobiles, this catalyst has obvious catalytic activity, can effectively realize tail-gas from gasoline automobiles and purify;
(3) adopt noble metal to separate mode of loading, by the material adapted of different noble-metal-supporteds, improve the utilization rate of noble metal, make it on every kind of material, bring into play maximum effectiveness, after absorption is stable, mixes and size mixing, suppress the migration of noble metal, greatly improved the stability of slurry;
(4) realize high-efficient carrier and the interpolation of precious metal solution by controlling the acidity, concentration, precious metal solution titration speed etc. of precious metal solution, guarantee the uniformity of coating, improve preparation efficiency.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail.
Special instruction, below is only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention. Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Embodiment 1:
A kind of diesel vehicle particulate matter trap catalyst, comprises carrier and active coating, and said carrier material can be cordierite honeycomb ceramic, carborundum or aluminium titanates etc., and the present embodiment is selected cordierite honeycomb ceramic. Active coating comprises complex rare-earth oxidate containing valuable metal, modified aluminas, binding agent and active component. The principal component of complex rare-earth oxidate containing valuable metal is the oxide of cerium, zirconium, lanthanum, praseodymium; Employing coprecipitation is synthetic: at ambient temperature, cerous nitrate, zirconyl nitrate, lanthanum nitrate, praseodymium nitrate are mixed, under stirring condition, add precipitating reagent to the pH of solution be 9.0, reaction finishes rear ageing 4h, by the composite oxides presoma obtaining after filtration, after washing, dry for 110 DEG C and also after 550 DEG C of roastings, obtain complex rare-earth oxidate containing valuable metal. Each component is 1:5 by the mol ratio of cerium, zirconium, and the quality of the oxide of lanthanum is described complex rare-earth oxidate containing valuable metal 3%, and the quality of the oxide of praseodymium is described complex rare-earth oxidate containing valuable metal 3% adds. Wherein, precipitating reagent is the mixture of ammoniacal liquor and ammonium carbonate. Modified aluminas is the γ-Al of La modification2O3. Binding agent is boehmite. Active component is palladium and two kinds of two noble metal systems of mixing composition of rhodium, and the presoma of palladium and rhodium is respectively palladium nitrate and rhodium nitrate.
Concrete preparation process comprises:
(1) deionized water being joined in complex rare-earth oxidate containing valuable metal, modified aluminas, sial composite oxides and binding agent, is 1～10 μ m by the granularity that sand mill is ground to slurry after stirring; Active component presoma is added by 1.0g in every liter of carrier, stir; Obtain one-level coating paste; The mass ratio of deionized water and complex rare-earth oxidate containing valuable metal, modified aluminas is 1:0.1:0.05, and the consumption of binding agent is 6% of active coating total amount; The rate of addition of active component presoma is 10ml/min;
(2) deionized water being joined in complex rare-earth oxidate containing valuable metal, modified aluminas and binding agent, is 5～10 μ m by the granularity that sand mill is ground to slurry after stirring; Active component presoma is added by 2.0g in every liter of carrier, stir, obtain secondary coating paste; The mass ratio of deionized water and complex rare-earth oxidate containing valuable metal is 1:0.5, and the consumption of binding agent is 3% of active coating total amount;
(3) described one-level coating paste is mixed with secondary coating paste, stir 3h; The adjusting slurry solid content to 15% that adds water, obtains catalyst pulp;
(4) carrier is immersed in the catalyst pulp of step (3) gained, by coating equipment from outlet side quick midge, then take off the carrier air gun that is filled slurry and blow away unnecessary slurry,, flash baking under 100 DEG C of conditions, then immerse in catalyst pulp, blow away again unnecessary slurry, oven dry, repeat until the upper carrying capacity of catalyst pulp reaches 25g/L, then roasting 1h under 300 DEG C of conditions, then roasting 3h under 500 DEG C of conditions, obtains catalyst after roasting.
Embodiment 2:
A kind of diesel vehicle particulate matter trap catalyst, comprises carrier and active coating, and said carrier material can be cordierite honeycomb ceramic, carborundum or aluminium titanates etc., and the present embodiment is selected carborundum. Active coating comprises complex rare-earth oxidate containing valuable metal, modified aluminas, sial composite oxides, binding agent, additive and active component. The principal component of complex rare-earth oxidate containing valuable metal is the oxide of cerium, zirconium, lanthanum, praseodymium; Employing coprecipitation is synthetic: at ambient temperature, cerous nitrate, zirconyl nitrate, lanthanum nitrate, praseodymium nitrate are mixed, under stirring condition, add precipitating reagent to the pH of solution be 9.5, reaction finishes rear ageing 3h, by the composite oxides presoma obtaining after filtration, after washing, dry for 110 DEG C and also after 550 DEG C of roastings, obtain complex rare-earth oxidate containing valuable metal. Each component is 1:3 by the mol ratio of cerium, zirconium, and the quality of the oxide of lanthanum is described complex rare-earth oxidate containing valuable metal 5%, and the quality of the oxide of praseodymium is described complex rare-earth oxidate containing valuable metal 4% adds. Wherein, precipitating reagent is ammoniacal liquor. Binding agent is aluminum nitrate; Additive is polymethacrylates, and viscosity is 4000mPas. Active component is palladium, and palladium presoma is palladium nitrate.
Concrete preparation process comprises:
(1) deionized water is joined in additive to 30oUnder C, heat 60min, be stirred to completely and dissolve, obtain additive solution; The content of described additive is 1%;
(2) deionized water is joined in complex rare-earth oxidate containing valuable metal, sial composite oxides, modified aluminas and binding agent, after stirring, grind with sand mill; Active component presoma is added by 2.1g in every liter of active coating, stir; Obtain one-level coating paste; The granularity of described one-level coating paste is 1～6 μ m; The mass ratio of deionized water and complex rare-earth oxidate containing valuable metal, modified aluminas is 1:0.5:0.1, and the consumption of binding agent is 10% of active coating cumulative volume;
(3) deionized water is joined in complex rare-earth oxidate containing valuable metal, modified aluminas and binding agent, after stirring, grind with sand mill; Active component presoma is added by 1.5g in every liter of active coating, stir, obtain secondary coating paste; The granularity of described secondary coating paste is 5～10 μ m; The mass ratio of deionized water and complex rare-earth oxidate containing valuable metal is 1:0.1, and the consumption of binding agent is 5% of active coating total amount;
(4) additive solution preparing in a certain amount of step (1) is added in secondary coating paste, stir 5h, obtain catalyst pulp precursor; The volume proportion of described additive solution and described secondary coating paste meet additive solution be in active coating total amount 2%;
(5) described one-level coating paste is mixed with the described catalyst pulp precursor in step (4), stir 5h; The adjusting slurry solid content to 5% that adds water, obtains catalyst pulp;
(6) carrier is immersed in the catalyst pulp of step (5) gained, by coating equipment from outlet side quick midge, then take off the carrier air gun that is filled slurry and blow away unnecessary slurry, flash baking under 150 DEG C of conditions, repeat until the upper carrying capacity of catalyst pulp reaches 50g/L, then roasting 0.5h under 400 DEG C of conditions, then roasting 2h under 600 DEG C of conditions, obtains after roasting obtaining catalyst after catalyst roasting.
Embodiment 3:
A kind of diesel vehicle particulate matter trap catalyst, comprises carrier and active coating, and said carrier can be ceramic monolith, carborundum or aluminium titanates etc., and the present embodiment is selected aluminium titanates carrier. Active coating comprises complex rare-earth oxidate containing valuable metal, modified aluminas, sial composite oxides, binding agent, additive and active component. The principal component of complex rare-earth oxidate containing valuable metal is the oxide of cerium, zirconium, lanthanum, praseodymium; Employing coprecipitation is synthetic: at ambient temperature, cerous nitrate, zirconyl nitrate, lanthanum nitrate, praseodymium nitrate are mixed, under stirring condition, add precipitating reagent to the pH of solution be 10.0, reaction finishes rear ageing 6h, by the composite oxides presoma obtaining after filtration, after washing, dry for 110 DEG C and also after 550 DEG C of roastings, obtain complex rare-earth oxidate containing valuable metal. Each component is 1:1 by the mol ratio of cerium, zirconium, and the quality of the oxide of lanthanum is described complex rare-earth oxidate containing valuable metal 4%, and the quality of the oxide of praseodymium is described complex rare-earth oxidate containing valuable metal 5% adds. Wherein, precipitating reagent is carbonic hydroammonium. Binding agent is the mixture of boehmite and aluminum nitrate; Additive is polyisobutene, ethylene propylene copolymer, hydroxyethylcellulose three's mixture, and viscosity is 6000mPas. Active component is rhodium, and its presoma is rhodium nitrate.
Concrete preparation process comprises:
(1) deionized water is joined in additive to 60oUnder C, heat 40min, be stirred to completely and dissolve, obtain additive solution; The content of described additive is 2%;
(2) deionized water is joined in complex rare-earth oxidate containing valuable metal, sial composite oxides, modified aluminas and binding agent, after stirring, grind with sand mill; Active component presoma is added by 1.6g in every liter of carrier, stir; Obtain one-level coating paste; The granularity of described one-level coating paste is 5 μ m; The mass ratio of deionized water and complex rare-earth oxidate containing valuable metal, modified aluminas is 1:0.3:0.4, and the consumption of binding agent is 8% of active coating total amount;
(3) deionized water is joined in complex rare-earth oxidate containing valuable metal, modified aluminas and binding agent, after stirring, grind with sand mill; Active component presoma is added by 2.1g in every liter of carrier, stir, obtain secondary coating paste; The granularity of described secondary coating paste is 5 μ m; The mass ratio of deionized water and complex rare-earth oxidate containing valuable metal is 1:0.2, and the consumption of binding agent is 2% of active coating total amount;
(4) additive solution preparing in step (1) is added in secondary coating paste, stir 8h, obtain catalyst pulp precursor; It is 1% of active coating total amount that the proportioning of described additive solution and described secondary coating paste meets additive solution;
(5) described one-level coating paste is mixed with the described catalyst pulp precursor in step (4), stir 1h; The adjusting slurry solid content to 8% that adds water, obtains catalyst pulp;
(6) carrier is immersed in one-level coating paste or secondary coating paste, the present embodiment is selected one-level coating paste, by coating equipment from outlet side quick midge, then take off the carrier air gun that is filled slurry and blow away unnecessary slurry, take out 200 DEG C of oven dry, then immerse, after oven dry, roasting, until the gain in weight of carrier reaches 5～20g/L, the present embodiment is 10g/L, obtains catalyst precarsor; Again catalyst precarsor is immersed in the catalyst pulp of step (5) gained, by coating equipment from outlet side quick midge, then take off the carrier air gun that is filled slurry and blow away unnecessary slurry, flash baking under 200 DEG C of conditions, then immerse, dry, until the upper carrying capacity of catalyst pulp reaches 45g/L, then roasting 0.8h under 360 DEG C of conditions, then roasting 2.5h under 550 DEG C of conditions, obtains catalyst after roasting, obtains catalyst after roasting.
Embodiment 4:
Be from the different of embodiment 1: in active coating, added transition metal oxide, the stability of catalyst is had more significantly and improved, be used in conjunction with additive, add more separately additive effect and will get well, also resulting improvement of the adhesion property of catalyst pulp and carrier; Addition is 0.01～0.1% of rare earth oxide amount. That transition metal oxide is selected is NiO, Fe2O3、Co2O3In one or more mixtures, be preferably NiO and Fe2O3Mixing, NiO and Co2O3Mixing, the present embodiment adopts NiO and Co2O3Mixture, mass mixing ratio is 1:0.1～0.5, the present embodiment is preferably 1:0.5.
Embodiment 5:
Be from the different of embodiment 1: in active coating, added rare earth oxide auxiliary agent, addition is 0.01～0.1% of rare earth oxide and modified aluminas total amount. Rare earth oxide selection of auxiliary be La2O3，Nd2O3，CeO2In one or more, preferred plan is independent use, the present embodiment is selected La2O3。
Claims (10)
1. a diesel vehicle particulate matter trap catalyst, comprises carrier and active coating, it is characterized in that: described active coating comprises complex rare-earth oxidate containing valuable metal, modified aluminas, sial composite oxides, binding agent and active component; The principal component of described complex rare-earth oxidate containing valuable metal is the oxide of cerium, zirconium, lanthanum, praseodymium; The mol ratio of cerium, zirconium is 10:1～5:1, and the quality of the oxide of lanthanum is described complex rare-earth oxidate containing valuable metal 1%～5%, and the quality of the oxide of praseodymium is described complex rare-earth oxidate containing valuable metal 1%～5%; Described active component is the mixture of a kind of in palladium, rhodium or two kinds, and the presoma of described palladium and rhodium is respectively palladium nitrate and rhodium nitrate.
2. a kind of diesel vehicle particulate matter trap catalyst according to claim 1, it is characterized in that: in described active coating, be also added with additive, described additive is one or more in Ludox, aluminium glue, polymethacrylates, polyisobutene, ethylene propylene copolymer, hydroxyethylcellulose.
3. a kind of diesel vehicle particulate matter trap catalyst according to claim 3, is characterized in that: the viscosity of described additive is 2000～6000mPas.
4. a kind of diesel vehicle particulate matter trap catalyst according to claim 1, is characterized in that: described binding agent is one or both the mixture in boehmite, aluminum nitrate.
5. the preparation method of catalyst for a kind of diesel vehicle particulate matter trap as claimed in claim 2, is characterized in that: comprise following step:
(1) deionized water is joined in complex rare-earth oxidate containing valuable metal, sial composite oxides, modified aluminas and binding agent, the granularity that is ground to slurry after stirring is 1～10 μ m; Active component presoma is added, stir; Obtain one-level coating paste; The speed that adds of described active component presoma is 10～100ml/min;
(2) deionized water is joined in complex rare-earth oxidate containing valuable metal, modified aluminas and binding agent, the granularity that is ground to slurry after stirring is 1～10 μ m; Active component presoma is added, stir, obtain secondary coating paste; The speed that adds of described active component presoma is 10～100ml/min;
(3) described one-level coating paste is mixed with secondary coating paste, stir 1～5h; Adjusting slurry solid content to 5%～20% that adds water, obtains catalyst pulp;
(4) carrier is immersed in the catalyst pulp of step (3) gained, take out the carrier that soaks full catalyst pulp, blow away unnecessary slurry, after flash baking, roasting, obtain catalyst; The temperature of drying is 100～200 DEG C; The technique of roasting is elder generation roasting 0.5～1h, then roasting 2～3h under 500～600 DEG C of conditions under 300～400 DEG C of conditions.
6. the preparation method of catalyst for a kind of diesel vehicle particulate matter trap according to claim 5, is characterized in that: the gain in weight of the carrier of described catalyst after coating reaches 5～50g/L.
7. the preparation method of catalyst for a kind of diesel vehicle particulate matter trap according to claim 5, it is characterized in that: described additive is first prepared into additive solution, in step (1) or step (2), add again, the preparation method of described additive solution is: deionized water is joined in additive to 30～80oUnder C, heat 10～60min, be stirred to completely and dissolve, obtain additive solution; The addition of described additive is 0.1～2% of described active coating total amount.
8. the preparation method of catalyst for a kind of diesel vehicle particulate matter trap according to claim 5, it is characterized in that: described complex rare-earth oxidate containing valuable metal is by by cerous nitrate, zirconyl nitrate, lanthanum nitrate, praseodymium nitrate reacts gained with precipitating reagent, concrete grammar is as follows: at ambient temperature, by cerous nitrate, zirconyl nitrate, lanthanum nitrate, praseodymium nitrate, neodymium nitrate mixes, under stirring condition, add precipitating reagent to the pH of solution be 9.0～10.0, reaction finishes rear ageing 3～6h, by the composite oxides presoma obtaining after filtration, after washing, dry and obtain complex rare-earth oxidate containing valuable metal after 500～600 DEG C of roastings for 100～120 DEG C.
9. the preparation method of catalyst for a kind of diesel vehicle particulate matter trap according to claim 8, is characterized in that: described precipitating reagent is one or more mixtures in ammoniacal liquor, ammonium carbonate, carbonic hydroammonium.
10. the preparation method of catalyst for a kind of diesel vehicle particulate matter trap according to claim 5, it is characterized in that: described in step (6), carrier is before entering described catalyst pulp, first be immersed in one-level coating paste or secondary coating paste, take out after oven dry, roasting, obtain catalyst precarsor, make the gain in weight of catalyst precarsor reach 5～20g/L; Again catalyst precarsor is immersed in the catalyst pulp of step (5) gained, takes out the carrier that soaks full catalyst pulp, blow away unnecessary slurry, after flash baking, roasting, obtain catalyst.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510739008.4A CN105597747A (en) | 2015-11-04 | 2015-11-04 | Catalyst used for diesel vehicle particulate matter traps, and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510739008.4A CN105597747A (en) | 2015-11-04 | 2015-11-04 | Catalyst used for diesel vehicle particulate matter traps, and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105597747A true CN105597747A (en) | 2016-05-25 |
Family
ID=55978413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510739008.4A Pending CN105597747A (en) | 2015-11-04 | 2015-11-04 | Catalyst used for diesel vehicle particulate matter traps, and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105597747A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110743542A (en) * | 2019-10-22 | 2020-02-04 | 浙江达峰汽车技术有限公司 | Catalyst coating for gasoline engine particulate matter filter carrier and preparation method thereof |
| CN111085239A (en) * | 2019-12-17 | 2020-05-01 | 江苏苏净集团有限公司 | Preparation method of honeycomb carrier catalytic material based on molecular sieve |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1792430A (en) * | 2005-12-30 | 2006-06-28 | 中国科学院上海硅酸盐研究所 | Composite, mesohole, three-effect catalysis material contg. zirconium oxide and cerium oxide, and its prepn. method |
| CN101209425A (en) * | 2006-12-30 | 2008-07-02 | 比亚迪股份有限公司 | Method for preparing slurry containing aluminum oxide |
| CN102631917A (en) * | 2012-04-09 | 2012-08-15 | 福州大学 | Oxidation catalyst for purifying tail gas of diesel vehicle and preparation method for oxidation catalyst |
| CN103084176A (en) * | 2012-12-10 | 2013-05-08 | 浙江达峰汽车技术有限公司 | Double-oxidization catalyst for purifying diesel engine exhaust and preparation method thereof |
-
2015
- 2015-11-04 CN CN201510739008.4A patent/CN105597747A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1792430A (en) * | 2005-12-30 | 2006-06-28 | 中国科学院上海硅酸盐研究所 | Composite, mesohole, three-effect catalysis material contg. zirconium oxide and cerium oxide, and its prepn. method |
| CN101209425A (en) * | 2006-12-30 | 2008-07-02 | 比亚迪股份有限公司 | Method for preparing slurry containing aluminum oxide |
| CN102631917A (en) * | 2012-04-09 | 2012-08-15 | 福州大学 | Oxidation catalyst for purifying tail gas of diesel vehicle and preparation method for oxidation catalyst |
| CN103084176A (en) * | 2012-12-10 | 2013-05-08 | 浙江达峰汽车技术有限公司 | Double-oxidization catalyst for purifying diesel engine exhaust and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110743542A (en) * | 2019-10-22 | 2020-02-04 | 浙江达峰汽车技术有限公司 | Catalyst coating for gasoline engine particulate matter filter carrier and preparation method thereof |
| CN111085239A (en) * | 2019-12-17 | 2020-05-01 | 江苏苏净集团有限公司 | Preparation method of honeycomb carrier catalytic material based on molecular sieve |
| CN111085239B (en) * | 2019-12-17 | 2023-03-14 | 江苏苏净集团有限公司 | Preparation method of honeycomb carrier catalytic material based on molecular sieve |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107921416B (en) | Nitrous oxide removal catalyst for exhaust system | |
| CN103433057B (en) | Three-way catalyst used for automobile emission purification and preparation method thereof | |
| CN103084176B (en) | Double-oxidization catalyst for purifying diesel engine exhaust and preparation method thereof | |
| US10919025B2 (en) | N2O removal from automotive exhaust for lean/rich systems | |
| CN102008958B (en) | Three-way catalyst used for purifying gasoline car tail gas and preparation method thereof | |
| CN105170149A (en) | Preparation method for low precious metal catalyst for purifying motor vehicle exhaust | |
| US6585945B2 (en) | SOx tolerant NOx trap catalysts and methods of making and using the same | |
| CN102188971B (en) | Quadruple effect catalyst of diesel tail gas and preparation method and application of quadruple effect catalyst | |
| CN103071524B (en) | Oxidation catalyst for purifying diesel engine waste gas and preparation method of oxidation catalyst | |
| CN101879445A (en) | Composite rear earth pyrochlore-type oxide catalyst for catalyzing burning for removing soot of diesel vehicle and preparation method thereof | |
| CN103801288B (en) | For the composite oxide catalysts and preparation method thereof of oxidation of nitric oxide | |
| CN105251485A (en) | Motor vehicle exhaust purification catalyst and production process thereof | |
| CN109590017A (en) | Use for diesel engine catalyst and preparation method thereof based on compound primary catalysts and hydrotalcite Derived Oxides | |
| CN105233820A (en) | High-stability catalyst for purifying tail gas of gasoline car and preparation method thereof | |
| JP3788141B2 (en) | Exhaust gas purification system | |
| CN105597747A (en) | Catalyst used for diesel vehicle particulate matter traps, and preparation method thereof | |
| CN101700497B (en) | Ternary catalyst for metal honeycomb carrier of motorcycle and method for preparing same | |
| CN106362793A (en) | Oxidation catalyst for purifying exhaust gas of diesel engine and preparation method thereof | |
| JP2825420B2 (en) | Diesel engine exhaust gas purification catalyst | |
| CN105289597A (en) | Noble metal loading process technology for motor vehicle tail gas purification catalyst | |
| JPH11221466A (en) | Catalyst for purifying exhaust gas and purification of exhaust gas | |
| CN105056946A (en) | Quaternary catalyst for in-cylinder direct injection engine and preparation method therefor | |
| CN108554406A (en) | A kind of load alloy-type soot oxidation catalyst and preparation method thereof | |
| JPH05305240A (en) | Exhaust gas purifying catalyst | |
| JP4301348B2 (en) | Nitrogen oxide decomposition catalyst and diesel engine exhaust gas purification method using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160525 |
|
| RJ01 | Rejection of invention patent application after publication |