CN102416343B - NOx selective catalytic reduction molecular sieve catalyst and preparation method - Google Patents

NOx selective catalytic reduction molecular sieve catalyst and preparation method Download PDF

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CN102416343B
CN102416343B CN201110275543.0A CN201110275543A CN102416343B CN 102416343 B CN102416343 B CN 102416343B CN 201110275543 A CN201110275543 A CN 201110275543A CN 102416343 B CN102416343 B CN 102416343B
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aqueous solution
salt
roasting
concentration
suspension
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CN102416343A (en
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王建强
刘双喜
高继东
马杰
沈美庆
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中国汽车技术研究中心
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Abstract

The invention relates to a NOx selective catalytic reduction molecular sieve catalyst and a preparation method. The composition of the catalyst is as follows: 10%-30% of CeO2-M and 90%-70% of Fe/ZSM-5, wherein M is TiO2 or WO3, the mass ratio of CeO2 to M is (3:1)-(1:1), and the ratio of SiO2 to Al2O3 in the molecular sieve ZSM-5 is 15-150. The preparation method comprises the following steps: preparing NH4ZSM-5 by ion exchange based on soluble Ce salt and titanium salt or W salt as raw materials, base as a coprecipitator, polyethylene glycol as a thickening agent, a molecular sieve HZSM-5 as the raw material and a soluble ammonia salt as an ammonia source; preparing FeZSM-5 by ion exchange based on soluble Fe salt as a raw material; and based on one or more of aluminum oxide sol, silica sol or zirconium acetate as a binding agent, coating FeZSM-5 on a cordierite honeycomb ceramic carrier and then coating CeO2-M, and then drying and roasting. The conversion rate of wide active temperature window of the catalyst is larger than 80%, and the high-efficiency catalytic removal of nitric oxide can be realized at the temperature of 190-600 DEG C.

Description

A kind of NOx SCR molecular sieve catalyst and preparation method

Technical field

The present invention relates to a kind of preparation method of selective catalytic reduction catalysts, more particularly, related to a kind of for removing the preparation method of the SCR molecular sieve catalyst of nitrogen oxide.

Background technology

Along with the development of automobile industry, China's environmental pollution and energy shortage problem become increasingly serious.For problem of environmental pollution, China has put into effect the Abgasgesetz of increasingly stringent.Meanwhile, for energy security and greenhouse effects problem, energy-saving and emission-reduction have become the eternal theme that is related to national economy sustainable development.Compare with gasoline car, diesel vehicle is more energy-conservation, the corresponding minimizing of greenhouse gases of discharge, and from the seventies in last century, Europe and Japan have just realized the situation of the dieselization of cargo vehicle and motorbus substantially.Under the promotion of energy-saving and emission-reduction policy, China also starts to pay close attention to the diesel vehicle with better fuel consumption and emission characteristic.The recoverable amount of China's diesel vehicle is only 0.2% of overall market at present, and the occupation rate that expects the year two thousand twenty China diesel-powered car reaches 30%.How popularization day by day along with diesel vehicle, solve NO xremove and just become the subject matter facing at present.

SCR technology (Selective Catalytic Reduction, SCR) is considered to solve exhaust gas from diesel vehicle nitrogen oxides pollution one of effective method the most.From 20 century 70s, V 2o 5-WO 3-TiO 2catalyst is widely used in coal-burning power plant and diesel vehicle denitrating flue gas.But this catalyst exists low temperature active not enough, the poor deficiency that waits of high high-temp stability.In addition, there is the volatilization of high temperature vanadium in V/W/Ti catalyst system and catalyzing, easily brings the environmental problem of pollution of vanadium.Because row's temperature of LD-diesel is lower, require SCR catalyst to there is good low temperature active; Row's temperature of large diesel engine is higher, particularly, after preposition particulate matter trap, requires SCR catalyst to have higher heat endurance.Therefore having better heat endurance molecular sieve catalytic system becomes study hotspot gradually.Research shows, with respect to Cu based molecular sieve, Fe based molecular sieve has good high temperature active and hydrothermal stability preferably.But exist subject matter to comprise: low temperature active is poor, the poisoning and poisoning problem of HC of Sulfur-Vapor of Lower Temperature.

At present domestic about having higher low temperature active, the patent of the Fe based molecular sieve method for preparing catalyst of stronger sulfur poisoning-resistant and HC poisoning performance have not been reported.Therefore, the deficiency existing for current Fe based molecular sieve catalyst, exploitation has higher low temperature active, has high sulfur poisoning-resistant and HC poisoning performance Fe based molecular sieve method for preparing catalyst simultaneously and just seems particularly necessary.

Summary of the invention

A kind of exhaust gas from diesel vehicle purification of nitrogen oxides of the present invention is to overcome the existing weak point of existing catalyst by the preparation method's of selective catalytic reduction catalysts object, develop a kind of within the scope of wider applied temps, have high catalytic activity for removing new catalyst of exhaust gas from diesel vehicle nitrogen oxide and preparation method thereof.

The invention provides a kind of exhaust gas from diesel vehicle purification of nitrogen oxides selective catalytic reduction catalysts:

A NOx SCR molecular sieve catalyst, consists of: (10%~30%) CeO 2-M+ (90%~70%) Fe/ZSM-5, wherein M is TiO 2or WO 3, CeO 2mass ratio=3 of/M: 1~1: 1; The SiO of molecular sieve ZSM-5 2/ Al 2o 3=15~150.

The preparation method of NOx SCR molecular sieve catalyst of the present invention, step is as follows:

1) get solubility cerium salt, obtained aqueous solution, concentration is 0.5~1.5mol/L, is first aqueous solution; The soluble-salt obtained aqueous solution of titanium or tungsten, concentration is 0.5~1.5mol/L, is second aqueous solution;

2) under stirring, in first aqueous solution and second aqueous solution, be added into respectively alkali precipitation agent, making pH value is 8~10, and to add polyethylene glycol be thickener, fully stirs 10~30min;

3) by step 2) standing 30~120min under the first solution of obtaining respectively and the second aqueous solution gained suspension room temperature, after 60-80 ℃ of ageing 1~3h, evenly mixes two kinds of suspensions under stirring;

4) to step 3) gained mixing suspension is at 60-80 ℃ of secondary ageing 10~16h;

5) by step 4) suspension after ageing carries out vacuum filtration, obtains filtrate washing to neutral, and product is dried 10~15h at 100~140 ℃ successively, 280~320 ℃ of preroast 0.5~1h, 450~550 ℃ of roasting 1~3h, obtain CeO 2-M.

6) get solubility ammonium salt, obtained aqueous solution, concentration is 0.2~1.5mol/L;

7) to step 6) gained solution, adding ammoniacal liquor to regulate pH value is 3~4, adds HZSM-5,70-90 ℃ is stirred 3~10h;

8) by step 7) suspension carry out vacuum filtration, obtain filtrate washing to neutral, product is dried 12~18h at 100~140 ℃, obtains NH 4zSM-5;

9) get soluble ferric iron salt, obtained aqueous solution, concentration is 0.5~1.5mol/L;

10) to step 9) gained solution, adding ammoniacal liquor to regulate pH value is 3~4, adds NH 4zSM-5,70-90 ℃ is stirred 3~30h;

11) by step 10) suspension carry out vacuum filtration, obtain filtrate washing to neutral, product is dried 12~18h at 100~140 ℃ successively, 450~550 ℃ of roasting 1~3h, obtain FeZSM-5;

12) get FeZSM-5 prepared by step (11), be added to the water, stir, add binding agent;

13) blank cordierite honeycomb ceramic carrier is immersed in slurry prepared by step (12) to dry 1~3h at 100~150 ℃ successively after taking-up, 450~550 ℃ of roasting 2~4h.

14) get CeO prepared by step (5) 2-M, is added to the water, and stirs, and adds binding agent;

15) by step 13) in the slurry prepared in step (14) of the carrier impregnation prepared, after taking-up at 100~150 ℃ dry 1~3h, 450~550 ℃ of roasting 2~4h.

The molar concentration of described alkali precipitation agent is 3.5~4.5mol/L, and the addition of polyethylene glycol is 1~10% of alkaline precipitating agent weight;

Described solubility cerium salt is cerous nitrate, cerous sulfate or cerous chlorate;

Described solubility titanium salt is titanyl sulfate, titanium tetrachloride or butyl titanate;

Described soluble tungsten salt is ammonium tungstate;

Described alkaline precipitating agent is ammoniacal liquor or carbonic hydroammonium;

Described solubility ammonium salt is ammonium nitrate, ammonium sulfate or carbonic hydroammonium;

Described soluble ferric iron salt is ferric nitrate, ferric sulfate or iron chloride;

Described binding agent is one or more in alumina sol, Ludox or acetic acid zirconium.

The preparation method who removes the selective catalytic reduction catalysts of exhaust gas from diesel vehicle nitrogen oxide of the present invention, take solubility cerium salt and titanium salt (or tungsten salt) is raw material, alkali is coprecipitator, polyethylene glycol is thickener, according to the molar concentration rate ratio of 3: 1~1: 1 preparation of Ce and Ti or W ion, obtains CeO 2-M.Take molecular sieve HZSM-5 as raw material, and solubility ammonium salt is ammonium source, and ion-exchange makes NH 4zSM-5.Take soluble ferric iron salt as raw material, and ion-exchange makes FeZSM-5.One or more of take in alumina sol, Ludox or acetic acid zirconium are binding agent, first apply FeZSM-5 on cordierite honeycomb ceramic carrier, dry roasting; Be coated with and be covered with CeO again 2-M, dries roasting.

After cordierite honeycomb ceramic carrier floods and takes out, repeated impregnations and dry, until reach the required coated weight of carrier;

Exhaust gas from diesel vehicle purification of nitrogen oxides provided by the invention has the following advantages with selective catalytic reduction catalysts tool: wide active temperature windows (conversion ratio is greater than 80%), and in 190-600 ℃ of temperature range, can realize efficient catalytic and remove nitrogen oxide.Meanwhile, accessory substance N 2o is less.There is good anti-hydrocarbon and SO 2poisoning capability, at steam or SO 2exist under atmosphere, SCR activity keeping is more than 80%.Can be applicable to NO in exhaust gas from diesel vehicle ximprovement, preparation process is simple, easy to operate, with low cost, can meet and reach the standard of existing motor vehicle tail-gas purifying and the needs of actual production.

The specific embodiment

Below in conjunction with embodiment, technical characterictic of the present invention is described further:

Embodiment 1

Get 21.7g cerous nitrate, be dissolved in (0.5mol/L) in 100mL ionized water, under rapid stirring, use 4mol/L NH 3h 2o precipitates, and regulating pH is 8, adds polyethylene glycol 0.3g, fully stirs 10min, the standing 1h of room temperature, 60 ℃ of ageing 3h; Get titanyl sulfate 8g, be dissolved in (0.5mol/L) in 100mL deionized water, under vigorous stirring, use 4mol/LNH 3h 2o precipitates, and titration end-point is that pH is 9, adds polyethylene glycol 0.2g, fully stirs 30min, the standing 1h of room temperature, 80 ℃ of ageing 3h; By two kinds of suspensions (according to CeO 2/ TiO 2(mass ratio)=3/1) stir fully and mix, and carry out ageing for the second time at 60 ℃, digestion time is 12h.Use vacuum filtration, obtain sediment, and use deionized water that sediment is washed to filtrate and is neutral, afterwards 100 ℃ of gained filter cakes are dried to 10h, 280 ℃ of preroast 0.5h, 450 ℃ of roasting 3h obtain CeO 2-TiO 2powder sample;

Get 8g ammonium nitrate and be dissolved in (0.5mol/L) in 100mL deionized water, adding ammoniacal liquor to regulate pH value is 3, adds 20gHZSM-5 (SiO 2/ Al 2o 3=15), 70 ℃ are stirred 10h; The suspension obtaining is carried out to vacuum filtration, obtain filtrate washing to neutral, product is dried 12h at 100 ℃, obtains NH 4zSM-5; Get 20.2g ferric nitrate and be dissolved in (0.5mol/L) in 100mL deionized water, adding ammoniacal liquor to regulate pH value is 3, adds 10g NH 4zSM-5,90 ℃ are stirred 3h; The suspension obtaining is carried out to vacuum filtration, obtain filtrate washing to neutral, product is dried 12h at 100 ℃, and 550 ℃ of roasting 1h, obtain FeZSM-5 powder sample;

The FeZSM-5 powder sample that adds 20g to make in 1L deionized water, stirs, and adds the binding agent alumina sol of mixed solution quality 20%, and stirring at room 0.5h, obtains slurry one.

Blank cordierite honeycomb ceramic carrier is immersed in slurry one, takes out the raffinate in after-blow clear opening road, at 100 ℃ of dry 1.5h.Then at 450 ℃ of roasting 2h, obtain honeycomb catalyst 1.

The CeO that adds 8g to make in 500mL deionized water 2-TiO 2powder sample, stirs, and adds the binding agent alumina sol of mixed solution quality 20%, and stirring at room 0.5h, obtains slurry two.

Honeycomb catalyst 1 is immersed in slurry two, takes out the raffinate in after-blow clear opening road, at 100 ℃ of dry 1.5h.Then at 450 ℃ of roasting 2h, the catalyst of acquisition is labeled as 1#, wherein CeO 2-TiO 2account for 10%, FeZSM-5 and account for 90%.

Get respectively the 60.60g cerous sulfate preparation 100ml aqueous solution (1.5mol/L) or the 24.65g cerous chlorate preparation 100ml aqueous solution (1.0mol/L) as cerium precursor salt, titanium salt is constant, according to CeO 2/ TiO 2mix (mass ratio)=2/1, HZSM-5 (SiO 2/ Al 2o 3=90), preparation method is constant, makes catalyst 2# and 3#, wherein CeO 2-TiO 2account for 20%, FeZSM-5 and account for 80%.

Cerium precursor salt is constant, gets respectively the 18.97g titanium tetrachloride preparation 100ml aqueous solution (1.0mol/L) or the 51.045g butyl titanate preparation 100ml aqueous solution (1.5mol/L) as titanium precursor body salt, according to CeO 2/ TiO 2mix (mass ratio)=1/1, HZSM-5 (SiO 2/ Al 2o 3=150), preparation method is constant, makes catalyst 4# and 5#, wherein CeO 2-TiO 2account for 30%, FeZSM-5 and account for 70%.

Catalyst 1#, the 2#, 3#, 4# and the 5# that handle well (Φ (20~40) * (20~40mm)) honeycomb is positioned in tubular reactor, and experiment condition is: NO 500ppm, NH 3500ppm, O 25%, N 2for Balance Air, total gas flow rate is 1500ml/min, air speed 30,000h -1, reaction temperature interval is from 100 ℃ to 650 ℃.Online NO, the NH of detecting 3, NO 2, N 2o concentration.In 190~600 ℃ of temperature ranges, NOx conversion ratio is more than 80%, and particularly, in 210~570 ℃ of temperature ranges, NOx conversion ratio reaches more than 90%.In investigating temperature range, selectively reach 99%, N 2o concentration is less than 15ppm.

Embodiment 2

Get 32.55g cerous nitrate and be dissolved in (0.75mol/L) in 100mL deionized water, use 4mol/L carbonic hydroammonium to precipitate under rapid stirring, regulating pH is 10, adds polyethylene glycol 0.5g, fully stirs 30min, the standing 1h of room temperature, 80 ℃ of ageing 3h; Get ammonium tungstate 149.25g, be dissolved in (0.5mol/L) in 100mL deionized water, under vigorous stirring, use 4mol/LNH 3h 2o precipitates, and titration end-point is that pH is 9, adds polyethylene glycol 0.2g, fully stirs 30min, the standing 1h of room temperature, 60 ℃ of ageing 3h; By two kinds of suspensions according to CeO 2/ WO 3(mass ratio)=3/1 is stirred fully and is mixed, and carries out ageing for the second time at 80 ℃, and digestion time is 12h.Use vacuum filtration, obtain sediment, and use deionized water that sediment is washed to filtrate and is neutral, afterwards 140 ℃ of gained filter cakes are dried to 15h, 320 ℃ of preroast 1h, 550 ℃ of roasting 1h obtain CeO 2-WO 3powder sample;

Get 2.64g ammonium sulfate and be dissolved in (0.2mol/L) in 100mL deionized water, adding ammoniacal liquor to regulate pH value is 4, adds 20gHZSM-5 (SiO 2/ Al 2o 3=15), 90 ℃ are stirred 3h; The suspension obtaining is carried out to vacuum filtration, obtain filtrate washing to neutral, product is dried 12h at 100 ℃, obtains NH 4zSM-5; Get 40g ferric sulfate solution (1mol/L) in 100mL deionized water, adding ammoniacal liquor to regulate pH value is 4, adds 10g NH 4zSM-5,70 ℃ are stirred 10h; The suspension obtaining is carried out to vacuum filtration, obtain filtrate washing to neutral, product is dried 18h at 140 ℃, and 450 ℃ of roasting 3h, obtain FeZSM-5 powder sample;

The FeZSM-5 powder sample that adds 20g to make in 1L deionized water, stirs, and adds the binding agent alumina sol of mixed solution quality 20%, and stirring at room 0.5h, obtains slurry one.

Blank cordierite honeycomb ceramic carrier is immersed in slurry one, takes out the raffinate in after-blow clear opening road, at 100 ℃ of dry 1.5h.Then at 450 ℃ of roasting 2h, obtain honeycomb catalyst 1.

The CeO that adds 8g to make in 500mL deionized water 2-WO 3powder sample, stirs, and adds the adhesive silicon sol of mixed solution quality 20%, and stirring at room 0.5h obtains slurry two.

Honeycomb catalyst 1 is immersed in slurry two, takes out the raffinate in after-blow clear opening road, at 100 ℃ of dry 1.5h.Then at 450 ℃ of roasting 2h, the catalyst of acquisition is labeled as 6#, wherein CeO 2-WO 3account for 10%, FeZSM-5 and account for 90%.

Get ammonium tungstate 298.50g preparation 100ml solution (1.0mol/L), according to CeO 2/ WO 3mix (mass ratio)=2/1, gets 11.86g carbonic hydroammonium as solubility ammonium salt (1.5mol/L), HZSM-5 (SiO 2/ Al 2o 3=90), other raw materials and preparation method are constant, and the catalyst of acquisition is labeled as 7#, wherein CeO 2-WO 3account for 20%, FeZSM-5 and account for 80%.

Get ammonium tungstate 447.75g preparation 100ml solution (1.5mol/L), according to CeO 2/ WO 3mix (mass ratio)=1/1, gets 40.55g iron chloride as soluble ferric iron salt (1.5mol/L), HZSM-5 (SiO 2/ Al 2o 3=150), other raw materials and preparation method are constant, and the catalyst of acquisition is labeled as 8#, wherein CeO 2-WO 3account for 30%, FeZSM-5 and account for 70%.

Using three kinds of materials of acetic acid zirconium or alumina sol, Ludox and acetic acid zirconium (mass ratio 1: 1: 1) respectively as binding agent, and the catalyst of acquisition is labeled as 8# and 9#.

By the catalyst 6# handling well, 7#, 8# and 9# (Φ (20~40) * (20~40mm)) honeycomb is positioned in tubular reactor, and experiment condition is: NO 500ppm, NH 3500ppm, O 25%, N 2for Balance Air, total gas flow rate is 1500ml/min, air speed 30,000h -1, reaction temperature interval is from 100 ℃ to 650 ℃.Online NO, the NH of detecting 3, NO 2, N 2o concentration.In 190~600 ℃ of temperature ranges, NOx conversion ratio is more than 80%, and particularly, in 210~570 ℃ of temperature ranges, NOx conversion ratio reaches more than 90%.In investigating temperature range, selectively reach 99%, N 2o concentration is less than 15ppm.

Embodiment 3

Catalyst 2#, 5# and 8# are at 10%H respectively 2o, 800 ℃, air speed 30000h -1, hydrothermal aging 48h.The catalyst of respectively hydrothermal aging being handled well (Φ (20~40) * (20~40mm)) honeycomb is positioned in tubular reactor, and experiment condition is with embodiment 1.In 250~480 ℃ of temperature ranges, NOx conversion ratio is more than 80%.In investigating temperature range, selectively reach 99%, N 2o concentration is less than 20ppm.

Embodiment 4

Catalyst 1#, 3# and 6# are at 40ppmSO respectively 2+ 14%O 2+ 5%CO 2+ 4.5%H 2o, 300 ℃, air speed 50000h -1, hydrothermal aging 48h.Respectively good catalyst (Φ (20~40) * (20~40mm)) honeycomb of sulphur burin-in process is positioned in tubular reactor, experiment condition is with embodiment 1.In 200~500 ℃ of temperature ranges, NOx conversion ratio is more than 80%.In investigating temperature range, selectively reach 99%, N 2o concentration is less than 20ppm.

Embodiment 5

Catalyst 4#, 7# and 6# are at 350ppm NO+350ppm NH respectively 3+ 14%O 2+ 50ppmC 6h 6+ 30ppmC 3h 6+ 2%H 2o, N 2for Balance Air, total gas flow rate is 1500ml/min, air speed 50,000h -1, reaction temperature interval is from 100 ℃ to 650 ℃.Online NO, the NH of detecting 3, NO 2, N 2o concentration.In 220~550 ℃ of temperature ranges, NOx conversion ratio is more than 80%, and particularly, in 260~500 ℃ of temperature ranges, NOx conversion ratio reaches more than 90%.In investigating temperature range, selectively reach 99%, N 2o concentration is less than 15ppm.

Claims (10)

1. a NOx SCR molecular sieve catalyst, is characterized in that active component consists of: 10%~30%CeO 2-M+90%~70%FeZSM-5, wherein M is TiO 2or WO 3, CeO 2mass ratio=3:1~1:1 of/M; The SiO of molecular sieve ZSM-5 2/ Al 2o 3=15~150; Preparation method is as follows:
1) get solubility cerium salt, obtained aqueous solution, concentration is 0.5~1.5mol/L, is first aqueous solution; The soluble-salt obtained aqueous solution of titanium or tungsten, concentration is 0.5~1.5mol/L, is second aqueous solution;
2) under stirring, in first aqueous solution and second aqueous solution, be added into respectively alkali precipitation agent, making pH value is 8~10, and to add polyethylene glycol be thickener, fully stirs 10~30min;
3) by step 2) standing 30~120min under the first solution of obtaining respectively and the second aqueous solution gained suspension room temperature, after 60-80 ℃ of ageing 1~3h, evenly mixes two kinds of suspensions under stirring;
4) to step 3) gained mixing suspension at 60-80 ℃ of secondary ageing 10~16h;
5) suspension after step 4) ageing is carried out to vacuum filtration, obtain filtrate washing to neutral, product is dried 10~15h at 100~140 ℃ successively, 280~320 ℃ of preroast 0.5~1h, and 450~550 ℃ of roasting 1~3h, obtain CeO 2-M;
6) get solubility ammonium salt, obtained aqueous solution, concentration is 0.2~1.5mol/L;
7) to step 6) gained solution, adding ammoniacal liquor to regulate pH value is 3~4, adds HZSM-5, and 70-90 ℃ is stirred 3~10h;
8) suspension of step 7) is carried out to vacuum filtration, obtain filtrate washing to neutral, product is dried 12~18h at 100~140 ℃, obtains NH 4zSM-5;
9) get soluble ferric iron salt, obtained aqueous solution, concentration is 0.5~1.5mol/L;
10), to step 9) gained solution, adding ammoniacal liquor to regulate pH value is 3~4, adds NH 4zSM-5,70-90 ℃ is stirred 3~30h;
11) suspension of step 10) is carried out to vacuum filtration, obtain filtrate washing to neutral, product is dried 12~18h at 100~140 ℃, and 450~550 ℃ of roasting 1~3h, obtain FeZSM-5;
12) get FeZSM-5 prepared by step 11), be added to the water, stir, add binding agent;
13) blank cordierite honeycomb ceramic carrier is immersed in slurry prepared by step 12), after taking-up at 100~150 ℃ dry 1~3h, 450~550 ℃ of roasting 2~4h;
14) get CeO prepared by step 5) 2-M, is added to the water, and stirs, and adds binding agent;
15), in the slurry that the carrier impregnation of being prepared by step 13) is prepared in step 14), after taking-up, at 100~150 ℃, be dried 1~3h, 450~550 ℃ of roasting 2~4h.
2. the NOx SCR molecular sieve catalyst preparation method of claim 1, is characterized in that step is as follows:
1) get solubility cerium salt, obtained aqueous solution, concentration is 0.5~1.5mol/L, is first aqueous solution; The soluble-salt obtained aqueous solution of titanium or tungsten, concentration is 0.5~1.5mol/L, is second aqueous solution;
2) under stirring, in first aqueous solution and second aqueous solution, be added into respectively alkali precipitation agent, making pH value is 8~10, and to add polyethylene glycol be thickener, fully stirs 10~30min;
3) by step 2) standing 30~120min under the first solution of obtaining respectively and the second aqueous solution gained suspension room temperature, after 60-80 ℃ of ageing 1~3h, evenly mixes two kinds of suspensions under stirring;
4) to step 3) gained mixing suspension at 60-80 ℃ of secondary ageing 10~16h;
5) suspension after step 4) ageing is carried out to vacuum filtration, obtain filtrate washing to neutral, product is dried 10~15h at 100~140 ℃ successively, 280~320 ℃ of preroast 0.5~1h, and 450~550 ℃ of roasting 1~3h, obtain CeO 2-M;
6) get solubility ammonium salt, obtained aqueous solution, concentration is 0.2~1.5mol/L;
7) to step 6) gained solution, adding ammoniacal liquor to regulate pH value is 3~4, adds HZSM-5, and 70-90 ℃ is stirred 3~10h;
8) suspension of step 7) is carried out to vacuum filtration, obtain filtrate washing to neutral, product is dried 12~18h at 100~140 ℃, obtains NH 4zSM-5;
9) get soluble ferric iron salt, obtained aqueous solution, concentration is 0.5~1.5mol/L;
10), to step 9) gained solution, adding ammoniacal liquor to regulate pH value is 3~4, adds NH 4zSM-5,70-90 ℃ is stirred 3~30h;
11) suspension of step 10) is carried out to vacuum filtration, obtain filtrate washing to neutral, product is dried 12~18h at 100~140 ℃, and 450~550 ℃ of roasting 1~3h, obtain FeZSM-5;
12) get FeZSM-5 prepared by step 11), be added to the water, stir, add binding agent;
13) blank cordierite honeycomb ceramic carrier is immersed in slurry prepared by step 12), after taking-up at 100~150 ℃ dry 1~3h, 450~550 ℃ of roasting 2~4h;
14) get CeO prepared by step 5) 2-M, is added to the water, and stirs, and adds binding agent;
15), in the slurry that the carrier impregnation of being prepared by step 13) is prepared in step 14), after taking-up, at 100~150 ℃, be dried 1~3h, 450~550 ℃ of roasting 2~4h.
3. method as claimed in claim 2, is characterized in that the molar concentration of described alkali precipitation agent is 3.5~4.5mol/L, and the addition of polyethylene glycol is 1~10% of alkali precipitation agent weight.
4. method as claimed in claim 2, is characterized in that described solubility cerium salt is cerous nitrate, cerous sulfate or cerous chlorate.
5. method claimed in claim 2, is characterized in that described solubility titanium salt is titanyl sulfate, titanium tetrachloride or butyl titanate.
6. method claimed in claim 2, is characterized in that described soluble tungsten salt is ammonium tungstate.
7. method claimed in claim 2, is characterized in that described alkali precipitation agent is ammoniacal liquor or carbonic hydroammonium.
8. method claimed in claim 2, is characterized in that described solubility ammonium salt is ammonium nitrate, ammonium sulfate or carbonic hydroammonium.
9. method claimed in claim 2, is characterized in that described soluble ferric iron salt is ferric nitrate, ferric sulfate or iron chloride.
10. method claimed in claim 2, is characterized in that described binding agent is one or more in alumina sol, Ludox or acetic acid zirconium.
CN201110275543.0A 2011-09-16 2011-09-16 NOx selective catalytic reduction molecular sieve catalyst and preparation method CN102416343B (en)

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