CN102698736A - High-thermal-stability catalyst for removing nitric oxide and preparation method thereof - Google Patents
High-thermal-stability catalyst for removing nitric oxide and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a high-thermal-stability catalyst for removing nitric oxide and a preparation method thereof. The catalyst uses cordierite honeycomb ceramics as carriers, a catalytic activity center is composed of oxides of vanadium, rear earth, tungsten and titanium, the catalyst comprises the components by weight percentage: 0.2%-2% of V2O5, 5%-20% of rear earth oxides, 5%-10% of ZrO2, 68%-89.8% of WO3 and 68%-89.8% of TiO2. The catalyst for catalyzing desorption of high-thermal-stability nitric oxide can efficiently catalyze to remove nitric oxide within the temperature range of 220-510 DEG C (the conversion rate is larger than 80%), simultaneously has good water thermal ageing resistance and SO2 ageing resistance capability, is suitable for management of diesel vehicle tail gases NOx, and is simple in preparation process, convenient to operate, low in cost, and capable of achieving the standard for tail gas purification of the existing vehicles and meeting the requirements for actual production.
Description
Technical field
The present invention relates to a kind of removal of nitrogen oxide Catalysts and its preparation method, more particularly, related to a kind of high thermal stability Catalysts and its preparation method that is used to remove nitrogen oxide.
Background technology
In recent years, China NO
xDischarging constantly increases, and ecological environment and human body health have been caused huge threat and murder by poisoning.NO
xPollution is mainly derived from moving sources such as the discharging of stationary source such as coal-fired plant flue gas and motor-vehicle tail-gas and discharges.Wherein, thermal power generation is a largest source, account for about 37%, and secondly be vehicular emission, the 3rd is the discharging of Industrial Boiler stove.According to statistics, national discharged nitrous oxides total amount reached 2273.6 ten thousand tons in 2010, brought grave danger for China's atmospheric environment.Along with the quick growth of the national economic development, quickening of urbanization process and automobile pollution, how therefore the nitrogen oxides pollution problem that following China faces control NO cost-effectively with increasingly serious
xDischarging, become the key issue that needs to be resolved hurrily in China air environmental pollution control field.
Ammonia SCR technology (NH
3Selective Catalytic Reduction, NH
3-SCR) be considered to NO
xCatalytic purification is one of effective method the most.NH
3The core of-SCR technology is the catalyst that exploitation has high activity, heat endurance and has excellent durability.At present, the NH of industrial applications
3-SCR catalyst is with TiO
2As carrier, V
2O
5As active component, add WO
3, MoO
3Deng as auxiliary agent, in the coal-fired plant flue gas denitration, be widely used, and the application of on the heavy-duty diesel vehicle that satisfies Europe IV (2005) and Europe V (2008), having succeeded, but in the use that is under an embargo of the U.S. and Japan.Poor mainly due to this catalyst high high-temp stability, there is the volatilization of high temperature vanadium, bring vanadium secondary pollution problem easily.Therefore, to V
2O
5-WO
3-TiO
2The deficiency of catalyst system and catalyzing, the exploitation high thermal stability has high catalytic activity catalyst simultaneously and just seems particularly necessary.
Summary of the invention
The purpose of a kind of removal of nitrogen oxide method for preparing catalyst of the present invention is to overcome the weak point that existing catalyst exists; Develop and a kind ofly in the applied temps scope of broad, have high catalytic activity and have high thermal stability, be used to new catalyst that removes nitrogen oxide and preparation method thereof.
Technical scheme of the present invention is following:
A kind of high heat stability catalyst that is used to remove nitrogen oxide is a carrier with the cordierite honeycomb ceramic, forms catalytic active center by vanadium, rare earth, tungsten and titanyl compound, and the mass percent of composition is: V
2O
5Be 0.2%-2%, rare earth oxide is 5%-20%, ZrO
2Be 5%-10%, WO
3And TiO
2Be 68%～89.8%.
Preparation of catalysts method of the present invention, carry out according to following step:
Active component V
2O
5Form with ammonium metavanadate adds, and content is the 0.2%-2% of catalyst quality percentage composition; Rare earth oxide comprises CeO
2, Er
2O
3And Tb
2O
3In at least a, add with the form of soluble-salt, content is the 5%-20% of catalyst quality percentage composition; ZrO
2Form with the solubility zirconates adds, and content is the 5%-10% of catalyst quality percentage composition; WO
3And TiO
2Form with the tungsten titanium valve adds;
(1) configuration quality percentage is 6～9% oxalic acid aqueous solution;
(2) in the oxalic acid aqueous solution of step (1) preparation, add ammonium metavanadate, soluble ree, solubility zirconates, tungsten titanium valve successively, heated and stirred is even;
(3) in the mixed solution of step (2) preparation, add binding agent, stirring obtains slurry, and the addition of said binding agent is 10～25% of a mixed liquor volume;
(4) cordierite honeycomb ceramic carrier is immersed in the slurry of step (3) preparation, takes out the back earlier at 120～150 ℃ of down dry 1.5～3h, then at 450～550 ℃ of roasting 3～5h.
Said solubility cerium salt is cerous nitrate, ammonium sulfate cerium or cerous chlorate.Said solubility terbium salt is terbium nitrate or acetic acid terbium.Said solubility erbium salt is erbium nitrate or acetic acid erbium.Said solubility zirconates is zirconyl nitrate, zirconium oxychloride or acetic acid zirconium.Said binding agent is at least a in aluminium colloidal sol, the Ludox.
In the said step (4), after cordierite honeycomb ceramic carrier flooded taking-up, repeated impregnations and drying were up to reaching the required coated weight of carrier.
Removal of nitrogen oxide catalyst provided by the invention has following advantage: can realize that in 220-510 ℃ of temperature range efficient catalytic removes nitrogen oxide (conversion ratio is greater than 80%), simultaneously, have anti-preferably hydrothermal aging and SO
2Aging ability can be applicable to exhaust gas from diesel vehicle NO
xImprovement, the preparation process is simple, and is easy to operate, with low cost, can satisfy and reach the standard and the demand of practical production of existing motor vehicle tail-gas purifying.
Description of drawings
Fig. 1 is (0.2%) V
2O
5-(5%) CeO
2-(5%) ZrO
2-(9%) WO
3-(81%) TiO
2The NOx of catalyst 1 removes performance curve.
The specific embodiment
Further technical scheme of the present invention is described below in conjunction with specific embodiment.
The embodiment of the invention uses tungsten titanium valve (DT-52, the beautiful inorganic chemical industry company that joins) to comprise tungstic acid and titanium dioxide, contains mass percent and be 10% WO
3, all the other are TiO
2
Embodiment 1
It is soluble in water to take by weighing 6g oxalic acid, is heated to dissolving fully at 80 ℃, is mixed with 6% oxalic acid aqueous solution.In oxalic acid solution, add the 0.257g ammonium metavanadate, down to dissolving fully, stir 0.5h at 80 ℃ of constant temperature.In above-mentioned solution, add the 12.614g cerous nitrate again, at 80 ℃ of constant temperature down to dissolving fully.In above-mentioned solution, add zirconyl nitrate 10.845g again, down to dissolving fully, stir 0.5h at 80 ℃ of constant temperature.In system, add 200ml water, add tungsten titanium valve 90g again, stir 0.5h at 80 ℃ of constant temperature.Again to the aluminium colloidal sol that wherein adds mixed liquor volume 10% as binding agent, stir 2h under the room temperature, obtain slurry.The blank cordierite honeycomb ceramic carrier is immersed in the slurry, takes out the raffinate in the after-blow clear opening road,,, obtain catalyst (0.2%) V then at 450 ℃ of roasting 5h at 120 ℃ of dry 1.5h
2O
5-(5%) CeO
2-(5%) ZrO
2-(9%) WO
3-(81%) TiO
2, be labeled as catalyst 1.
The ammonium metavanadate addition is constant, and the zirconyl nitrate addition is constant, and the addition that changes cerous nitrate is: 25.228g, and 50.455g, tungsten titanium valve addition is respectively: 85g and 75g make slurry; With the cordierite honeycomb ceramic carrier dipping,,, obtain catalyst (0.2%) V respectively more then at 500 ℃ of roasting 3h at 150 ℃ of dry 3h
2O
5-(10%) CeO
2-(5%) ZrO
2-(8.5%) WO
3-(76.5%) TiO
2(0.2%) V
2O
5-(20%) CeO
2-(5%) ZrO
2-(7.5%) WO
3-(67.5%) TiO
2, be labeled as catalyst 2, catalyst 3 respectively.
The ammonium metavanadate addition is constant, and the addition of cerous nitrate is constant, changes the zirconyl nitrate addition to be: 17.352g, and 21.69g, tungsten titanium valve addition is respectively: 87g and 85g make slurry; With the cordierite honeycomb ceramic carrier dipping,,, obtain catalyst (0.2%) V respectively more then at 550 ℃ of roasting 4h at 130 ℃ of dry 2h
2O
5-(5%) CeO
2-(8%) ZrO
2-(8.7%) WO
3-(78.3%) TiO
2(0.2%) V
2O
5-(5%) CeO
2-(10%) ZrO
2-(8.5%) WO
3-(76.5%) TiO
2, be labeled as catalyst 4, catalyst 5 respectively.
The ammonium metavanadate addition is constant, and the zirconyl nitrate addition is constant, and the addition that changes the ammonium sulfate cerium is: 19.421g, and tungsten titanium valve addition is respectively 90g, makes slurry; With the cordierite honeycomb ceramic carrier dipping,,, obtain catalyst (0.2%) V more then at 450 ℃ of roasting 3h at 120 ℃ of dry 1.5h
2O
5-(5%) CeO
2-(5%) ZrO
2-(9%) WO
3-(81%) TiO
2, be labeled as catalyst 6.
The ammonium metavanadate addition is constant, and the zirconyl nitrate addition is constant, and the addition that changes cerous chlorate is: 10.823g, and tungsten titanium valve addition is respectively 90g, makes slurry; With the cordierite honeycomb ceramic carrier dipping,,, obtain catalyst (0.2%) V more then at 450 ℃ of roasting 3h at 150 ℃ of dry 1.5h
2O
5-(5%) CeO
2-(5%) ZrO
2-(9%) WO
3-(81%) TiO
2, be labeled as catalyst 7.
The ammonium metavanadate addition is constant, and the addition of cerous nitrate is constant, and the addition that changes zirconium oxychloride is: 13.076g, and tungsten titanium valve addition is respectively: 90g makes slurry; With the cordierite honeycomb ceramic carrier dipping,,, obtain catalyst (0.2%) V more then at 450 ℃ of roasting 3h at 140 ℃ of dry 1.5h
2O
5Z-(5%) CeO
2-(5%) ZrO
2-(9%) WO
3-(81%) TiO
2, be labeled as catalyst 8.
The ammonium metavanadate addition is constant, and the addition of cerous nitrate is constant, and the addition that changes the acetic acid zirconium is: 13.285g, and tungsten titanium valve addition is respectively: 90g makes slurry; With the cordierite honeycomb ceramic carrier dipping,,, obtain catalyst (0.2%) V more then at 450 ℃ of roasting 3h at 120 ℃ of dry 1.5h
2O
5-(5%) CeO
2-(5%) ZrO
2-(9%) WO
3-(81%) TiO
2, be labeled as catalyst 9.
(Φ (20～40) * (20～40mm)) honeycomb is positioned over respectively in the tubular reactor, and experiment condition is: NO 500ppm, NH with the catalyst of handling well 1,2,3,4,5,6,7,8 and 9
3500ppm, O
25%, N
2Be balance gas, total gas flow rate is 1500ml/min, air speed 30,000h
-1, the reaction temperature interval is from 150 ℃ to 550 ℃.Online detection NO, NH
3, NO
2, N
2O concentration.In 220～510 ℃ of temperature ranges, the NOx conversion ratio is (to see table one) more than 80%, particularly 250～450.In ℃ temperature range, as shown in Figure 1, for the NOx of catalyst 1 removes performance curve, the NOx conversion ratio reaches more than 90%.In investigating temperature range, N
2O concentration is less than 50ppm.
Embodiment 2
It is soluble in water to take by weighing 8g oxalic acid, is heated to dissolving fully at 60 ℃, is mixed with 8% oxalic acid aqueous solution.In oxalic acid solution, add the 0.771g ammonium metavanadate, down to dissolving fully, stir 0.5h at 60 ℃ of constant temperature.In above-mentioned solution, add terbium nitrate 24.766g again, at 80 ℃ of constant temperature down to dissolving fully.In above-mentioned solution, add zirconyl nitrate 10.845g again, down to dissolving fully, stir 0.5h at 80 ℃ of constant temperature.In system, add 200ml water, add tungsten titanium valve 85g again, stir 0.5h at 80 ℃ of constant temperature.Again to the Ludox that wherein adds mixed liquor volume 25% as binding agent, stir 2h under the room temperature, obtain slurry.The blank cordierite honeycomb ceramic carrier is immersed in the slurry, takes out the raffinate in the after-blow clear opening road,,, obtain catalyst (0.6%) V then at 450 ℃ of roasting 5h at 120 ℃ of dry 1.5h
2O
5-(10%) Tb
2O
3-(5%) ZrO
2-(8.5%) WO
3-(76.5%) TiO
2, be labeled as catalyst 10.
The ammonium metavanadate addition is constant, and the zirconyl nitrate addition is constant, and the addition that changes the acetic acid terbium is: 19.354g, and tungsten titanium valve addition is respectively 85g, makes slurry; With the cordierite honeycomb ceramic carrier dipping,,, obtain catalyst (0.6%) V more then at 550 ℃ of roasting 2h at 150 ℃ of dry 1.5h
2O
5-(10%) Tb
2O
3-(5%) ZrO
2-(8.5%) WO
3-(76.5%) TiO
2, be labeled as catalyst 11.
(Φ (20～40) * (20～40mm)) honeycomb is positioned over respectively in the tubular reactor, and experiment condition is: NO 500ppm, NH with the catalyst of handling well 10 and 11
3500ppm, O
25%, N
2Be balance gas, total gas flow rate is 1500ml/min, air speed 30,000h
-1, the reaction temperature interval is from 150 ℃ to 550 ℃.Online detection NO, NH
3, NO
2, N
2O concentration.In 220～510 ℃ of temperature ranges, the NOx conversion ratio is (to see table one) more than 80%, and particularly in 250～450 ℃ of temperature ranges, the NOx conversion ratio reaches more than 90%.In investigating temperature range, N
2O concentration is less than 50ppm.
Embodiment 3
It is soluble in water to take by weighing 9g oxalic acid, is heated to dissolving fully at 60 ℃, is mixed with 9% oxalic acid aqueous solution.In oxalic acid solution, add the 2.573g ammonium metavanadate, down to dissolving fully, stir 0.5h at 60 ℃ of constant temperature.In above-mentioned solution, add erbium nitrate 23.178g again, at 80 ℃ of constant temperature down to dissolving fully.In above-mentioned solution, add zirconyl nitrate 10.845g again, down to dissolving fully, stir 0.5h at 80 ℃ of constant temperature.In system, add 200ml water, add tungsten titanium valve 85g again, stir 0.5h at 80 ℃ of constant temperature.As binding agent, stir 2h under the room temperature to Ludox that wherein adds mixed liquor volume 20% and aluminium colloidal sol (volume ratio is 1: 1) again, obtain slurry.The blank cordierite honeycomb ceramic carrier is immersed in the slurry, takes out the raffinate in the after-blow clear opening road,,, obtain catalyst (0.6%) V then at 450 ℃ of roasting 3h at 120 ℃ of dry 1.5h
2O
5-(10%) Er
2O
3-(5%) ZrO
2-(8.5%) WO
3-(76.5%) TiO
2, be labeled as catalyst 12.
The ammonium metavanadate addition is constant, and the zirconyl nitrate addition is constant, and the addition that changes the acetic acid erbium is: 21.774g, and tungsten titanium valve addition is respectively 85g, makes slurry; With the cordierite honeycomb ceramic carrier dipping,,, obtain catalyst (0.6%) V more then at 550 ℃ of roasting 2h at 150 ℃ of dry 1.5h
2O
5-(10%) Er
2O
3-(5%) ZrO
2-(8.5%) WO
3-(76.5%) TiO
2, be labeled as catalyst 13.
(Φ (20～40) * (20～40mm)) honeycomb is positioned over respectively in the tubular reactor, and experiment condition is: NO 500ppm, NH with the catalyst of handling well 12 and 13
3500ppm, O
25%, N
2Be balance gas, total gas flow rate is 1500ml/min, air speed 30,000h
-1, the reaction temperature interval is from 150 ℃ to 550 ℃.Online detection NO, NH
3, NO
2, N
2O concentration.In 220～510 ℃ of temperature ranges, the NOx conversion ratio is (to see table one) more than 80%, and particularly in 250～450 ℃ of temperature ranges, the NOx conversion ratio reaches more than 90%.In investigating temperature range, N
2O concentration is less than 50ppm.
Embodiment 4
It is soluble in water to take by weighing 6g oxalic acid, is heated to dissolving fully at 80 ℃, is mixed with 6% oxalic acid aqueous solution.In oxalic acid solution, add the 0.257g ammonium metavanadate, down to dissolving fully, stir 0.5h at 80 ℃ of constant temperature.In above-mentioned solution, add the 12.614g cerous nitrate again, at 80 ℃ of constant temperature down to dissolving fully.In above-mentioned solution, add terbium nitrate 12.383g again, at 80 ℃ of constant temperature down to dissolving fully.In above-mentioned solution, add erbium nitrate 11.589g again, at 80 ℃ of constant temperature down to dissolving fully.In above-mentioned solution, add zirconyl nitrate 10.845g again, down to dissolving fully, stir 0.5h at 80 ℃ of constant temperature.In system, add 200ml water, add tungsten titanium valve 83g again, stir 0.5h at 80 ℃ of constant temperature.Again to the aluminium colloidal sol that wherein adds mixed liquor volume 10% as binding agent, stir 2h under the room temperature, obtain slurry.The blank cordierite honeycomb ceramic carrier is immersed in the slurry, takes out the raffinate in the after-blow clear opening road,,, obtain catalyst (2%) V then at 450 ℃ of roasting 5h at 120 ℃ of dry 1.5h
2O
5-(5%) CeO
2-(5%) Er
2O
3-(5%) Tb
2O
3-(5%) ZrO
2-(8.3%) WO
3-(74.7%) TiO
2, be labeled as catalyst 14.
(Φ (20～40) * (20～40mm)) honeycomb is positioned over respectively in the tubular reactor, and experiment condition is: NO 500ppm, NH with the catalyst of handling well 14
3500ppm, O
25%, N
2Be balance gas, total gas flow rate is 1500ml/min, air speed 50,000h
-1, the reaction temperature interval is from 150 ℃ to 550 ℃.Online detection NO, NH
3, NO
2, N
2O concentration.In 220～510 ℃ of temperature ranges, the NOx conversion ratio is (to see table one) more than 80%, and particularly in 250～450 ℃ of temperature ranges, the NOx conversion ratio reaches more than 90%.In investigating temperature range, N
2O concentration is less than 50ppm.
Embodiment 5
Catalyst 4,10,12 and 14 at 600ppmSO respectively
2+ 14%O
2+ 5%CO
2+ 4.5%H
2O, 200 ℃, air speed 30,000h
-1, the sulphur 29h that wears out.(Φ (20～40) * (20～40mm)) honeycomb is positioned in the tubular reactor respectively that the sulphur burin-in process is good catalyst, and experiment condition is with embodiment 1.In 220～510 ℃ of temperature ranges, the NOx conversion ratio is (to see table two) more than 80%.In investigating temperature range, N
2O concentration is less than 50ppm.
Embodiment 6
Catalyst 3,6,9,11,13 and 14 at 10%H respectively
2O, 750 ℃, air speed 30,000h
-1, hydrothermal aging 16h.(Φ (20～40) * (20～40mm)) honeycomb is positioned in the tubular reactor catalyst of respectively hydrothermal aging being handled well, and experiment condition is with embodiment 1.In 250～500 ℃ of temperature ranges, the NOx conversion ratio is (to see table three) more than 80%.In investigating temperature range, N
2O concentration is less than 50ppm.
Respectively catalyst 3,6,9,11,13 and 14 usefulness inductively coupled plasma spectrum generators (ICP) before and after the hydrothermal aging are carried out the V assay, the result shows: the V loss amount is lower than the equipment detection limit.
The removal of nitrogen oxide efficient of table one different catalysts
Removal of nitrogen oxide efficient after the table two different catalysts sulphur burin-in process
Table three different catalysts hydrothermal aging is handled back removal of nitrogen oxide efficient
Claims (8)
1. a high heat stability catalyst that is used to remove nitrogen oxide is characterized in that, is carrier with the cordierite honeycomb ceramic, forms catalytic active center by vanadium, rare earth, tungsten and titanyl compound, and the mass percent of composition is: V
2O
5Be 0.2%-2%, rare earth oxide is 5%-20%, ZrO
2Be 5%-10%, WO
3And TiO
2Be 68%～89.8%.
2. Preparation of catalysts method according to claim 1 is characterized in that carrying out according to following step:
Active component V
2O
5Form with ammonium metavanadate adds, and content is the 0.2%-2% of catalyst quality percentage composition; Rare earth oxide comprises CeO
2, Er
2O
3And Tb
2O
3In at least a, add with the form of soluble-salt, content is the 5%-20% of catalyst quality percentage composition; ZrO
2Form with the solubility zirconates adds, and content is the 5%-10% of catalyst quality percentage composition; WO
3And TiO
2Form with the tungsten titanium valve adds;
(1) configuration quality percentage is 6～9% oxalic acid aqueous solution;
(2) in the oxalic acid aqueous solution of step (1) preparation, add ammonium metavanadate, soluble ree, solubility zirconates, tungsten titanium valve successively, heated and stirred is even;
(3) in the mixed solution of step (2) preparation, add binding agent, stirring obtains slurry, and the addition of said binding agent is 10～25% of a mixed liquor volume;
(4) cordierite honeycomb ceramic carrier is immersed in the slurry of step (3) preparation, takes out the back earlier at 120～150 ℃ of down dry 1.5～3h, then at 450～550 ℃ of roasting 3～5h.
3. method according to claim 2 is characterized in that, said solubility cerium salt is cerous nitrate, ammonium sulfate cerium or cerous chlorate.
4. method according to claim 2 is characterized in that, said solubility terbium salt is terbium nitrate or acetic acid terbium.
5. method according to claim 2 is characterized in that, said solubility erbium salt is erbium nitrate or acetic acid erbium.
6. method according to claim 2 is characterized in that, said solubility zirconates is zirconyl nitrate, zirconium oxychloride or acetic acid zirconium.
7. method according to claim 2 is characterized in that, said binding agent is at least a in aluminium colloidal sol, the Ludox.
8. method according to claim 2 is characterized in that, in the said step (4), after cordierite honeycomb ceramic carrier flooded taking-up, repeated impregnations and drying were up to reaching the required coated weight of carrier.
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| CN107159304A (en) * | 2017-05-09 | 2017-09-15 | 中国第汽车股份有限公司 | A kind of honeycomb catalyst of nano rare earth doping and preparation method thereof |
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| CN103736497A (en) * | 2014-01-22 | 2014-04-23 | 无锡威孚力达催化净化器有限责任公司 | Vanadium-base SCR (selective catalytic reduction) catalyst for efficiently treating nitric oxides in diesel engine exhaust and preparation method thereof |
| CN107159304A (en) * | 2017-05-09 | 2017-09-15 | 中国第汽车股份有限公司 | A kind of honeycomb catalyst of nano rare earth doping and preparation method thereof |
| CN111068654A (en) * | 2019-12-20 | 2020-04-28 | 山东爱亿普环保科技股份有限公司 | Medium-high temperature SCR denitration catalyst and preparation method thereof |
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