CN102698736B - 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 for removing the high thermal stability Catalysts and its preparation method of nitrogen oxide.
Background technology
In recent years, China NO
xdischarge constantly increases, and ecological environment and human body health have been caused to huge threat and murder by poisoning.NO
xpollution is mainly derived from the moving source discharges such as the stationary source discharges such as coal-fired plant flue gas and motor-vehicle tail-gas.Wherein, thermal power generation is the largest source, accounts for 37% left and right, is secondly vehicular emission, and the 3rd is the discharge of Industrial Boiler stove.According to statistics, within 2010, national discharged nitrous oxides total amount reaches 2273.6 ten thousand tons, brings grave danger to China's atmospheric environment.Along with the quickening of the national economic development, urbanization process and the rapid growth of automobile pollution, how the nitrogen oxides pollution problem that following China faces, by increasingly serious, therefore controls NO cost-effectively
xdischarge, become key issue urgently to be resolved hurrily in China's 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, with TiO
2as carrier, V
2o
5as active component, add WO
3, MoO
3deng as auxiliary agent, in coal-fired plant flue gas denitration, be widely used, and the application of having succeeded on the heavy-duty diesel vehicle that meets Europe IV (2005) and Europe V (2008), the Dan U.S. and Japan are prohibited from using.Poor mainly due to this catalyst high high-temp stability, there is the volatilization of high temperature vanadium, easily bring vanadium secondary pollution problem.Therefore, for V
2o
5-WO
3-TiO
2the deficiency of catalyst system and catalyzing, exploitation high thermal stability, the catalyst simultaneously with high catalytic activity just seems particularly necessary.
Summary of the invention
The object 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 within the scope of wider applied temps, there is high catalytic activity and there is high thermal stability, for removing new catalyst of nitrogen oxide and preparation method thereof.
Technical scheme of the present invention is as follows:
For removing a high heat stability catalyst for nitrogen oxide, take cordierite honeycomb ceramic as carrier, by vanadium, rare earth, tungsten and titanyl compound, form catalytic active center, the mass percent of composition is: V
2o
5for 0.2%-2%, rare earth oxide is 5%-20%, ZrO
2for 5%-10%, WO
3and TiO
2be 68%～89.8%.
The preparation method of catalyst of the present invention, carries 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 one, with the form of soluble-salt, add, content is the 5%-20% of catalyst quality percentage composition; ZrO
2form with solubility zirconates adds, and content is the 5%-10% of catalyst quality percentage composition; WO
3and TiO
2form with tungsten titanium valve adds;
(1) oxalic acid aqueous solution that configuration quality percentage is 6～9%;
(2) in the oxalic acid aqueous solution of preparing to step (1), add successively ammonium metavanadate, soluble ree, solubility zirconates, tungsten titanium valve, heating stirs;
(3) in the mixed solution of preparing to step (2), add binding agent, stir and obtain slurry, the addition of described binding agent is mixed liquor volume 10～25%;
(4) cordierite honeycomb ceramic carrier is immersed in slurry prepared by step (3), first dry 1.5～3h at 120～150 ℃ after taking out, then at 450～550 ℃ of roasting 3～5h.
Described solubility cerium salt is cerous nitrate, ammonium sulfate cerium or cerous chlorate.Described solubility terbium salt is terbium nitrate or acetic acid terbium.Described solubility erbium salt is erbium nitrate or acetic acid erbium.Described solubility zirconates is zirconyl nitrate, zirconium oxychloride or acetic acid zirconium.Described binding agent is at least one in aluminium colloidal sol, Ludox.
In described step (4), after cordierite honeycomb ceramic carrier floods and takes out, repeated impregnations and dry, until reach the required coated weight of carrier.
Removal of nitrogen oxide catalyst tool provided by the invention has the following advantages: in 220-510 ℃ of temperature range, can realize efficient catalytic and remove nitrogen oxide (conversion ratio is greater than 80%), meanwhile, have good water resistant heat ageing and SO
2aging ability can be applicable to exhaust gas from diesel vehicle NO
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.
Accompanying drawing explanation
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
Below in conjunction with specific embodiment, further technical scheme of the present invention is described.
The embodiment of the present invention is used tungsten titanium valve (DT-52, Mei Lian inorganic chemical industry company) to comprise tungstic acid and titanium dioxide, contains mass percent and be 10% WO
3, all the other are TiO
2.
Embodiment 1
Take 6g oxalic acid soluble in water, at 80 ℃, be heated to dissolve completely, be mixed with 6% oxalic acid aqueous solution.In oxalic acid solution, add 0.257g ammonium metavanadate, at 80 ℃ of constant temperature, down to dissolving completely, stir 0.5h.In above-mentioned solution, add 12.614g cerous nitrate again, at 80 ℃ of constant temperature down to dissolving completely.In above-mentioned solution, add zirconyl nitrate 10.845g again, at 80 ℃ of constant temperature, down to dissolving completely, stir 0.5h.In system, add 200ml water, then add tungsten titanium valve 90g, at 80 ℃ of constant temperature, stir 0.5h.Add wherein again the aluminium colloidal sol of mixed liquor volume 10% as binding agent, under room temperature, stir 2h, obtain slurry.Blank cordierite honeycomb ceramic carrier is immersed in slurry, takes out the raffinate in after-blow clear opening road, at 120 ℃ of dry 1.5h, then at 450 ℃ of roasting 5h, obtain catalyst (0.2%) V
2o
5-(5%) CeO
2-(5%) ZrO
2-(9%) WO
3-(81%) TiO
2, be labeled as catalyst 1.
Ammonium metavanadate addition is constant, and 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 cordierite honeycomb ceramic carrier dipping, at 150 ℃ of dry 3h, then at 500 ℃ of roasting 3h, obtain respectively catalyst (0.2%) V again
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 respectively catalyst 2, catalyst 3.
Ammonium metavanadate addition is constant, and the addition of cerous nitrate is constant, changes zirconyl nitrate addition to be: 17.352g, and 21.69g, tungsten titanium valve addition is respectively: 87g and 85g, make slurry; With cordierite honeycomb ceramic carrier dipping, at 130 ℃ of dry 2h, then at 550 ℃ of roasting 4h, obtain respectively catalyst (0.2%) V again
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 respectively catalyst 4, catalyst 5.
Ammonium metavanadate addition is constant, and zirconyl nitrate addition is constant, and the addition that changes ammonium sulfate cerium is: 19.421g, and tungsten titanium valve addition is respectively 90g, makes slurry; With cordierite honeycomb ceramic carrier dipping, at 120 ℃ of dry 1.5h, then at 450 ℃ of roasting 3h, obtain catalyst (0.2%) V again
2o
5-(5%) CeO
2-(5%) ZrO
2-(9%) WO
3-(81%) TiO
2, be labeled as catalyst 6.
Ammonium metavanadate addition is constant, and 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 cordierite honeycomb ceramic carrier dipping, at 150 ℃ of dry 1.5h, then at 450 ℃ of roasting 3h, obtain catalyst (0.2%) V again
2o
5-(5%) CeO
2-(5%) ZrO
2-(9%) WO
3-(81%) TiO
2, be labeled as catalyst 7.
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 cordierite honeycomb ceramic carrier dipping, at 140 ℃ of dry 1.5h, then at 450 ℃ of roasting 3h, obtain catalyst (0.2%) V again
2o
5z-(5%) CeO
2-(5%) ZrO
2-(9%) WO
3-(81%) TiO
2, be labeled as catalyst 8.
Ammonium metavanadate addition is constant, and the addition of cerous nitrate is constant, and the addition that changes acetic acid zirconium is: 13.285g, and tungsten titanium valve addition is respectively: 90g, makes slurry; With cordierite honeycomb ceramic carrier dipping, at 120 ℃ of dry 1.5h, then at 450 ℃ of roasting 3h, obtain catalyst (0.2%) V again
2o
5-(5%) CeO
2-(5%) ZrO
2-(9%) WO
3-(81%) TiO
2, be labeled as catalyst 9.
The catalyst of handling well 1,2,3,4,5,6,7,8 and 9 (Φ (20～40) * (20～40mm)) honeycomb is positioned over respectively 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 150 ℃ to 550 ℃.Online NO, the NH of detecting
3, NO
2, N
2o concentration.In 220～510 ℃ of temperature ranges, NOx conversion ratio is more than 80% (in Table one), particularly 250～450.In ℃ temperature range, as shown in Figure 1, for the NOx of catalyst 1 removes performance curve, NOx conversion ratio reaches more than 90%.In investigating temperature range, N
2o concentration is less than 50ppm.
Embodiment 2
Take 8g oxalic acid soluble in water, at 60 ℃, be heated to dissolve completely, be mixed with 8% oxalic acid aqueous solution.In oxalic acid solution, add 0.771g ammonium metavanadate, at 60 ℃ of constant temperature, down to dissolving completely, stir 0.5h.In above-mentioned solution, add terbium nitrate 24.766g again, at 80 ℃ of constant temperature down to dissolving completely.In above-mentioned solution, add zirconyl nitrate 10.845g again, at 80 ℃ of constant temperature, down to dissolving completely, stir 0.5h.In system, add 200ml water, then add tungsten titanium valve 85g, at 80 ℃ of constant temperature, stir 0.5h.Add wherein again the Ludox of mixed liquor volume 25% as binding agent, under room temperature, stir 2h, obtain slurry.Blank cordierite honeycomb ceramic carrier is immersed in slurry, takes out the raffinate in after-blow clear opening road, at 120 ℃ of dry 1.5h, then at 450 ℃ of roasting 5h, obtain catalyst (0.6%) V
2o
5-(10%) Tb
2o
3-(5%) ZrO
2-(8.5%) WO
3-(76.5%) TiO
2, be labeled as catalyst 10.
Ammonium metavanadate addition is constant, and zirconyl nitrate addition is constant, and the addition that changes acetic acid terbium is: 19.354g, and tungsten titanium valve addition is respectively 85g, makes slurry; With cordierite honeycomb ceramic carrier dipping, at 150 ℃ of dry 1.5h, then at 550 ℃ of roasting 2h, obtain catalyst (0.6%) V again
2o
5-(10%) Tb
2o
3-(5%) ZrO
2-(8.5%) WO
3-(76.5%) TiO
2, be labeled as catalyst 11.
The catalyst of handling well 10 and 11 (Φ (20～40) * (20～40mm)) honeycomb is positioned over respectively 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 150 ℃ to 550 ℃.Online NO, the NH of detecting
3, NO
2, N
2o concentration.In 220～510 ℃ of temperature ranges, NOx conversion ratio is more than 80% (in Table one), and particularly, in 250～450 ℃ of temperature ranges, NOx conversion ratio reaches more than 90%.In investigating temperature range, N
2o concentration is less than 50ppm.
Embodiment 3
Take 9g oxalic acid soluble in water, at 60 ℃, be heated to dissolve completely, be mixed with 9% oxalic acid aqueous solution.In oxalic acid solution, add 2.573g ammonium metavanadate, at 60 ℃ of constant temperature, down to dissolving completely, stir 0.5h.In above-mentioned solution, add erbium nitrate 23.178g again, at 80 ℃ of constant temperature down to dissolving completely.In above-mentioned solution, add zirconyl nitrate 10.845g again, at 80 ℃ of constant temperature, down to dissolving completely, stir 0.5h.In system, add 200ml water, then add tungsten titanium valve 85g, at 80 ℃ of constant temperature, stir 0.5h.Add wherein again Ludox and the aluminium colloidal sol (volume ratio is 1: 1) of mixed liquor volume 20% as binding agent, under room temperature, to stir 2h, obtain slurry.Blank cordierite honeycomb ceramic carrier is immersed in slurry, takes out the raffinate in after-blow clear opening road, at 120 ℃ of dry 1.5h, then at 450 ℃ of roasting 3h, obtain catalyst (0.6%) V
2o
5-(10%) Er
2o
3-(5%) ZrO
2-(8.5%) WO
3-(76.5%) TiO
2, be labeled as catalyst 12.
Ammonium metavanadate addition is constant, and zirconyl nitrate addition is constant, and the addition that changes acetic acid erbium is: 21.774g, and tungsten titanium valve addition is respectively 85g, makes slurry; With cordierite honeycomb ceramic carrier dipping, at 150 ℃ of dry 1.5h, then at 550 ℃ of roasting 2h, obtain catalyst (0.6%) V again
2o
5-(10%) Er
2o
3-(5%) ZrO
2-(8.5%) WO
3-(76.5%) TiO
2, be labeled as catalyst 13.
The catalyst of handling well 12 and 13 (Φ (20～40) * (20～40mm)) honeycomb is positioned over respectively 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 150 ℃ to 550 ℃.Online NO, the NH of detecting
3, NO
2, N
2o concentration.In 220～510 ℃ of temperature ranges, NOx conversion ratio is more than 80% (in Table one), and particularly, in 250～450 ℃ of temperature ranges, NOx conversion ratio reaches more than 90%.In investigating temperature range, N
2o concentration is less than 50ppm.
Embodiment 4
Take 6g oxalic acid soluble in water, at 80 ℃, be heated to dissolve completely, be mixed with 6% oxalic acid aqueous solution.In oxalic acid solution, add 0.257g ammonium metavanadate, at 80 ℃ of constant temperature, down to dissolving completely, stir 0.5h.In above-mentioned solution, add 12.614g cerous nitrate again, at 80 ℃ of constant temperature down to dissolving completely.In above-mentioned solution, add terbium nitrate 12.383g again, at 80 ℃ of constant temperature down to dissolving completely.In above-mentioned solution, add erbium nitrate 11.589g again, at 80 ℃ of constant temperature down to dissolving completely.In above-mentioned solution, add zirconyl nitrate 10.845g again, at 80 ℃ of constant temperature, down to dissolving completely, stir 0.5h.In system, add 200ml water, then add tungsten titanium valve 83g, at 80 ℃ of constant temperature, stir 0.5h.Add wherein again the aluminium colloidal sol of mixed liquor volume 10% as binding agent, under room temperature, stir 2h, obtain slurry.Blank cordierite honeycomb ceramic carrier is immersed in slurry, takes out the raffinate in after-blow clear opening road, at 120 ℃ of dry 1.5h, then at 450 ℃ of roasting 5h, obtain catalyst (2%) V
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.
The catalyst of handling well 14 (Φ (20～40) * (20～40mm)) honeycomb is positioned over respectively 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 50,000h
-1, reaction temperature interval is from 150 ℃ to 550 ℃.Online NO, the NH of detecting
3, NO
2, N
2o concentration.In 220～510 ℃ of temperature ranges, NOx conversion ratio is more than 80% (in Table one), and particularly, in 250～450 ℃ of temperature ranges, 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 aging 29h of sulphur.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 220～510 ℃ of temperature ranges, NOx conversion ratio is more than 80% (in Table two).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.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 250～500 ℃ of temperature ranges, NOx conversion ratio is more than 80% (in Table three).In investigating temperature range, N
2o concentration is less than 50ppm.
Respectively catalyst 3,6,9,11,13 and 14 use inductively coupled plasma spectrum generators (ICP) before and after hydrothermal aging are carried out to V assay, result shows: V loss amount is lower than equipment detection limit.
The removal of nitrogen oxide efficiency of table one different catalysts
Removal of nitrogen oxide efficiency after table two different catalysts sulphur burin-in process
Table three different catalysts hydrothermal aging is processed rear removal of nitrogen oxide efficiency
Claims (4)
1. the high heat stability catalyst removing for exhaust gas from diesel vehicle NOx, is characterized in that, take cordierite honeycomb ceramic as carrier, by vanadium, rare earth, tungsten and titanyl compound, forms catalytic active center, and the mass percent of composition is: V
2o
5for 0.2%-2%, rare earth oxide is 5%-20%, ZrO
2for 5%-10%, WO
3and TiO
2be 68%～89.8%; Wherein, rare earth oxide is CeO
2, Er
2o
3and Tb
2o
3in at least one.
2. the preparation method of catalyst according to claim 1, is characterized in that carrying out according to following step:
(1) oxalic acid aqueous solution that configuration quality percentage is 6～9%;
(2) in the oxalic acid aqueous solution of preparing to step (1), add successively ammonium metavanadate, soluble rare-earth salt, solubility zirconates, tungsten titanium valve, heating stirs;
(3) in the mixed solution of preparing to step (2), add binding agent, stir and obtain slurry, the addition of described binding agent is mixed liquor volume 10～25%;
(4) cordierite honeycomb ceramic carrier is immersed in slurry prepared by step (3), first dry 1.5～3h at 120～150 ℃ after taking out, then at 450～550 ℃ of roasting 3～5h.
3. method according to claim 2, is characterized in that, described binding agent is at least one in aluminium colloidal sol, Ludox.
4. method according to claim 2, is characterized in that, in described step (4), after cordierite honeycomb ceramic carrier floods and takes out, repeated impregnations and dry, until reach the required coated weight of carrier.
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| CN103657637B (en) * | 2013-12-11 | 2015-07-15 | 河南理工大学 | Preparation method of automobile exhaust catalyst |
| CN103736497B (en) * | 2014-01-22 | 2016-01-27 | 无锡威孚力达催化净化器有限责任公司 | The vanadia-based SCR catalysts and preparation method thereof of nitrogen oxide in efficient process diesel engine vent gas |
| 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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| CN101912775A (en) * | 2010-09-03 | 2010-12-15 | 中国汽车技术研究中心 | Selective catalyst for removing oxynitrides from tail gases of diesel vehicles and preparation method thereof |
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Effective date of registration: 20230223 Address after: Room 526, main building, No. 68, Xianfeng East Road, Dongli District, Tianjin Patentee after: CATARC AUTOMOTIVE TEST CENTER (TIANJIN) Co.,Ltd. Patentee after: CHINA AUTOMOTIVE TECHNOLOGY AND RESEARCH CENTER Co.,Ltd. Address before: 300462 Auxiliary room, No. 19, Xinye 5th Street, West District, Binhai New Area Development Zone, Tianjin Patentee before: CATARC (TIANJIN) AUTOMOTIVE ENGINEERING RESEARCH INSTITUTE Co.,Ltd. |
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