CN103263925A - Cerium-zirconium base nitric oxide common temperature catalyst preparation method - Google Patents
Cerium-zirconium base nitric oxide common temperature catalyst preparation method Download PDFInfo
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Abstract
The invention provides a cerium-zirconium base nitric oxide common temperature catalyst preparation method, which is characterized by comprising: adopting active alumina powder as a carrier, carrying out cerium nitrate and zirconium nitrate impregnating loading, calcining, carrying out copper acetate and ammonia water mixed solution impregnating, and carrying out low temperature drying to obtain the catalyst so as to achieve common temperature catalysis oxidation on nitric oxide. Compared with the preparation method in the prior art, the preparation method of the present invention has characteristics of simple process, high catalysis efficiency and the like, wherein NO oxidation absorption efficiency is significantly increased.
Description
Technical field
The present invention relates to a kind of preparation method of constant temperature catalyzing agent, particularly relate to the preparation method of a kind of cerium zirconium base nitric oxide constant temperature catalyzing agent, be applied to the depollution of environment field that the NOx gas pollutant is handled.
Background technology
In various atmosphere pollutions, NO
XPollution and the harm that causes can not be ignored.NOx comes from fuel combustion mostly, i.e. vehicle exhaust, Industrial Stoves emission etc.The NOx purified treatment can be divided into dry method and wet method by technology.Dry method comprises non-catalytic reduction method, catalytic reduction method, absorption method etc.; Wet method comprises acid absorption, alkali absorption, oxidation absorption etc.
Oxidation absorption of N Ox is one of current research direction under the excess oxygen.Because 90%～95% is NO in the combustion product gases, and NO is not absorbed in water or in the alkali lye except generating complex compound.In order to administer NOx effectively, need NO partly is oxidized to NO
2So, need to seek a kind of effective catalyst and NO be oxidized to the NO that is easier to handle
2, absorb with adsorbent again.
In the nitric oxide Catalytic Oxidation, it is carrier with the mesoporous silicon oxide that Chinese patent CN101822983A discloses a kind of, one or both mixtures of potassium, molybdenum are doping component, platinum is active component, the catalyst of nitrogen oxide in the catalytic oxidation flue gas of employing equal-volume step impregnation method preparation, but its technology is complicated, and reaction temperature is higher at 150～300 ℃.Chinese patent CN101352645 discloses a kind of flue gas catalytic oxidation denitration technique, adopts with TiO
2Or ZrO
2-TiO
2Be carrier, Co is the catalyst of active component, but its described reaction temperature is too high equally, is not suitable for the NOx purified treatment under the normal temperature condition.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides the preparation method of a kind of cerium zirconium base nitric oxide constant temperature catalyzing agent.
The preparation method of a kind of cerium zirconium base nitric oxide constant temperature catalyzing agent, it is characterized in that, be carrier with the active oxidation aluminium powder, by first dip loading cerous nitrate and zirconium nitrate, flood the mixed solution of copper acetate and ammoniacal liquor after the roasting again, after low temperature drying, make catalyst, realize nitric oxide production room-temperature catalytic oxidation.
The mol ratio of described cerous nitrate and zirconium nitrate is 1:1, cerous nitrate and zirconium nitrate with respect to the use amount of used deionized water respectively at 0.001mol～0.002mol/ml.
Respectively at 0.001mol～0.003mol/ml, the pH value that dropping ammonia is regulated mixed solution is 7 to described sour copper with respect to the use amount of used deionized water.
Reaction condition is normal temperature dipping after 1～2 hour when described dipping cerium chloride, cobalt chloride, 120 ℃ of dryings 3 hours; 500 ℃ of roastings 3～5 hours in Muffle furnace then; Dipping during copper acetate reaction condition be alumina powder after roasting normal temperature dipping 1～2 hour in above-mentioned solution, 150～200 ℃ of dryings 10～12 hours, can obtain described nitric oxide catalyst then.
The object of the present invention is to provide a kind of is carrier with the aluminium oxide, and cerium zirconium sosoloid is auxiliary agent, prepares the method for nitric oxide catalyst for catalytic oxidation.The gained catalyst is applicable to normal temperature and pressure, low concentration, and (environmental condition of NO≤50ppm) has characteristics such as preparation technology is simple, catalytic oxidation efficient height.
Compared with prior art, the present invention has characteristics such as technology is simple, catalytic oxidation efficient height, and NO oxidation absorption efficiency is significantly improved.
Catalyst performance evaluation is carried out in column type glass tube reactor, and reaction gas volume air speed (GHSV) is 25000h
-1, catalyst amount 5ml is reflected under the normal temperature and pressure environment and carries out
The present invention is the comparative catalyst with the aluminium oxide that is untreated, and unstripped gas NO concentration is 50ppm, is carrier gas with the air, 25～30 ℃ of reaction temperatures, and relative humidity 30～45%, the testing time is 5h.After saturated through about 0.5h absorption, measuring the NO catalytic conversion is 0～1%, basic non-activity.
The specific embodiment
Below embodiments of the invention are elaborated: present embodiment has provided detailed embodiment and operating process being to implement under the prerequisite with the technical solution of the present invention, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1:
Take by weighing 0.01mol cerous nitrate and zirconium nitrate respectively, it fully is dissolved in the 5ml deionized water; Measure the about 3.25g of 5ml(), 20～40 purpose active oxidation aluminium powders, with alumina powder 120 ℃ of dry 3h behind the normal temperature dipping 1h in above-mentioned solution; 500 ℃ of roasting 4h in Muffle furnace then;
Take by weighing the 0.01mol copper acetate, be dissolved in the 5ml deionized water, treat that it fully dissolves after, dropping ammonia solution and strong agitation, to the pH value of solution value 7.0;
With the normal temperature dipping 1h in above-mentioned solution of the alumina powder after the roasting, then at 150 ℃ of drying 10～12h, can obtain described nitric oxide catalyst.
Made catalyst is carried out catalytic performance test according to the afore-mentioned test condition, and measuring NO catalytic oxidation efficient is that catalytic effect is basicly stable in 70%, the 5h.
Embodiment 2:
Take by weighing 0.01mol cerous nitrate and zirconium nitrate respectively, it fully is dissolved in the 5ml deionized water; Measure the about 3.25g of 5ml(), 20～40 purpose active oxidation aluminium powders, with alumina powder 120 ℃ of dry 3h behind the normal temperature dipping 1h in above-mentioned solution; 500 ℃ of roasting 5h in Muffle furnace then;
Take by weighing the 0.015mol copper acetate, be dissolved in the 5ml deionized water, treat that it fully dissolves after, dropping ammonia solution and strong agitation, to the pH value of solution value 7.0;
With the normal temperature dipping 1h in above-mentioned solution of the alumina powder after the roasting, then at 150 ℃ of dry 12h, can obtain described nitric oxide catalyst.
Made catalyst is carried out catalytic performance test according to the afore-mentioned test condition, and measuring NO catalytic oxidation efficient is that catalytic effect is basicly stable in 76%, the 5h.
Embodiment 3:
Take by weighing 0.005mol cerous nitrate and zirconium nitrate respectively, it fully is dissolved in the 5ml deionized water; Measure the about 3.25g of 5ml(), 20～40 purpose active oxidation aluminium powders, with alumina powder 120 ℃ of dry 3h behind the normal temperature dipping 1h in above-mentioned solution; 500 ℃ of roasting 4h in Muffle furnace then;
Take by weighing the 0.015mol copper acetate, be dissolved in the 5ml deionized water, treat that it fully dissolves after, dropping ammonia solution and strong agitation, to the pH value of solution value 7.0;
With the normal temperature dipping 1h in above-mentioned solution of the alumina powder after the roasting, then at 150 ℃ of dry 12h, can obtain described nitric oxide catalyst.
Made catalyst is carried out catalytic performance test according to the afore-mentioned test condition, and measuring NO catalytic oxidation efficient is that catalytic effect is basicly stable in 65%, the 5h.
Embodiment 4:
Take by weighing 0.005mol cerous nitrate and zirconium nitrate respectively, it fully is dissolved in the 5ml deionized water; Measure the about 3.25g of 5ml(), 20～40 purpose active oxidation aluminium powders, with alumina powder 120 ℃ of dry 3h behind the normal temperature dipping 1h in above-mentioned solution; 500 ℃ of roasting 5h in Muffle furnace then;
Take by weighing the 0.015mol copper acetate, be dissolved in the 5ml deionized water, treat that it fully dissolves after, dropping ammonia solution and strong agitation, to the pH value of solution value 7.0;
With the normal temperature dipping 1h in above-mentioned solution of the alumina powder after the roasting, then at 200 ℃ of dry 10h, can obtain described nitric oxide catalyst.
Made catalyst is carried out catalytic performance test according to the afore-mentioned test condition, and measuring NO catalytic oxidation efficient is that catalytic effect is basicly stable in 70%, the 5h.
Embodiment 5:
Take by weighing 0.01mol cerous nitrate and zirconium nitrate respectively, it fully is dissolved in the 5ml deionized water; Measure the about 3.25g of 5ml(), 20～40 purpose active oxidation aluminium powders, with alumina powder 120 ℃ of dry 3h behind the normal temperature dipping 1h in above-mentioned solution; 500 ℃ of roasting 4h in Muffle furnace then;
Take by weighing the 0.005mol copper acetate, be dissolved in the 5ml deionized water, treat that it fully dissolves after, dropping ammonia solution and strong agitation, to the pH value of solution value 7.0;
With the normal temperature dipping 1h in above-mentioned solution of the alumina powder after the roasting, then at 150 ℃ of dry 12h, can obtain described nitric oxide catalyst.
Made catalyst is carried out catalytic performance test according to the afore-mentioned test condition, and measuring NO catalytic oxidation efficient is that catalytic effect is basicly stable in 62%, the 5h.
Claims (4)
1. the preparation method of cerium zirconium base nitric oxide constant temperature catalyzing agent, it is characterized in that, be carrier with the active oxidation aluminium powder, by first dip loading cerous nitrate and zirconium nitrate, flood the mixed solution of copper acetate and ammoniacal liquor after the roasting again, after low temperature drying, make catalyst, realize nitric oxide production room-temperature catalytic oxidation.
2. according to the preparation method of the described a kind of cerium zirconium base nitric oxide constant temperature catalyzing of claim 1 agent, it is characterized in that, the mol ratio of described cerous nitrate and zirconium nitrate is 1:1, and cerous nitrate and zirconium nitrate are respectively 0.001mol～0.002mol/ml with respect to the use amount of used deionized water.
3. according to the preparation method of the described a kind of cerium zirconium base nitric oxide constant temperature catalyzing of claim 1 agent, it is characterized in that, described sour copper is respectively 0.001mol～0.003mol/ml with respect to the use amount of used deionized water, and the pH value that dropping ammonia is regulated mixed solution is 7.
4. according to the preparation method of the described a kind of cerium zirconium base nitric oxide constant temperature catalyzing of claim 1 agent, it is characterized in that reaction condition is normal temperature dipping after 1～2 hour when described dipping cerium chloride, cobalt chloride, 120 ℃ of dryings 3 hours; 500 ℃ of roastings 3～5 hours in Muffle furnace then; Dipping during copper acetate reaction condition be alumina powder after roasting normal temperature dipping 1～2 hour in above-mentioned solution, 150～200 ℃ of dryings 10～12 hours, can obtain described nitric oxide catalyst then.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105423435A (en) * | 2015-11-28 | 2016-03-23 | 成都德善能科技有限公司 | Indoor air purification method |
| CN105498474A (en) * | 2015-11-28 | 2016-04-20 | 成都德善能科技有限公司 | Air purification method |
| CN108251697A (en) * | 2017-12-15 | 2018-07-06 | 昆明理工大学 | A kind of low temperature resistant high-strength and high ductility alloy |
| CN113289616A (en) * | 2021-06-17 | 2021-08-24 | 南京工业大学 | Catalyst for NO oxidation and preparation method thereof |
| CN114917906A (en) * | 2022-04-21 | 2022-08-19 | 山东亮剑环保新材料有限公司 | Preparation method of supported copper oxide catalyst |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103007955A (en) * | 2012-12-26 | 2013-04-03 | 湖南稀土金属材料研究院 | Cleaning catalyst for automobile exhaust and preparation method of cleaning catalyst carrier |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103007955A (en) * | 2012-12-26 | 2013-04-03 | 湖南稀土金属材料研究院 | Cleaning catalyst for automobile exhaust and preparation method of cleaning catalyst carrier |
Non-Patent Citations (1)
| Title |
|---|
| 张可新: "CuO/Ce0.9Zr0.1-Al2O3催化剂的合成及其催化CO还原NO的研究", 《中国优秀硕士学位论文全文数据库 工程科技I辑》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105423435A (en) * | 2015-11-28 | 2016-03-23 | 成都德善能科技有限公司 | Indoor air purification method |
| CN105498474A (en) * | 2015-11-28 | 2016-04-20 | 成都德善能科技有限公司 | Air purification method |
| CN105423435B (en) * | 2015-11-28 | 2018-07-13 | 南京绿征环保科技有限公司 | A kind of indoor air purification method |
| CN108251697A (en) * | 2017-12-15 | 2018-07-06 | 昆明理工大学 | A kind of low temperature resistant high-strength and high ductility alloy |
| CN113289616A (en) * | 2021-06-17 | 2021-08-24 | 南京工业大学 | Catalyst for NO oxidation and preparation method thereof |
| CN114917906A (en) * | 2022-04-21 | 2022-08-19 | 山东亮剑环保新材料有限公司 | Preparation method of supported copper oxide catalyst |
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