CN103028410A - Preparation method of trinary composite nitric oxide ambient temperature catalyst - Google Patents
Preparation method of trinary composite nitric oxide ambient temperature catalyst Download PDFInfo
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- CN103028410A CN103028410A CN2012105361948A CN201210536194A CN103028410A CN 103028410 A CN103028410 A CN 103028410A CN 2012105361948 A CN2012105361948 A CN 2012105361948A CN 201210536194 A CN201210536194 A CN 201210536194A CN 103028410 A CN103028410 A CN 103028410A
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Abstract
The invention discloses a preparation method of a trinary composite nitric oxide ambient temperature catalyst. The prepared catalyst is applicable to normal-temperature, normal-pressure and low-concentration (NO is not greater than 50ppm) environmental conditions. The preparation method of the trinary composite nitric oxide ambient temperature catalyst is characterized by comprising the following steps of: by taking active aluminum oxide powder as a carrier, dipping and loading cerium chloride and cobalt chloride by an equal volume method; baking, and dipping a mixing solution of copper nitrate and ammonia water; and drying at a low temperature of 150-200 DEG C to obtain a nitric oxide catalytic oxidation catalyst, thereby achieving an ambient temperature catalytic oxidation of nitric oxide. The method disclosed by the invention has the characteristics of simple preparation process, high catalytic oxidation efficiency and the like.
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 tri compound nitric oxide constant temperature catalyzing agent, be applied to the depollution of environment field that the NOx gas pollutant is processed.
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 technique.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 NOx 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 effectively to administer NOx, need NO partly is oxidized to NO
2Therefore, need to seek a kind of effective catalyst and NO be oxidized to the NO that is easier to process
2, absorb with adsorbent again.
In the nitric oxide Catalytic Oxidation, Chinese patent CN101822983A discloses a kind of take mesoporous silicon oxide as carrier, one or both mixtures of potassium, molybdenum are doping component, platinum is active component, adopt the catalyst of the catalytic oxidation nitrogen oxides in effluent of equal-volume step impregnation method preparation, but its technique 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 a kind of method of tri compound nitric oxide catalyst for catalytic oxidation.
The preparation method of alumina base nitric oxide constant temperature catalyzing of the present invention agent is specific as follows:
At first take a certain proportion of cerium chloride and cobalt chloride as raw material, prepare certain density metal salt solution; Take by weighing certain mass, 20～40 purpose active oxidation aluminium powders, with alumina powder 120 ℃ of dry 12h behind normal temperature incipient impregnation 3～5h in mentioned solution; Then 400 ℃ of roasting 3～5h in Muffle furnace;
Take copper nitrate as raw material, be dissolved in the deionized water again, after it fully dissolves, drip ammonia spirit and strong agitation, to pH 7～8;
With the normal temperature incipient impregnation 3～5h in mentioned solution of the alumina powder after the roasting, then 120 ℃ of drying 6～8h; Then at 150～200 ℃ of drying 12～16h, can obtain described nitric oxide catalyst.
The gained catalyst is applicable to normal temperature and pressure, low concentration, and (environmental condition of NO≤50ppm) has that preparation technology is simple, catalytic oxidation efficient high.Compared with prior art, the present invention has that technique is simple, catalytic oxidation efficient high, 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, reaction is carried out under the normal temperature and pressure environment
The present invention is take the aluminium oxide that is untreated as the comparative catalyst, and unstripped gas NO concentration is 50ppm, take air as carrier gas, and 25～30 ℃ of reaction temperatures, relative humidity 30～45%, the testing time is 3h.After saturated through about 0.5h absorption, measuring the NO catalytic conversion is 0～1%, basic non-activity.
The below elaborates to embodiments of the invention: the present embodiment is implemented under take technical solution of the present invention as prerequisite, has provided detailed embodiment and operating process, but that protection scope of the present invention is not limited to is following
The specific embodiment
Embodiment 1:
Take by weighing respectively 0.01mol cerium chloride and cobalt chloride, it fully is dissolved in the 5ml deionized water; Measure approximately 3.25g of 5ml(), 20～40 purpose active oxidation aluminium powders, with alumina powder 120 ℃ of dry 12h behind normal temperature incipient impregnation 3～5h in mentioned solution; Then 400 ℃ of roasting 3～5h in Muffle furnace;
Take by weighing the 0.025mol copper nitrate, be dissolved in the 5ml deionized water, after it fully dissolves, drip ammonia spirit and strong agitation, to pH 8.0;
With the normal temperature incipient impregnation 3～5h in mentioned solution of the alumina powder after the roasting, then 120 ℃ of drying 6～8h; Then at 200 ℃ of drying 12～16h, 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 72%, the 3h.
Embodiment 2:
Take by weighing respectively 0.02mol cerium chloride and cobalt chloride, it fully is dissolved in the 5ml deionized water; Measure approximately 3.25g of 5ml(), 20～40 purpose active oxidation aluminium powders, with alumina powder 120 ℃ of dry 12h behind normal temperature incipient impregnation 3～5h in mentioned solution; Then 400 ℃ of roasting 3～5h in Muffle furnace;
Take by weighing the 0.025mol copper nitrate, be dissolved in the 5ml deionized water, after it fully dissolves, drip ammonia spirit and strong agitation, to pH 8.0;
With the normal temperature incipient impregnation 3～5h in mentioned solution of the alumina powder after the roasting, then 120 ℃ of drying 6～8h; Then at 200 ℃ of drying 12～16h, 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 78%, the 3h.
Embodiment 3:
Take by weighing 0.005mol cerium chloride and 0.02mol cobalt chloride, it fully is dissolved in the 5ml deionized water; Measure approximately 3.25g of 5ml(), 20～40 purpose active oxidation aluminium powders, with alumina powder 120 ℃ of dry 12h behind normal temperature incipient impregnation 3～5h in mentioned solution; Then 400 ℃ of roasting 3～5h in Muffle furnace;
Take by weighing the 0.025mol copper nitrate, be dissolved in the 5ml deionized water, after it fully dissolves, drip ammonia spirit and strong agitation, to pH 8.0;
With the normal temperature incipient impregnation 3～5h in mentioned solution of the alumina powder after the roasting, then 120 ℃ of drying 6～8h; Then at 200 ℃ of drying 12～16h, 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 3h.
Embodiment 4:
Take by weighing 0.005mol cerium chloride and 0.005mol cobalt chloride, it fully is dissolved in the 5ml deionized water; Measure approximately 3.25g of 5ml(), 20～40 purpose active oxidation aluminium powders, with alumina powder 120 ℃ of dry 12h behind normal temperature incipient impregnation 3～5h in mentioned solution; Then 400 ℃ of roasting 3～5h in Muffle furnace;
Take by weighing the 0.025mol copper nitrate, be dissolved in the 5ml deionized water, after it fully dissolves, drip ammonia spirit and strong agitation, to pH 8.0;
With the normal temperature incipient impregnation 3～5h in mentioned solution of the alumina powder after the roasting, then 120 ℃ of drying 6～8h; Then at 200 ℃ of drying 12～16h, 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 60%, the 3h.
Embodiment 5:
Take by weighing 0.02mol cerium chloride and 0.005 cobalt chloride, it fully is dissolved in the 5ml deionized water; Measure approximately 3.25g of 5ml(), 20～40 purpose active oxidation aluminium powders, with alumina powder 120 ℃ of dry 12h behind normal temperature incipient impregnation 3～5h in mentioned solution; Then 400 ℃ of roasting 3～5h in Muffle furnace;
Take by weighing the 0.02mol copper nitrate, be dissolved in the 5ml deionized water, after it fully dissolves, drip ammonia spirit and strong agitation, to pH 8.0;
With the normal temperature incipient impregnation 3～5h in mentioned solution of the alumina powder after the roasting, then 120 ℃ of drying 6～8h; Then at 200 ℃ of drying 12～16h, 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 64%, the 3h.
Claims (5)
1. the preparation method of tri compound nitric oxide constant temperature catalyzing agent, the gained catalyst is applicable to normal temperature and pressure, the low concentration (environmental condition of NO≤50ppm), it is characterized in that, take the active oxidation aluminium powder as carrier, by equi-volume process elder generation dip loading cerium chloride, cobalt chloride, flood again the mixed solution of copper nitrate and ammoniacal liquor after the roasting, after 150 ℃～200 ℃ dryings of low temperature, make the nitric oxide catalyst for catalytic oxidation.
2. the preparation method of described a kind of tri compound nitric oxide constant temperature catalyzing agent according to claim 1 is characterized in that, described cerium chloride, cobalt chloride are respectively 0.001mol～0.004mol/ml with respect to the use amount of used deionized water.
3. the preparation method of described a kind of tri compound nitric oxide constant temperature catalyzing agent according to claim 1, it is characterized in that, described copper nitrate is respectively 0.001mol～0.005mol/ml with respect to the use amount of used deionized water, and the pH value that drips ammoniacal liquor adjusting mixed solution is 7～8.
4. the preparation method of described a kind of tri compound nitric oxide constant temperature catalyzing agent according to claim 1 is characterized in that, reaction condition is normal temperature incipient impregnation after 3～5 hours when described dipping cerium chloride, cobalt chloride, 120 ℃ of dryings 12 hours; Then 400 ℃ of roastings 3～5 hours in Muffle furnace.
5. the preparation method of described a kind of tri compound nitric oxide constant temperature catalyzing agent according to claim 1, it is characterized in that, reaction condition is with the alumina powder solution normal temperature incipient impregnation after the roasting 3～5 hours during described dipping copper nitrate, and then 120 ℃ of dryings are 6～8 hours; Then 150～200 ℃ of dryings 12～16 hours.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109603835A (en) * | 2018-12-19 | 2019-04-12 | 南京工业大学 | A kind of copper cobalt and cerium compound oxide VOCs catalyst for catalytic oxidation and its preparation method and application |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109603835A (en) * | 2018-12-19 | 2019-04-12 | 南京工业大学 | A kind of copper cobalt and cerium compound oxide VOCs catalyst for catalytic oxidation and its preparation method and application |
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Application publication date: 20130410 |