CN104689856A - Method for preparing automobile tail gas purification catalyst carrier - Google Patents
Method for preparing automobile tail gas purification catalyst carrier Download PDFInfo
- Publication number
- CN104689856A CN104689856A CN201510072323.6A CN201510072323A CN104689856A CN 104689856 A CN104689856 A CN 104689856A CN 201510072323 A CN201510072323 A CN 201510072323A CN 104689856 A CN104689856 A CN 104689856A
- Authority
- CN
- China
- Prior art keywords
- cordierite
- al2o3
- solution
- gamma
- tail gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The invention relates to the field of automobile tail gas purification catalysts, and in particular to relates to a method for preparing an automobile tail gas purification catalyst carrier. The method comprises the following steps: dissolving prepared Al(NO3)3 in water, stirring, dropping ammonia water, simultaneously adding La(NO3)3, continuously stirring, standing, aging so as to obtain gamma-Al2O3, and further preparing a gamma-Al2O3 aluminum adhesive; putting cordierite into the aluminum adhesive for soaking; taking out the soaked cordierite, and blowing off the aluminum adhesive in pores; and drying, and roasting. By adopting the method, the gamma-Al2O3 activated coating carrier can be prepared, due to addition of La(NO3)3 in dropping of the ammonia water, ion surface diffusion and structural rearrangement which can cause gamma-Al2O3 phase change and sintering can be prevented, the loss of a comparative area can be effectively reduced, and moreover the gamma-Al2O3 aluminum adhesive can be relatively well loaded on cordierite through soaking.
Description
Technical field
The present invention relates to cleaning catalyst for tail gases of automobiles field, is the preparation method of catalyst carrier for purifying vehicle tail gas specifically.
Background technology
Along with the increase of automobile pollution, CO, HC, NO that automobile discharges in air
xmore and more.At present, many countries take strict control discharge measure to motor vehicle exhaust emission.Therefore the process of vehicle exhaust becomes important problem day by day.In the prior art, be by installing catalytic cleaner additional to realize to the control of motor vehicle exhaust emission, and the key of catalytic cleaner is catalyst.Catalyst adopts three-decker to be namely made up of active component, washcoat and carrier usually, and wherein washcoat plays as active component provides high-specific surface area, the effect of bonding carrier and activating component.What washcoat material was conventional has γ-Al
2o
3, TiO
2and SiO
2deng.Due to γ-Al
2o
3low price, preparation technology simply becomes most widely used washcoat material.But, γ-Al
2o
3high high-temp stability poor, all the more so especially under hydrothermal conditions, easily cause sintering and phase transformation its specific area is significantly declined, cause the irreversible inactivation of catalyst.
Summary of the invention
For above-mentioned technical problem, the invention provides can increasing specific surface area, the preparation method of the good catalyst carrier for purifying vehicle tail gas of load effect.
The present invention solves the problems of the technologies described above adopted technical scheme: the preparation method of catalyst carrier for purifying vehicle tail gas, and it carries out according to the following steps:
(1) by Al(NO that proportioning is good
3)
3to be dissolved in water and to stir, then dripping ammoniacal liquor, add La(NO simultaneously
3)
3, continue to stir, then leave standstill aging, obtain γ-Al
2o
3, then make γ-Al
2o
3aluminium glue;
(2) cordierite is put into above-mentioned aluminium glue to flood;
(3) cordierite after dipping is taken out, and blow away the aluminium glue in duct;
(4) dry again, roasting.
As preferably, in step (1), ammoniacal liquor dropwises rear stirring, then adopts red fuming nitric acid (RFNA) residual titration to solution be clear, then continues stirring.
As preferably, Al(NO in step (1)
3)
3hydrolysis temperature is 70 DEG C--90 DEG C, and Al(NO
3)
3the concentration of solution is 0.6g/ml--0.8 g/ml.
As preferably, the mole dosage of ammoniacal liquor is Al
3+: NH
3=1:3, the pH=8--9 of solution.
As preferably, La(NO
3)
3the 2%--4% accounting for solution gross mass.
As preferably, ageing time is 10h-14h.
As preferably, bake out temperature is 60 DEG C--80 DEG C
As preferably, sintering temperature is 600 DEG C, and roasting time is 4h.
As can be known from the above technical solutions, γ-Al can be prepared by above-mentioned steps
2o
3washcoat carrier, the method adds La(NO when dripping ammoniacal liquor
3)
3prevent and cause γ-Al
2o
3the ion surface diffusion of phase transformation and sintering and structural rearrangement, reduce the loss of reference area effectively; And by dipping can load preferably on cordierite.
Detailed description of the invention
Introduce the preparation method of catalyst carrier for purifying vehicle tail gas in detail below in conjunction with embodiment, it carries out according to the following steps:
First, Al(NO is hydrolyzed
3)
3, should stir during hydrolysis; 70 DEG C are kept during hydrolysis--90 DEG C of temperature, and Al(NO
3)
3the concentration of solution should remain between 0.6g/ml--0.8 g/ml, and this condition can improve stability and the load quality of follow-up colloidal sol.
In above-mentioned solution, drip ammonia spirit again, regulate the pH value of solution, while dropping ammoniacal liquor, add La(NO
3)
3, can increasing specific surface area; Ammoniacal liquor dropwises rear stirring, then adopts red fuming nitric acid (RFNA) residual titration to solution is clear, then continues to stir, and the consumption of ammoniacal liquor is: Al
3+: NH
3=1:(2--4), the pH=8--9 of solution.Colloidal sol obtained like this can long-time stable be placed, and meets Infusion entails; As preferably, La(NO
3)
3addition account for the 2%--4% of solution gross mass.
Then, to the aging 10h-14h of above-mentioned solution left standstill, thus the γ-Al of obtained high-specific surface area
2o
3washcoat material, then by γ-Al
2o
3make aluminium glue.
Then, the cordierite that pretreatment is good is put into above-mentioned aluminium glue and floods more than 8h, then the cordierite after dipping is taken out, and blow away the aluminium glue in duct; Adopting 60 DEG C again--80 DEG C of temperature are dried, finally at roasting temperature about the 4h of 600 DEG C, and repeated loading, make load capacity reach the mass fraction of more than 15%.
Embodiment 1
The Al(NO good by proportioning
3)
3be dissolved in water, stir at the temperature of 70 DEG C, then dropwise drip ammoniacal liquor, add La(NO simultaneously
3)
3, in solution, ensure Al
3+: NH
3=1:3, Al(NO
3)
3concentration is 0.6g/ml, pH=8, La(NO
3)
3addition account for 2% of solution gross mass, continue stir more than 2h; Then aging 10h is left standstill, then by γ-Al
2o
3make aluminium glue, then put into cordierite dipping 8h, take out the aluminium glue blowing away duct, 60 DEG C of oven dry, 600 DEG C of roasting 4h.Obtain γ-Al by analysis
2o
3specific area can reach 385.43m
2/ g, and can load preferably on cordierite.
Embodiment 2
The Al(NO good by proportioning
3)
3be dissolved in water, stir at the temperature of 80 DEG C, then dropwise drip ammoniacal liquor, add La(NO simultaneously
3)
3, in solution, ensure Al
3+: NH
3=1:3, Al(NO
3)
3concentration is 0.7g/ml, pH=8, La(NO
3)
3addition account for 3% of solution gross mass, continue stir more than 2h; Then aging 12h is left standstill, by γ-Al
2o
3make aluminium glue, then put into cordierite dipping 10h, take out the aluminium glue blowing away duct, 70 DEG C of oven dry, 600 DEG C of roasting 4h.Obtain γ-Al by analysis
2o
3specific area be 397.52m
2/ g, and can load preferably on cordierite.
Embodiment 3
The Al(NO good by proportioning
3)
3be dissolved in water, stir at the temperature of 90 DEG C, then dropwise drip ammoniacal liquor, add La(NO simultaneously
3)
3, in solution, ensure Al
3+: NH
3=1:3, Al(NO
3)
3concentration is 0.8g/ml, pH=9, La(NO
3)
3addition account for 4% of solution gross mass, continue stir more than 2h; Then aging 14h is left standstill, then by γ-Al
2o
3make aluminium glue, then put into cordierite dipping 9h, take out the aluminium glue blowing away duct, 80 DEG C of oven dry, 600 DEG C of roasting 4h.Obtain γ-Al by analysis
2o
3specific area be 398.14m
2/ g, and can load preferably on cordierite.
Above-mentioned embodiment is used for illustrative purposes only, and be not limitation of the present invention, the those of ordinary skill of relevant technical field, without departing from the spirit and scope of the present invention, can also make various change and modification, therefore all equivalent technical schemes also should belong to category of the present invention.
Claims (8)
1. the preparation method of catalyst carrier for purifying vehicle tail gas, it carries out according to the following steps:
(1) by Al(NO that proportioning is good
3)
3to be dissolved in water and to stir, then dripping ammoniacal liquor, add La(NO simultaneously
3)
3, continue to stir, then leave standstill aging, obtain γ-Al
2o
3, then make γ-Al
2o
3aluminium glue;
(2) cordierite is put into above-mentioned aluminium glue to flood;
(3) cordierite after dipping is taken out, and blow away the aluminium glue in duct;
(4) dry again, roasting.
2. method according to claim 1, is characterized in that: in step (1), ammoniacal liquor dropwises rear stirring, then adopts red fuming nitric acid (RFNA) residual titration to solution is clear, then continues to stir.
3. method according to claim 1, is characterized in that: Al(NO in step (1)
3)
3hydrolysis temperature is 70 DEG C--90 DEG C, and Al(NO
3)
3the concentration of solution is 0.6g/ml--0.8 g/ml.
4. method according to claim 1, is characterized in that: the mole dosage of ammoniacal liquor is Al
3+: NH
3=1:3, the pH=8--9 of solution.
5. method according to claim 1, is characterized in that: La(NO
3)
3the 2%--4% accounting for solution gross mass.
6. method according to claim 1, is characterized in that: ageing time is 10h-14h.
7. method according to claim 1, is characterized in that: bake out temperature is 60 DEG C--80 DEG C.
8. method according to claim 1, is characterized in that: sintering temperature is 600 DEG C, and roasting time is 4h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510072323.6A CN104689856A (en) | 2015-02-12 | 2015-02-12 | Method for preparing automobile tail gas purification catalyst carrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510072323.6A CN104689856A (en) | 2015-02-12 | 2015-02-12 | Method for preparing automobile tail gas purification catalyst carrier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104689856A true CN104689856A (en) | 2015-06-10 |
Family
ID=53337627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510072323.6A Pending CN104689856A (en) | 2015-02-12 | 2015-02-12 | Method for preparing automobile tail gas purification catalyst carrier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104689856A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1120752C (en) * | 2000-12-29 | 2003-09-10 | 中国科学院金属研究所 | Prepn of three-effect automobile tail gas purifying catalyst on foamed ceramic carrier |
| EP2407238A1 (en) * | 2009-03-09 | 2012-01-18 | Daiichi Kigenso Kagaku Kogyo Co., Ltd. | Exhaust gas purifying catalyst, exhaust gas purifying apparatus using same, and method for purifying exhaust gas |
-
2015
- 2015-02-12 CN CN201510072323.6A patent/CN104689856A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1120752C (en) * | 2000-12-29 | 2003-09-10 | 中国科学院金属研究所 | Prepn of three-effect automobile tail gas purifying catalyst on foamed ceramic carrier |
| EP2407238A1 (en) * | 2009-03-09 | 2012-01-18 | Daiichi Kigenso Kagaku Kogyo Co., Ltd. | Exhaust gas purifying catalyst, exhaust gas purifying apparatus using same, and method for purifying exhaust gas |
Non-Patent Citations (1)
| Title |
|---|
| 樊丁珲: ""稀土复合氧化物汽车尾气催化剂的制备与表征"", 《中国优秀博硕士论文全文数据库（硕士） 工程科技I辑》 * |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150610 |
|
| RJ01 | Rejection of invention patent application after publication |