CN102258988A - Pretreatment method for pseudoboehmite with big specific surface area - Google Patents
Pretreatment method for pseudoboehmite with big specific surface area Download PDFInfo
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- CN102258988A CN102258988A CN2011101213247A CN201110121324A CN102258988A CN 102258988 A CN102258988 A CN 102258988A CN 2011101213247 A CN2011101213247 A CN 2011101213247A CN 201110121324 A CN201110121324 A CN 201110121324A CN 102258988 A CN102258988 A CN 102258988A
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- pseudoboehmite
- surface area
- specific surface
- pretreatment method
- big specific
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Abstract
The invention relates to a pretreatment method for pseudoboehmite with a big specific surface area. The pretreatment method is characterized by comprising the following steps of: placing the pseudoboehmite into a resistance furnace; slowly heating the pseudoboehmite for 25-35min to 95-105 DEG C; keeping warm for 25-35min; then continuously heating for 55-65 min to 375-425 DEG C; keeping warm for 1.5h; then continuously heating for 25-35min to 490-550 DEG C; keeping warm for 1.5h; and finally cooling the pseudoboehmite together with the resistance furnace to room temperature, and taking out a sample. The pretreatment method has the advantages that the pseudoboehmite has favorable gelatinizing property after the pseudoboehmite pretreated by the method is compounded wit other auxiliary agents, a coating does not crack, the stripping rate is low, and a catalyst coating with the big specific surface area and favorable property can be prepared.
Description
Technical field
The present invention relates to a kind of preprocess method of high specific surface area pseudo boehmite, especially a kind of high specific surface area pseudo boehmite that is used for three-way catalyst.
Technical background
In the preparation process of three-way catalyst, need to use alumine with high specific surface area, by aluminium oxide catalysis material and siderochrome aluminum substrate are bonded together, form the firm catalyst coat of one deck at matrix surface, to be used for the three-effect catalysis reaction.Traditional alumina material specific area is less, generally at 50～100m
2/ g, resistance to elevated temperatures is poor, and when temperature is higher (800 ℃), its specific area sharply descends, and the coating caking ability is bad, comes off easily.Boehmite is a kind of have high-specific surface area and good new material of resistance to elevated temperatures, generally at 200～300m
2/ g still keeps higher specific surface area, generally at 160～240m under 1000 ℃ high temperature
2/ g.The preparation of three-way catalyst coating, require the high-specific surface area material to become with the compound back of other auxiliary agents colloidality good and can with firm the bonding together of siderochrome aluminum substrate, can form stable coating.Yet, in the prior art boehmite with can not become glue after other auxiliary agents are compound, become cotton-shaped or jelly shape, influence the preparation of coating, and be easy to generate coating cracking, come off, can not be directly used in the coating of preparation three-way catalyst, seriously hinder the application of high temperature resistant high specific surface area pseudo boehmite in the three-way catalyst preparation.
Summary of the invention
Purpose of the present invention be exactly in the prior art boehmite with can not become glue after other auxiliary agents are compound, become cotton-shaped or jelly shape, influence the preparation of coating, and be easy to generate coating cracking, come off, can not be directly used in the coating of preparation three-way catalyst, seriously hindered the present situation of the application of high temperature resistant high specific surface area pseudo boehmite in the three-way catalyst preparation, and a kind of preprocess method of high specific surface area pseudo boehmite is provided.
A kind of preprocess method of high specific surface area pseudo boehmite, its preprocess method is: boehmite is put in the resistance furnace, slowly be heated to 95-105 ℃ with 25-35 minute, be incubated 25-35 minute, then continue slowly heating 55-65 minute to 375-425 ℃, be incubated 1.5 hours, continue heating 25-35 minute to 490-550 ℃ then, be incubated 1-1.5 hour, cool to normal temperature at last with the furnace, take out sample.
Advantage of the present invention is: through the pretreated boehmite of this method with become colloidality good after other auxiliary agents are compound, coating does not ftracture, expulsion rate is low, can prepare high-specific surface area and well behaved catalyst coat.Efficiently solve high temperature resistant high-ratio surface material boehmite and do not become the problem that glue, coating are easy to crack, come off, technology is simple, easy to operately, laborsaving save time, reliability is higher, cost is lower, can effectively improve the three-effect catalysis performance, therefore practicality is better, is easy to apply, and has big practical value.
The specific embodiment
Its preprocess method is: boehmite is put in the resistance furnace, be heated to 100 ℃ with 0.5 hour and be incubated 0.5 hour, then continue heating insulation in 1 hour to 400 ℃ 1.5 hours, continuation heating insulation in 0.5 hour to 500 ℃ is 1 hour then, cool to normal temperature at last with the furnace, take out sample.
Claims (1)
1. the preprocess method of a high specific surface area pseudo boehmite, it is characterized in that preprocess method is: boehmite is put in the resistance furnace, slowly be heated to 95-105 ℃ with 25-35 minute, be incubated 25-35 minute, then continue slowly heating 55-65 minute to 375-425 ℃, be incubated 1.5 hours, continue heating 25-35 minute to 490-550 ℃ then, be incubated 1-1.5 hour, cool to normal temperature at last with the furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101213247A CN102258988A (en) | 2011-05-12 | 2011-05-12 | Pretreatment method for pseudoboehmite with big specific surface area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101213247A CN102258988A (en) | 2011-05-12 | 2011-05-12 | Pretreatment method for pseudoboehmite with big specific surface area |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102258988A true CN102258988A (en) | 2011-11-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101213247A Pending CN102258988A (en) | 2011-05-12 | 2011-05-12 | Pretreatment method for pseudoboehmite with big specific surface area |
Country Status (1)
| Country | Link |
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| CN (1) | CN102258988A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1297786A (en) * | 1999-11-26 | 2001-06-06 | 汪忠清 | Preparation process and forming method of pseudo-thin diasphore with great pore volume |
| US6616902B1 (en) * | 1998-08-01 | 2003-09-09 | Comalco Aluminium Limited | Feed processing for improved alumina process performance |
| CN1752005A (en) * | 2005-10-25 | 2006-03-29 | 湘潭大学 | Preparation method of ultrafine active aluminium oxide |
-
2011
- 2011-05-12 CN CN2011101213247A patent/CN102258988A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6616902B1 (en) * | 1998-08-01 | 2003-09-09 | Comalco Aluminium Limited | Feed processing for improved alumina process performance |
| CN1297786A (en) * | 1999-11-26 | 2001-06-06 | 汪忠清 | Preparation process and forming method of pseudo-thin diasphore with great pore volume |
| CN1752005A (en) * | 2005-10-25 | 2006-03-29 | 湘潭大学 | Preparation method of ultrafine active aluminium oxide |
Non-Patent Citations (2)
| Title |
|---|
| 严加松等: "拟薄水铝石胶溶性能的研究", 《石油炼制与化工》 * |
| 朱小龙等: "煤气旋转沸腾烘干炉在拟薄水铝石生产中的应用", 《无机盐工业》 * |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20111130 |