CN100447091C - Synthesis process of mesoporous ZrO2 molecular sieve - Google Patents
Synthesis process of mesoporous ZrO2 molecular sieve Download PDFInfo
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- CN100447091C CN100447091C CNB2004100645031A CN200410064503A CN100447091C CN 100447091 C CN100447091 C CN 100447091C CN B2004100645031 A CNB2004100645031 A CN B2004100645031A CN 200410064503 A CN200410064503 A CN 200410064503A CN 100447091 C CN100447091 C CN 100447091C
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Abstract
The present invention relates to a mesoporous zirconium dioxide molecular sieve and a synthesis method thereof, which belongs to the fields of inorganic material synthesis and catalyst science. The present invention is characterized in that a two-step crystallization method is adopted to synthesize mesoporous ZrO2 in an ethanol medium, wherein Zr(NO3)4.3H2O is used as a zirconium source, and cetyl trimethyl ammonium bromide (CTAB) is used as a template agent; the sample is calcined at a temperature of 450DEG C to obtain the product with BET surface area of 160m<2>/g. During the synthesis processes, the elements of yttrium, lanthanum, cerium, thorium, etc. can be added to obviously improve the thermal stability of the obtained sample and make the pore canals regular. The mesopores of the zirconium dioxide can be maintained after being roasted at a temperature of 650DEG C.
Description
One, technical field
The present invention is a kind of synthetic method of mesoporous ZrO 2 molecular sieve, belongs to inorganic synthetic and catalytic chemistry field.Specifically do the zirconium source, adopt the synthesising mesoporous ZrO of two step crystallization methods with zirconium nitrate
2A kind of method, elements such as adding yttrium, lanthanum, cerium, thorium improve mesoporous ZrO in synthetic
2Thermostability,
Two, background technology
Mesoporous zircite not only has the characteristics on the mesoporous material pore structure, (have acid and basic surface active centre but also have the premium properties of zirconium dioxide aspect catalysis concurrently, have oxidisability and reductibility), so such material not only provides possibility for processes such as some more macromolecular catalysis, absorption, separation, and for needing acid-base catalyzed reaction simultaneously, it has just shown unique advantages.Contain the zirconium mesoporous material except can directly doing the catalyzer use, also can be used as carrier loaded more active ingredient, make super acidic catalyst etc.So such material will have huge using value at petrochemical industry and field of fine chemical.
Forefathers do the zirconium source to synthetic most propyl alcohol zirconiums (or zirconium iso-propoxide) that adopt of mesoporous zircite, also there are indivedual authors to adopt zirconium oxychloride or zirconium sulfate to carry out, the price comparison height of propyl alcohol zirconium (or zirconium iso-propoxide), be unfavorable for reducing cost in the industrial production, and their deadly defect of institute's synthetic mesoporous zircite is a poor heat stability, specific surface area is low, and the high-temperature roasting pore structure can take place by subsiding to a certain degree
[1-15]
Three, summary of the invention
Its purpose of the synthetic method of mesoporous ZrO 2 of the present invention is to overcome the defective of above-mentioned prior art, thereby provide a kind of thermostability to significantly improve, the duct is more regular, greater than the synthetic method that still can keep the mesoporous ZrO 2 of its meso-hole structure after 650 ℃ of roastings.
The synthetic method of mesoporous ZrO 2 of the present invention is characterized in that adopting two step crystallization methods, with Zr (NO
3)
43H
2O does the zirconium source, and cetyl trimethylammonium bromide is a template, synthesising mesoporous ZrO in ethanol medium
2, concrete steps are: earlier with Zr (NO
3)
43H
2O and cetyl trimethylammonium bromide solid are dissolved in dehydrated alcohol respectively, ethanolic soln with both mixes stirring 0.5～2 hour then, be sealed in the stainless steel still of inner liner polytetrafluoroethylene, pre-crystallization was handled 1～10 hour under 70～150 ℃ of temperature, be cooled to room temperature, pour into and add alkali adjusting pH value to 3～11 in the beaker under the stirring, stir, be sealed in the stainless steel still of inner liner polytetrafluoroethylene once more, crystallization is 24～84 hours under 70～140 ℃ of temperature, and solid product can get mesoporous zircite through washing, drying, calcination process.
The synthetic method of above-mentioned mesoporous ZrO 2, it is characterized in that in building-up process, adding simultaneously the soluble salt of yttrium, lanthanum, cerium, thorium or other rare earth element or methyl ethyl diketone stablizer can improve the thermostability of synthesising mesoporous zirconium dioxide.
The synthetic method of above-mentioned mesoporous ZrO 2 is characterized in that described alkali is ammoniacal liquor or sodium hydroxide.
The synthetic method of above-mentioned mesoporous ZrO 2 is characterized in that cetyl trimethylammonium bromide and Zr (NO
3)
43H
2The mol ratio of O is 0.1～1.2.
The synthetic method of above-mentioned mesoporous ZrO 2 is characterized in that dissolving Zr (NO
3)
43H
2The dehydrated alcohol consumption of O is 40～50ml/5～8gZr (NO
3)
43H
2O.
The synthetic method of above-mentioned mesoporous ZrO 2, the dehydrated alcohol consumption that it is characterized in that dissolving cetyl trimethylammonium bromide is 10～15ml/2～3g cetyl trimethylammonium bromide.
The synthetic method of above-mentioned mesoporous ZrO 2 is characterized in that pre-crystallization temperature is 100～130 ℃, and crystallization time is 3～5h, and the scope of pH value is 3～11.
The synthetic method of above-mentioned mesoporous ZrO 2 is characterized in that crystallization temperature is 85～110 ℃, and crystallization time is 36～48h.
The synthetic method of above-mentioned mesoporous ZrO 2 is characterized in that the stablizer methyl ethyl diketone of described adding and the mol ratio of Zr are 0.1～2.8.
The synthetic method of above-mentioned mesoporous ZrO 2 is characterized in that stablizer yttrium, lanthanum, the cerium of described adding, the salt of thorium are nitrate or muriate, Y in the gained mesoporous material
2O
3, La
2O
3, Ce
2O
3Or ThO
2 Molar content 0～10%.
The present invention is verified by a large amount of experiments:
Pass through N
2The adsorption-desorption analysis as can be known, the adsorption-desorption thermoisopleth of sample is an IV type thermoisopleth in five kinds of thermoisopleth types of Blang's Nore (Brunauer) classification, belongs to typical mesoporous material.
By tem analysis as can be known, the gained mesoporous zircite is cellular, marshalling.It is cellular to add still presenting of sample behind the methyl ethyl diketone; After adding yttrium, lanthanum, cerium, four kinds of elements of thorium, the duct of sample is more regular, can be clearly seen that columniform straight-through duct.
Four, description of drawings
The mesoporous ZrO of Fig. 1
2The XRD graphic representation of sample;
The mesoporous ZrO of Fig. 2
2N
2The adsorption-desorption isothermal map;
The mesoporous ZrO of Fig. 3
2Pore distribution curve figure;
The mesoporous ZrO of Fig. 4
2The XRD graphic representation of sample under different maturing temperatures, among the figure: a-650 ℃ of roasting, b-550 ℃ of roasting, c-450 ℃ of roasting, d-is roasting not;
Fig. 5 sample (ZrO
2-La) the XRD graphic representation under different maturing temperatures, among the figure: a-650 ℃ of roasting, b-550 ℃ of roasting, c-450 ℃ of roasting, d-is roasting not;
The TEM figure of Fig. 6 sample is among the figure: A-ZrO
2, B-ZrO
2-Th.
Five, embodiment
Embodiment one
Get 5.9gZr (NO
3)
43H
2O is dissolved in the ethanol of 50ml, and other gets 2.0gCTAB and is dissolved in fully in the 15ml ethanol, both ethanolic solns is mixed stir 1h, pre-crystallization 4h in 110 ℃ of baking ovens packs in the reactor of 100ml, take out, stir, adding 28% ammoniacal liquor, to regulate the pH value be about 9, after stirring 2h, dress still crystallization 36h in the baking oven in 90 ℃, washing, drying, the XRD curve of gained sample after 450 ℃ of roastings seen accompanying drawing 1, N
2Adsorption-desorption thermoisopleth and pore distribution curve are seen accompanying drawing 2, and pore distribution concentration is about 1.68nm, and the BET surface-area is 160m
2/ g.The TEM picture of sample is seen the A of accompanying drawing 6 at this moment, and as can be seen, the duct of sample is arranged as cellular.The XRD curve of this sample before roasting and under the different maturing temperature seen accompanying drawing 3.
Embodiment two
Get 5.9gZr (NO
3)
43H
2O is dissolved in the ethanol of 50ml, other gets 2.6gCTAB and is dissolved in fully in the 15ml ethanol, both ethanolic solns are mixed stir 1h, in the reactor of the 100ml that packs in 110 ℃ of baking ovens pre-crystallization 4h, take out, stir, regulating the pH value with the NaOH aqueous solution of 8mol/L is about 9, behind the stirring 2h, and dress still crystallization 36h in 90 ℃ baking oven, washing, drying.The BET surface-area of sample is 110m after 450 ℃ of roastings
2/ g, pore distribution concentration is about 1.50nm.
Embodiment three
Get 5.9gZr (NO
3)
43H
2O is dissolved in the ethanol of 50ml, other gets 3.2gCTAB and is dissolved in fully in the 15ml ethanol, both ethanolic solns are mixed stir 1h, in the reactor of the 100ml that packs in 120 ℃ of baking ovens pre-crystallization 4h, take out, stir, it is about 9 that ammoniacal liquor with 28% is regulated the pH value, behind the stirring 2h, and dress still crystallization 36h in 90 ℃ baking oven, washing, drying.The BET surface-area of sample is 106m after 450 ℃ of roastings
2/ g, pore distribution concentration is about 1.47nm.
Embodiment four
Get 5.9gZr (NO
3)
43H
2O is dissolved in the ethanol of 50ml, other gets 1.5gCTAB and is dissolved in fully in the 15ml ethanol, both ethanolic solns are mixed stir 1h, in the reactor of the 100ml that packs in 80 ℃ of baking ovens pre-crystallization 4h, take out, stir, it is about 9 that ammoniacal liquor with 28% is regulated the pH value, behind the stirring 2h, and dress still crystallization 36h in 130 ℃ baking oven, washing, drying.The BET surface-area of sample is 119m after 450 ℃ of roastings
2/ g pore distribution concentration is about 1.48nm
Embodiment five
Get 5.9gZr (NO
3)
43H
2O is dissolved in the ethanol of 50ml, adds the methyl ethyl diketone of 0.6mL, is stirred to dissolving; Other gets 2.2gCTAB and is dissolved in fully in the 15ml ethanol, both ethanolic solns are mixed stir 1h, in the reactor of the 100ml that packs in 110 ℃ of baking ovens pre-crystallization 4h, take out, stir, adding ammoniacal liquor, to regulate pH value be about 9, stir 2h after, adorn still crystallization 36h in the baking oven in 90 ℃, washing, drying is carried out XRD analysis as can be known to the gained sample, and the gained sample belongs to mesoporous material.The BET surface-area of sample is 145m after 450 ℃ of roastings
2/ g, pore size distribution concentrates on about 1.92nm.The TEM picture of sample is seen the B of accompanying drawing 6 at this moment, and the duct of sample is arranged as cellular.
Embodiment six
Take by weighing 0.36gY (NO
3)
36H
2O adds in the ethanol of 50ml, adds 5.9gZr (NO again
3)
43H
2O is stirred to dissolving; Other gets 2.2gCTAB and is dissolved in fully in the 15ml ethanol, both ethanolic solns are mixed stirring 1h, the pre-crystallization 4h in 110 ℃ of baking ovens that packs in the reactor of 100ml takes out, and stirs, adding ammoniacal liquor adjusting pH value is about 9, after stirring 2h, dress still crystallization 36h in the baking oven in 90 ℃, washing, drying, the XRD curve after 450 ℃ of roastings of gained sample is seen the A of accompanying drawing 4.The N of sample after 350 ℃ of roastings
2The adsorption-desorption analysis as can be known, the BET surface-area is 214.15m
2/ g, pore distribution concentration is about 1.36nm.The BET surface-area of sample is 110m after 450 ℃ of roastings
2/ g, pore distribution concentration is about 1.56nm.The TEM picture of sample is seen the C of accompanying drawing 6 at this moment, and the duct of sample is arranged as regular cylindrical bore.The XRD curve of this sample before roasting and under the different maturing temperature seen the A of accompanying drawing 5.
Embodiment seven
Take by weighing 0.34gLa (NO
3)
3NH
2O adds in the ethanol of 50ml, adds 5.9gZr (NO again
3)
43H
2O is stirred to dissolving; Other gets 2.2gCTAB and is dissolved in fully in the 15ml ethanol, both ethanolic solns are mixed stir 1h, in the reactor of the 100ml that packs in 110 ℃ of baking ovens pre-crystallization 4h, take out, stir, adding ammoniacal liquor, to regulate pH value be about 9, stir 2h after, adorn still crystallization 36h in the baking oven in 90 ℃, washing, drying, the XRD curve after 450 ℃ of roastings of gained sample is seen the B of accompanying drawing 4, N
2The adsorption-desorption analysis as can be known, the BET surface-area is 224m
2/ g, pore distribution concentration is about 1.49nm.The TEM picture of sample is seen the D of accompanying drawing 6 at this moment, and the duct of sample is arranged as cellular.The XRD curve of this sample before roasting and under the different maturing temperature seen the B of accompanying drawing 5.
Embodiment eight
Take by weighing 0.40gCe (NO
3)
3NH
2O adds in the ethanol of 50ml, adds 5.9gZr (NO again
3)
43H
2O is stirred to dissolving; Other gets 2.2gCTAB and is dissolved in fully in the 15ml ethanol, both ethanolic solns are mixed stirring 1h, the pre-crystallization 4h in 110 ℃ of baking ovens that packs in the reactor of 100ml takes out, and stirs, adding ammoniacal liquor adjusting pH value is about 9, after stirring 2h, dress still crystallization 36h in the baking oven in 90 ℃, washing, drying, the XRD curve after 450 ℃ of roastings of gained sample is seen the C of accompanying drawing 4.The N of sample after 350 ℃ of roastings
2The adsorption-desorption analysis as can be known, pore distribution concentration is about 1.49nm, by calculating gained, the BET surface-area is 140m
2/ g.The TEM picture of sample is seen the E of accompanying drawing 6 at this moment, and the duct of sample is arranged as cellular.The XRD curve of this sample before roasting and under the different maturing temperature seen the C of accompanying drawing 5.
Embodiment nine
Take by weighing 0.26gTh (NO
3)
44H
2O adds in the ethanol of 50ml, adds 5.9gZr (NO again
3)
43H
2O is stirred to dissolving; Other gets 2.2gCTAB and is dissolved in fully in the 15ml ethanol, both ethanolic solns are mixed stirring 1h, the pre-crystallization 4h in 110 ℃ of baking ovens that packs in the reactor of 100ml takes out, and stirs, adding ammoniacal liquor adjusting pH value is about 9, after stirring 2h, dress still crystallization 36h in the baking oven in 90 ℃, washing, drying, the XRD curve after 450 ℃ of roastings of gained sample is seen the D of accompanying drawing 4.The N of sample after 350 ℃ of roastings
2The adsorption-desorption analysis as can be known, the BET surface-area is 194.14m
2/ g, pore distribution concentration is about 1.35nm.The BET surface-area of sample is 135m after 450 ℃ of roastings
2/ g, pore distribution is about 1.93nm.The TEM picture of sample is seen the F of accompanying drawing 6 at this moment, and the duct of sample is arranged as regular cylindrical bore.The XRD curve of this sample before roasting and under the different maturing temperature seen the D of accompanying drawing 5.
Claims (10)
1. the synthetic method of a mesoporous ZrO 2 is characterized in that adopting two step crystallization methods, with Zr (NO
3)
43H
2O does the zirconium source, and cetyl trimethylammonium bromide is a template, synthesising mesoporous ZrO in ethanol medium
2, concrete steps are: earlier with Zr (NO
3)
43H
2O and cetyl trimethylammonium bromide solid are dissolved in dehydrated alcohol respectively, ethanolic soln with both mixes stirring 0.5～2 hour then, be sealed in the stainless steel still of inner liner polytetrafluoroethylene, pre-crystallization was handled 1～10 hour under 70～150 ℃ of temperature, be cooled to room temperature, pour into and add alkali adjusting pH value to 3～11 in the beaker under the stirring, stir, be sealed in the stainless steel still of inner liner polytetrafluoroethylene once more, crystallization is 24～84 hours under 70～140 ℃ of temperature, and solid product can get mesoporous zircite through washing, drying, calcination process.
2. according to the synthetic method of the described mesoporous ZrO 2 of claim 1, it is characterized in that in building-up process, adding simultaneously the soluble salt of yttrium, lanthanum, cerium, thorium or other rare earth element or methyl ethyl diketone stablizer can improve the thermostability of synthesising mesoporous zirconium dioxide.
3. according to the synthetic method of the described mesoporous ZrO 2 of claim 1, it is characterized in that described alkali is ammoniacal liquor or sodium hydroxide.
4 synthetic methods according to the described mesoporous ZrO 2 of claim 1 is characterized in that cetyl trimethylammonium bromide and Zr (NO
3)
43H
2The mol ratio of O is 0.1～1.2.
5 synthetic methods according to the described mesoporous ZrO 2 of claim 1 is characterized in that dissolving Zr (NO
3)
43H
2The dehydrated alcohol consumption of O is 40～50ml/5～8gZr (NO
3)
43H
2O.
6 synthetic methods according to the described mesoporous ZrO 2 of claim 1, the dehydrated alcohol consumption that it is characterized in that dissolving cetyl trimethylammonium bromide is 10～15ml/2～3g cetyl trimethylammonium bromide.
7 synthetic methods according to the described mesoporous ZrO 2 of claim 1 is characterized in that pre-crystallization temperature is 100～130 ℃, and crystallization time is 3～5h, and the scope of pH value is 3～11.
8 synthetic methods according to the described mesoporous ZrO 2 of claim 1 is characterized in that crystallization temperature is 85～110 ℃, and crystallization time is 36～48h.
9 synthetic methods according to the described mesoporous ZrO 2 of claim 2 is characterized in that the stablizer methyl ethyl diketone of described adding and the mol ratio of Zr are 0.1～2.8.
10 synthetic methods according to the described mesoporous ZrO 2 of claim 2 is characterized in that stablizer yttrium, lanthanum, the cerium of described adding, the salt of thorium are nitrate or muriate, Y in the gained mesoporous material
2O
3, La
2O
3, Ce
2O
3Or ThO
2Molar content 0～10%.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101913650B (en) * | 2010-08-16 | 2011-10-26 | 河北工业大学 | Method for preparing ordered laminar nano/mesoporous structural zirconia polycrystalline powder |
| CN101913649B (en) * | 2010-08-16 | 2012-03-28 | 河北工业大学 | Method for preparing zirconium oxide polycrystalline powder with ordered laminar nanostructure/mesoporous structure by using surfactant as template |
| CN105344372B (en) * | 2015-11-09 | 2017-08-04 | 太原理工大学 | The preparation facilities and preparation method of a kind of mesoporous zirconium base molecular sieve catalyst |
| CN106268915A (en) * | 2016-07-15 | 2017-01-04 | 武汉市三合中天科技有限公司 | Minute amount of noble metal modification cerium zirconium meso-porous molecular sieve material and synthesis technique thereof and application |
| CN106622199B (en) * | 2017-01-25 | 2018-07-17 | 闽江学院 | A kind of porous ZrO of Large ratio surface2It is situated between and sees crystal |
| CN106542576B (en) * | 2017-01-25 | 2018-03-16 | 闽江学院 | A kind of zirconium dioxide, which is situated between, sees crystal and preparation method and application |
| CN109261118B (en) * | 2018-09-03 | 2022-02-08 | 扬州大学 | Preparation method of cerium and zirconium bimetal modified SBA-15 desulfurization adsorbent |
| CN116062791B (en) * | 2023-01-29 | 2023-12-19 | 宁波卿甬新材料科技有限公司 | Preparation method of mesoporous zirconia nano particles |
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|---|---|---|---|---|
| DE3430931A1 (en) * | 1983-08-24 | 1985-03-14 | Lion Corp., Tokio/Tokyo | SYNTHETIC, AMORPHOUS, ZIRCON-BONDED SILICATE AND METHOD FOR THE PRODUCTION THEREOF |
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