Aluminate intercalation hydrotalcite as well as preparation method and use thereof

A technology of hydrotalcite and aluminate, applied in the direction of hydrotalcite, chemical instruments and methods, aluminum compounds, etc., can solve the problems of inability to act, particle sintering, low surface area, etc., and achieve the effect of saving reagents and strong binding force

Active Publication Date: 2018-10-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, the industrial preparation of hydrotalcite theoretically produces 1 ton of hydrotalcite will consume 100 tons of water, which is a large amount of water, and a large part of the consumed water is consumed by using water to wash the remaining ions adsorbed on the surface of hydrotalcite
Second, the hydrotalcites currently used to prepare anions such as intercalated carbonates will decompose and release gases at high temperatures, making them pulverized du

Method used

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  • Aluminate intercalation hydrotalcite as well as preparation method and use thereof
  • Aluminate intercalation hydrotalcite as well as preparation method and use thereof
  • Aluminate intercalation hydrotalcite as well as preparation method and use thereof

Examples

Experimental program
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Example Embodiment

[0040] Example 1

[0041] Take Zn(NO 3 ) 2 ·6H 2 O 0.6mol is poured into A1 beaker and dissolved in 40ml deionized water, 1.2mol of sodium metaaluminate is poured into B1 beaker and 40ml deionized water is added to dissolve, another 20ml deionized water is poured into C1 beaker, A1, B1 two beakers The solution was sonicated for 10 min before use. Add a magnetic stirring bar to the C1 beaker, insert the pH meter into the reaction solution, adjust the reaction temperature of the oil bath to 70℃~100℃, adjust the rotation speed to 500 rpm, and then double drop the solution in the A1 and B1 beakers Add it to a C1 beaker, maintain the pH to 11-14 during the double-drop process, and under nitrogen protection during all the synthesis, and maintain this condition for 5-30 min. That is to obtain aluminate intercalated zinc-aluminum hydrotalcite.

[0042] After that, the following solid-liquid separation steps were performed: the reaction solution was put into a centrifuge tube and ...

Example Embodiment

[0045] Example 2

[0046] Take Mg (NO 3 ) 2 ·6H 2 O 0.6mol is poured into A2 beaker and 40ml deionized water is added to dissolve, 1.2mol of sodium metaaluminate is poured into B2 beaker and 40ml deionized water is added to dissolve, another 20ml deionized water is poured into C2 beaker, A2, B2 two beakers The solution was sonicated for 10 min before use. Add a magnetic stirrer to the C2 beaker, insert the pH meter into the reaction solution, adjust the reaction temperature of the oil bath to 70-100 °C, adjust the rotation speed to 500 rpm, and then add the solution in the A2 and B2 beakers in two drops. In a C2 beaker, the pH was maintained to 11-14 during the double-drop process, and there was nitrogen protection in all the processes of synthesis, and maintained under this condition for 5-30 min, to obtain aluminate intercalated magnesium-aluminum hydrotalcite.

[0047] Then proceed to the following solid-liquid separation steps: take the beaker out of the oil bath and l...

Example Embodiment

[0050] Example 3

[0051] For the above-mentioned zinc-aluminum hydrotalcite and magnesium-aluminum-aluminum hydrotalcite precursor materials prepared by double hydrolysis method and co-precipitation method respectively, after calcining at 500 ° C for 5 hours, the calcined product was subjected to XRD test, and the spectrum is as follows Figure 5 and Image 6 As shown, it can be seen that due to the intercalation of aluminate ions, the proportion of aluminum in zinc-aluminum hydrotalcite and magnesium-aluminum hydrotalcite is increased, so that calcination at a lower temperature (500 ° C) can obtain zinc-aluminum spinel and The crystal phase of magnesia-aluminum spinel. After taking pictures for comparison, see Figure 7 to Figure 10 . Grind it into powder and dissolve it in 1ml of absolute ethanol to drop copper mesh for transmission electron microscope test, see the results for details Figures 11 to 14 . It can be preliminarily obtained from the photos that the Zn-Al / ...

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Abstract

The invention discloses aluminate intercalation hydrotalcite, which has a molecular formula shown as [Ma(II)1-xMb(III)x(OH)2]<x+>(A<n->)x/n.mH2O, wherein Mb(III) is Al<3+>; Ma(II) represents positivebivalent metal cations on a main body layer plate; A<n-> is intercalation anions containing Al(OH)4<->; the value of x is 0.20 to 0.33 (i.e., Ma(II):Mb(III) is (2 to 4):1). The aluminate intercalationhydrotalcite provided by the invention has the advantages that the interlayer aluminate ions can participate in the composite oxide structure building after high-temperature roasting; the macroscopical appearance maintenance is realized. The invention also discloses a preparation method of the aluminate intercalation hydrotalcite, and a use of the aluminate intercalation hydrotalcite of being used as catalysis materials and 3D printing materials.

Description

technical field [0001] The invention belongs to the field of preparation and utilization of inorganic nanometer materials, and in particular relates to a hydrotalcite intercalated with aluminate, its preparation method and application. Background technique [0002] Hydrotalcite (Layer Double Hydroxides, LDHs for short) is a typical anionic layered material, and its derivatives, such as hydrotalcites and pillared hydrotalcites, are collectively referred to as layered double hydroxides. The structural formula of layered double hydroxide: [Ma(II) 1-x Mb(III) x (OH) 2 ] x+ (A n- ) x / n mH 2 O, Ma(II) represents positive divalent metal cations on the host laminate, such as Zn 2+ , Mg 2+ , Fe 2+ , Ca 2+ 、Co 2+ 、Ni 2+ etc.; Mb(III) represents positive trivalent metal cations on the host laminate, such as Al 3+ , Fe 3+ etc.; A n- is an interlayer anion with a valence of n, such as NO 3 - , Cl - 、PO 4 3- , CO 3 2- and SO 4 2- Wait. It is a kind of layered stru...

Claims

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Application Information

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IPC IPC(8): C01F7/00C01G9/00B33Y10/00B33Y70/00B01J21/10B01J23/06
CPCC01G9/00B01J21/10B01J23/005B01J23/04B01J23/06B33Y10/00B33Y70/00C01P2004/04C01P2002/72C01P2002/82C01P2006/12C01F7/785
Inventor 孙晓明袁子健
Owner BEIJING UNIV OF CHEM TECH
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