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Vegetable-sponge-shaped hydrotalcite-like compound and preparation method thereof

A technology of hydrotalcite and loofah pulp, which is applied in the direction of cobalt oxide/cobalt hydroxide, aluminum oxide/aluminum hydroxide, zinc oxide/zinc hydroxide, etc., which can solve the problem of no report of loofah-shaped hydrotalcite, unsuitable for industrial production, and post-production problems. Solve problems such as long process to achieve the effect of unique and uniform shape, low cost and easy control

Inactive Publication Date: 2013-09-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method needs to remove the template in the later stage, and the post-treatment process is long and complicated, which is limited to experimental research and is not suitable for industrial production
[0006] At present, there is no report on loofah-like hydrotalcites with large specific surface area.

Method used

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  • Vegetable-sponge-shaped hydrotalcite-like compound and preparation method thereof
  • Vegetable-sponge-shaped hydrotalcite-like compound and preparation method thereof
  • Vegetable-sponge-shaped hydrotalcite-like compound and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Step A: 100g Al(NO 3 ) 3 9H 2 O, 40g of urea was mixed in 280mL of deionized water, stirred evenly, and subjected to hydrothermal reaction at 120°C for 24h, the product was washed, filtered, and dried at 80°C to obtain the molecular formula NH 4 [Al(OOH)HCO 3 ] the rod-shaped basic ammonium aluminum carbonate cluster precursor (such as figure 1 shown).

[0025] Step B: Take 5g of basic ammonium aluminum carbonate precursor and disperse it in 250mL of deionized water, slowly add Na 2 CO 3 solution (0.95g dissolved in 100mL deionized water) and Mg(NO 3 ) 2 Solution (4.5g dissolved in 100mL deionized water), heated to 80°C for 10h, the obtained product was washed, filtered, and dried at 70°C to obtain loofah-like Mg / Al-LDHs. The measured BET specific surface area is 90m 2 / g, the average pore diameter is 21.9nm.

Embodiment 2

[0027] Step A: Same as step A in Example 1.

[0028] Step B: Take 5g of basic ammonium aluminum carbonate precursor and disperse it in 250mL of deionized water, slowly add Na 2 CO 3 solution (0.95g dissolved in 100mL deionized water) and Mg(NO 3 ) 2 Solution (4.5g dissolved in 100mL deionized water), heated to 90°C for 9h, the obtained product was washed, filtered, and dried at 70°C to obtain loofah-like Mg / Al-LDHs. The measured BET specific surface area is 94m 2 / g, and the average pore diameter is 21.1nm.

Embodiment 3

[0030] Step A: Same as step A in Example 1.

[0031] Step B: Take 5g of basic ammonium aluminum carbonate precursor and disperse it in 250mL of deionized water, slowly add Na 2 CO 3 solution (3.8g dissolved in 100mL deionized water) and Mg(NO 3 ) 2 Solution (18g Mg(NO 3 ) 2 ·6H 2 O dissolved in 100 mL deionized water), heated to 90 °C for 9 h, the obtained product was washed, filtered, and dried at 70 °C to obtain loofah-like Mg / Al-LDHs. The measured BET specific surface area is 98m 2 / g, the average pore diameter is 21.0nm.

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Abstract

The invention relates to a vegetable-sponge-shaped hydrotalcite-like compound and a preparation method thereof, belonging to the field of preparation of inorganic function materials. The preparation method comprises the following steps of: firstly, reacting aluminum salt with urea to produce an ammonium aluminum carbonate hydroxide precursor, and then, reacting the ammonium aluminum carbonate hydroxide precursor with sodium carbonate and divalent metal salt solution to obtain the vegetable-sponge-shaped hydrotalcite-like compound. The hydrotalcite-like compound is vegetable-sponge-shaped in microstructure, is rich in nano holes and special and uniform in morphology, and has bigger specific surface area, wherein the BET specific surface area is 80-120m<2> / g, so that the vegetable-sponge-shaped hydrotalcite-like compound is an ideal catalyst precursor material and an absorption and ion exchange material under special conditions.

Description

Technical field: [0001] The invention relates to a loofah-like hydrotalcite and a preparation method thereof, belonging to the field of preparation of inorganic functional materials. Background technique: [0002] Hydrotalcite-like compounds (HTLs for short), also known as composite metal hydroxides (Layered Double Hydroxides, LDHs for short), are composed of positively charged host laminates ([M Ⅱ 1－x m Ⅲ x (OH) 2 ] x+ ) and the interlayer hydrated anion guest ((A n ) x / n ·yH 2 O) is a general term for a class of anionic compounds with a supramolecular structure, and its chemical composition can be expressed as [M Ⅱ 1－x m Ⅲ x (OH) 2 ] x+ (A n- ) x / n ·yH 2 O, usually abbreviated as M Ⅱ m Ⅲ -A-LDHs, where M Ⅱ and M Ⅲ represent divalent and trivalent metal ions, respectively, A n- Represents interlayer anions. The host layer tunability and interlayer guest anion exchangeability are the main features of hydrotalcite-like compounds. By adjusting the type a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01G51/04C01G9/02
Inventor 吕志侯丽娜宋家庆徐向宇
Owner BEIJING UNIV OF CHEM TECH
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