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A kind of non-stoichiometric zinc-aluminum spinel and its preparation method

A non-stoichiometric ratio, zinc-aluminum spinel technology, applied in chemical instruments and methods, inorganic chemistry, zinc compounds, etc., can solve the problem of limiting the performance and application of zinc-aluminum spinel, and the difficulty in obtaining pure zinc-aluminum spinel , Zinc-aluminum spinel grain size is large and other problems, to achieve the effect of adjustable zinc-aluminum molar ratio, low cost, high purity and crystallinity

Active Publication Date: 2021-08-31
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the zinc-aluminum molar ratio is much higher than the stoichiometric ratio, other oxides such as zinc oxide will appear, making it difficult to obtain zinc-aluminum spinel with higher purity
Secondly, the zinc-aluminum spinel synthesized by the above method either has a large grain size and a low specific surface area, or is prone to sintering under high temperature conditions, and has poor sintering resistance, which greatly limits the performance and performance of the zinc-aluminum spinel. application

Method used

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  • A kind of non-stoichiometric zinc-aluminum spinel and its preparation method
  • A kind of non-stoichiometric zinc-aluminum spinel and its preparation method
  • A kind of non-stoichiometric zinc-aluminum spinel and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 6.7423g Zn(NO 3 ) 2 ·6H 2 O and 8.5019g Al(NO 3 ) 3 9H 2 O and dissolved in 100 mL deionized water to prepare a zinc-aluminum mixed solution. Press Na 2 CO 3 The molar mass of Al(NO 3 ) 3 9H 2 Weigh 1.2011g of anhydrous Na with 0.5 times the molar amount of O 2 CO 3 , dissolved in 100 mL deionized water to prepare Na 2 CO 3 solution. Weigh 20g NaOH, dissolve it in 250mL deionized water, and prepare 2 mol / L NaOH solution. At room temperature and under magnetic stirring, the zinc-aluminum mixed solution was added dropwise to Na 2 CO 3 solution. At the same time, NaOH solution was added dropwise to Na 2 CO 3 solution, adjust the NaOH solution drop rate with a peristaltic pump to keep the pH of the solution = 10 ± 0.5. After the dropwise addition, it was left to age for 24 h, then suction filtered, and washed with deionized water until the pH of the filtrate = 7±0.2. Afterwards, the obtained solid was dried in an oven at 100 °C for 12 h to obtain ...

Embodiment 2

[0026] Weigh 8.3499g Zn(NO 3 ) 2 ·6H 2 O and 5.2646g Al(NO 3 ) 3 9H 2 O and dissolved in 100 mL deionized water to prepare a zinc-aluminum mixed solution. Press Na 2 CO 3 The molar mass of Al(NO 3 ) 3 9H 2 0.5 times the molar weight of O, weigh 0.7437g anhydrous Na 2 CO 3 , dissolved in 100 mL deionized water to prepare Na 2 CO 3 solution. Weigh 20g NaOH, dissolve it in 250mL deionized water, and prepare 2 mol / L NaOH solution. At room temperature and under magnetic stirring, the zinc-aluminum mixed solution was added dropwise to Na 2 CO 3 solution. At the same time, NaOH solution was added dropwise to Na 2 CO 3 solution, adjust the NaOH solution drop rate with a peristaltic pump to keep the pH of the solution = 10 ± 0.5. After the dropwise addition, it was left to age for 24 h, then suction filtered, and washed with deionized water until the pH of the filtrate = 7±0.2. Afterwards, the obtained solid was dried in an oven at 100 °C for 12 h to obtain zinc-al...

Embodiment 3

[0029] Weigh 9.0711g Zn(NO 3 ) 2 ·6H 2 O and 3.8128g Al(NO 3 ) 3 9H 2 O and dissolved in 100 mL deionized water to prepare a zinc-aluminum mixed solution. Press Na 2 CO 3 The molar mass of Al(NO 3 ) 3 9H 2 0.5 times the molar weight of O, weigh 0.5386g anhydrous Na 2 CO 3 , dissolved in 100 mL deionized water to prepare Na 2 CO 3 solution. Weigh 20g NaOH, dissolve it in 250mL deionized water, and prepare 2 mol / L NaOH solution. At room temperature and under magnetic stirring, the zinc-aluminum mixed solution was added dropwise to Na 2 CO 3 solution. At the same time, NaOH solution was added dropwise to Na 2 CO 3 solution, adjust the NaOH solution drop rate with a peristaltic pump to keep the pH of the solution = 10 ± 0.5. After the dropwise addition, it was left to age for 24 h, then suction filtered, and washed with deionized water until the pH of the filtrate = 7±0.2. Afterwards, the obtained solid was dried in an oven at 100 °C for 12 h to obtain zinc-al...

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Abstract

The invention discloses a non-stoichiometric zinc-aluminum spinel and a preparation method thereof. This method uses zinc-aluminum hydrotalcites as precursors, and first synthesizes zinc-aluminum hydrotalcites with a zinc-aluminum molar ratio of 1 to 3 by co-precipitation, and then heat-treats zinc-aluminum hydrotalcites at 800 ° C to obtain Single-phase non-stoichiometric zinc-aluminum spinel. The average grain size of the zinc-aluminum spinel is 10-15 nm, and the BET specific surface area can reach 138 m 2 / g, the zinc-aluminum molar ratio can reach 2.6. The preparation method of the present invention is simple, easy to operate, low in cost, high in yield, purity and crystallinity of spinel, small in grain size, high in specific surface area, adjustable in zinc-aluminum molar ratio, and good in high-temperature anti-sintering ability Features.

Description

technical field [0001] The invention belongs to the technical field of spinel preparation, and in particular relates to a non-stoichiometric zinc-aluminum spinel and a preparation method thereof. Background technique [0002] Zinc-aluminum spinel (ZnAl 2 o 4 ) is an AB 2 o 4 Type compound, with the characteristics of high Mohs hardness (8), high melting point (1950°C), good thermal stability, low thermal expansion coefficient, good thermal conductivity, high strength, strong acid and alkali resistance, etc., it is a high-quality refractory material and optical fiber Materials are widely used in chemistry, biology, metallurgy, medicine, military, aerospace and other fields. At the same time, zinc-aluminum spinel is also a very potential catalytic material. There are defects such as edges and corners with large surface energy and cation vacancies in its structure, and it has good thermal stability, so it is widely used as a catalyst or catalyst. carrier. Zinc-aluminum sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G9/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G9/00C01P2002/72C01P2004/04C01P2004/64C01P2006/12
Inventor 李达林潘金花宛春生江莉龙
Owner FUZHOU UNIV
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