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Zinc-aluminium hydrotalcite rich in cuprous ions and preparation method and application of zinc-aluminium hydrotalcite

A zinc-aluminum hydrotalcite and cuprous ion technology, applied in the preparation/separation of ammonia, chemical instruments and methods, zinc compounds, etc., can solve the problems of poor stability, easy disproportionation reaction, application limitations, etc., to improve stability , Ease of large-scale production, and low synthesis cost

Active Publication Date: 2019-10-25
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to their special electronic structure, low-valence transition metal ions have potential for catalytic applications, but their stability is poor, and disproportionation reactions easily occur to generate high-valence metal ions and metal elements, which greatly limits their application.

Method used

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  • Zinc-aluminium hydrotalcite rich in cuprous ions and preparation method and application of zinc-aluminium hydrotalcite
  • Zinc-aluminium hydrotalcite rich in cuprous ions and preparation method and application of zinc-aluminium hydrotalcite
  • Zinc-aluminium hydrotalcite rich in cuprous ions and preparation method and application of zinc-aluminium hydrotalcite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Preparation of Zinc-Al Hydrotalcite 0.5%-ZnAl-LDH Rich in Cuprous Ions

[0046] 1) Prepare mixed metal precursor solution: dissolve 0.1mmol copper nitrate trihydrate, 10mmol zinc nitrate hexahydrate and 10mmol aluminum nitrate nonahydrate in 15ml deionized water;

[0047] 2) Prepare alkali precursor solution: dissolve 60mmol sodium hydroxide and 17.358mmol sodium carbonate in 15ml deionized water;

[0048] 3) Add the prepared metal precursor solution and alkali precursor solution dropwise to 15ml deionized water at the same time, and mix well to obtain a suspension;

[0049] 4) The suspension obtained in step 3) was placed on a constant temperature oil bath stirrer, and crystallized at 60° C. for 16 hours to obtain the product;

[0050] 5) Wash the product obtained in step 4) with deionized water for 10 times, dry at 60°C for 12 hours, and grind to obtain hydrotalcite nanosheets, which are zinc-aluminum hydrotalcites rich in cuprous ions, named as 0.5%- ZnAl-LDH.

[...

Embodiment 2-4

[0067] The preparation process of zinc-aluminum hydrotalcite rich in cuprous ions in Examples 2-4 is basically the same as that of Example 1, except that the amount of copper salt is changed, as shown in Table 1. The prepared hydrotalcites are respectively Named [0.25%-ZnAl-LDH, 1%-ZnAl-LDH, 3%-ZnAl-LDH], the XRD pattern of hydrotalcite is as follows figure 1 shown. The prepared zinc-aluminum hydrotalcite rich in cuprous ions is used for photocatalytic nitrogen adding water to prepare ammonia, the steps are the same as in Example 1, and the results obtained are shown in Table 1, also as Figure 4 shown.

[0068] Table 1 Photocatalytic ammonia production rate of zinc-aluminum hydrotalcites rich in different cuprous ion contents

[0069]

[0070] Combined with the ammonia production rate of the hydrotalcite prepared in Example 1, Comparative Example 1-2 and Example 2-4 for photocatalytic ammonia synthesis, it can be found that the rate of ammonia production is related to th...

Embodiment 5-9

[0072] The preparation process of the zinc-aluminum hydrotalcite rich in cuprous ions in Examples 5-9 is basically the same as in Example 1, except that the crystallization temperature is changed, as shown in Table 2. The prepared zinc-aluminum hydrotalcite rich in cuprous ions was used to photocatalyze the addition of water to nitrogen to prepare ammonia. The procedure was the same as in Example 1, and the results obtained are shown in Table 2.

[0073] Table 2 Photocatalytic ammonia production rate of cuprous ion-rich zinc-aluminum hydrotalcite prepared at different crystallization temperatures

[0074]

[0075] It can be seen from Table 2 that under full-spectrum irradiation for 1 hour, the rate of photocatalytic synthesis of ammonia is closely related to the crystallization temperature of the precursor. In a certain crystallization temperature range, the prepared copper-rich zinc-aluminum hydrotalcite can catalyze a higher rate of ammonia production. When the crystalli...

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Abstract

The invention provides a zinc-aluminium hydrotalcite rich in cuprous ions. The content of the cuprous ions is 0.14%-1.5%. Unit cells of the zinc-aluminum hydrotalcite provide ideal carriers for the high-activity cuprous ions, the stability of the cuprous ions in materials is improved, and the laminated coordination of the zinc-aluminum hydrotalcite can provide foundation for the realization of cuprous ion catalysis. For the first time, the zinc-aluminium hydrotalcite rich in the cuprous ions is applied to prepare ammonia by photocatalytic nitrogen and water adding, and the rate of synthesis ammonia is much higher than that of a conventional catalyst. In addition, the zinc-aluminium hydrotalcite rich in the cuprous ions is low in synthesis cost and simple in operation, mass production is facilitated, yield of the synthetic ammonia is high, and potential for large-scale application is achieved.

Description

technical field [0001] The invention relates to the technical field of new materials. More specifically, it relates to a zinc-aluminum hydrotalcite rich in cuprous ions and its preparation method and application. Background technique [0002] Ammonia (NH3) is one of the important inorganic chemical products and plays a key role in industrial chemical synthesis. The world's annual industrial synthetic ammonia output has reached more than 200 million tons, of which about 80% of industrial synthetic ammonia is used to synthesize chemical fertilizers, and nitrogen fertilizers (such as urea, ammonium nitrate, etc.) used in agriculture are all prepared from ammonia. In addition, ammonia molecules have high energy density and high hydrogen content, and can be compressed into liquid fuels, which are very convenient for storage and transportation. At the same time, nitrogenase in nature can "fix" nitrogen in the air to synthesize ammonia, which is supplied to organisms on the earth...

Claims

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Application Information

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IPC IPC(8): C01G9/00C01C1/02B01J27/232
CPCC01G9/006C01C1/026B01J27/232C01P2002/22B01J35/39Y02P20/52Y02P20/133
Inventor 张铁锐张帅赵运宣施润周超
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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