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Mono-disperse noble metal-loaded single-layer hydrotalcite material as well as preparation method and application thereof

A noble metal, monodisperse technology, applied in chemical instruments and methods, preparation of imino compounds, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of expensive noble metals, difficult recycling, and limited noble metal homogeneous catalysts Application and other issues, to achieve the effect of simple preparation method, improved accessibility, improved conversion rate and selectivity

Active Publication Date: 2019-02-22
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Precious metals are expensive and difficult to recycle as homogeneous catalysts, which limits the further application of noble metal homogeneous catalysts

Method used

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  • Mono-disperse noble metal-loaded single-layer hydrotalcite material as well as preparation method and application thereof
  • Mono-disperse noble metal-loaded single-layer hydrotalcite material as well as preparation method and application thereof
  • Mono-disperse noble metal-loaded single-layer hydrotalcite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Take 6mmol Ni(NO 3 ) 2 ·6H 2 O, 2mmol Fe(NO 3 ) 3 ·9H 2 O and 180μmol RuCl 3 ·3H 2 O, make solution A in 200ml deionized water.

[0026] 2. Take 20ml formamide and add 180ml water to make solution C.

[0027] 3. Take 1g of NaOH and dissolve it in 100ml of water to prepare solution B.

[0028] 4. Drop solution A and solution B into solution C within 30 minutes, and control the pH at about 10.

[0029] 5. The reaction solution obtained in step 4 is filtered, and fully washed with deionized water until the pH value of the supernatant is less than 8, to obtain a monodisperse precious metal-supported monolayer hydrotalcite catalyst material.

[0030] Characterize the catalyst: by figure 1 It can be seen that the single-layer monodisperse precious metal hydrotalcite catalyst synthesized by this method has a particle size of about 20-30 nm and a thickness of about 1 nm, and the synthesized catalyst is a single layer. by figure 2 It can be seen that only the Ru-O coordination peak ...

Embodiment 2

[0033] 1. Take 10mmol Ni(NO 3 ) 2 ·6H 2 O, 5mmol Al(NO 3 ) 3 ·9H 2 O and 0.075mmol RuCl 3 ·3H 2 O, prepared solution A in 40ml deionized water.

[0034] 2. Take 10ml formamide and add 40ml water to make solution C.

[0035] 3. Take 1g of NaOH and dissolve it in 20ml of water to prepare solution B.

[0036] 4. Drop solution A and solution B into solution C within 20 minutes, and control the pH to around 9.

[0037] 5. The reaction solution obtained in step 4 is filtered, and fully washed with deionized water until the pH value of the supernatant is less than 8, to obtain a monodisperse precious metal-supported monolayer hydrotalcite catalyst material.

[0038] by figure 2 It can be seen that only the Ru-O coordination peak around 1.5 can be seen, but the Ru-Ru coordination peak around 2.7 is not seen, which confirms the monodisperse characteristics of Ru.

[0039] 150mg of the monodisperse noble metal-supported monolayer hydrotalcite material prepared above was used as a catalyst. It was...

Embodiment 3

[0041] 1.7.5mmol Mg(NO 3 ) 2 ·6H 2 O, 2.5mmol Al(NO 3 ) 3 ·9H 2 O and 0.3mmol RuCl 3 ·3H 2 O, make solution A in 200ml deionized water.

[0042] 2. Take 20ml formamide and add 180ml water to make solution C.

[0043] 3. Take 2g of NaOH and dissolve it in 100ml of water to prepare solution B.

[0044] 4. Drop solution A and solution B into solution C within ten minutes, and control the pH at about 10.

[0045] 5. The reaction solution obtained in step 4 is filtered, and fully washed with deionized water until the pH value of the supernatant is less than 8, to obtain a monodisperse precious metal-supported monolayer hydrotalcite catalyst material.

[0046] Characterize the catalyst: by figure 1 It can be seen that the single-layer monodisperse precious metal hydrotalcite catalyst synthesized by this method has a particle size of about 20-30 nm and a thickness of about 1 nm, and the synthesized catalyst is a single layer.

[0047] The invention adopts a one-step co-precipitation method to ...

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Abstract

The invention discloses a mono-disperse noble metal-loaded single-layer hydrotalcite material as well as a preparation method and application thereof. A series of mono-disperse noble metal-loaded single-layer hydrotalcite materials are synthesized through adjusting and controlling the types of hydrotalcite main body laminates and noble metal ions by virtue of a one-step coprecipitation method. Thematerial presents excellent catalytic activity in dehydrogenation coupling reaction. A catalyst prepared according to the invention is easy to operate, noble metals are in a mono-disperse state, andthe catalyst is low in use cost and can be easily produced and used in large scale.

Description

Technical field [0001] The invention belongs to the technical field of catalytic materials, and particularly relates to a monodisperse noble metal-supported monolayer hydrotalcite material, and a preparation method and application thereof. Background technique [0002] Homogeneous catalysts play an important role in the catalytic reaction. Among them, noble metal complex homogeneous catalysts have the advantages of high catalytic efficiency, good selectivity, wide application range, uniform catalysis, etc. Some noble metals such as rhodium, ruthenium, palladium and other elements have unique d-electron configurations, which can promote many chemical reactions. . Noble metal complex catalysts are widely used in fine chemical synthesis and biopharmaceutical industries, and can be used in hydrogenation reactions, carbonyl addition reactions, olefin oxidation reactions, C-C synthesis reactions, and dehydrogenation coupling reactions. [0003] Noble metals are expensive and difficult ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J23/58C07C249/02C07C251/24
CPCB01J23/007B01J23/58B01J23/892B01J23/8946C07C249/02C07C251/24
Inventor 宋宇飞王泽林赵宇飞
Owner BEIJING UNIV OF CHEM TECH
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