A kind of single-layer hydrotalcite material supported by monodisperse noble metal and its preparation method and application

A precious metal, monodisperse technology, applied in chemical instruments and methods, preparation of imino compounds, metal/metal oxide/metal hydroxide catalysts, etc. Utilize and other problems to achieve the effect of simple preparation method, improved accessibility, improved conversion rate and selectivity

Active Publication Date: 2020-10-02
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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  • A kind of single-layer hydrotalcite material supported by monodisperse noble metal and its preparation method and application
  • A kind of single-layer hydrotalcite material supported by monodisperse noble metal and its preparation method and application
  • A kind of single-layer hydrotalcite material supported by monodisperse noble metal and its preparation method and application

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 180 μmol RuCl 3 ·3H 2 O, prepared as 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, dissolve it in 100ml of water, and make 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. Filter the reaction solution obtained in step 4, and fully wash it with deionized water until the pH value of the supernatant is less than 8, thus obtaining a monodisperse noble metal-supported monolayer hydrotalcite catalyst material.

[0030] To characterize the catalyst: by figure 1 It can be seen that the monolayer monodisperse noble 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. Depend on figure 2 It can be seen that only th...

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 as 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, dissolve it in 20ml of water, and make solution B.

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

[0037] 5. Filter the reaction solution obtained in step 4, and fully wash it with deionized water until the pH value of the supernatant is less than 8, thus obtaining a monodisperse noble metal-supported monolayer hydrotalcite catalyst material.

[0038] Depend on figure 2 It can be seen that only the Ru-O coordination peak around 1.5 can be seen, but no Ru-Ru coordination peak around 2.7 can be seen, which confirms the monodisperse characteristics of Ru.

[0039] 150 mg of monodisperse noble metal-supported single-layer hydrotalcite material prepared above was used...

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, prepared as solution A in 200ml deionized water.

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

[0043] 3. Take 2g NaOH, dissolve it in 100ml water, and make solution B.

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

[0045] 5. Filter the reaction solution obtained in step 4, and fully wash it with deionized water until the pH value of the supernatant is less than 8, thus obtaining a monodisperse noble metal-supported monolayer hydrotalcite catalyst material.

[0046] To characterize the catalyst: by figure 1 It can be seen that the monolayer monodisperse noble 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 m...

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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 in particular relates to a single-layer hydrotalcite material loaded with monodisperse precious metals and its preparation method and application. Background technique [0002] Homogeneous catalysts play an important role in catalytic reactions. Among them, the noble metal complex homogeneous catalyst has the advantages of high catalytic efficiency, good selectivity, wide application range, and uniform catalysis. Some noble metals such as rhodium, ruthenium, palladium and other elements can promote many chemical reactions due to their unique d electron configuration. . 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 di...

Claims

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Application Information

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Patent Type & Authority Patents(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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