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Rh/CoO nanometer catalyst, and preparation method and application thereof

A nano-catalyst and h-atom technology, which is applied in the preparation of carbon monoxide reaction, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of difficult separation, low stability, and detachment of homogeneous catalysts, and achieve excellent catalytic selectivity , high catalytic activity and catalytic stability

Active Publication Date: 2017-02-01
INST OF ADVANCED TECH UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, homogeneous catalysts are not easy to separate from the reaction system, which limits its application to a certain extent.
In contrast, rhodium-based heterogeneous catalysts have the advantage of being easy to separate and collect, but their catalytic selectivity is relatively low
Meanwhile, the lower stability due to the weaker physical adsorption of rhodium-based species on the substrate may cause leaching and detachment of substrate surface active species such as organic ligands and metal species

Method used

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  • Rh/CoO nanometer catalyst, and preparation method and application thereof
  • Rh/CoO nanometer catalyst, and preparation method and application thereof
  • Rh/CoO nanometer catalyst, and preparation method and application thereof

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Effect test

Embodiment 1

[0036] The preparation method of the above-mentioned Rh / CoO nano-catalyst that the present invention also proposes comprises the following steps: mixing CoO flakes with a two-dimensional crystal structure and deionized water to obtain a mixed solution A; adding sodium hexachlororhodium solution to the mixed solution A Mix evenly to obtain a mixed solution B; stir the mixed solution B at room temperature, wash, and vacuum dry to obtain a Rh / CoO nano-catalyst.

Embodiment 2

[0038] The preparation method of the above-mentioned Rh / CoO nano-catalyst proposed by the present invention includes the following steps: mixing CoO flakes with a two-dimensional crystal structure and deionized water to obtain a mixed solution A, CoO flakes with a two-dimensional crystal structure and deionized water The mass-to-volume ratio (mg / mL) of the mixture is 102:9; the sodium hexachlororhodium solution with a concentration of 5.5 mg / mL is added to the mixed solution A and mixed evenly to obtain the mixed solution B, the sodium hexachlororhodium solution and deionized water The volume ratio is 0.22:9; the mixed solution B was magnetically stirred at room temperature for 3.5 hours, washed, and dried in vacuum to obtain the Rh / CoO nano-catalyst.

[0039] The preparation method of CoO flakes with a two-dimensional crystal structure is as follows: mix cobalt acetylacetonate, ethylene glycol, and deionized water at room temperature, carry out hydrothermal reaction after stir...

Embodiment 3

[0041] The preparation method of the above-mentioned Rh / CoO nano-catalyst proposed by the present invention includes the following steps: mixing CoO flakes with a two-dimensional crystal structure and deionized water to obtain a mixed solution A, CoO flakes with a two-dimensional crystal structure and deionized water The mass-to-volume ratio (mg / mL) is 95:12; In mixed solution A, add the sodium hexachlororhodium solution that concentration is 5mg / mL and mix uniformly to obtain mixed solution B, the sodium hexachlororhodium solution and deionized water The volume ratio is 0.25:8; the mixture B is stirred at room temperature for 5 hours, and the stirred material is centrifuged at a centrifugal speed of 11,000 rpm for 5 minutes, and the centrifuged product is ultrasonically washed with a polar solvent for 1 minute. Then repeat the above steps of centrifugal separation and washing, and vacuum dry at 52° C. to obtain the Rh / CoO nano-catalyst.

[0042]The preparation method of CoO f...

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Abstract

The invention discloses a Rh / CoO nanometer catalyst. Rh atoms are independently and uniformly loaded on the surface of a CoO flake with a two-dimensional crystal structure. The invention also discloses a preparation method for the Rh / CoO nanometer catalyst. The preparation method comprises the following steps: mixing the CoO flake with the two-dimensional crystal structure with deionized water so as to obtain a mixed solution A; adding a sodium hexachlororhodate solution into the mixed solution A and carrying out uniform mixing so as to obtain a mixed solution B; and subjecting the mixed solution B to stirring and cleaning at room temperature and to vacuum drying so as to obtain the Rh / CoO nanometer catalyst. The invention also discloses application of the Rh / CoO nanometer catalyst to hydroformylation of propylene. According to the invention, through high dispersity of single atoms and strong interaction between substrates, the Rh / CoO nanometer catalyst has high activity, high selectivity and high stability in hydroformylation of propylene, and the heterogeneous structure of the catalyst facilitates separation and collection of the catalyst from a reaction system; so the catalytic advantages of the catalyst in hydroformylation of propylene are given to full play.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a Rh / CoO nanometer catalyst and its preparation method and application. Background technique [0002] Olefin hydroformylation is an extremely important chemical reaction. The aldehyde products obtained from the reaction can be used as intermediates and are widely used in the synthesis of fine chemicals such as esters, alcohols, carboxylic acids, and aliphatic amines. Traditional olefin hydroformylation mainly uses rhodium-based homogeneous catalysts as catalysts, and has good activity and selectivity. However, homogeneous catalysts are not easy to separate from the reaction system, which limits its application to some extent. In contrast, rhodium-based heterogeneous catalysts have the advantage of easy separation and collection, but their catalytic selectivity is relatively low. Meanwhile, the lower stability due to the weaker physical adsorption of rhodium-based species on t...

Claims

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Application Information

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IPC IPC(8): B01J23/89C07C45/50C07C47/21
CPCC07C45/50B01J23/8913B01J35/399C07C47/21
Inventor 王梁炳张文博王梦琳李洪良曾杰
Owner INST OF ADVANCED TECH UNIV OF SCI & TECH OF CHINA
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