Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of rh/coo nanometer catalyst and its preparation method, application

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

Active Publication Date: 2018-11-20
INST OF ADVANCED TECH UNIV OF SCI & TECH OF CHINA
View PDF4 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of rh/coo nanometer catalyst and its preparation method, application
  • A kind of rh/coo nanometer catalyst and its preparation method, application
  • A kind of rh/coo nanometer catalyst and its preparation method, application

Examples

Experimental program
Comparison scheme
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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a Rh / CoO nanocatalyst. Rh atoms are independently and uniformly supported on the surface of CoO flakes with a two-dimensional crystal structure. The invention also discloses a preparation method of the above-mentioned Rh / CoO nanocatalyst. CoO flakes with a two-dimensional crystal structure and deionized water are mixed to obtain mixed liquid A; sodium hexachlororhodate solution is added to mixed liquid A and mixed evenly to obtain a mixed liquid. Liquid B; stir mixed liquid B at room temperature, wash, and vacuum dry to obtain Rh / CoO nanocatalyst. The invention also discloses the application of the above-mentioned Rh / CoO nanocatalyst in propylene hydroformylation reaction. Through the high dispersion of single atoms and the strong interaction with the substrate, the present invention has high activity, high selectivity and high stability in the propylene hydroformylation reaction, and its heterogeneous structure makes the catalyst more beneficial Separate and collect it from the reaction system, thereby exerting its catalytic advantages in the propylene hydroformylation reaction.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
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