Rhodium nanometer catalyst as well as preparation method and application thereof

A nano-catalyst and nano-flower technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, hydrogenation hydrocarbon production, etc., can solve problems such as the difficulty of adsorbing species, reducing the effective active sites on the surface, etc., and achieve less catalyst consumption, Superior catalytic activity, fine particle effect

Active Publication Date: 2015-04-29
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These organic solvents and surfactant molecules are inevitably adsorbed on the surface of rhodium nanoparticles, thereby greatly reducing the effective active sites on the surface, and while maintaining the original particle size and structural characteristics, remove the "unhealthy" particles on the surface of these rhodium catalysts. "clean" adsorbed species is very difficult

Method used

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  • Rhodium nanometer catalyst as well as preparation method and application thereof
  • Rhodium nanometer catalyst as well as preparation method and application thereof
  • Rhodium nanometer catalyst as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Weigh 0.025 mmol of rhodium acetylacetonate and place it in a polytetrafluoroethylene reactor, add 8 mL of deionized water, add 10 mmol of formaldehyde solution to the suspension, and stir magnetically for 20 min. Sealed and heated to 180°C, kept at constant temperature for 7 hours, then cooled naturally to room temperature. The product was centrifuged from solution and dried in air. The obtained rhodium catalyst powder has a flower-like multi-level structure composed of nano-sheets, the flower shape is about 350 nm, and the thickness of the flower flakes is about 1.1 nm. Its phase analysis is pure rhodium, which belongs to the face-centered cubic structure, and X-ray powder diffraction XRD is as follows: figure 1 As shown, its morphology analysis SEM is as follows figure 2 shown.

Embodiment 2

[0027] Weigh 0.025 mmol of rhodium acetylacetonate and place it in a polytetrafluoroethylene reactor, add 7 mL of deionized water, add 20 mmol of formaldehyde solution to the suspension, and stir magnetically for 20 min. Sealed and heated to 180°C, kept at constant temperature for 14 hours, then cooled naturally to room temperature. The product was centrifuged from solution and dried in air. The rhodium catalyst powder was obtained, the morphology was similar to that of Example 1, and the particle size of the nanoflowers was about 400nm. Its phase analysis result is identical with embodiment 1.

Embodiment 3

[0029] Weigh 0.025 mmol of rhodium acetylacetonate and place it in a polytetrafluoroethylene reactor, add 8 mL of deionized water, add 5 mmol of formaldehyde solution to the suspension, and stir magnetically for 20 min. Sealed and heated to 160°C, kept at constant temperature for 7 hours and then cooled to room temperature naturally. The product is centrifugally separated from the solution and dried in the air to obtain a rhodium catalyst powder. The morphology remains as a flower-like multi-level structure composed of nanosheets. The nanoflower particles are slightly smaller than in Example 1, and some nanosheets have small particles. Adhesion. Its phase analysis result is identical with embodiment 1.

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Abstract

The invention relates to a rhodium nanometer catalyst as well as a preparation method and application thereof. The rhodium nanometer catalyst is a 100% rhodium nano-particle and a nanometer flower-like multi-level structure, wherein the thickness of the flower is 1.1nm. The preparation method comprises the following steps of placing a rhodium precursor, namely, rhodium acetylacetonate or rhodium trichloride into a reactor, adding deionized water, carrying out ultrasonic dispersion, adding a formaldehyde solution and reacting to obtain the rhodium nanometer catalyst. The rhodium nanometer catalyst can be applied in the hydrogenation reaction of cyclohexene. The preparation method is a one-step method and is simple in operation process and mild in reaction conditions. The solvent is environmentally friendly and has no environmental pollution. The subsequent processes such as crushing and ball milling are not needed and the rhodium nanometer catalyst can be directly used. During the use, the rhodium nanometer catalyst is hardly agglomerated and the active area loss of the catalyst is reduced. The rhodium nanometer catalyst has superior catalytic activity to the hydrogenation of cyclohexene, the usage amount of the catalyst is small, the reaction temperature is low and the reaction time is short.

Description

technical field [0001] The invention relates to a rhodium nanometer catalyst, in particular to a rhodium nanometer catalyst and its preparation method and application. Background technique [0002] Due to its unique properties, rhodium nanomaterials are widely used in the field of industrial catalysis, especially in petroleum refining, fine chemical synthesis, and automobile exhaust gas purification, such as the catalytic hydrogenation of aromatic hydrocarbons by rhodium nanocatalysts And carbon monoxide oxidation reaction (Yuan Yuan, Ning Yan, and Paul J.Dyson.ACS Catal.2012,2,1057-1069) showed superior performance. However, the scarce storage capacity and high price greatly limit the application of rhodium catalysts, and it is necessary to synthesize rhodium nanocatalysts with high catalytic activity. The traditional method of improving the catalytic activity of catalysts is to increase the specific surface area by reducing the size of catalyst particles, thereby increasi...

Claims

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Application Information

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IPC IPC(8): B01J23/46C07C13/18C07C5/03
Inventor 蒋亚琪苏静韵谢兆雄
Owner XIAMEN UNIV
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