Superfine ruthenium nano-catalyst and method for preparing superfine ruthenium nano-catalyst in situ

A nano-catalyst and in-situ preparation technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of nanoparticle agglomeration and low dispersion, and achieve high catalytic activity and dispersion Good, the effect of improving efficiency

Inactive Publication Date: 2020-11-06
INST OF PETROCHEM HEILONGJIANG ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of nanoparticle agglomeration and low dispersion in existing ruthenium catalysts prepared by chemical reduction, the invention provides an ultrafine ruthenium nanocatalyst and a method for preparing ultrafine ruthenium nanocatalysts in situ

Method used

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  • Superfine ruthenium nano-catalyst and method for preparing superfine ruthenium nano-catalyst in situ
  • Superfine ruthenium nano-catalyst and method for preparing superfine ruthenium nano-catalyst in situ
  • Superfine ruthenium nano-catalyst and method for preparing superfine ruthenium nano-catalyst in situ

Examples

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Embodiment 1

[0025] This example provides a method for preparing ultrafine ruthenium nanocatalysts in situ. Take 0.283g of hydrotalcite and put it into a beaker, add 6mL of deionized water, and add 14mL of 0.01mol / L RuCl dropwise. 3 Solution, ultrasonically disperse for 2min under 400W ultrasonic power, stir and impregnate at room temperature for 12h, centrifuge to collect the precipitate and place it in a 60°C oven to dry for 6h. After pumping air to make the absolute pressure reach 80Pa, apply high voltage, adjust the discharge current to 2.5A, discharge once for 10 minutes, and repeat the discharge 4 times to prepare a hydrotalcite-supported ultrafine ruthenium nanocatalyst with a loading capacity of 5wt.%. It is marked as Ru / HT-P, and the particle size of the ruthenium nanoparticles loaded therein is 1.41-2.62nm.

Embodiment 2

[0027] This embodiment provides a method for in-situ preparation of ultrafine ruthenium nanocatalysts. Put 0.283g of hydrotalcite into a beaker, add 6mL of deionized water, and add 14mL of 0.01mol / L Ru(OAc) dropwise. 3 Solution, ultrasonically disperse for 2min under 400W ultrasonic power, stir and impregnate at room temperature for 12h, centrifuge to collect the precipitate and place it in a 60°C oven to dry for 6h. After pumping air to make the absolute pressure reach 60Pa, apply high voltage, adjust the discharge current to be 2.0A, discharge once for 5 minutes, and discharge repeatedly for 10 times to prepare a hydrotalcite-supported ultrafine ruthenium nanocatalyst with a loading capacity of 5wt.%. The particle diameter of the ruthenium nanoparticles loaded therein is 1.41-2.62nm.

Embodiment 3

[0029] The present embodiment provides a method for in-situ preparation of ultra-fine ruthenium nanocatalysts. Put 0.283g of hydrotalcite into a beaker, add 6mL of deionized water, and add 14mL of 0.01mol / L Ru(NO)(NO) dropwise. 3 ) 3 Solution, ultrasonically disperse for 2min under 400W ultrasonic power, stir and impregnate at room temperature for 12h, centrifuge to collect the precipitate and place it in a 60°C oven to dry for 6h. After degassing, pump air to make the absolute pressure reach 60Pa, apply high voltage, adjust the discharge current to 2.0A, discharge once for 20 minutes, and repeat the discharge 6 times to prepare a hydrotalcite-supported ultrafine ruthenium nanocatalyst with a loading capacity of 5wt.%. Among them, the particle diameter of the ruthenium nanoparticles loaded therein is 1.41-2.62nm.

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Abstract

The invention relates to a superfine ruthenium nano-catalyst and a method for preparing the superfine ruthenium nano-catalyst in situ, and belongs to the technical field of nano-catalysts. In order tosolve the problems of nanoparticle aggregation and low dispersity of ruthenium catalysts prepared by chemical reduction in the prior art, the invention provides a superfine ruthenium nano-catalyst, and the loading capacity of superfine ruthenium nanoparticles loaded by hydrotalcite as a carrier is 5wt.%. The in-situ preparation method comprises the following steps of: mixing hydrotalcite, deionized water and a ruthenium precursor solution, carrying out ultrasonic dispersion, then performing stirring and dipping treatment, conducting centrifuging and collecting the precipitate, drying the precipitate, and carrying out plasma discharge treatment on the obtained sample to obtain the in-situ prepared superfine ruthenium nano-catalyst. According to the present invention, the superfine ruthenium nanoparticles are prepared in situ by using the glow discharge plasma, so that the nanoparticle agglomeration phenomenon in the conventional chemical preparation method is substantially avoided, andthe prepared superfine ruthenium nano-catalyst shows higher catalytic activity in the catalysis of the N-ethylcarbazole hydrogenation reaction.

Description

technical field [0001] The invention belongs to the technical field of nano catalysts, in particular to an ultrafine ruthenium nano catalyst and a method for preparing the ultrafine ruthenium nano catalyst in situ. Background technique [0002] Hydrogen energy is considered to be the cleanest chemical fuel because it does not emit greenhouse gases after combustion. With the expansion of the field of hydrogen energy utilization, hydrogen storage technology has always been the bottleneck for the large-scale application of hydrogen energy. The current hydrogen storage technology has problems such as high cost, short life, and poor hydrogen storage effect. Liquid organic hydrogen carriers-LOHCs realize hydrogen storage through the reversible dehydrogenation reaction of unsaturated liquid organic matter and hydrogen. Compared with other hydrogen storage methods, liquid organic hydrogen carriers have the advantages of high mass / volume hydrogen storage density, high hydrogen stor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46B01J35/00B01J37/34C01B3/00C07D209/86
CPCB01J35/006B01J35/0066B01J37/349B01J23/007B01J23/462C07D209/86C01B3/0015Y02E60/32
Inventor 白雪峰石加明刘洋
Owner INST OF PETROCHEM HEILONGJIANG ACADEMY OF SCI
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