Preparation method of carbon-loaded Ru base catalyst by carbon thermal reduction

A catalyst and carbothermal technology, applied in the field of catalytic chemistry, can solve the problems of long time consumption, poor dispersion, loss of metal components, etc., and achieve the effects of increasing the load, saving reducing agents, and avoiding danger.

Inactive Publication Date: 2017-05-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These reducing agents usually need to be added in excess, the operation process and conditions are strict, and the steps are cumbersome; repeated cleaning is required after reduction, the loss of metal components is serious, and the metal loading is quite different from the theoretical calculation value.
In addition, the chemical reduction method has strict process requirements, many types of equipment, takes a long time, and has low production efficiency, which is not conducive to large-scale preparation of industrial production.
The gas reduction method mainly uses reducing gases such as hydrogen and carbon monoxide for reduction. The gas reduction effec

Method used

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  • Preparation method of carbon-loaded Ru base catalyst by carbon thermal reduction
  • Preparation method of carbon-loaded Ru base catalyst by carbon thermal reduction
  • Preparation method of carbon-loaded Ru base catalyst by carbon thermal reduction

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Experimental program
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Effect test

Embodiment 1

[0024] After the activated carbon carrier was ground and sieved to 80-100 meshes, it was placed in an oven at 120°C and dried overnight; an equal-volume impregnation method was used to prepare a ruthenium trichloride precursor impregnation solution equal to the saturated water absorption of the carrier, and slowly added to the carrier while stirring. It was mixed evenly, and after ultrasonic treatment, it was left to stand for 24 hours, and then dried overnight in an oven at 110° C. to obtain a powder catalyst precursor (Ru(Cl) / AC) with a loading of 5 wt%.

Embodiment 2

[0026] Take an appropriate amount of the above-mentioned catalyst precursor Ru(Cl) / AC and place it in a quartz tube. Under an Ar atmosphere of 25ml / min, the temperature is raised to 250°C, 350°C, and 450°C for 3 hours at a constant temperature of 3°C / min. Ru / AC-C-250, Ru / AC-C-350, Ru / AC-C-350 were obtained.

Embodiment 3

[0028] h 2 -TPR characterization: take appropriate amount of three kinds of catalyst samples and catalyst precursor Ru(Cl) / AC in the above-mentioned embodiment 2 and place them in a U-shaped quartz tube. 2 / Ar atmosphere, the temperature was programmed to 600°C at 10°C / min. Characterization results such as figure 1 As shown, the results show that in an inert atmosphere, Ru(Cl) / AC can undergo carbothermal reduction to Ru / AC-C at a temperature range above 350 °C.

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Abstract

The invention discloses a preparation method of a carbon-loaded Ru base catalyst with uniform distribution, small grain diameter and high activity by carbon thermal reduction. The preparation method includes steps of taking ruthenium trichloride hydrate as a metal precursor, and taking active carbon, mesoporous carbon, coking carbon, foam carbon and other carbon-containing materials as a carrier; preparing by an equivalent-volume impregnation method; performing carbon thermal reduction in inert gases such as He, Ar, N2 and other atmosphere at 350-600 DEG C; acquiring uniformly distributed and small metal grains, and preparing the high-activity and high-stability carbon-loaded Ru base catalyst.

Description

technical field [0001] The invention relates to the field of catalytic chemistry, in particular to a preparation method of a Ru-based catalyst, which is suitable for the preparation and reduction of a metal catalyst supported by a carbon carrier and the corresponding catalytic reaction process. Background technique [0002] Due to their high activity and other characteristics, transition metal catalysts are widely used in various fields, especially ruthenium-based catalysts have high hydrogenation activity, and have been widely used and important researches in catalytic hydrocracking. The preparation of traditional supported catalysts disperses metal compounds in a solution environment to achieve high dispersion of active components and additives on the carrier. Repeated drying, impregnation, and precipitation are required. After the catalyst precursor is prepared, a reducing agent is often used to support the catalyst. The metal components are reduced to obtain nano-metal p...

Claims

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Application Information

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IPC IPC(8): B01J23/46B01J23/755B01J23/652C07C55/10C07C51/36
Inventor 徐杰黄倩倩于维强苗虹路芳高进
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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