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

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...

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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 effect is better, but hydrogen is a flammable and explosive gas, and carbon monoxide is toxic; and gas reduction usually requires higher temperatures. Easy to reunite and grow, poor dispersion

CN1270081A has described the preparation method that earlier impregnates carrier with ruthenium compound solution, reduces under hydrogen atmosphere and then impregnates cocatalyst, but the catalyst activity that prepares is lower

Although these preparation methods can prepare ruthenium carbon catalysts with certain activity or selectivity and meet certain requirements, the preparation methods are relatively cumbersome and do not show excellent universal characteristics.

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