Monodisperse transition metal nanocatalyst for Fischer-Tropsch synthesis as well as preparation method and application thereof

Abstract

The invention discloses a monodisperse transition metal nanocatalyst for Fischer-Tropsch synthesis as well as a preparation method and application thereof. The catalyst comprises transition metals, wherein the transition metals are stably dispersed in an organic solvent in a monodisperse metal nanoparticle state; the particle size of the transition metal is 1-100nm; and the specific surface area of the catalyst is 5-300m<2> / g. According to the method disclosed by the invention, the particle size of the active ingredients can be regulated and controlled, so that the size of the metal nanoparticles is controllable, and the metal nanoparticles do not need to be embedded into a carrier surface; and therefore, the specific surface area of the active ingredients is enlarged, and the catalytic performance of the catalyst is improved. According to the catalyst disclosed by the invention, the dispersity of the metal nanoparticles is high, and when the catalyst is used for a slurry bed reaction system, the catalyst can be directly applied to a Fischer-Tropsch synthesis reaction without complicated filtering separation, cleaning, high-temperature roasting and activated reduction, and the catalyst has extremely excellent catalytic activity.

Description

technical field [0001] The invention relates to a Fischer-Tropsch synthesis catalyst, in particular to a monodisperse transition metal nano-catalyst for Fischer-Tropsch synthesis, a preparation method and application thereof. Background technique [0002] Through the Fischer-Tropsch synthesis technology, the synthesis gas obtained from the gasification of carbon-containing raw materials such as coal, natural gas and biomass can be converted into target products mainly composed of alkanes and olefins. These products hardly contain sulfur, nitrogen and aromatic compounds, and are easy to produce. Processing into environmentally friendly clean fuels is an ideal way to make full use of recyclable carbonaceous raw materials to replace traditional fossil fuels. Fischer-Tropsch synthesis technology has important energy security and environmental protection significance in the context of my country's crude oil imports and environmental requirements, and has received extensive attent...

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Problems solved by technology

However, due to the existence of crystallization water in nitrate, on the one hand, the hydrogen bond on the surface of metal grains is increased, which intensifies the agglomeration between primary grains (T.He, D.Chen, X.Jiao, Controlled Synthesis of Co 3 o 4 Nanoparticles through Oriented Aggregation, Chem.Mater., 16(2004) 737-743), on the other hand lead to an increase in the decomposition temperature of cobalt nitrate, the rapid formation and growth of metal nuclei, the interaction of the two factors leads to the final Larger secondary agglomerated grains (Li Zezhuang, Chen Jiangang, Wang Yuelun, Sun Yuhan, monodisperse Co / SiO 2 Catalyst preparation and its F-T synthesis performance [J], "Industrial Catalysis", 2009(9), Vol. 17, 43-47)

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