Method for preparing nickel-tungsten bimetallic carbide catalyst by organic-inorganic hybrid route and application of nickel-tungsten bimetallic carbide catalyst

Abstract

The invention discloses a method for preparing a nickel-tungsten bimetallic carbide catalyst by an organic-inorganic hybrid route and application of the nickel-tungsten bimetallic carbide catalyst, and belongs to the technical field of material preparation and application. The method is characterized in that pure phase Ni6W6C and W2C and Ni6W6C composite materials with different Ni contents are synthesized by the organic-inorganic hybrid route and both exhibit a nano-particle stacking and aggregation form with a length of about 0.3-4 mu m and a diameter of about 300-900 nm. The BET specific surface area of the nickel-tungsten bimetallic carbide ranges from 17.6 m<2> / g to 15.7 m<2> / g. Compared with the traditional arc melting method and temperature programmed reduction method, the method provided by the invention has the advantages of low temperature, simple operation, energy saving, small product particles and less surface carbon pollution. The industrial application prospect is optimistic, the prepared bimetallic carbide catalyst can be applied to hydrogenation, hydrogenolysis, dehydrogenation, deoxygenation, isomerization, methane syngas, water-gas shift, hydrogen evolution reaction and catalyst support and the like.

Description

technical field [0001] The invention belongs to the field of material preparation technology and application, and relates to an organic-inorganic hybrid route for preparing a nickel-tungsten double metal carbide catalyst and its application. Background technique [0002] Nickel-tungsten bimetallic carbide catalysts have a wide range of applications and can be used for hydrogenation, hydrogenolysis, dehydrogenation, deoxygenation, isomerization, methane synthesis gas, water gas shift, hydrogen evolution reaction and catalyst support. [0003] At present, there have been many methods for the synthesis of nickel-tungsten bimetallic carbides. The earliest attempt was the arc melting method, which required high energy consumption due to the high temperature and long annealing time required, and the product usually had a low surface area, which limited its application in catalysis. Another common method is the temperature-programmed reduction method, through which hydrocarbon gas...

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Problems solved by technology

And it is difficult to completely convert, because the reaction only occurs at the gas-solid interface

Meanwhile, the pyrolysis of excess carbon-containing gas easily leads to polymer carbon contamination on the surface of bimetallic carbide particles, seriously reducing the active sites of the catalyst.

In addition, stringent and complex synthesis conditions, such as precise control of the temperature increase rate (generally not greater than 1 °C / min) and gas composition and flow rate, severely limit the large-scale fabrication of carbide materials.

[0004] At present, there are relatively few reports on the preparation of nickel-tungsten bimetallic carbides (Xiao T C, Wang H T, York A P E, et al.Preparation of nickel-tungsten bimetallic carbide catalysts[J].J Catal,2002,209(2) :318-330 and Al-Megren H A, Gonzalez-Cortes S L, Xiao T, et al.A comparative study of the catalytic performance of Co-Mo and.Co(Ni)-Wcarbide catalysts in the hydrogenenitrogenation(HDN)reaction of pyridine[ J].Applied Catalysis a-General,2007,329:36-45.), and the reported nickel-tungsten double metal carbides often have phase separation

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