Abstract
A promising method for the synthesis of ultrafine carbide particles is the sol–gel method using dispersions of molybdenum–tungsten nanoparticles. For further use, the main properties of molybdenum-blue nanoparticles, including the size, structure, and stability, under different conditions must be determined. The synthesis of dispersions of molybdenum–tungsten blue was carried out as a result of the reduction of molybdate and tungstate ions in the presence of hydrochloric acid. Ascorbic acid was chosen as a reducing agent and further acted as a carbon source. Dispersions and nanoparticles were investigated by transmission electronic microscopy (TEM), UV/vis and infrared (FTIR) spectroscopy, and dynamic light scattering (DLS).
Highlights
The use of highly dispersed transition metal carbides is one of the promising directions in the development of some catalytic processes, including hydrogen evolution reactions and the production of synthesis gas [1,2,3]
The sol–gel method using molybdenum–tungsten blue as a dispersed system can be chosen as such a method
It was necessary to establish the optimal content of reducing agents in the system
Summary
The use of highly dispersed transition metal carbides is one of the promising directions in the development of some catalytic processes, including hydrogen evolution reactions and the production of synthesis gas [1,2,3]. To obtain a carbide with a small particle size and high surface area, various methods are used, including solid-phase and liquidphase methods [4,5,6]. Polyoxometalate complexes have a constant size of the order of 3–5 nm [7,8,9] The use of such a highly dispersed precursor of mixed Mo-W carbides will lead to the formation of a carbide phase with a nanometer particle size and high surface area [10]. The first stage in the development of a method for obtaining highly dispersed carbides is to establish the conditions for forming the molybdenum–tungsten blue nanoparticles and the way in which to obtain stable dispersions based on them
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