The reactive site of tungsten oxide (WO₃) refers to a specific position or structure on its surface with higher reactivity. These active sites facilitate the initiation and catalysis of chemical reactions. The surface of tungsten oxide has abundant active sites, including oxygen vacancies, tungsten defects, boundary sites, etc. These sites have different surface energies and chemical properties, which can interact with reactants and lower the energy barrier of the reaction, thereby enhancing the reaction rate and selectivity. In catalytic reactions, the active sites of tungsten oxide can provide adsorption capacity, electron transfer capacity and acid-base properties, etc., which affect the adsorption, activation and conversion of reactants. Different reactions require different types of active sites to provide proper catalytic function. For example, acidic sites can catalyze acid-catalyzed reactions, redox sites can catalyze redox reactions, and adsorption sites can catalyze both adsorption and reactions.
By adjusting the crystal structure, surface morphology and defect structure of tungsten oxide, the number and properties of its active sites can be adjusted, and then the catalytic performance and reactivity can be adjusted. In addition, the combined use of auxiliary agents or co-catalysts can also change the active sites and catalytic properties of tungsten oxide to achieve more efficient catalytic reactions. The specific active sites of tungsten oxide may vary in different catalytic reactions. Therefore, in research and application, it is necessary to determine the active site of tungsten oxide according to the requirements of the specific reaction, and to perform corresponding characterization and regulation. In short, the reactive site of tungsten oxide is a specific position or structure with high reactivity on its surface, which can promote the occurrence of catalytic reaction. The nature and quantity of these active sites will affect the catalytic performance and reactivity of tungsten oxide.
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