The specific mechanism of action of ammonium metatungstate in catalyst synthesis can be summarized as follows:
Raw material transformation and active center formation
As one of the raw materials in catalyst synthesis, ammonium metatungstate can be transformed into catalytically active compounds after specific chemical reaction and preparation process. These active compounds can form the active center of the catalyst and play a key role in the catalytic reaction.
Improvement of catalyst performance
The introduction of ammonium metatungstate can significantly improve the performance of catalysts. For example, in HDS catalysts, the addition of ammonium metatungstate can optimize the active center of the catalyst and improve its ability to remove impurities such as sulfur and nitrogen from fuel oil. This enhancement enhances the activity of the catalyst, thereby improving reaction efficiency and product selectivity.
Improvement of catalyst stability
Ammonium metatungstate has good chemical and thermal stability. Adding ammonium metatungstate in catalyst synthesis can improve the overall stability of the catalyst, so that it can maintain catalytic activity for a long time under high temperature, high pressure and other harsh conditions, and prolong the service life of the catalyst.
Influence on the acidity and activity of catalyst
The addition of ammonium metatungstate can adjust the acidity and activity of catalyst. In the process of catalyst synthesis, by adjusting the addition amount of ammonium metatungstate and the preparation process, the acidity and activity distribution of the catalyst can be controlled, so as to optimize the conditions and effects of the catalytic reaction.
Optimization of pore structure and surface properties of catalysts
The introduction of ammonium metatungstate can affect the pore structure and surface properties of catalysts. For example, in the preparation of tungsten phosphide nanocatalysts, the addition of ammonium metatungstate can increase the specific surface area and porosity of the catalysts and provide more active sites, thus improving the catalytic efficiency and activity of the catalysts.
Synergistic effect with other components
In catalyst synthesis, ammonium metatungstate is usually used together with other components (e.g. alumina, silica gel, etc.). Interactions and synergistic effects occur between these components, further affecting the performance and stability of the catalyst. Ammonium metatungstate, as a part of it, jointly promotes the catalytic reaction through the synergistic effect with other components.
In summary, ammonium metatungstate plays a role in the synthesis of catalysts through various aspects such as raw material conversion, improving catalyst performance, improving catalyst stability, influencing catalyst acidity and activity, optimizing catalyst pore structure and surface properties, and synergistic effects with other components. These mechanisms of action together promote the catalytic reaction and improve the catalytic efficiency and activity of the catalyst.
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