Ammonium metatungstate petrochemical catalyst is a catalyst based on ammonium metatungstate (AMT), which has a wide range of applications in the petrochemical field. The following is a detailed explanation of ammonium metatungstate petrochemical catalyst:
Chemical formula and properties
The chemical formula of ammonium metatungstate is usually (NH4)6H2W12O40·XH2O, in which the content of W is as high as 72%, and the valence of W is +6. It is a white or slightly yellow crystalline powder, slightly acidic, soluble in water, but insoluble in ethanol.
Application field
Ammonium metatungstate is an important component of petrochemical catalysts, especially suitable for the manufacture of high-efficiency tungsten catalysts.
It is widely used as a catalyst in organic synthesis reactions, which can promote the reaction, improve reaction efficiency and product selectivity. In the process of petroleum refining, ammonium metatungstate is used as a catalyst to help crack heavy hydrocarbons into more valuable light hydrocarbons.
Catalyst Characteristics
Petroleum catalysts containing ammonium metatungstate usually have high catalytic activity, good selectivity and excellent water solubility.
These catalysts also have a long service life, which helps to reduce production costs and improve production efficiency.
Preparation methods
The preparation methods of ammonium metatungstate include thermal degradation, liquid-liquid extraction, ion exchange, electrodialysis, neutralization and acid hydrolysis alcohol precipitation. The selection of these methods depends on factors such as raw materials, cost, product quality and environmental protection requirements.
Solubility and decomposition temperature
The solubility of ammonium metatungstate in water increases with increasing temperature. For example, at 20°C, its solubility in water is 303.9g/100gH2O. The decomposition temperature of ammonium metatungstate varies depending on the degree of completion of the decomposition reaction. At higher temperatures, such as above 600°C, ammonium metatungstate can be completely decomposed into tungsten trioxide (WO3).
In summary, ammonium metatungstate petrochemical catalyst is a high-efficiency catalyst based on ammonium metatungstate with broad application prospects and excellent performance characteristics. In the field of petrochemicals, it is of great significance in improving product quality, reducing production costs and protecting the environment.
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