Although both ammonium metatungstate (AMT) and ammonium paratungstate (APT) are ammonium tungstate compounds, their differences are significant. Structurally, the Keggin-type monomeric cluster of AMT makes it more soluble, while the aggregated structure of APT leads to poor solubility. In terms of physical properties, AMT has a lower density and extremely high water solubility, whereas APT is more stable and suited for high-temperature solid-state processes. Chemically, AMT is more reactive and suitable for solution-based processes, while APT tends to be an intermediate for tungsten powder production.
These differences directly determine their applications: AMT is widely used in catalysts and solution-based processes, while APT dominates the tungsten metallurgy field.
For example, when preparing a tungsten-based catalyst, AMT can be dissolved and mixed directly with a support, while APT may need to be acidified or decomposed first, making the process more cumbersome. This characteristic difference is like two brothers with different strengths: AMT is the flexible “chemist,” while APT is the steady “metallurgist.”
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