Phosphotungstic acid (Phospho Tungstic Acid) is off-white powdery solid or pale yellow fine crystals. It is acidic and has redox properties. It is a multifunctional new catalyst with high catalytic activity and good stability. It can be used for homogeneous and heterogeneous reactions, even as a phase transfer catalyst, and has no pollution to the environment. , is a green catalyst. Phosphotungstic acid is slightly weathering; tungstic acid is soluble in alcohol, ether, and about 0.5 parts of water.
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