Tungsten Nitride Ammonia Synthesis Catalyst
Tungsten nitride (W2N) is a catalytic phase for high-pressure ammonia synthesis, offering an alternative to the Haber-Bosch process. This inorganic nitride acts as a reaction accelerator. It falls under tariff item 3815.90.00 for other catalytic preparations.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported as a pure nitride compound
Tungsten nitride as a pure compound is classified under inorganic compounds in heading 2850.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Ensure the product is not classified as a separate nitride compound under Chapter 28
• Provide evidence of catalytic use in ammonia synthesis
• Verify any safety regulations for handling nitrides
Related Products under Tariff item 3815.90.00
Aluminum Chlorohydrate Catalyst
Catalytic-grade aluminum chlorohydrate used in polymerization processes for water treatment resins. This product consists entirely of inorganic aluminum compounds acting as reaction accelerators, falling under tariff item 3815.90.00.
Ammonium Molybdate Catalyst
Ammonium heptamolybdate ((NH4)6Mo7O24) is used as a selective oxidation catalyst in acrylic acid production. It is a wholly inorganic molybdenum-based catalytic preparation. This places it under tariff item 3815.90.00 for other catalytic preparations.
Bismuth Molybdate Selective Oxidation Catalyst
Bismuth molybdate (Bi2Mo3O12) is a mixed metal oxide catalyst used to selectively oxidize propylene into acrolein. Its multilayer structure provides high selectivity in this reaction. As a wholly inorganic catalytic preparation, it falls under tariff item 3815.90.00 for reaction initiators and catalytic preparations not elsewhere specified.
Bismuth Nitrate Catalyst
Bismuth nitrate is used as a catalytic preparation in organic synthesis, including esterification and oxidation reactions. It acts as a reaction initiator consisting wholly of inorganic bismuth compounds. This places it under tariff item 3815.90.00 for other catalytic preparations.
Bismuth Subnitrate Catalytic Promoter
Bismuth subnitrate serves as a promoter in automotive catalytic converters and NOx reduction systems, enhancing thermal stability. This basic bismuth nitrate is a wholly inorganic reaction accelerator. It is classified under tariff item 3815.90.00 as a catalytic preparation.
Bismuth Triflate Reaction Initiator
Bismuth(III) triflate is a water-tolerant Lewis acid catalyst used in aldol reactions and glycosylations. This inorganic bismuth compound acts as a reaction initiator in organic synthesis. It is classified under tariff item 3815.90.00 for other catalytic preparations.