Tungsten Oxide Hydrodesulfurization Catalyst
Tungsten oxide (WO3) catalysts promoted with nickel or cobalt are used for hydrodesulfurization of petroleum fractions. This inorganic tungsten compound functions as a reaction accelerator and is not a separate chemically defined element. It falls under tariff item 3815.90.00 as a supported catalyst preparation.
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 the catalyst is unsupported
Unsupported catalysts are classified under a different subheading.
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 catalyst is not classified as a pure tungsten oxide compound
• Provide details on the support material and promoters
• Verify compliance with Canadian petroleum refining regulations
Related Products under Tariff item 3815.90.00
Ammonium Molybdate Catalyst
Ammonium heptamolybdate ((NH4)6Mo7O24) is used as a selective oxidation catalyst in acrylic acid production. This inorganic molybdenum-based catalytic preparation functions as a reaction accelerator. It is not a separate chemically defined element and qualifies for tariff item 3815.90.00.
Bismuth Molybdate Selective Oxidation Catalyst
Bismuth molybdate (Bi2Mo3O12) is a mixed metal oxide catalyst used for the selective oxidation of propylene to acrolein. It is a supported catalyst preparation designed to accelerate specific chemical reactions, falling under the 'other' category of supported catalysts. Its inorganic composition and catalytic function align with tariff item 3815.90.00.
Bismuth Nitrate Catalyst
Bismuth nitrate is an inorganic bismuth salt used as a catalyst in organic synthesis, including esterification and oxidation reactions. It functions as a reaction initiator or accelerator in chemical processes, qualifying as a catalytic preparation. This product is not a separate chemically defined element and is not excluded by chapter notes, so it fits under tariff item 3815.90.00.
Bismuth Subnitrate Catalytic Promoter
Bismuth subnitrate is a basic bismuth nitrate used as a promoter in automotive catalytic converters and NOx reduction systems. It enhances the thermal stability and activity of the catalyst, functioning as a reaction accelerator. This inorganic preparation is not a separate chemically defined compound and is suitable for tariff item 3815.90.00.
Bismuth Triflate Reaction Initiator
Bismuth(III) triflate is a water-tolerant Lewis acid catalyst used in aldol reactions and glycosylations. It acts as a reaction initiator in organic synthesis, and its inorganic bismuth content qualifies it as a catalytic preparation. This product is not a separate chemically defined element and falls under tariff item 3815.90.00.
Mercuric Sulfate Catalyst
Mercuric sulfate (HgSO4) is a preparation used as a catalyst in acetylene hydration to acetone production. This inorganic mercury compound acts as a reaction initiator and is not a separate chemically defined element. It falls under tariff item 3815.90.00, subject to environmental regulations on mercury.