Method for producing metal oxide and / or metalloid oxide

By using ammonia gas to be directly released into the flame in the burner head design and adjusting the gas ratio, the problems of reduced production capacity and increased costs caused by dilution of raw materials in the flame hydrolysis method were solved. This enabled the efficient production of metal oxides with high BET surface area, improving the throughput and economy of the plant.

CN122161777APending Publication Date: 2026-06-05EVONIK OPERATIONS GMBH
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Patent Information

Application Number
CN202480070810.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-11-08
Filing Date
2024-10-29
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing flame hydrolysis methods require the use of diluted feedstock streams such as air or steam when producing metal and near-metal oxides with high BET surface areas, resulting in reduced production capacity and increased costs.

Method used

A burner head design is adopted, which provides oxygen-containing gas, fuel gas and gaseous metal precursor to the burner head through at least two channels and an outlet end. Ammonia is released directly into the flame through a separate channel to avoid premixing. Ammonia is used to partially replace hydrogen as fuel gas, and the gas ratio is adjusted to control the flame temperature.

Benefits of technology

This technology enables the production of metal oxides with high BET surface areas at high throughput, reduces the need for cooling gases, improves production efficiency and economy, and enhances the mechanical and chemical stability of metal oxides.

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Abstract

The invention relates to a flame hydrolysis method for producing metal oxides and / or metalloid oxides by means of a burner having a burner head with at least two gas channels and an outlet end, wherein the metal oxide or metalloid oxide is selected from oxides of aluminum (Al), titanium (Ti), zirconium (Zr), yttrium (Y), lithium (Li), magnesium (Mg), lanthanum (La), cerium (Ce), iron (Fe), zinc (Zn) and silicon (Si) or mixtures thereof, the method comprising the steps of: providing an oxygen-containing gas, a fuel gas and a gaseous metal precursor and / or a mixture comprising gaseous metal precursors to the burner head; providing a flame by combusting at least a portion of the oxygen-containing gas and the fuel gas at an outlet end of the burner head; releasing the MP and / or the MP-containing mixture into the provided flame, and providing gaseous ammonia (NH3) and / or a gaseous mixture containing ammonia (NH3) in at least one gas channel to the outlet end of the burner head and releasing the gaseous ammonia into the flame, and wherein ammonia (NH3) is not premixed with the metal precursor prior to the outlet end of the burner head.
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