Gas treatment method and materials

Patent metadata

Field	Value
Publication number	US-11577224-B2
Application number	US-201815968691-A
Country	US
Kind code	B2
Filing date	May 1, 2018
Priority date	May 1, 2018
Publication date	Feb 14, 2023
Grant date	Feb 14, 2023

Abstract

A method is disclosed in which a gas of hydrogen and nitrogen, or hydrogen and ammonia, or hydrogen, nitrogen, and ammonia, is introduced to a fluidized bed. The gas flows through the fluidized bed, and titanium dioxide particles are introduced to the fluidized bed to form a fluid mixture of the particles and gas in the fluidized bed. The particles are reacted with the gas in the fluid mixture to form particles including titanium dioxide and nitrogen. The particles can be disposed along an air flow path in operative communication with a light source for air treatment.

First claim

What is claimed is:

1. An air treatment method, comprising:
introducing a gas to a fluidized bed, said gas comprising hydrogen and ammonia, or comprising hydrogen, nitrogen, and ammonia;
flowing the gas through the fluidized bed, and introducing particles comprising titanium dioxide to the fluidized bed to form a fluid mixture of the particles and gas in the fluidized bed;
reacting the particles with the gas to form particles comprising titanium dioxide and nitrogen, wherein 5 atomic percent to 50 atomic percent nitrogen is integrated into an atomic lattice structure of the titanium dioxide;
disposing the particles along an air flow path in operative communication with a light source; and
activating the light source and contacting the particles with air to be treated.

2. The method of claim 1 , wherein the gas comprises hydrogen and ammonia.

3. The method of claim 1 , wherein the gas comprises hydrogen, nitrogen, and ammonia.

4. The method of claim 1 , wherein the particles have a diameter of 100 nm to 50 μm.

5. The method of claim 1 , wherein the titanium dioxide comprises at least 99 wt. % anatase titanium dioxide.

6. The method of claim 1 , wherein the titanium dioxide comprises anatase and rutile titanium dioxide with an anatase:rutile weight ratio of 99:1 to 1:99.

7. The method of claim 1 , comprising flowing the gas through the fluidized bed at a velocity of 6×10 −8 m/s to 0.2 m/s.

8. The method of claim 1 , comprising introducing the gas to an outer chamber of the fluidized bed, flowing the gas to an inner chamber positioned within the outer chamber, and introducing the particles comprising titanium dioxide to the inner chamber to form the fluid mixture of the particles and the gas in the inner chamber.

9. The method of claim 1 , wherein the air to be treated is onboard an aircraft, and wherein introducing the particles with the air to be treated comprises compressing outside low pressure air and contacting the compressed air with the particles.

10. The method of claim 9 , further comprising delivering the air that has contacted the particles to a conditioned interior airspace.

Assignees

• Hamilton Sundstrand Corp

Inventors

• Mcgee Randolph Carlton

Classifications

• B01J2235/00

  Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title

• B01J35/50

  characterised by their shape or configuration · CPC title

• A61L9/205

  using a photocatalyst or photosensitiser · CPC title

• A61L2209/14

  Filtering means · CPC title

• C01G23/08 Primary

  Drying; Calcining {; After treatment of titanium oxide} · CPC title