Sorbents for removal of nitrogen oxides and method of making

Patent metadata

Field	Value
Publication number	US-2025381553-A1
Application number	US-202519236036-A
Country	US
Kind code	A1
Filing date	Jun 12, 2025
Priority date	Jun 12, 2024
Publication date	Dec 18, 2025
Grant date	—

Abstract

The present disclosure described compositions which may be effective in removing contaminants from a gas stream such as nitrous oxides. The composition may include a sorbent which includes a metal including copper, zinc, or a combination thereof, and optionally includes triethylenediamine. Methods of making such a composition are also described, along with devices which use the composition to remove contaminants from fluid streams, particularly in vehicle tunnels and parking garages.

First claim

What is claimed is:

1 . A composition for removing nitrogen oxides from a fluid stream in a vehicle tunnel, comprising:
a sorbent having a first surface deposition comprising:
about 3 wt. % to about 15 wt. % of a metal comprising copper, zinc, or a combination thereof.

2 . The composition of claim 1 , wherein the first surface deposition further comprises about 1 wt. % to about 6 wt. % triethylenediamine.

3 . The composition of claim 1 , wherein the metal comprises zinc, and the zinc is in the form of zinc oxide, elemental zinc, or combinations thereof.

4 . The composition of claim 1 , wherein the sorbent comprises one or more of activated carbon, natural zeolite, synthetic zeolite, silica, silica gel, alumina, zirconia, diatomaceous earths, metal organic frameworks, or combinations thereof.

5 . The composition of claim 1 , wherein the sorbent comprises coal-based activated carbon.

6 . The composition of claim 1 , wherein the sorbent is in the form of pellets, granules, reagglomerated briquettes, powders, or combinations thereof.

7 . The composition of claim 1 , wherein the composition has not been treated to add molybdenum or silver.

8 . The composition of claim 1 , wherein the metal comprises copper, and the copper is in the form of copper (I) oxide, copper (II) oxide, elemental copper, or combinations thereof.

9 . The composition of claim 1 , wherein the first surface deposition comprises about 5 wt. % to about 10 wt. % copper.

10 . The composition of claim 1 , wherein the nitrogen oxides are nitrogen dioxide, nitrogen monoxide, or combinations thereof.

11 . The composition of claim 1 , wherein the sorbent has an iodine number of about 500 mg/g to about 1000 mg/g.

12 . The composition of claim 1 , wherein the composition exhibits a longer breakthrough time than a composition which does not comprise a sorbent having a first surface deposition comprising about 3 wt. % to about 15 wt. % of a metal comprising copper, zinc, or a combination thereof.

13 . The composition of claim 1 , wherein the composition exhibits a breakthrough time of more than about 100 minutes at 25 ppm nitrogen monoxide (NO) as measured by CBRN testing method 0308 with a bed depth of 3.3 cm and a linear velocity of 12.1 cm/s.

14 . The composition of claim 1 , wherein the composition exhibits a breakthrough time of more than about 200 minutes at 25 ppm nitrogen monoxide (NO) as measured by CBRN testing method 0308 with a bed depth of 3.3 cm and a linear velocity of 12.1 cm/s.

15 . A method of making a composition for removing nitrogen oxides from a fluid stream in a vehicle tunnel, comprising:
contacting a sorbent material with a first solution comprising a copper salt, a zinc-containing compound, or a combination thereof to form an impregnated sorbent material, contacting the sorbent material with a second solution comprising a copper salt, a zinc-containing compound, or a combination thereof to form a doubly impregnated sorbent material, drying the doubly impregnated sorbent material to form a sorbent, and wherein the sorbent material is not impregnated with either of molybdenum or silver.

16 . The method of claim 15 , wherein the zinc-containing compound comprises zinc oxide.

17 . The method of claim 15 , wherein the sorbent material comprises activated carbon, natural zeolite, synthetic zeolite, silica, silica gel, alumina, zirconia, diatomaceous earths, or combinations thereof.

18 . The method of claim 15 , wherein the sorbent material comprises coal-based activated carbon.

19 . The method of claim 15 , wherein the copper salt comprises copper carbonate, copper chloride, copper acetate, copper gluconate, copper formate, copper sulfate, copper nitrate, or combinations thereof.

20 . The method of claim 15 , wherein the first solution further comprises ammonia.

21 . The method of claim 15 , wherein the second solution further comprises ammonia.

22 . The method of claim 15 , further comprising contacting the doubly impregnated sorbent material with triethylenediamine.

23 . The method of claim 22 , wherein contacting the doubly impregnated sorbent material with triethylenediamine comprises immersing the doubly impregnated sorbent material in a solution of triethylenediamine, spraying a solution of triethylenediamine onto a surface of the doubly impregnated sorbent material, mixing dry triethylenediamine with the doubly impregnated sorbent material, or combinations thereof.

Assignees

• Calgon Carbon Corp

Inventors

• Westreich Philippe
• Mazzoccoli Jason P
• Mimna Richard A

Classifications

• B01J20/3204

  Inorganic carriers, supports or substrates · CPC title

• B01J20/20

  comprising free carbon; comprising carbon obtained by carbonising processes · CPC title

• B01J20/3242

  Layers with a functional group, e.g. an affinity material, a ligand, a reactant or a complexing group · CPC title

• B01J20/3236 Primary

  containing metal, other than zeolites, e.g. oxides, hydroxides, sulphides or salts · CPC title

• B01D53/02

  by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)} · CPC title