Mercury removal sorbents

Patent metadata

Field	Value
Publication number	US-9295984-B2
Application number	US-201313834266-A
Country	US
Kind code	B2
Filing date	Mar 15, 2013
Priority date	Mar 15, 2013
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

Sorbents and methods of using them for removing mercury from flue gases over a wide range of temperatures are disclosed. Sorbent materials of this invention comprise oxy- or hydroxyl-halogen (chlorides and bromides) of manganese, copper and calcium as the active phase for Hg 0 oxidation, and are dispersed on a high surface porous supports. In addition to the powder activated carbons (PACs), this support material can be comprised of commercial ceramic supports such as silica (SiO 2 ), alumina (Al 2 O 3 ), zeolites and clays. The support material may also comprise of oxides of various metals such as iron, manganese, and calcium. The non-carbon sorbents of the invention can be easily injected into the flue gas and recovered in the Particulate Control Device (PCD) along with the fly ash without altering the properties of the by-product fly ash enabling its use as a cement additive. Sorbent materials of this invention effectively remove both elemental and oxidized forms of mercury from flue gases and can be used at elevated temperatures. The sorbent combines an oxidation catalyst and a sorbent in the same particle to both oxidize the mercury and then immobilize it.

First claim

The invention claimed is:

1. A solid sorbent in the form of particles to remove mercury from gas streams, comprising: a multi-valent metal oxide solid support, and a manganese-oxy-halide oxidation catalyst bonded to the multi-valent metal oxide solid support, wherein the multi-valent metal oxide solid support is a multi-valent metal oxide selected from the group consisting of manganese oxide and ceria.

2. The sorbent of claim 1 , wherein the particles have an average diameter of at most 200 microns.

3. The sorbent of claim 1 , wherein the particles have an average diameter of 80 to 150 microns.

4. The sorbent of claim 1 , wherein the particles have an average diameter of at most 50 microns.

5. The sorbent of claim 1 , wherein the particles have an average diameter of 1 to 20 microns.

6. The sorbent of claim 1 , wherein the manganese-oxy-halide comprises a halide that is selected from the group consisting of bromide, chloride, fluoride, and iodide.

7. The sorbent of claim 1 , wherein the manganese-oxy-halide comprises a halide that is selected from the group consisting of bromide, and chloride.

8. The sorbent of claim 1 , wherein the manganese-oxy-halide is selected from the group consisting of MnO 2 ·MnBr 2 , Mn 3 O 4 ·MnBr 2 , and Mn 2 O 3 ·MnBr 2 .

9. The sorbent of claim 1 , wherein the mutli-valent metal oxide is manganese oxide.

10. The sorbent of claim 1 , wherein the solid support has a surface area of at least 10 m 2 /g.

11. The sorbent of claim 1 , wherein the solid support has a surface area of at least 100 m 2 /g.

Assignees

• Alptekin Gokhan
• Tda Research Inc

Inventors

• Alptekin Gokhan

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

• B01J2235/15

  X-ray diffraction · CPC title

• B01J37/22

  Halogenating · CPC title

• B01J35/1014

  Operations & Transport · mapped topic

• B01J20/103

  comprising silica · CPC title