Method of regenerating used denitration catalyst

Patent metadata

Field	Value
Publication number	US-10549264-B2
Application number	US-201615566047-A
Country	US
Kind code	B2
Filing date	Apr 13, 2016
Priority date	Apr 17, 2015
Publication date	Feb 4, 2020
Grant date	Feb 4, 2020

Abstract

A used denitration catalyst is regenerated by means of a method comprising bringing the used denitration catalyst comprising titanium oxide as an essential ingredient into contact with a suspension of particles comprising manganese oxide, subjecting the resulting product to a liquid draining, and subjecting the liquid-drained product to a drying process, additionally, further comprising impregnating a solution comprising a compound containing at least one element selected from the group consisting of vanadium, molybdenum and tungsten into the denitration catalyst after the drying process, and subjecting the impregnated product to a drying treatment.

First claim

The invention claimed is:

1. A method for regenerating used denitration catalyst, comprising:
bringing a used denitration catalyst, to which arsenic and phosphorus coming from an exhaust gas adhere, comprising titanium oxide as an essential ingredient into contact with a suspension comprising a suspensoid composed of particles comprising manganese oxide,
wherein the particles comprising manganese oxide are manganese oxide-supported on aluminum oxide particles or manganese oxide-supported on titanium oxide particles,
subjecting the resulting product to a removal of the suspensoid and a liquid draining, and
subjecting the suspensoid-removed and liquid-drained product to a drying process,
whereby the arsenic and phosphorus are removed from the used denitration catalyst.

2. The method for regenerating used denitration catalyst according to claim 1 , wherein the manganese oxide is MnO or Mn 3 O 4 .

3. The method for regenerating used denitration catalyst according to claim 1 , further comprising:
impregnating a solution comprising a compound containing at least one element selected from the group consisting of vanadium, molybdenum and tungsten into the denitration catalyst after the drying process, and
subjecting the impregnated product to a drying treatment.

4. The method for regenerating used denitration catalyst according to claim 3 , wherein the manganese oxide is MnO or Mn 3 O 4 .

5. The method according to claim 1 , wherein the used denitration catalyst is a honeycomb shaped catalyst comprising a catalytic active substance, or a catalyst comprising a plate-shaped substrate and a catalytic active substance supported on the plate-shaped substrate, wherein the titanium oxide is employed as the catalytic active substance.

6. The method according to claim 3 , wherein the used denitration catalyst is a honeycomb shaped catalyst comprising a catalytic active substance, or a catalyst comprising a plate-shaped substrate and a catalytic active substance supported on the plate-shaped substrate, wherein the titanium oxide is employed as the catalytic active substance.

Assignees

• Mitsubishi Hitachi Power Sys

Inventors

• Kai Keiichiro
• Kato Yasuyoshi
• Imada Naomi

Classifications

• B01J38/48

  Liquid treating or treating in liquid phase, e.g. dissolved or suspended · CPC title

• B01J38/64

  using alkaline material; using salts · CPC title

• B01J21/063

  Titanium; Oxides or hydroxides thereof · CPC title

• B01J23/92

  of catalysts comprising metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 · CPC title

• B01J38/485

  Impregnating or reimpregnating with, or deposition of metal compounds or catalytically active elements · CPC title