Global patent index - EP 0989903 A1

EP 0989903 A1 2000-04-05 - STORAGE CATALYST

Title (en)

STORAGE CATALYST

Title (de)

SPEICHERKATALYSATOR

Title (fr)

POT CATALYTIQUE A ACCUMULATION

Publication

EP 0989903 A1 (DE)

Application

EP 98928339 A

Priority

  • DE 19724545 A
  • EP 9803252 W

Abstract (en)

[origin: DE19724545A1] The invention relates to a storage catalyst for a flow of waste gases, especially of a combustion engine operating alternately on lean and rich fuel, preferably a diesel engine or a lean mixture engine, or for the waste gases of a combustion plant. The inventive catalyst comprises a constituent which is capable of catalytic reduction of nitric oxides at least in the presence of hydrocarbons, and a constituent which stores NOx at least below 100 DEG C. The catalytic constituent has the general chemical formula AaBbO4, wherein A is one or several bivalent metals, B is one or several trivalent metals, a + b </= 3 and a, b > 0. Said catalytic constituent also has at least microscopically a crystalline or crystal-like cubic grid structure with face-centred oxygen ions and tetrahedral or octahedral vacancies. The A-particles and up to 50 % of the B-particles are situated in said tetrahedral vacancies and the rest of the B-particles are situated in said octahedral vacancies. The reaction enthalpy or the chemical activity between the catalytic constituent and the NOx storage constituent is low at least up to temperatures of 600 DEG C, preferably 800 DEG C.

IPC 1-7 (main, further and additional classification)

B01D 53/94; B01J 23/00

IPC 8 full level (invention and additional information)

B01D 53/94 (2006.01); B01J 23/00 (2006.01); B01J 23/80 (2006.01); B01J 23/89 (2006.01); F01N 3/08 (2006.01)

CPC (invention and additional information)

F01N 3/0842 (2013.01); B01D 53/9422 (2013.01); B01J 23/005 (2013.01); B01J 23/80 (2013.01); F01N 3/0814 (2013.01); B01D 2255/1023 (2013.01); B01D 2255/2042 (2013.01); B01D 2255/2047 (2013.01); B01D 2255/20707 (2013.01); B01D 2255/20723 (2013.01); B01D 2255/20761 (2013.01); B01D 2255/20776 (2013.01); B01D 2255/2092 (2013.01); B01D 2255/50 (2013.01); B01D 2255/91 (2013.01); Y10S 502/524 (2013.01)

Citation (search report)

See references of WO 9856492A1

Designated contracting state (EPC)

DE ES FR GB IT

EPO simple patent family

DE 19724545 A1 19981224; CN 1263480 A 20000816; CZ 9904445 A3 20000614; EP 0989903 A1 20000405; JP 2000512907 A 20001003; MX 9911500 A 20000401; US 6395244 B1 20020528; WO 9856492 A1 19981217

INPADOC legal status

2003-04-09 [18W] WITHDRAWN

- Ref Legal Event Code: 18W

- Effective date: 20030204

2001-08-22 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20010706

2000-04-05 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 19991124

2000-04-05 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE ES FR GB IT