Global Patent Index - EP 1049816 A1

EP 1049816 A1 2000-11-08 - ELECTROCATALYTICALLY ACTIVE NON-CARBON METAL-BASED ANODES FOR ALUMINIUM PRODUCTION CELLS

Title (en)

ELECTROCATALYTICALLY ACTIVE NON-CARBON METAL-BASED ANODES FOR ALUMINIUM PRODUCTION CELLS

Title (de)

ELEKTROKATALYSCHE AKTIEVE KOHLENSTOFF-FREIE ANODE AUF BASIS VON METALLEN ZUR ANWENDUNG IN ALUMINIUM IN ALUMINIUM-HERSTELLUNGSZELLEN

Title (fr)

ANODES METALLIQUES EXEMPTES DE CARBONE A ACTIVITE ELECTROCATALYTIQUE POUR DES CELLULES ELECTROLYTIQUES DE PRODUCTION D'ALUMINIUM

Publication

EP 1049816 A1 (EN)

Application

EP 99900108 A

Priority

  • IB 9900080 W
  • IB 9800080 W
  • IB 9800081 W
  • US 12611498 A
  • US 12620698 A

Abstract (en)

[origin: WO9936592A1] A non-carbon, metal-based high temperature resistant anode of a cell for the production of aluminium has a highly conductive metal-based substrate coated with one or more electrically conductive adherent intermediate protective layers and an outer layer which is electrically conductive and electrochemically active. The electrochemically active layer contains one or more electrocatalysts fostering the oxidation of oxygen ions as well as fostering the formation of biatomic molecular gaseous oxygen from the monoatomicnascent oxygen obtained by the oxidation of the oxygen ions present at the surface of the anode in order to inhibit ionic and/or monoatomic oxygen penetration. The intermediate layer(s) constitute(s) a substantially impermeable barrier to ionic, monoatomic and/or biatomic gaseous oxygen to prevent attack of the metal-based substrate. The electrocatalyst can be iridium, palladium, platinum, rhodium, ruthenium, silicon, tin, zinc, Mischmetal oxides and metals of the Lanthanide series. The applied layer usually comprises electrochemically active constituents selected from oxides, oxyfluorides, phosphides, carbides, in particular spinels such as ferrites.

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

C25C 3/12; C25C 7/02

IPC 8 full level (invention and additional information)

C25C 3/12 (2006.01); C25C 7/02 (2006.01)

CPC (invention and additional information)

C25C 7/025 (2013.01); C25C 3/12 (2013.01)

Citation (search report)

See references of WO 9936592A1

Designated contracting state (EPC)

DE ES FR GB IT NL

EPO simple patent family

WO 9936592 A1 19990722; AU 1779699 A 19990802; EP 1049816 A1 20001108

INPADOC legal status


2007-02-14 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20060801

2003-07-16 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: MOLTECH INVENT S.A.

- Ref Legal Event Code: RAP1

2000-11-08 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000808

2000-11-08 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

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