Advanced Technology

Preferential Oxidation (PROX) Catalyst for Carbon Monoxide
PROX = Preferential Oxidation

This catalyst is used to selectively oxidize carbon monoxide from reforming gas in PEFC.

Because carbon monoxide (CO) poison electrodes, and deteriorate battery performance, the concentration of CO in the reforming gas should be below 10ppm.


  • ・Highly dispersed precious metal helps maintain a highly activated state even in regions with high space velocity
  • ・Maintains a highly activated state over a wide temperature range, from low to high
  • ・Maintains a highly activated state even at a low precious metal content, making it possible to provide catalyst at low cost
Product name Shape Features
TSSA-5 Spherical
about φ2mm
・Highly activated over a widetemperature range
・High durability

Example characteristic of PROX catalyst

This data is the result of initial measurement at TANAKA and is for reference only.

How to use PROX catalysts

How to use PROX catalysts

*We offer consultations regarding the trial manufacture and contract production of catalysts that have been customized in accordance with customer needs.