The Influence of CO2, C3H6, NO, H2, H2O or SO2 on the Low-Temperature Oxidation of CO on a Cobalt-Aluminate Spinel Catalyst (Co1.66Al1.34O4)
Journal article, 2001

A preparation method for making a high temperature stable monolith catalyst, using a cobalt-rich cobalt-aluminate spinel (Co1.66Al1.34O4) as the active material, is proposed. This catalyst, which is known for being active for CO oxidation at low temperatures, was prepared and characterised by BET, SEM, XRD, XPS and CO-TPD. The catalyst was tested for its capacity to oxidise carbon monoxide using oxygen only and oxygen in combination with other compounds typically present in cold start exhausts from Otto engines, i.e. CO2, C3H6. NO, H2, H2O or SO2. When the catalytic activity was tested with only CO and O-2 present in the feed gas, complete conversion was reached at room temperature. When other compounds were present in the gas mixture, they inhibited the CO oxidation to various degrees. The degree of inhibition for the compounds investigated was found to be: SO2 > H2O > NO = C3H6 > H2 > CO2. The main reason for the loss of activity is suggested to origin from the compounds adsorption and formation of different species on the cobalt oxide surface, which seems to inhibit the reduction and/or re-oxidation process of the metal oxide surface and/or the adsorption of CO.

BET

C2H6

catalyst pre-treatment

SEM

low-temperature activity

XRD

NOx

catalytic oxidation of carbon monoxide

SO2

XPS

cold start emissions

H2O

cobalt-aluminate

CO-TPD

CO

H-2

CO2

Author

Peter Thormählen

Competence Centre for Catalysis (KCK)

Chalmers, Applied Physics, Chemical Physics

Erik Fridell

Competence Centre for Catalysis (KCK)

Chalmers, Applied Physics, Chemical Physics

Neil Cruise

Competence Centre for Catalysis (KCK)

Department of Applied Surface Chemistry

Magnus Skoglundh

Department of Applied Surface Chemistry

Competence Centre for Catalysis (KCK)

Anders Palmqvist

Competence Centre for Catalysis (KCK)

Department of Applied Surface Chemistry

Applied Catalysis B: Environmental

0926-3373 (ISSN) 1873-3883 (eISSN)

Vol. 31 1 1-12

Subject Categories

Inorganic Chemistry

Physical Chemistry

Chemical Engineering

Driving Forces

Sustainable development

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Energy

Materials Science

DOI

10.1016/S0926-3373(00)00267-8

More information

Created

10/7/2017