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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)

Peter Thormählen (Institutionen för teknisk fysik, Kemisk fysik ; Kompetenscentrum katalys (KCK)) ; Erik Fridell (Institutionen för teknisk fysik, Kemisk fysik ; Kompetenscentrum katalys (KCK)) ; Neil Cruise (Institutionen för teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Magnus Skoglundh (Institutionen för teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Anders Palmqvist (Institutionen för teknisk ytkemi ; Kompetenscentrum katalys (KCK))
Applied Catalysis B: Environmental (0926-3373). Vol. 31 (2001), 1, p. 1-12.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: catalytic oxidation of carbon monoxide; low-temperature activity; cold start emissions; catalyst pre-treatment; CO-TPD; BET; SEM; XRD; XPS; cobalt-aluminate; CO; CO2; H-2; C2H6; NOx; H2O; SO2



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Denna post skapades 2011-01-15. Senast ändrad 2017-09-14.
CPL Pubid: 134029

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kemisk fysik (1900-2015)
Kompetenscentrum katalys (KCK)
Institutionen för teknisk ytkemi (1999-2003)

Ämnesområden

Energi
Materialvetenskap
Nanovetenskap och nanoteknik
Hållbar utveckling
Kemisk fysik
Oorganisk kemi
Kemiteknik

Chalmers infrastruktur

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