Bi-Co3O4 catalyzing N2O decomposition with strong resistance to CO2

• Bi as catalyst additive into Co3O4 significantly improves N2O decomposition.
• The catalytic activity of BixCo is almost not influenced by CO2 in the feed gas.
• Bi0.02Co is much more active than KxCo and CexCo in the presence of 10% CO2.
• Surface oxygen vacancies were proved to be the active sites by pulse reaction.

Bi added to Co3O4 by coprecipitation method significantly decreased the average crystalline size of Co3O4 and increased the surface area and the active sites of the catalyst in population for catalyzing the N2O decomposition. Over Bi0.02Co that was the optimized from the BixCo catalysts, 2000 ppm of N2O in pure Ar was completely decomposed at 400 °C in GHSV of 20,000 h− 1. Outstandingly, the catalyst exhibited a strong resistance to CO2, stable N2O conversion larger than 95% was obtained over the catalyst in the presence of 10% CO2 at the reaction temperature.

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