Catalytic reduction of nitrous oxide with carbon monoxide over calcined Co–Mn–Al hydrotalcite
✍ Scribed by K. Pacultová; L. Obalová; F. Kovanda; K. Jirátová
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 397 KB
- Volume
- 137
- Category
- Article
- ISSN
- 0920-5861
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✦ Synopsis
The N 2 O catalytic reduction by carbon monoxide over Co-Mn-Al calcined hydrotalcite was studied. The effect of oxygen and that of CO/N 2 O molar ratio on the rate of N 2 O decomposition was examined. CO strongly enhanced N 2 O conversion when O 2 was absent in the feed gas. In the presence of oxygen, carbon monoxide acts as a non-selective reductant thereby inhibiting N 2 O destruction. Continuing excess of CO over N 2 O without presence of O 2 led to a very slow reduction of the catalyst, which caused noticeable N 2 O conversion decrease with progressing catalyst reduction. The simultaneous reduction of N 2 O by CO and direct N 2 O decomposition took place when CO was limiting reactant (CO/N 2 O < 1) but only at temperatures, at which the direct decomposition is possible without presence of reductant. Simple reduction was observed when reactants ratio was CO/N 2 O ! 1.