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Monolithic FeOx/Al2O3 catalysts for ammonia oxidation and nitrous oxide decomposition
(1.2–8.3)%FeO х /Al 2 O 3 monolith catalysts have been prepared by impregnating alumina with aqueous solutions of iron(III) nitrate and oxalate and have been tested in NH 3 oxidation and in the selective decomposition of N 2 O in mixtures resulting from ammonia oxidation over a Pt–Rh gauze pack unde...
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| Published in: | Kinetics and catalysis 2017, Vol.58 (2), p.167-178 |
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| Main Authors: | , , |
| Format: | Article |
| Language: | English |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | (1.2–8.3)%FeO
х
/Al
2
O
3
monolith catalysts have been prepared by impregnating alumina with aqueous solutions of iron(III) nitrate and oxalate and have been tested in NH
3
oxidation and in the selective decomposition of N
2
O in mixtures resulting from ammonia oxidation over a Pt–Rh gauze pack under conditions of nitric acid synthesis (800–900°C). In the case of the support calcined at 1200°C, the catalyst is dominated by bulk Fe
2
O
3
particles localized on the Al
2
O
3
surface. The activity of these samples in both reactions decreases with a decreasing active component content, thus limiting the potential of Fe
2
(C
2
O
4
)
3
· 5H
2
O, an environmentally friendlier but poorly soluble compound, as a substitute for Fe(NO
3
)
3
· 9H
2
O. Decreasing the support calcination temperature to 1000°C or below leads to the formation of a highly defective Fe–Al–O solid solution in the (1.2–2.7)%FeO
х
/Al
2
O
3
catalysts. The surface layers of the solid solution are enriched with iron ions or stabilize ultrafine FeO
х
particles. The catalytic activity of these samples in both reactions is close to the activities measured for ~8%FeO
х
/Al
2
O
3
samples prepared using iron nitrate. |
|---|---|
| ISSN: | 0023-1584 1608-3210 |
| DOI: | 10.1134/S0023158417020100 |