Catalytic conversion of N2O to N2 over metal-based catalysts in the presence of hydrocarbons and oxygen

The catalytic conversion of N2O to N2 in the presence or the absence of propene and oxygen was studied. The catalysts examined in this work were synthesized impregnating metals (Rh, Ru, Pd, Co, Cu, Fe, In) on different supports (Al2O3, SiO2, TiO2, ZrO2 and calcined hydrotalcite MgAl2(OH)8·H2O). The...

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Bibliographic Details
Published in:Catalysis letters 2002-04, Vol.79 (1-4), p.137-147
Main Authors: CHRISTOFOROU, S. C, EFTHIMIADIS, E. A, VASALOS, I. A
Format: Article
Language:English
Subjects:
Aluminum oxide
Catalysis
Catalysts
Catalytic converters
Catalytic reactions
Chemisorption
Chemistry
Conversion
Copper
Exact sciences and technology
General and physical chemistry
Hydrocarbons
Impregnation
Iron
Nitrous oxide
Organic chemistry
Palladium
Reducing agents
Rhodium
Ruthenium
Silicon dioxide
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Titanium dioxide
Transitional aluminas
Zirconium dioxide
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Summary:The catalytic conversion of N2O to N2 in the presence or the absence of propene and oxygen was studied. The catalysts examined in this work were synthesized impregnating metals (Rh, Ru, Pd, Co, Cu, Fe, In) on different supports (Al2O3, SiO2, TiO2, ZrO2 and calcined hydrotalcite MgAl2(OH)8·H2O). The experimental results varied both with the type of the active site and with the type of the support. Rh and Ru impregnated on γ-alumina exhibited the highest activity. The performance of the above most promising catalysts was studied using various hydrocarbons (CH4, C3H6, C3H8) as reducing agents. These experimental results showed that the type of reducing agent does not affect the reaction yield. The temperature where complete conversion of N2O to N2 was measured was independent of the reductant type. The activity of the most active catalysts was also measured in the presence of SO2 and H2O in the feed. A shift of the N2O conversion versus temperature curve to higher temperatures was observed when SO2 and H2O were added, separately or simultaneously, to the feed. The inhibition caused by SO2 was attributed to the formation of sulfates and that caused by water to the competitive chemisorption of H2O and N2O on the same active sites.
ISSN:1011-372X
1572-879X
DOI:10.1023/A:1015360425678