Transient Studies of Direct N₂O Decomposition over Pt–Rh Gauze Catalyst. Mechanistic and Kinetic Aspects of Oxygen Formation

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• 作者：Kondratenko ; Evgueni V. ; P&eacute ; rez Ramí ; rez ; Javier
• 关键词：N2O decomposition ; platinum ; rhodium ; gauze ; mechanism ; kinetics ; transient experiments ; TAP ; isotope
• 刊名：Catalysis Letters
• 出版年：2003
• 出版时间：2003
• 年：2003
• 卷：91
• 期：3/4
• 页码：211-216
• 全文大小：186 KB

文摘

For elucidating the mechanistic aspects of oxygen formation during N₂O decomposition over commercial woven Pt–Rh gauze, transient experiments were carried out in the temporal analysis of products (TAP) reactor by pulsing N₂p>16p>O over p>18p>O-pretreated gauze catalyst at temperatures typical of industrial ammonia burners (1073–1273 K). The transient responses of N₂O and the products of its decomposition (O₂ and N₂) were fitted to two different mechanistic models. From the isotopic studies and the fitting of transient experiments, two separate routes of oxygen formation during catalytic N₂O decomposition have been identified. Oxygen is produced via both (i) interaction of N₂O with adsorbed oxygen species formed from N₂O and (ii) recombination of adsorbed oxygen species on the catalyst surface. The relative contribution of these reaction pathways depends on the reaction temperature.p>