Selective catalytic reduction of N2O by C3H6 over Fe-ZSM-5

✍ Scribed by Kenji Yamada; Christian Pophal; Kohichi Segawa

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 582 KB
• Volume: 21
• Category: Article
• ISSN: 1387-1811
• DOI: 10.1016/s1387-1811(97)00063-2

✦ Synopsis

The direct decomposition and the selective reduction of nitrous oxide (N,O) over Fe-ZSM-5 has been investigated in the presence of water and oxygen, using propene (C,H,) as reductant. The results are compared with those obtained over Cu-ZSM-5, which is known to possess very high activity for the direct decomposition. When propene was added as reductant, Fe-ZSM-5 showed very high activity even in the low-temperature region and at low propene concentrations, whereas Cu-ZSM-5 was strongly deactivated. In the case of Fe-ZSM-5, no significant deactivation in the presence of water vapor or oxygen has been detected in the transient responses compared with the values of Cu-ZSM-5. Furthermore, in the case of Fe-ZSM-5, the oxidation of CJH, is directly correlated to the conversion of N20, indicating that the selective catalytic reduction is the preferred reaction. The reaction mechanism we can assume is as follows: first, C3H6 is adsorbed over a catalyst, and then N,O and 0, react with it. With regard to Fe-ZSM-5, N,O in the feed tends to react with absorbed C,H,.