Accessible Unlicensed Requires Authentication Published by De Gruyter August 22, 2013

Direct Decomposition of N2O Emitted from Nitric Acid Plant Tail Gases Using Noble Metal Supported Mordenite-Zeolite Catalysts∗

Direkter Abbau des N2O-Ausstosses in Salpertersäurefabriken mittels Edelmetall-unterstützter Mordenit-Zeolit-Katalysatoren
Byung-Chan Kwon, Sung-Su Cho, Minhye Seo, Sungkyu Lee and Jinho Song
From the journal Materials Testing

Abstract

Mordenite based catalysts for direct decomposition of N2O have been successfully prepared and their direct decomposition performance characterized at the operating temperature of 300–400 °C commonly encountered in the nitric acid plants tail gases. The catalyst was prepared in 2 steps: 1. Precursor wet ion exchange, 2. Precursor impregnation. In addition to the previous contribution, it is shown here that the bimetallic Rh-, Pd-, Ir-Fe-MOR catalysts thus prepared exhibited an excellent N2O decomposition performance: total conversion efficiency of Rh-Fe-MOR catalyst has been achieved at 400 °C and between 7500 h−1 and 10 000 h−1 space velocity.

Abstract

Mordenit-basierte Katalysatoren für den direkten Abbau von N2O wurden erfolgreich hergestellt und ihre Direktabbau-Fähigkeit wurde für Betriebstemperaturen zwischen 300–400 °C, die üblicherweise bei den Ausstoßgasen von Salpetersäurefabriken herrschen, charakterisiert. Der Katalysator wurde in zwei Schritten hergestellt: 1. Precursor-Nass-Ionenaustausch, 2. Precursor-Imprägnierung. In Ergänzung zum vorhergehenden Beitrag wird hier dargestellt, dass die so hergestellten bimetallischen Rh-, Pd-, Ir-Fe-MOR Katalysatoren eine exzellente Abbaufähigkeit hinsichtlich des N2O-Abbaus zeigten: Die totale Konversion ergab sich bei 400 °C und einer Raumgeschwindigkeit zwischen 7500 h−1 und 10 000 h−1.


Work leading to this manuscript was performed at Institute for Advanced Engineering (IAE) and all of the legal claims for the research belongs to IAE.


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Published Online: 2013-08-22
Published in Print: 2013-04-02

© 2013, Carl Hanser Verlag, München