التفاصيل البيبلوغرافية
| العنوان: |
Decomposition of N2O over Hexaaluminate Catalysts. |
| المؤلفون: |
Santiago, Marta1, Perez-Ramirez, Javier1,2 jperez@iciq.es |
| المصدر: |
Environmental Science & Technology. 3/1/2007, Vol. 41 Issue 5, p1704-1709. 6p. 3 Black and White Photographs, 1 Diagram, 1 Chart, 8 Graphs. |
| مصطلحات موضوعية: |
CATALYSTS, CHEMICAL decomposition, CARBONATES, TRANSMISSION electron microscopy, ADSORPTION (Chemistry), OXIDATION, NUCLEAR reactors, GREENHOUSE gases, CATALYSIS |
| مستخلص: |
Catalytic N2O decomposition has been studied over metal-substituted hexaaluminates with the general formula ABAI11O19, where A = La, Ba, and B = Mn, Fe, Ni. The materials were prepared by coprecipitation via the carbonate route followed by calcination at 1473 K for 10 h. Inductively coupled plasma optical emission spectroscopy (ICP-OES), X-ray diffraction (XRD), transmission electron microscopy (TEM), and N2 adsorption techniques were used to characterize the catalysts. The activity in direct N2O decomposition was evaluated by means of temperature-programmed reaction and steady-state experiments. Fe- and Mn-containing hexaaluminates present the highest activities. The Ni-containing catalysts are significantly less active, comparable to the hexaaluminates without metal substitution. The catalytic activity was practically not influenced by the A cation (La or Ba) in the structure. The Fe- and Mn-substituted hexaaluminates exhibit high activity and stability for N2O decomposition in mixtures simulating the outlet of the Pt-Rh gauzes in ammonia oxidation reactors, containing N2O, NO, O2, and H2O. These materials are promising for high-temperature abatement of this powerful greenhouse gas in the chemical industry, particularly in nitric acid and caprolactam production. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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