Catalytic decomposition of N2O on cobalt substituted barium hexaferrites

doi:10.1016/S1872-2067(12)60587-7

Abstract

Abstract: Catalytic decomposition of N₂O was studied over Co substituted Mg-Y type hexaferrites (Ba₂Mg_2-xCo_xFe₁₂O₂₂, x = 0.4-2.0). The materials were synthesized by a sol-gel method using citric acid as the chelator followed by calcination at 1223 K for 5 h. X-ray diffraction, thermogravimetric analysis/derivative thermogravimetric, scanning electron microscopy, and N₂ adsorption techniques were used to confirm the formation of hexaferrite. The Ba₂Mg_2-xCo_xFe₁₂O₂₂ catalysts displayed good activity for decomposition of high concentration N₂O (30 vol%), and complete substitution of Mg for Co lowered the complete conversion temperature from 1123 K to 973 K. Increasing calcination temperature suppressed the catalytic activity by deteriorating surface area. Moreover, coupling microwave discharge significantly boosted the catalytic activity. Co substituted Mg-Y type hexaferrites are potentially active and thermally stable to be used as catalyst for high concentration N₂O decomposition.

Key words: Nitrous oxide, Decomposition, Hexaferrite, Ba₂Mg₂Fe₁₂O_22, Cobalt, Microwave

Barkat UL-AIN, Safeer AHMED, HUANG Yanqiang. Catalytic decomposition of N₂O on cobalt substituted barium hexaferrites[J]. Chinese Journal of Catalysis, DOI: 10.1016/S1872-2067(12)60587-7.

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Catalytic decomposition of N₂O on cobalt substituted barium hexaferrites

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