Microwave-assisted catalytic decomposition of N2O over hexaferrites

To explore a new class of material (X-type hexaferrites) for N2O decomposition

“…The basic ternary system for hexaferrites is BaO-MeO-Fe 2 O 3 , which stabilizes itself in different ratios and forms six different types of subclasses, such as Ba 2 M 2 Fe 12 1 Here, M represents a divalent cation such as Fe 2+ , Co 2+ , Mn 2+ , Ni 2+ , Zn 2+ or a combination of these. The basic ternary system for hexaferrites is BaO-MeO-Fe 2 O 3 , which stabilizes itself in different ratios and forms six different types of subclasses, such as Ba 2 M 2 Fe 12 1 Here, M represents a divalent cation such as Fe 2+ , Co 2+ , Mn 2+ , Ni 2+ , Zn 2+ or a combination of these.…”

“…7 As the reaction is highly exothermic, the stability of the catalyst is the main challenge. 12 In the case of X-type hexaferrites, there are three octahedral sites located at the border between the R and S blocks and the S-S block. Similar results were obtained for zeolites, spinels and noble metal systems.…”

Catalytic decomposition of N2O on cobalt substituted barium hexaferrites

“…We reported previously that Al substituted Ba2Mg2Fe12-xAlxO22 cat-alysts exhibited desired N2O decomposition activity. Especially under microwave heating mode [13], the complete decomposition of N2O was obtained at 583 K without the use of expensive noble metals. However, their catalytic activity under conventional heating mode is still poor.…”

Improved structural and catalytic attributes of Ba2Co2Fe12−2x(Zr,Ni)xO22 materials synthesized by sol–gel and microwave heating methods

“…3 Recently, the catalytic activity of Y-type hexaferrites for N 2 O decomposition has been reported for the first time. 4 Many conventional methods are used for the synthesis of hexaferrites like sol-gel, 5 co-precipitation, 6 microemulsion, 7 solid state reaction, 8 ceramic routes 9 and hydrothermal synthesis.…”

“…42 Iron distributed in the octahedral sites induces the conduction mechanism in ferrites as well as contributing to the catalytic activity. 4 There is an intrinsic conduction taking place between Fe 2+ and Fe 3+ . The Zr 4+ has a tetrahedral site preference and Ni 2+ prefer to occupy the octahedral site.…”