Oxidative Destruction of Hydrocarbons on Ca12Al14-xSixO33+0.5x (0 ≤ x ≤ 4) with Radical Oxygen Occluded in Nanopores

Abstract

SiO 4 ) 0.8 (OH) 8.8 . Different amounts of superoxide (O À 2 ) and peroxide (O 2À 2 ) were occluded in the lattice of these calcium aluminosilicates. No activity improvement was observed for the oxidation of propylene and benzene by increasing the amounts of O À 2 and O 2À 2 .

Formation of brownmillerite type calcium ferrite (Ca2Fe2O5) and catalytic properties in propylene combustion

“…Molecular O 2 species has been assigned to a band at ca. 1556 cm )1 ; the superoxide radical (O 2 ) ) is observed to have a stretching vibration frequency at 1180 cm )1 on TiO 2 [18] and at 1160-1015 cm )1 on MgO-CoO [19,20], mayenite type aluminum silicate [21][22][23] has been typically found an absorption in a broad range (640-970 cm )1 ). Spectra at Ca/Fe = 0.50; (a) also exhibited two weak sifts at 1022 and 1092 cm )1 , however the former shift was less definitive.…”

Electrical properties of Ca12Al14O33synthesised through polymer assisted deposition and glass crystallization routes

“…The results showed a great enhancement in conductivity for the solution method prepared sample due to the better sinterability and densication. As in a similar hydrothermal synthesis, S. Fujita et al 39 prepared Si-substituted mayenite Ca 12 Al 14Àx Si x O 33+0.5x with the high solid solution of 0 # x # 4. Although these Sisubstituted materials are stable only below 600 C and without oxide ion conductivities being reported, it gave us a hint that the low doping level as reported in previous works may be remarkably improved by a new synthesis method.…”

Reforming of tar contained in a raw fuel gas from biomass gasification using nickel-mayenite catalyst

“…3 i n t e r n a t i o n a l j o u r n a l o f h y d r o g e n e n e r g y 4 0 ( 2 0 1 5 ) 9 0 8 8 e9 0 9 5 deactivation of the catalyst, followed by a successive stabilization, was noticed in the early stage of tar/syngas reforming. Mayenite (Ca 12 Al 14 O 33 ) was previously developed and used by Fujita et al [29,30] as an alternate catalyst. It proved to have high performance on hydrocarbon catalytic combustion because of the oxidation ability of the "free" oxide anions O 2 À and O 2 2À that are generated on the surface of the solid catalyst.…”