Structure and reactivity in the selective oxidation of methane to formaldehyde of low-loaded FeOx/SiO2 catalysts

Carbon oxide hydrogenation over silica-supported iron-based catalysts

“…species display characteristic adsorption bands in the UV-vis spectra of low loading Fe/SiO 2 samples [35]. A band below 300 nm is characteristic of isolated Fe 3+ ions in an octahedral symmetry at the surface of silica particles.…”

Preparation and catalytic performance of Fe-SBA-15 and FeO x /SBA-15 for toluene combustion

“…Under the same experimental conditions, no reduction peaks were observed over the SBA-15 support (not shown here). The reduction behaviors of the xFe-SBA-15 and yFeO x /SBA-15 samples were rather similar to those of the FeO x /SiO 2 samples with low FeO x loadings [28]. The reduction peaks in the range of 50-750°C were assignable to the reduction of Fe 3?…”

“…species. It has been reported that a higher temperature is needed to reduce the highly dispersed Fe species on the mesporous molecular sieve-supported FeO x samples and the Fe-incorporated mesoporous materials [28][29][30]. As can be seen from the TPR profiles, the initial reduction temperature (326-341°C) of yFeO x /SBA-15 was lower than that (349-373°C) of xFe-SBA-15, indicating that xFe-SBA-15 exhibited better dispersion of Fe species than yFeO x /SBA- T 10% , T 50% and T 90% are the temperature for 10 %, 50 % and 90 % conversion of toluene 15 [12].…”

Catalytic selective oxidation or oxidative functionalization of methane and ethane to organic oxygenates

“…Kobayashi and co-workers [65,66] reported that the doping of a small amount of Fe 3+ (Fe/Si < 0.001) onto a kind of fumed silica by an impregnation method significantly enhanced the formation rate of HCHO. Arena and co-workers [10,67] disclosed that the FeO x /SiO 2 catalyst prepared by an adsorption-precipitation method was more effective for HCHO formation than that prepared by the conventional impregnation method due to the enhanced dispersion of iron species.…”