Effect of Hydrogen Treatment on the Catalytic Activity of Iron Oxide Based Materials Dispersed Over Activated Carbon: Investigations Toward Hydrogen Peroxide Decomposition

Abstract

The effect of hydrogen treatment (400°C/1 h) on the catalytic properties toward H 2 O 2 decomposition of iron oxide based materials dispersed over activated carbon were investigated. Two different supports were evaluated: a commercial activated carbon (ACM) and an activated carbon produced from spent coffee grounds (ACR). The catalysts were characterized using XRD, SEM, N 2 -sorption, XPS and TPR analysis. The main results suggest the formation of composites with high surface area ([800 m 2 g -1 ) and the hydrogen treatment resulted in a great increase in the catalytic activity, probably as a function of the reduced iron species (Fe 2? and Fe 0 ) formed with the treatment. Moreover, the catalyst prepared with ACR showed to be more active than that prepared from ACM.

Three-dimensionally ordered and wormhole-like mesoporous iron oxide catalysts highly active for the oxidation of acetone and methanol

“…As shown in Fig. 5A, the asymmetrical Fe 2p 3/2 XPS peak of each catalyst could be decomposed to two components at BE = 710.0-710.4 and 711.3-711.9 eV, ascribable to the Fe 2+ and Fe 3+ signals [21,[23][24][25], respectively. From Fig.…”

“…It is known that the reduction of iron oxide proceeds at elevated temperatures according to the sequence of˛-Fe 2 O 3 → Fe 3 O 4 → Fe 0 [23]. Fig.…”

Estimation of surface area and pore volume of activated carbons by methylene blue and iodine numbers

“…The literature data were obtained from activated carbons produced from olive-waste cakes, 5 tree seed husks, 8 bituminous coal, wood, 9 Eucalyptus bark, 10 rubberwood sawdust, 11 waste newsprint, 12 sugarcane bagasse, 13,14 babassu, coconut shells, 14 sugarcane residues, 7 olive stones, 15 petroleum pitch, 16 shells and fruit pits, 17,18 fruit seeds 18 and knitted fabrics, 19 besides commercial activated carbon. 20 The experimental data were obtained using activated carbons produced in our laboratory from spent coffee grounds, 21 bean husks 22 and a commercial sample.…”

Nb-doped hematite: Highly active catalyst for the oxidation of organic dyes in water

“…the splitting of water into molecular H 2 and O 2 [1]. Another example of the use of iron oxides are in oxidation reactions that are activated by hydrogen peroxide [2][3][4]. Studies have shown environmental applications for iron oxides and the possibility of introducing other chemical elements in the crystal lattice as a means to activate advanced oxidation processes [5] or even to develop new surfaces that improve the dispersion of the active centers [6].…”