Low temperature CO oxidation over iron-containing MCM-41 catalysts

Abstract

Different MCM-41 samples containing framework iron were prepared and tested in CO oxidation showing unprecedented high activities after reduction in hydrogen above 773 K.

Ordered mesoporous aluminosilicates with very low Si/Al ratio and stable tetrahedral aluminum sites for catalysis

“…The synthesis of mesoporous (2-50 nm) silicas M41S in 1992 using a supramolecular surfactant system as a template provoked a great ''Boom'' in the field of nanoporous materials [1][2][3][4][5][6][7]. In particular, a special attention has been devoted to develop mesostructured aluminosilicates since aluminosilicate is one of important chemical compositions in catalysis and separation processes of high molecular weight petroleum fractions [1,2].…”

The role of the nano-environment of supported gold catalysts in the activity control. Modification of Au/Al2O3 catalysts by redox-type metal oxides

“…The net result of this interaction is a perturbation of the CO molecule leading to its high reactivity even at low temperatures. This concept has been recently extended to the Fe-MCM41 type catalyst, which showed high activity in low temperature CO oxidation after its reduction in hydrogen above 500 o C [15].…”

Dehydrogenation of Cyclohexanol on Fe, Ti-MCM-41 Mesoporous Materials

“…However, the preparation of stable, modified materials by conventional hydrothermal synthesis is usually possible at low metal loading, which strongly restricts the application as catalysts. It has been recently reported that the sol-gel technique reveals much higher ability in this aspect, and the preparation of stable metal modified MCM-41 materials were obtained [12,13,17].…”

“…It has been established, that the applied method of modification strongly influences the state (localization, dispersion and oxidative state) of the loaded metal species [12][13][14][15]. Their introduction in the host matrix could be realized during the silica synthesis procedure as well as by various postsynthesis techniques (impregnation, grafting) [12][13][14][15][16]. However, the preparation of stable, modified materials by conventional hydrothermal synthesis is usually possible at low metal loading, which strongly restricts the application as catalysts.…”

“…has been introduced into the silica matrix to obtain materials with tunable catalytic properties [9][10][11]. It has been established, that the applied method of modification strongly influences the state (localization, dispersion and oxidative state) of the loaded metal species [12][13][14][15]. Their introduction in the host matrix could be realized during the silica synthesis procedure as well as by various postsynthesis techniques (impregnation, grafting) [12][13][14][15][16].…”