One-step-impregnation hard templating synthesis of high-surface-area nanostructured mixed metal oxides (NiFe2O4, CuFe2O4 and Cu/CeO2)

Abstract

We report here on an efficient one-step-impregnation method to synthesize crystalline mesoporous bimetal oxides (e.g. NiFe(2)O(4), CuFe(2)O(4), Cu/CeO(2)) using mesoporous silicas as hard templates under optimized mixing conditions. This new procedure enables a true replication of the mesostructure with high yield and phase purity, while retaining particle morphology of the template.

Designed synthesis and formation mechanism of CeO2hollow nanospheres and their facile functionalization with Au nanoparticles

“…9c can be fitted in two components: The first BE peak centre at 529.1 eV is assigned to the lattice oxygen in the CeO 2 structures, while the second one 15 at a higher binding energy at 531.1eV could be associated to the absorption oxygen on the surface. [41][42] The spectrum of Au 4f was also investigated. As can be seen in Fig.…”

Templating synthesis of metal oxides by an incipient wetness impregnation route and their activities for CO oxidation

“…[8][9][10][11][12][13] In this method, soluble metal salts are used as precursors and their permeation to the pores of the template is a crucial step. [20][21][22][23] On the other hand, strict legislations on environmental protection issued in recent decades impel the scientists to find solutions for removing pollutants emitted to the environment. 11,14,15 To simplify the impregnation process while achieving high yields, various strategies were developed, such as the ''bisolvent'' impregnation method in which a co-solvent is used to improve the accessibility of metal nitrates to the pores of the template, 16,17 and the solid-liquid method in which the metal precursor was heated to its melting temperature and then entered the pores of the template by a capillary action.…”

Formation of Hierarchically Porous Metal Oxide and Metal Monoliths by Nanocasting into Silica Monoliths

“…For monoliths, capillary forces will favor filling of the mesopores over the macropores, and so by adding a volume of solution that matches the volume of the mesopores, infiltration of solution can be limited to the mesopores. This process has recently been applied by a number of groups to nanocasting into mesoporous silica particles, [55][56][57] and we have also successfully applied it to nanocasting into silica monoliths. A variation on this approach is to use a solution which is not saturated and then let evaporation concentrate the precursors into the mesopores since evaporation will occur preferentially from the macropores.…”

“…The interest here is primarily in magnetic materials such as (1) ferrites: MFe 2 O 4 where M ¼ zinc, [62] manganese, [63] nickel, [57,63,64] cobalt, [63][64][65][66] copper, [57,63] and magnesium, [64] (2) strontium hexaferrite, [67] (3) NiCo 2 O 4 spinel, [68,69] and (4) copper doped cerium oxide [57] for solid oxide fuel cell applications. The interest here is primarily in magnetic materials such as (1) ferrites: MFe 2 O 4 where M ¼ zinc, [62] manganese, [63] nickel, [57,63,64] cobalt, [63][64][65][66] copper, [57,63] and magnesium, [64] (2) strontium hexaferrite, [67] (3) NiCo 2 O 4 spinel, [68,69] and (4) copper doped cerium oxide [57] for solid oxide fuel cell applications.…”