MCM-41 as a support for small platinum particles: a catalyst for low-temperature carbon monoxide oxidation

Abstract

MCM-41 is loaded with platinum via different pathways, resulting in highly active oxidation catalysts

Homogeneously Dispersed Ceria Nanocatalyst Stabilized with Ordered Mesoporous Alumina

“…With ordered channels of 2-50 nm, mesoporous structured materials are very suitable for this purpose. Current methodologies for the assembly of metal or metal oxide nanoparticles in mesoporous materials include, for example, conventional incipient wetness impregnation, [6] post-grafting, [7] and metal-organic chemical vapor deposition. [8] Somorjai et al incorporated Pt nanocrystals into SBA-15 silica during hydrothermal synthesis.…”

Influence of Spatial Restrictions on Equilibrium Reactions: A Case Study about the Excimer Formation of Pyrene

“…[11][12][13] In general, those confinements are usually employed to confine the growth of nanoparticles, and there are only a few reports where these materials were used for other purposes. 14 The materials used so far were mostly of the MCM-type with its hexagonally aligned cylindrical pores. 15,16 Here, monolithic pieces of materials with the so-called "worm-type" pore system were employed which wesdue to their shorter pore lengthsregard as more suitable for confinement examinations (see Figure 1).…”

Pd/SiO2 catalysts: synthesis of Pd nanoparticles with the controlled size in mesoporous silicas

“…The metals were introduced into the support either directly during the mesoporous silicate synthesis, or by post-synthesis treatment. Direct incorporation was performed adding the metal precursor into the synthesis silica gel before ageing [34,37,45] or by a stabilisation of the metal precursor inside the template micelles during the self-assembly of the surfactant and silicate [30,32,47]. The post-synthesis metal deposition was carried out using a calcined mesoporous support via incipient wetness impregnation [35,39], ion-exchange [25][26][27]53], equilibrium adsorption, metal complex immobilisation [8,22], and vapour-phase grafting [23,31].…”

“…Work has been directed toward the synthesis of nanoparticles (nanowires) of the metals, such as palladium [20][21][22][23][24][25][26][27][28][29][30][31][32][33], platinum [8,20,[34][35][36][37][38][39][40], ruthenium [41][42][43][44][45][46][47], gold [48][49][50][51], silver [36,52], within the channels of mesoporous silicates, mainly, MCM-41. The metals were introduced into the support either directly during the mesoporous silicate synthesis, or by post-synthesis treatment.…”