Abstract
MCM‐41 have been used to custom synthesize catalysts in because of the controllable properties, such as pore size, active phase incorporation, crystal size, and morphology, among others. In this paper, a simple and versatile method for the incorporation of platinum, ruthenium, and palladium onto Al‐MCM‐41 mesoporous silica by direct inclusion of various precursors was studied. M/Al‐MCM‐41 structure, textural properties, morphology, and elemental composition were analyzed. The results obtained indicate that the Al‐MCM‐41 mesoporous‐ordered structure was not affected by metallic particle incorporation. High‐surface areas were obtained (1131 m2/g). Metallic nanoparticles dispersion on Al‐MCM‐41 was homogeneous for all samples and its particles sizes were between 6 nm to 20 nm. Microscopy results show round shape particles in platinum and palladium samples; however, ruthenium catalysts exhibit a spherical and rod shapes. Electrochemical testing for Pt/Al‐MCM‐41 showed electrocatalytic activity for H2 oxidation which indicates that these materials can be used as a catalyst in electrochemical devices.
Highlights
Mesoporous materials have played an important role in catalytic applications [1,2,3]
In order to have an approximation of the elemental composition and metal loading in M/Al-MCM-41 samples, energy dispersive spectroscopy (EDS) was carried out with EDAX Prime equipment coupled to a JEOL 5800 LV Scanning Electron Microscope; the analyses were randomly taken in several sample zones to have a representative value of the elemental composition at low magnification
The results showed above suggest that most metallic particles are supported outside of the Al-MCM-41 pores because of the calculated d spacing is smaller than metallic particle size derived from Scherrer equation
Summary
Mesoporous materials have played an important role in catalytic applications [1,2,3]. Custom synthesizing mesoporous materials by incorporating metallic particles is an important issue for the development of catalytic applications [4]. The M41S family has three members: MCM-41 with a hexagonal array of unidirectional pores, MCM-48 with a three-dimensional cubic pore structure, and MCM-50 with an unstable lamellar structure These materials have exceptionally high-surface areas (>1000 m2/g) and narrow pore size distributions [6]. Preparation methods to support metals on mesoporous materials are complicated and involve several steps in order to produce nanoparticles. Different synthesis methods have been developed for depositing metallic particles into mesoporous supports. The nanometric size of the Pt-particles (around 2 nm) promoted high conversions in CO oxidation Other mesoporous materials such as MSU (Michigan State University material) have been evaluated in some catalytic applications. The physical, chemical, and electrochemical properties of the synthesized materials are discussed
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