Preparation of Highly Active and Dispersed Platinum Nanoparticles on Mesoporous Al‐MCM‐48 and Their Activity in the Hydroisomerisation of n‐Octane

Abstract

Platinum nanoparticles supported on Al-MCM-48 materials have been prepared. The resultant catalysts have been characterized by means of XRD, N2 physisorption experiments, scanning electron microscopy (SEM), transmission electron microscopy (TEM), temperature-programmed reduction (TPR), and diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS). The activity of these nanoparticles has been tested in relation to the hydroisomerisation of n-octane. The catalytic activities were typically 50 %, with selectivities in the isomerisation process in excess of 70 %, favouring the formation of the 3-methylheptane isomer with respect to the 2- and 4-methylheptanes.

Efficient Microwave Oxidation of Alcohols Using Low‐Loaded Supported Metallic Iron Nanoparticles

“…Iron compounds are also abundant and biocompatible, playing a vital role in many biological systems, [9] and are becoming increasingly important in environmentally friendly catalytic protocols. [10] With regards to catalysis, supported MNPs display a large surface to volume ratio as compared to their bulk metal analogues which makes them attractive candidates as catalysts for a wide range of reactions including hydroisomerisations, [7] hydrogenations, [11] CÀC coupling [5,6,12] and oxidations. [13,14] The oxidation of alcohols to carbonyl compounds is one of the key transformations in synthetic organic chemistry.…”

“…[4] We have recently reported various protocols for the preparation of supported metallic nanoparticles on a range of supports such as metal oxides, [5] biopolymers [6] and mesoporous materials. [7,8] Different approaches were investigated including impregnation, co-precipitation, sonication and microwave-assisted synthesis to achieve an understanding of the formation and the control of the sizes and shapes of the nanoparticles. In particular, the microwave-assisted synthesis was found to overcome inherent drawbacks of the unsupported nanoparticles with regards to stability, agglomeration and reusability as well as the use of reductants, allowing an efficient and greener method to obtain highly active and well-dispersed supported MNPs (Au, Ag, Pd and Ru).…”

Continuous-Flow Hydroisomerization of C5–C7 Alkanes Using Mechanochemically Synthesized Supported Pt and Pd-SBA-15 Materials

“…The best results were obtained at 300°C (Figure 2). Similarly, loaded materials (e.g., 1%Pd/Al-SBA-15), on the other hand, exhibited higher selectivities towards hydrocracking (particularly at increased temperatures, Table 4) [33].…”

Sustainable Preparation of Supported Metal Nanoparticles and Their Applications in Catalysis

“…We recently reported the preparation of Pt nanoparticles on the mesoporous aluminosilicate MCM-48. [46] The Pt metal nanoparticles were highly dispersed on the support with a very narrow (4-6 nm) particle size. Materials with low Pt loading (typically 0.5 %; Figure 9 A) were found to be highly active in the hydroisomerisation of n-octane.…”

“…TEM images of Pt/Al-MCM-48 materials with different Pt loadings prepared by the traditional impregnation/reduction method: A) 0.5 wt % Pt; B) 1 wt % Pt; C) 3 wt % Pt; D) 5 wt % Pt. [46] Reproduced with permission. www.chemsuschem.org use of a reductant including sodium borohydride, [62] hydrogen [39] and hydrogen/polyalcohols, [60][61][62][63] to further ensure the reduction of the nanoparticle on the support.…”