Ni@SBA-15 monoliths with up to 5 wt.% of Ni were successfully synthetized by means of an original and easy one-pot sol-gel method. Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS), Temperature-Programmed Reduction (TPR), Pair Distribution Function (PDF) and X-Ray Diffraction (XRD) were used for the structural characterization of the samples. After H2-reduction, those solids exhibited small Ni 0 particles (between 1-3 nm) highly dispersed (one of the highest dispersion reported in the literature to date for 5 wt.% Ni/Silica materials) in strong interaction with the silica support. Scanning Transmission Electron Microscopy in the High Angle Annular Dark Field (STEM/HAADF) mode, chemical mapping by Energy Dispersive X-Ray (EDX) spectroscopy and electron tomography in STEM-HAADF mode highlighted the presence of Ni particles homogeneously distributed, especially in the mesopores. Such confined Ni nanoparticles were shown to be very selective and stable in the dry reforming of methane.

No abstract

No abstract

Well dispersed and efficient Rh(0) hydrogenation catalysts were obtained by the reduction of Rh(III)-exchanged mesoporous aluminosilicates by sodium borohydride in the presence of N,N-dimethyl-N-cetyl-N-(2-hydroxyethyl) ammonium chloride.

No abstract

No abstract

59-3 FIELD Section Title:Air Pollution and Industrial Hygiene 49, 51, 67 Faculte des sciences II, Laboratoire de Chimie Physique des Materiaux (LCPM), Campus Fanar, Universite Libanaise, Jdeideh, Lebanon. FIELD URL: written in EnglishSynthesis of some meso-structured SiO2 or aluminosilica (SBA-16 and Al-SBA-16) with a 3-dimensional cubic structure is reported. Structural and porosity properties of these materials were studied by x-ray diffraction, N2 sorption, and transmission electron microscopy imaging.; Al insertion was detd. by 27Al-MAS-NMR and acidic properties were characterized by pyridine adsorption followed by Fourier transform IR spectroscopy. These solids were tested for the selective catalytic redn. of NOx by ethanol in the presence of O2. Compared to hexagonal meso-porous SiO2 or aluminosilica (SBA-15 and Al-SBA-15), SBA-16 type materials (SBA-16 and Al-SBA-16) could be used as a potential catalyst for the oxidn. reaction; the SBA-16 solid had higher catalytic activity for NOx redn. to N2 at high temp. [on SciFinder(R)

No abstract