An aluminium-free Ti-Beta/SBA-15 composite material was prepared by the post-synthesis deposition of Ti-Beta nanoparticles solution on the SBA-15. The presence of crystalline nanoparticles in the impregnating solution was confirmed by HRTEM. The presence and the deposition of Ti-incorporated zeolitic nanoparticles on the mesopore walls of SBA-15 were proven by nitrogen sorption, IR and TG. The XAS spectroscopy of local environment of incorporated titanium showed that the product contained five fold coordinated framework titanium. These Ti sites can be oxidation titanium sites.
COBISS.SI-ID: 4066074
We present recent achievements in preparation and structure characterisation of transition Me-modified nanoporous silica- and phosphate-based materials for catalytic applications. Successful preparation and functionalisation of new materials using hydrothermal conventional and microwave procedures yielded Mn-, Fe- or Ti-containing micro- and mesoporous silicates and AlPOs, micro/mesoporous silicate composites with nanosized zeolitic particles and mesoporous aluminophosphate thin films. Structure-property relations using XRD, XAS, NMR, gas adsorption and EM characterisations are discussed.
COBISS.SI-ID: 4005914
The synthesis of monocarboaluminate starting was performed at 80 °C with synthesis times of 24 and 48 hours. Products were characterized by XRD,TG, IR and SEM. The differences in XRD and IR were small. Thermogravimetric curves revealed three or four dehydrationsteps of calcium monocarboaluminate indicating different water contents, depending on starting materials combination and, to a lesser extent, on synthesis conditions. The main effect on the formation of calcium monocarboaluminate from the above starting materials was a combination of aluminum source and limestone particle size.
COBISS.SI-ID: 4076058
We studied a novel method for the preparation of aluminosilicate-based ceramic materials by the thermal treatment of synthetic amorphous aluminosilicates. Amorphous aluminosilicates in the systems: Me2O-Al2O3-SiO2-H2O were prepared by two routes: By mixing Me-silicate- and Me-aluminate solutions and by preparing the ion exchanged Na2O-Al2O3-SiO2-H2O. Crystalline phases formed were characterized by XRD, IR, EDX, TG/DTG, SEM and TEM. Their structural and chemical properties and formation kinetics are discussed in terms of chemical compositions of precursors and the methods of their preparation.
COBISS.SI-ID: 3950106