(202c) Thermal and Crystalline Stability of Silica-Tungsta/Titania Particles Made by Flame Spray Pyrolysis
AIChE Spring Meeting and Global Congress on Process Safety
2006 Spring Meeting & 2nd Global Congress on Process Safety
Fifth World Congress on Particle Technology
Gas-Phase Nanoparticle Synthesis - I
Wednesday, April 26, 2006 - 1:40pm to 2:00pm
The effect of doping with silica flame-made WO3/TiO2 powders (anatase, 100 m2/g) on their specific surface area, crystallinity and catalytic activity was investigated. The silica content was 0-5 wt% while tungsta was constant at 10 wt%. The structural and chemical properties of these nanosized powders were analyzed by nitrogen adsorption (BET), X-ray diffraction (XRD), temperature programmed reduction (TPR), transmission electron microscopy (TEM) and Raman spectroscopy. The thermal and crystal stability was improved by adding up to 5 wt% silica. After calcination for 20 hours at 700°C in air, the thermally most stable powder conserved a SSA of 90 m2/g and 96 wt% of the anatase. Tungsta form thin polymeric layers (~1 nm) on the surface of the titania support.
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