Effect of SBA-15 morphology on the thermal decomposition of nicotine
Nicotine is the most abundant alkaloid both in tobacco and tobacco smoke, main responsible of the addictive character of tobacco. SBA-15 is a mesoporous silicate that has proven to be very effective in reducing tars and nicotine from tobacco smoke when added to tobacco under smoking conditions. The present work presents preliminary results on the thermal degradation, using a pyrolizer (Py/EGA-GC/MS) online with a gas chromatographer coupled with mass selective detector, of nicotine under different conditions (atmospheres and temperatures), and in the presence of two SBA-15 catalysts of different morphologies. The two SBA-15 mesoporous catalysts with fibre like and platelets morphologies, were synthetized in our laboratory and characterized by N2 adsorption isotherms, scanning electron micrographs (SEM) and transmission electron micrographs (TEM) and X-ray diffraction. Nicotine decomposes at lower temperatures under inert atmosphere than in air. The presence of fibre like SBA-15 slightly modifies the thermal decomposition of nicotine under inert atmosphere. Nevertheless, the platelet shaped SBA-15 strongly affects the thermal behaviour nicotine favouring its decomposition, occurring at lower temperatures with high yield of compound such as quinolone and 2-methyl-1H-Indole, among others. Under oxidative atmosphere, both catalysts have a less marked effect on the thermal degradation of nicotine.