Effect of the addition of SBA-15 in the pyrolysis of a reference tobacco under inert and oxidizing atmosphere
The composition of evolved products from slow pyrolysis under inert and oxidizing atmospheres of a reference tobacco 3R4F from the Reference Cigarette Program of the College of Agriculture of the University of Kentucky and a mixture of the reference tobacco with a mesoporous catalyst SBA-15, with a fibre-like morphology, have been measured by using a multi-shot pyrolyzer, which was attached directly to a gas chromatography/mass spectrometry. The results obtained show that under inert atmosphere, the main decomposition rate occurs between 200-400 ºC with the generation of compounds characteristic of the decomposition of cellulose, hemicellulose, lignin and the generation of nicotine. The addition of SBA-15 to tobacco produces at a temperature below 300 ºC a general reduction of evolved gases, specifically decreasing in a greater proportion the formation of quinic acid, neophytadiene and nicotyrine. In contrast, at temperatures above 300 °C the opposite effect occurs and the generation of compound is greater, increasing the formation of acetaldehyde, chloromethane and aromatics. Under oxidizing atmosphere, at temperatures below 300 ºC, almost all compounds are reduced by adding SBA-15 to tobacco, such as glycerol, neophytadiene or nicotine. The combustion processes occur between 400-500 ºC with the generation of mainly CO2 and H2O and at temperatures above 300 ºC there is also a great reduction on the evolved gases like acid acetic, acetonitrile and aromatics.