Influence of the time of and stirring rate during the first step of synthesis of SBA-15 on its catalytic effect for reducing toxicants concentration in tobacco smoke
Certain mesoporous materials can modify notably the composition of smoke tobacco, since they can act as catalysts and/or adsorbents allowing to reduce the toxic and carcinogenic compounds of the smoke. However, the properties of the catalysts strongly depend on the synthesis conditions affecting their final possible. The main objective of this work is to study the influence of the time and the stirring rate during the first stage of the synthesis on the structure of the SBA-15, and determine the effect of these materials in reducing toxicants of tobacco smoke. The synthesis procedure was based on the method of Zhao modifying the time and the stirring rate of the first synthesis step. Materials were characterized by X-ray powder diffraction (XRD), nitrogen adsorption isotherms, scanning electron microscopy (SEM) and apparent density. The smoking experiments were performed under ISO3308 conditions using 3R4F tobacco, and the mixtures were prepared adding 4,8 % of SBA-15. The composition of the gas fraction and the total particular matter (TMP) were quantified using GC-FID e GC-MS techniques, respectively. Increasing the time, relevant improvements could be observed in the properties of the materials with significant effects in their activity for reducing the toxic compounds in smoke experiments. Contrarily, increasing the stirring rate adversely affect the porous properties as and its performance in smoking experiments. Short fibres were obtained at the highest stirring rate tested.