Research On Catalytic Combustion Of Methyl Chloride Over Mesoporous Molecular Sieve Catalysts

CVOCs (Chlorinated volatile organic compounds) are important kinds of substances in volatile organic compounds (VOCs). There are about two kinds of CVOCs:small organic molecule chloride, high polymer chloride. Methyl chloride is small organic molecule chloride. It is a kind of colorless poisonous combustible gas at room temperature and pressure. If it is emitted into air, it will cause air pollution, potential safety hazard and it will do harm to human health. At present, catalytic combustion is an effective and economical way to remove the pollution of methyl chloride. The key of catalytic combustion is to find catalysts with good properties.In this research project, in situ synthesis method is used to synthesize (Fe, Ce, Co, Mn)/(SBA-15, KIT-6) and (Fe, Ce, Co, Mn)/(AlCl3, C9H21AlO3, A1(SO4)3·18H2O)/(SBA-15, SBA-16), different kinds of transition metals supported catalysts are prepared by incipient wetness impregnation method. In order to choose the best catalyst, catalytic activity of the prepared catalysts is investigated with CH3Cl chosen as a probe of CVOCs via IR. The characteristics of the prepared catalysts are study by XRD, H2-TPR, BET, TEM, XPS analytic techniques. The relations between the characteristics of the prepared and catalytic activity of the prepared catalysts are also discussed in this paper. Researching on mechanism of Fe/SBA-16 through DRIFTS is done at the same time.The results show that considering CH3C1 conversion rate and good selectivity of products, Fe/SBA-15 is the best catalyst in M(M=Fe, Ce, Co, Mn)/(SBA-15, KIT-6) and Co/A1C13-SBA-15 is the best catalyst in M (M=Fe, Ce, Co, Mn)/(AlCl3, C9H21AlO3, Al(SO4)3·18H2O)/(SBA-15, SBA-16). In general, with two dimensional porous structure of SBA-15 is much better than SBA-16 and KIT-6 which with dimensional pore structure on catalytic activity. Exploring the mechanism by DRIFTS, we can know that the CH3C1 reaction generating aldehyde group then decomposition to CO2 and H2O. In a word, for methyl chloride catalytic combustion system, Co/AICl3-SBA-15 with high CH3Cl conversion rate and good selectivity of products become the best catalyst.