锡掺杂介孔分子筛在木材阻燃中的烟气转化作用

Study on Smoke Catalytic Conversion by Sn-substituted Mesoporous Silica Composite in Wood Fire Retardance

以水热晶化法合成了锡掺杂的介孔分子筛,并采用XRD、N2吸附–脱附、TEM、锥形量热等测试手段对其介观结构和物化性质进行了表征,同时研究了该分子筛与聚磷酸铵(APP)复合在木材燃烧过程中的阻燃性能和烟气转化作用。结果表明,该分子筛具有二维六方(P6mm)介观结构、高的比表面积,与APP复合使用能有效降低杨木的热释放速率(HRR)、总热释放量(THR)、烟生成速率(SPR)和总烟释放量(TSP),可促进炭的生成,表现出优异的阻燃与抑烟特性。同时,该分子筛对阻燃过程中释放的烟气具有转化作用,能够有效地降低CO的浓度,具有减毒作用。

Sn-substituted mesoporous SiO2 （Sn-SiO2） was prepared by hydrothermal crystallization and characterized with XRD, N2 adsorption and TEM techniques. The results showed that the prepared materials exhibited an ordered mesostructures and high surface areas. The effect of poplar treated with Sn-SiO2 and APP on the combustion and smoke was studied by CONE calorimeter. The results show that the heat release rate （HRR）, the total heat release （THR）, the smoke production rate （SPR） and the total smoke production （TSP） decreased remarkably while the char- ring drastically increases, indicating that the compound of Sn-SiO2 and APP have excellent inflame-retarding and smoke inhibition effects for poplar. It is because APE as catalyst, leads to the formation of carbon and the silica en- hances the thermal stability of carbon at a high-temperature. Meanwhile, the Sn-SiO2 shows high catalytic activity for smoke and toxic gas produced by wood combust, which can reduce the concentration of CO effectively and avoid further casualties.