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

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 charring drastically increases,indicating that the compound of Sn-SiO2 and APP have excellent inflame-retarding and smoke inhibition effects for poplar.It is because APP,as catalyst,leads to the formation of carbon and the silica enhances 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.