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

doi:10.3724/SP.J.1077.2013.12382

Abstract

Abstract:

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.

Key words: mesoporous silica, fire resistance of wood, catalytic oxidation, smoke inhibition and conversion

CLC Number:

TQ351

XIA Liao-Yuan, WU Yi-Qiang, HU Yun-Chu. Study on Smoke Catalytic Conversion by Sn-substituted Mesoporous Silica Composite in Wood Fire Retardance[J]. Journal of Inorganic Materials, 2013, 28(5): 532-536.

Figures/Tables 6

Table 1 The preparation conditions and combustion parameters of the treated poplar powder by CONE test

Sample	SiO₂/g	Sn-SiO₂/g	APP/g	Poplar/g	THR/(MJ·m^-2)	TSP/m²	^am-COY/(kg·kg^-1)	^bm-CO₂Y/(kg·kg^-1)
s-0	0	0	0	20	23.58	0.7302	0.0354	1.4522
s-1	0	0	2.4	20	7.18	0.2764	0.1236	0.5805
s-2	0.8	0	1.6	20	12.64	0.1062	0.0740	0.9916
s-3	0	0.8	1.6	20	11.75	0.0413	0.0468	0.9502

Fig. 1 XRD patterns of the mesoporous SiO2 and Sn-SiO2 synthesized by hydrothermal crystallization methods

Fig. 2 Nitrogen adsorptions/desorption isotherms and pore size distributions for the mesoporous SiO2 and Sn-SiO2

Fig. 3 Different magnification TEM images of the mesoporous Sn-SiO2 synthesized by hydrothermal crystallization methods

Fig. 4 THR (a), HRR (b), TSP (c) and SPR (d) curves of poplar and poplar treated with APP and the mesoporous SiO2 and Sn-SiO2 composites

Fig. 5 COP (a) and CO2P (b) curves of poplar and poplar treated with APP and the mesoporous SiO2 and Sn-SiO2 composites

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