The study of ZnAl and ZnFe layered double hydroxide on the catalytic dechlorination and fire safety of polyvinyl chloride

The effect of OZnAl-LDH and OZnFe-LDH on the catalytic dechlorination, thermal decomposition and smoke suppression of polyvinyl chloride (PVC) during pyrolysis processes was investigated and compared. The thermal degradation and combustion behavior of the PVC composites were investigated by thermogr...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2020-04, Vol.140 (1), p.115-123
Main Authors: Gao, Zehua, Lu, Lihong, Shi, Congling, Qian, Xiaodong, Wang, Xuebao, Zhang, Guoyun, Zhou, Mingtao, Pan, Yuhao
Format: Article
Language:English
Subjects:
Analysis
Analytical Chemistry
Calorimetry
Chemistry
Chemistry and Materials Science
Combustion
Composite materials
Dechlorination
Fire prevention
Fire protection
Fire safety
Furnaces
Graphitization
High temperature
Hydroxides
Inorganic Chemistry
Measurement Science and Instrumentation
Physical Chemistry
Polymer Sciences
Polyvinyl chloride
Pyrolysis
Raman spectroscopy
Refuse and refuse disposal
Smoke
Thermal decomposition
Thermal degradation
Thermal stability
Thermogravimetric analysis
Tube furnaces
Waste disposal
Waste management
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Summary:The effect of OZnAl-LDH and OZnFe-LDH on the catalytic dechlorination, thermal decomposition and smoke suppression of polyvinyl chloride (PVC) during pyrolysis processes was investigated and compared. The thermal degradation and combustion behavior of the PVC composites were investigated by thermogravimetric analysis and cone calorimetry, respectively. The results indicate that the addition of LDHs brought about the improved thermal stability and reduced heat release of PVC composites at high temperature. The smoke suppression properties of the composites are investigated by steady-state tube furnace. The results revealed that the toxic gases such as CO, CH 4 , NO x and N 2 O were inhibited by both two LDHs, but the OZnAl-LDH has better effect on the smoke suppression. Subsequently, the char layer was investigated by scanning electron microscopy–energy-dispersive spectrometry and Raman analysis. The results indicated that the LDHs can promote the dechlorination of PVC and form graphitized structures. Generally, OZnAl-LDH and OZnFe-LDH can be potential catalysts for waste disposal and improve the fire safety of PVC.
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-019-08659-x