Catalytic pyrolysis and gasification of waste textile under carbon dioxide atmosphere with composite Zn-Fe catalyst

摘要

With thermogravimetric apparatus (TGA), X-ray diffraction (XRD) and Scanning electron microscopy (SEM), the catalytic pyrolysis and gasification characteristics of waste textiles (Polyester Fiber (PF), Cotton and Woolen) using several common metallic oxide as catalysts were studied at atmospheric pressure under CO2 atmosphere, several parameters including catalysts' types, loadings and reaction temperatures were also conducted. Results showed that the pyrolysis reaction of the three textiles was best enhanced by 5 wt% ZnO while the gasification reaction was best enhanced by 5 wt% Fe2O3. The pyrolysis and gasification processes were also quantitatively evaluated by using shrinking core model. The apparent pyrolysis activation energies for textile with 5 wt% ZnO loading were 65.1 kJ/mol, while the apparent gasification activation energies for textile char with 5 wt% Fe2O3 loading were 89.0 kJ/mol, which is significantly lower than un-catalytic textiles in our previous study. Besides. a Zn-Fe composite catalyst was prepared by sol gel method, and the catalytic effect of the composite catalyst was better than that of the single catalyst. The findings reported in the manuscript are beneficial to the development of energy utilization of waste textile under carbon dioxide atmosphere. (C) 2017 Elsevier B.V. All rights reserved.