CATALYTIC DEGRADATION OF HIGH DENSITY POLYETHYLENE AND ASSOCIATED MODEL
Catalytic degradation of high density polyethylene (HDPE) using silica-alumina has been investigated in a thermogravimetric analyser, and the degradation kinetics determined using a population balance model recently published by our laboratory. An earlier model used lconsidered only a single catalytic mechanism, and consequently under predicted the amount of gaseous products at high temperatures. The new model accounts for both thermal and catalytic modes of degradation acting in parallel, with the latter influenced by molecular size-dependent surface adsorption, yielding activation energies of about 256 kJ/mol and 174 kJ/mol respectively. This new model agrees better with experimental data than single mechanism models. Whilst catalytic cracking was predominant for most polymer chain sizes, this model shows that thermal cracking is responsible for the over cracking of molecules after desorption from the catalyst, leading to the formation of excessive gaseous products.This model can predict product distributions while varying temperature and catalytic loading.
Sandeep Sarathy Michael D.Wallis Suresh K.Bhatia
Division of Chemical Engineering, The University of Queensland, Brisbane,QLD 4072, Australia
国际会议
成都
英文
96-100
2009-10-11（万方平台首次上网日期，不代表论文的发表时间）