This work uses thermogravimetric analysis to investigate the influence of acidity and accessibility in the catalytic conversion of HDPE under hydrogen atmosphere over parent and Ni-based H-USY and H-ZSM-5 zeolites.
In the present work, the pyrolysis of polypropylene and polyethylene was evaluated with and without the addition of niobium oxide as catalyst by means of thermogravimetric analysis and experiments in a glass reactor. The results revealed that niobium oxide performed well in the pyrolysis of both polypropylene and polyethylene separately. For the mixture of polypropylene with polyethylene, the catalyst reduced the pyrolysis time.
<p>The thermal stability of pseudocyclic and cyclic <i>N</i>-heterocycle-stabilized (hydroxy)aryl- and mesityl(aryl)-l<sup>3</sup>-iodanes (NHIs) through thermogravimetric
analysis (TGA) and differential
scanning calorimetry (DSC) is investigated. NHIs bearing <i>N</i>-heterocycles
with a high N/C-ratio such as triazoles show among the lowest descomposition temperatures and the highest decomposition energies. A comparison of NHIs with known (pseudo)cyclic benziodoxolones is made
and we further correlated their thermal stability with reactivity in a model
oxygenation. </p>