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|Title: ||Catalytic degradation of polyethylene : an evaluation of the effect of dealuminated Y Zeolites using thermal analysis|
|Authors: ||Neves, I. C.|
Machado, A. V.
|Issue date: ||2007|
|Abstract: ||Commercial samples of high density polyethylene were degraded overYzeolites with different Si/Al: ultrastableYzeolite (USY) and three dealuminated
Yzeolites (HY(4), HY(12) and HY(20)). Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC)was used aiming
to evaluate the apparent activation energy of polymer cracking. The results obtained showthat the efficiency of different zeoliteswas due to their acidity.
Ahigh Si/Al ratio gave a greater acidity to zeolites and the onset degradation temperature of the polymer and related activation energy decreased.
The sample residues obtained after an isothermic TGA, were analysed by DSC and it was observed that the crystallinity decreases with the acidity
of zeolites. HY(20) zeolite was the most active catalyst due to the isolation of the residual Brønsted acid sites which promote their strong acidity.|
|Appears in Collections:||IPC - Artigos em revistas científicas internacionais com arbitragem|
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