Degradação de poliolefinas utilizando catalisadores zeolíticos

Abstract

Neste trabalho foi estudada a degradação de alguns dos principais constituintes dos rejeitos plásticos (polietileno de alta densidade (HDPE), polietileno de baixa densidade (LDPE) e polipropileno (PP)), empregando-se um catalisador exausto de unidades de craqueamento de fluidos (FCC) e um catalisador zeolítico (ADZ3) sintetizado em laboratório. Utilizando técnicas de termogravimetria (TG-DTG) e cromatografia gasosa (CG), foi possível avaliar os produtos gerados no craqueamento destas poliolefinas. Na degradação catalítica de poliolefinas com catalisadores zeolíticos, verificou-se a obtenção preferencial de gasolina, GLP e diesel, produtos importantes na matriz energética brasileira. O catalisador de FCC exausto foi mais seletivo para a produção de gasolina e GLP, enquanto que a produção de diesel foi mais favorecida com o catalisador ADZ3.

Thermal and catalytic pyrolysis of plastic waste

“…In fact, from recycling it is possible to recover raw materials, energy and fuel while minimizing the consumption of natural resources and raw materials. When these products and energy are recovered, the environmental impacts of industrial activity are reduced [1,3,9,10] . Municipal waste plastics are heterogeneous, unlike industrial.…”

Thermo-catalytic degradation of PE and UHMWPE over zeolites with different pore systems and textural properties

“…Despite the advantages offered by these materials, the progressive increase in their production causes several environmental problems due to the inadequate disposal of their residues, because they have a low-rate of biodegradability, owing to their chemical structure making them resistant to many natural degradation processes [3][4][5]. Conventional recycling provides limited applicability of recycled plastic waste and allows the emission of toxic compounds to the environment [6,7]. Given this, chemical treatments increasingly become an advantageous alternative route because they allow the processing of plastic waste, reducing the costs of pretreatment, collection, and selection.…”

Thermal and Catalytic Pyrolysis of Plastic Waste

“…In fact, from recycling it is possible to recover raw materials, energy and fuel while minimizing the consumption of natural resources and raw materials. When these products and energy are recovered, the environmental impacts of industrial activity are reduced [1,3,9,10] .…”