Abstract
The catalytic pyrolysis (CP) of different thermoplastics, polyethylene (PE) and polypropylene (PP), over two types of mesoporous catalysts, desilicated Beta (DeBeta) and Al-MSU-F (AMF), was investigated by thermogravimetric analysis (TGA) and pyrolyzer-gas chromatography/mass spectrometry (Py-GC/MS). Catalytic TGA of PE and PP showed lower decomposition temperatures than non-catalytic TGA over both catalysts. Between the two catalysts, DeBeta decreased the decomposition temperatures of waste plastics further, because of its higher acidity and more appropriate pore size than AMF. The catalytic Py-GC/MS results showed that DeBeta produced a larger amount of aromatic hydrocarbons than AMF. In addition, CP over AMF produced a large amount of branched hydrocarbons.
Highlights
The excessive use of synthetic plastics has led to the accelerated increase in waste plastics. the recycling of waste plastics is considered appropriate for the resource circulation society, many of them are still landfilled or incinerated, because the material recycling of many plastics is still difficult due to the large content of other impurities, such as pigments, paper, and alumina, in the waste plastics
The recycling of waste plastics is considered appropriate for the resource circulation society, many of them are still landfilled or incinerated, because the material recycling of many plastics is still difficult due to the large content of other impurities, such as pigments, paper, and alumina, in the waste plastics
The effective recycling of waste plastics is limited by the economical barrier caused by the low quality of recycled waste plastics [1,2,3,4,5]
Summary
The excessive use of synthetic plastics has led to the accelerated increase in waste plastics. the recycling of waste plastics is considered appropriate for the resource circulation society, many of them are still landfilled or incinerated, because the material recycling of many plastics is still difficult due to the large content of other impurities, such as pigments, paper, and alumina, in the waste plastics. The high heating value of consumable plastics suggests the potential value of waste plastics as a source of energy or fuel recovery [6,7]. In this aspect, pyrolysis, a thermal decomposition reaction of plastics at temperatures between 400 and 600 ◦ C under oxygen free conditions [8,9,10,11], can be considered an appropriate method for both the treatment of waste plastics and the production of fuel or chemical feedstock from waste plastics. Zhang et al [13]
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