Catalytic Pyrolysis of Seawater Aged Polypropylene Over HZSM-5, HY, and Al-MCM-41

The effect of seawater aging on the thermal and catalytic pyrolysis of polypropylene (PP) was investigated using a thermogravimetric analyzer and pyrolyzer-gas chromatography/mass spectrometry. Although the surface properties of PP were of the oxidized form by seawater aging, the decomposition temperature and non-catalytic pyrolysis products of PP were relatively unchanged largely due to seawater aging. The catalytic pyrolysis of seawater-aged PP over all the catalysts produced smaller amounts of aromatic hydrocarbons than that of fresh PP due to catalyst poisoning caused by the residual inorganics. Among the catalysts, microporous HZSM-5 (SiO2/Al2O3:23) produced the largest amount of aromatic hydrocarbons followed in order by microporous HY(30) and nanoporous Al-MCM-41(20) from seawater-aged PP due to the high acidity and appropriate pore size for the generation of aromatic hydrocarbons.

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Catalytic Pyrolysis of Waste Achyranthes Root Over Al-MCM-41

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2021.19197 ◽

2021 ◽

Vol 21 (7) ◽

pp. 4081-4084

Author(s):

Seul-Bee Lee ◽

Young-Min Kim ◽

Ji-Hui Park ◽

Young-Kwon Park

Keyword(s):

Mass Spectrometry ◽

Gas Chromatography ◽

Aromatic Hydrocarbons ◽

Catalytic Pyrolysis ◽

The Other ◽

Gas Chromatography Mass Spectrometry ◽

Acidic Properties ◽

Achyranthes Root ◽

Formation Efficiency ◽

Mcm 41

This study examined the thermal and catalytic pyrolysis of waste Achyranthes Root (AR) using pyrolyzer-gas chromatography/mass spectrometry (Py-GC/MS). The non-catalytic pyrolysis of waste AR produced various kinds of oxygenates, such as acetic acid, hydroxy propanone, furfural, phenol, cresol, guaiacols, syringols, and so on. By applying nanoporous Al-MCM-41 with acidic properties and mesopores to the pyrolysis of waste AR, the levels of furan and aromatic hydrocarbons production increased with a concomitant decrease in the other oxygenates. The formation efficiency of furans was improved further by increasing the amount of Al-MCM-41 applied to the catalytic pyrolysis of waste AR.

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Catalytic Pyrolysis of Polyethylene and Polypropylene over Desilicated Beta and Al-MSU-F

Catalysts ◽

10.3390/catal8110501 ◽

2018 ◽

Vol 8 (11) ◽

pp. 501 ◽

Cited By ~ 6

Author(s):

Hyung Lee ◽

Young-Kwon Park

Keyword(s):

Mass Spectrometry ◽

Gas Chromatography ◽

Thermogravimetric Analysis ◽

Pore Size ◽

Aromatic Hydrocarbons ◽

Catalytic Pyrolysis ◽

Gas Chromatography Mass Spectrometry ◽

Waste Plastics ◽

Mesoporous Catalysts ◽

Branched Hydrocarbons

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.

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