Niobium Oxide as Catalyst for the Pyrolysis of Polypropylene and Polyethylene Plastic Waste

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.

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Kinetic studies on the pyrolysis of plastic waste using a combination of model-fitting and model-free methods

Waste Management & Research ◽

10.1177/0734242x19897814 ◽

2020 ◽

Vol 38 (1_suppl) ◽

pp. 77-85 ◽

Cited By ~ 8

Author(s):

Zhitong Yao ◽

Shaoqi Yu ◽

Weiping Su ◽

Weihong Wu ◽

Junhong Tang ◽

...

Keyword(s):

Reaction Mechanism ◽

Thermogravimetric Analysis ◽

Compensation Effect ◽

Model Fitting ◽

Plastic Waste ◽

Plastic Shell ◽

Ozawa Method ◽

Heating Rates ◽

Helium Atmosphere ◽

Model Free

In this work, the pyrolysis behavior of plastic waste—TV plastic shell—was investigated, based on thermogravimetric analysis and using a combination of model-fitting and model-free methods. The possible reaction mechanism and kinetic compensation effects were also examined. Thermogravimetric analysis indicated that the decomposition of plastic waste in a helium atmosphere can be divided into three stages: the minor loss stage (20–300°C), the major loss stage (300–500°C) and the stable loss stage (500–1000°C). The corresponding weight loss at three different heating rates of 15, 25 and 35 K/min were determined to be 2.80–3.02%, 94.45–95.11% and 0.04–0.16%, respectively. The activation energy ( Ea) and correlation coefficient ( R2) profiles revealed that the kinetic parameters calculated using the Friedman and Kissinger–Akahira–Sunose method displayed a similar trend. The values from the Flynn–Wall–Ozawa and Starink methods were comparable, although the former gave higher R2 values. The Eα values gradually decreased from 269.75 kJ/mol to 184.18 kJ/mol as the degree of conversion ( α) increased from 0.1 to 0.8. Beyond this range, the Eα slightly increased to 211.31 kJ/mol. The model-fitting method of Coats–Redfern was used to predict the possible reaction mechanism, for which the first-order model resulted in higher R2 values than and comparable Eα values to those obtained from the Flynn–Wall–Ozawa method. The pre-exponential factors (ln A) were calculated based on the F1 reaction model and the Flynn–Wall–Ozawa method, and fell in the range 59.34–48.05. The study of the kinetic compensation effect confirmed that a compensation effect existed between Ea and ln A during the plastic waste pyrolysis.

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Purity Evaluation of Single-Walled Carbon Nanotubes Using Thermogravimetric Analysis

Korean Journal of Metals and Materials ◽

10.3365/kjmm.2013.51.2.137 ◽

2013 ◽

Vol 51 (2) ◽

pp. 137-144

Author(s):

Naesung Lee ◽

Jeung Choon Goak ◽

Tae Yang Kim ◽

Jongwan Jung ◽

Young-Soo Seo ◽

...

Keyword(s):

Carbon Nanotubes ◽

Thermogravimetric Analysis ◽

Single Walled Carbon Nanotubes ◽

Single Walled Carbon ◽

Purity Evaluation ◽

Walled Carbon Nanotubes

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Autowave Chemical Transformations of Highly Exothermic Mixture Based on Niobium Oxide with Aluminum

Физика горения и взрыва ◽

10.15372/fgv20170512 ◽

2017 ◽

Keyword(s):

Niobium Oxide ◽

Chemical Transformations ◽

Exothermic Mixture

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Study on Wheat Gluten Biopolymer: a Novel Way to Eradicate Plastic Waste

Indian Journal Of Applied Research ◽

10.15373/2249555x/aug2013/81 ◽

2011 ◽

Vol 3 (8) ◽

pp. 253-255

Author(s):

Neha Patni ◽

◽

Pujita Yadava ◽

Anisha Agarwal ◽

Vyoma Maroo

Keyword(s):

Wheat Gluten ◽

Plastic Waste

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THERMOGRAVIMETRIC ANALYSIS OF THE (FeCoZr)x(CaF2)(100–x) NANOCOMPOSITE

High Temperature Material Processes An International Quarterly of High-Technology Plasma Processes ◽

10.1615/hightempmatproc.2018025484 ◽

2017 ◽

Vol 21 (4) ◽

pp. 289-298 ◽

Cited By ~ 1

Author(s):

Vitalii Bondariev ◽

Pawel Zukowski ◽

V. G. Luhin ◽

I. V. Voitov

Keyword(s):

Thermogravimetric Analysis

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Thermal Stability of N-Heterocycle-Stabilized Iodanes – A Systematic Investigation

10.26434/chemrxiv.8964848 ◽

2019 ◽

Author(s):

Andreas Boelke ◽

Yulia A. Vlasenko ◽

Mekhman S. Yusubov ◽

Boris Nachtsheim ◽

Pavel Postnikov

Keyword(s):

Thermal Stability ◽

Differential Scanning Calorimetry ◽

Thermogravimetric Analysis ◽

Systematic Investigation ◽

Scanning Calorimetry ◽

Thermal Stability Of

The thermal stability of pseudocyclic and cyclic N-heterocycle-stabilized (hydroxy)aryl- and mesityl(aryl)-l3-iodanes (NHIs) through thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) is investigated. NHIs bearing N-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.

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