Thermogravimetric kinetics of polyethelyne degredation over silicoaluminophosphate

Araújo, Antônio S.; Fernandes, Valter J.; Fernandes, Glauber José Turolla

doi:10.1016/s0040-6031(02)00072-2

Cited by 27 publications

(14 citation statements)

References 12 publications

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“…4 shows the dependence of activation energies on˛calculated from various methods for both thermal and catalytic degradation. The average activation energy for the thermal degradation of HDPE was in agreement with previous literature values (250-320 kJ mol −1 ) [16,26]. The catalyst SAPO-11 as expected significantly reduced the activation energy as compared with thermal process, thereby providing evidence for its potential in degradation of HDPE.…”

Section: Resultssupporting

confidence: 89%

“…The curves show similar trend, however, some differences are noted due to difference in samples used and the method employed for calculation of activation energy. Araujo et al [16] reported a weak dependence of activation energy on conversion for˛≥ 0.1. The initial strong and increasing dependence is observed in all the cases due to the reasons mentioned above, for˛≤ 0.1.…”

Section: Resultsmentioning

confidence: 99%

“…The catalytic degradation of polymeric materials has been reported for a large range of model catalysts, including amorphous silica-alumina, zeolites Y, mordenite and ZSM-5 [7][8][9][10][11][12], the family of mesoporous MCM-41 materials [13][14][15] and a few silicoaluminophosphate molecular sieves [16,17]. Catalytic activity is closely related to the amount of acid sites, pore size and also shape of the catalyst [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermal-catalytic degradation of polyethylene over silicoaluminophosphate molecular sieves—A thermogravimetric study

Singhal

Upadhyayula

2010

Journal of Analytical and Applied Pyrolysis

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermal-catalytic degradation of polyethylene over silicoaluminophosphate molecular sieves—A thermogravimetric study

Singhal

Upadhyayula

2010

Journal of Analytical and Applied Pyrolysis

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“…It was observed that polymer degradation was more efficient in the presence of the catalyst. Similar results were observed by Araujo et al [12]. PP is an easily degradable compared to low density polyethylene LDPE and HDPE [13].…”

Section: Introductionsupporting

confidence: 90%

TGA-DSC: A Screening Tool for the Evaluation of Hydrocracking Catalyst Performance

Salman¹,

Nisar²,

Hussain³

et al. 2015

AJAC

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DSC-TGA was used for screening of commercially available and synthesized catalyst for the degradation of polypropylene (PP). In this study, all the runs were performed with 50% load of the catalyst and the results were compared with those of PP + 50% pure silica having no catalytic activity. The degradation behavior of PP using catalyst Zeolyst-713 exhibited much higher degradation activity among the other catalysts used in this study. Moreover, it contributed to lowering of initial stage temperature showing a shape-selective effect. DSC-TGA tools such as Ton, Tmax, T99%, activation energy, enthalpy change in the process and coke content were used for screening. It was concluded that the pore construction and unique acid properties of the Zeolyst-713 as well as proper reaction temperatures were significant influential factors to fully exert this effect. In this work, kinetics of catalytic thermogravimetric degradation of PP used for domestic purposes was investigated using Alumino-silicate catalyst. Zeolyst-713 was observed to lower activation energy and enhances degradation activity in comparison with thermal degradation without a catalyst.

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“…Several investigations on the thermal degradation kinetics of polymer nano-composites based on HDPE have been reported by various authors [10][11][12][13]. Chrissafis et al [14] reported thermal degradation of HDPE/SiO 2 nano-composites, and confirmed their enhanced thermal stability.…”

Section: Introductionmentioning

confidence: 93%

Thermogravimetric kinetics of degradation of HDPE based MWCNTs reinforced composites

Rajeshwari

Dey

2014

Int J Plast Technol

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High Density Polyethylene (HDPE) reinforced multiwalled carbon nanotubes (MWCNTs) composites with MWCNTs loading between 0.0011 and 0.0044 volume fractions are fabricated by melt mixing. The prepared nano-composites are investigated by thermo-gravimetric analyzer (TGA) under nitrogen atmosphere at various heating rates. TGA thermograms indicate only a marginal enhanced thermal stability and no significant mass loss occurs up to~400°C. Thermal degradation kinetics of HDPE/MWCNTs nano-composites has been examined in light of five different analytical methods, viz., Coats-Redfern (CR) integral model fitting approach, 'iterative' based CR(modified) approach, integral form of the rate equation (i.e. FWO and KAS), the differential iso-conversional based method of Friedman. The CR integral model fitting based on 14 different kinetic models are analyzed for TGA data for multiple heating rates. Our analysis indicates that the degradation mechanism of the present nano-composites follows diffusion control (D2, D3 and D4) and first order reaction (F1) mechanisms. The apparent activation energy (E a ) as a function of conversion rate (α) estimated by CR (modified), FWO, KAS and FR methods are all in fair agreement with each other and confirms decrease in E a with increased loading of MWCNTs. The pre-exponential factor (A) calculated also decreases with MWCNTs concentration in HDPE. Activation energy (E a ) for different conversion rate (α) calculated by iso-conversional methods (CR(modified), FWO, KAS and FR) indicates contributions from at least two different degradation mechanisms, namely, diffusion controlled (D2, D3, D4) and first order reaction (F1), which are consistent with the findings of Coats-Redfern (CR) integral model.

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Thermogravimetric kinetics of polyethelyne degredation over silicoaluminophosphate

Cited by 27 publications

References 12 publications

Thermal-catalytic degradation of polyethylene over silicoaluminophosphate molecular sieves—A thermogravimetric study

Thermal-catalytic degradation of polyethylene over silicoaluminophosphate molecular sieves—A thermogravimetric study

TGA-DSC: A Screening Tool for the Evaluation of Hydrocracking Catalyst Performance

Thermogravimetric kinetics of degradation of HDPE based MWCNTs reinforced composites

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