Model-free kinetics analysis of nanocrystalline HZSM-5 catalyzed pyrolysis of polypropylene (PP)

Saha, Biswajit; Reddy, P. Karthik; Chowlu, Aie Cheng King; Ghoshal, Aloke Kumar

doi:10.1016/j.tca.2007.12.004

Cited by 17 publications

(10 citation statements)

References 27 publications

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“…The diffusional resistances became predominant for the catalysts' micropores, which could lower the releasing speed of the pyrolysis volatile products in comparison to non-catalytic pyrolysis. Similar observations were reported during the catalytic pyrolysis of polypropylene over nanocrystalline HZSM-5 [46] and the catalytic pyrolysis of waste LDPE over ZSM-5 [47]. Therefore, the releasing of the pyrolysis volatiles required longer time with the presence of the Ga/HZSM-5 catalyst than non-catalytic pyrolysis (Figure 4), and the production rate of pyrolysis oil could be reduced during catalytic conversion (Figure 5).…”

Section: Resultssupporting

confidence: 81%

Reaction chemistry and kinetics of corn stalk pyrolysis without and with Ga/HZSM-5

Huang

Xie

Yang

et al. 2018

J Therm Anal Calorim

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The bifunctional Ga/HZSM-5 catalyst has been proven having the capabiliity to increase the selectivity of aromatics production during catalytic pyrolysis of furan and woody biomass. However, the reaction chemistry and kinetics of pyrolysis of herbaceous biomass promoted by Ga/HZSM-5 is rarely reported. Pyrolysisgas chromatography / mass spectrometry (Py-GC/MS) analysis and nonisothermal thermogravimetric (TG) analysis at four heating rates were carried out to investigate the decomposition behavior and pyrolysis kinetics of corn stalk without and with Ga/HZSM-5. The effective activation energies for corn stalk pyrolysis were calculated by using the Friedman isoconversional method. The Py-GC/MS analysis results indicated that the Ga/HZSM-5 catalyst had a high selectivity towards producing the aromatic chemicals of xylene, toluene and benzene, whereas the major products from noncatalytic pyrolysis of corn stalk were oxygenated compounds. The presence of Ga/HZSM-5 could significantly reduce the effective activation energies of corn stalk pyrolysis from 159.9-352.4 kJ mol-1 to 41.6-99.8 kJ mol-1 in the conversion range of 0.10-0.85.

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Section: Resultssupporting

confidence: 81%

Reaction chemistry and kinetics of corn stalk pyrolysis without and with Ga/HZSM-5

Huang

Xie

Yang

et al. 2018

J Therm Anal Calorim

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“…This lower limiting oxygen index of the PP makes it easily flammable when compared to the polymers used in industries. Over the years, it has been evidently proved that the addition of clay nanoparticles is an effective technique to reduce the flammability of polymers .…”

Section: Introductionmentioning

confidence: 99%

Thermal degradation kinetics of polypropylene/clay nanocomposites prepared by injection molding compounder

et al. 2019

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Polypropylene/clay nanocomposites with different nanoparticles are prepared using a specially designed polymer nanocomposite injection molding compounder with a hyperbolic nozzle. The thermal degradation kinetics is studied by estimating the kinetic parameter, activation energy through ASTM E1641 procedure and by the procedures suggested by ICTAC. The activation energies of PP/MMT and PP/OMHT are increasing from 121 and 147 kJ/mol K, respectively, while PP/OMMT and PP/MICA are rather on a linear or a slightly decreasing trend from 160 and 165 kJ/mol K, respectively, over the extent of conversion. The similar trend can be observed in pre-exponential factor between the different nanocomposites. The reaction model curve explains the complexity of the degradation over the extent of conversion for different nanocomposites. The optimum working temperature of the different nanocomposites prepared is estimated from the kinetic parameters obtained. The nanocomposites PP/OMMT and PP/MICA can operate for 20,000 h before losing its efficiency at 211 and 209 C, respectively, whereas, PP/MMT and PP/OMHT can operate at 165 and 198 C, respectively. The influence of the different nanoparticles, their physical and chemical characteristics in the improvement of the thermal stability has been explained.

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“…(1) Where: ′ 0 and ′ , 0 are the experimental and calculated α-pinene initial reaction rate, respectively. The models were compared using statistical parameters [52,53]: variance s 2 , square root mean deviation Rmsd, coefficient of determination 2 , adjusted coefficient of determination 2 , and 95% confidence intervals (IC). Table 4 Table 4 shows the kinetics expressions proposed for the α-pinene initial reaction rate based on pseudo-homogeneous (PH) and LHHW models, and presents LHHW-based models for the α-pinene reaction rate adjustment up to 23 h of reaction.…”

Section: Figmentioning

confidence: 99%

Kinetic study of α-pinene allylic oxidation over FePcCl16-NH2-SiO2 catalyst

Becerra

González

Villa

2016

Journal of Molecular Catalysis A: Chemical

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Model-free kinetics analysis of nanocrystalline HZSM-5 catalyzed pyrolysis of polypropylene (PP)

Cited by 17 publications

References 27 publications

Reaction chemistry and kinetics of corn stalk pyrolysis without and with Ga/HZSM-5

Reaction chemistry and kinetics of corn stalk pyrolysis without and with Ga/HZSM-5

Thermal degradation kinetics of polypropylene/clay nanocomposites prepared by injection molding compounder

Kinetic study of α-pinene allylic oxidation over FePcCl16-NH2-SiO2 catalyst

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