Kinetic and activation thermodynamic parameters on thermal decomposition of synthetic lubricant oils

Santos, José Carlos Oliveira; Oliveira, Amanda Dantas de; Silva, C. C.; Silva, J. D. S.; Souza, A. G.; Lima, Lionete Nunes de

doi:10.1007/s10973-006-7774-0

Cited by 23 publications

(7 citation statements)

References 14 publications

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“…Activation energy (E a ) of the oxidation process was defined using the Coats-Redfern method (Kok 2002;Xie and He 1998;Santos et al 2007;Coats and Redfern 1964). This method is based on the Eq.…”

Section: Reactivity Parametersmentioning

confidence: 99%

Non-isothermal oxidation of coal with Ce(NO3)3 and Cu(NO3)2 additives

Ларионов

Gromov

2019

Int J Coal Sci Technol

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Non-isothermal oxidation of brown coal with 5 wt% of Cu(NO 3) 2 , 5 wt% of Ce(NO 3) 3 and {2.5 wt% Cu(NO 3) 2 ? 2.5 wt% Ce(NO 3) 3 } additives was studied. The introduction of additives was carried out by an incipient wet impregnation method to ensure uniform distribution of cerium and copper nitrates within the structure of coal powdery samples (according to SEM and EDX mapping). The samples reactivity was studied in an isothermal oxidation regime at 200°C (1 h) and by DSC/TGA at 2.5°C/min heating rate. The additives implementation was found to reduce significantly the oxidation onset temperature (DT i = 20-55°C), the samples oxidation delay time (Dt i = 2-22 min) and overall duration of the oxidation process (Dt c = 8-16 min). The additives efficiency could be graded in accordance with the activation on the coal oxidation in the following row: Cu(NO 3) 2 [ {Cu(NO 3) 2 ? Ce(NO 3) 3 } [ Ce(NO 3) 3. According to the mass spectroscopy, the obtained row of activation correlates well with the initial temperature of the studied nitrate's decomposition (from 190 to 223°C). A presence of nitrates was found to change significantly the trend of heat release taking place during the oxidation of coal samples (according to DSC/TGA data). The influence of coal morphology and volatiles content in initial sample on the parameters of the oxidation process was studied as well. Activation energy (E a) of the coal oxidation was calculated using Coats-Redfern method. Maximum decrease in E a from 69 to 58 kJ/mol was observed for the samples with Cu(NO 3) 2 .

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Section: Reactivity Parametersmentioning

confidence: 99%

Non-isothermal oxidation of coal with Ce(NO3)3 and Cu(NO3)2 additives

Ларионов

Gromov

2019

Int J Coal Sci Technol

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“…The thermal stability of oils is important in defi ning the operability conditions for lubricants prepared using such vegetable oils [146][147][148][149]. In this respect, Moringa oil, commercially also known as 'ben oil' or 'behen oil' because of its content of behenic (docosanoic) acid (6.0%), is of considerable interest as it possesses favourable oxidation and thermal stability characteristics in comparison to other oils, including canola oil, CSO, Jatropha oil and SNO [145,150]; see also Table 5.14.…”

Section: Thermo-oxidative Stabilitymentioning

confidence: 99%

Renewable feedstocks for lubricant production

Bart¹,

Gucciardi²,

Cavallaro³

2013

Biolubricants

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“…In this way, when waste oils are released directly into the environment (in water, sewage and soil networks) or when uncontrolled burning, they cause serious soil, water and air pollution problems. When released into the soil, the waste oils seep into the ground with the rainwater contaminating the soil they pass through, and when they reach underground groundwater, they also pollute the water from fountains and wells [3,4]. When discharged into wastewater drainage systems, they pollute water receiving facilities and also cause significant damage to wastewater treatment plants.…”

Section: Introductionmentioning

confidence: 99%

“…When discharged into wastewater drainage systems, they pollute water receiving facilities and also cause significant damage to wastewater treatment plants. The used oil contains high levels of hydrocarbons and metals [4], being the most representative iron, lead, zinc, copper, chromium, nickel and cadmium. The indiscriminate burning of the lubricating oil used, without prior treatment of demetallation, generates significant emissions of metallic oxides in addition to other toxic gases, such as dioxins and sulfur oxides.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2018

PPS

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Lubricating oils are substances of mineral or synthetic base responsible for forming a protective film, which prevents direct contact between two surfaces that move with each other. The lubricant mixture is formed by the addition of additives to the base oil obtained in the distillation of petroleum. When used oils are released directly into the environment or when uncontrolled burning causes serious soil, water and air pollution problems. Recycling the lubricant means applying physical-chemical processes on the used oil, making it possible to obtain base oil, a raw material that can be reused to obtain lubricants. The objective of the present work is to evaluate the recent processes of recovery of used automotive lubricating oils.

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Kinetic and activation thermodynamic parameters on thermal decomposition of synthetic lubricant oils

Cited by 23 publications

References 14 publications

Non-isothermal oxidation of coal with Ce(NO3)3 and Cu(NO3)2 additives

Non-isothermal oxidation of coal with Ce(NO3)3 and Cu(NO3)2 additives

Renewable feedstocks for lubricant production

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