Engine oils undergo oxidative degradation and wears out during service. Hence it is important to characterize ageing of engine oils at different simulated conditions to evaluate the performance of existing oils and also design new formulations. This work focuses on characterizing the thermo-oxidative degradation of synthetic and semi-synthetic engine oils aged at 120, 149 and 200 °C. Apparent a...

The hydrothermal synthesis of a mcallisterite (Mg2(B6O7(OH)6)2 · 9(H2O)) mineral at low temperatures was characterized. For this purpose, several reaction temperatures (0-70°C) and reaction times (30-240 min) were studied. Synthesized minerals were subjected to X-ray diffraction (XRD), fourier transform infrared (FT-IR), and Raman spectroscopies and scanning electron microscopy (SEM). Additiona...

In this study, the combustion of olive byproducts was investigated using TG-FTIR technique. Different types biomass were considered: twigs, leaves, olive-mill waste from two-phase decanting method, and wastewater three-phase system. The reaction regions, ignition, burnout temperatures at different heating rates determined TG/DTG analysis thermogravimetry results. Comprehensive combustion, burno...

Seaweed has attracted considerable attention as a potential biofuel feedstock. The pyrolytic and kinetic characteristics of maize straw and the seaweed Ulva pertusa were studied and compared using heating rates of 10, 30 and 50°C min(-1) under an inert atmosphere. The activation energy, and pre-exponential factors were calculated by the Flynn-Wall-Ozawa (FWO), Kissinger-Akahira-Sunose (KAS) and...

Aluminosilicate gel precursor having mullite composition was synthesized from inorganic salts of aluminum and silicon by employing the sol-gel method. Chemical analysis, surface area and bulk density measurements were performed to characterize the dried gel. The course of the mullitization was examined by FT-IR analysis which confirmed the diphasic nature of the gel. ...

The aim of this study is to examine the behaviour melon seed pyrolysis and calculate its kinetic parameters along with thermodynamic properties. thermogravimetric analysis experiments were conducted from ambient temperature 800°C under nitrogen atmosphere at heating rates 5, 10, 20 40°C/min. It was determined that process underwent through four stages where second third active stages. Kinetic c...

Abstract As an alternative energy source for fossil energy, use of biomass pyrolysis to reduce pyrolusite is great significance conservation, emission reduction and environmental protection. Kinetics thermodynamics reducing using was studied thermogravimetric analysis analysis. Five non-isothermal methods, Flynn-Wall-Ozawa, Kissinger-Akahira-Sunose, Distributed Activation Energy Model, Starink ...

The data for the nonisothermal and isothermal thermal decompositions of lanthanum oxalate have been analysed using model-free model-fitting kinetic techniques. When applied to Coat-Redfern(CR) equation, widely used approach that results excellent fitting both but produces very ambiguous values Arrhenius parameters. These cannot be compared those obtained from experiments. On other hand, strateg...

Thermal degradation behavior, exothermic patterns, and kinetic parameters of symmetrically/asymmetrically substituted polysilanes during the kumada thermal rearrangement in temperature range 100–450 °C, were investigated applying thermogravimetric (TGA) differential scanning calorimetric (DSC) techniques. Three kinds polysilanes, viz., Polydimethylsilane (PDMS), Polydiphenylsilane (PDPS) Polyme...

NaOH, dolomite and NiCl2 were used as catalysts to examine their effects on co–pyrolysis with waste bicycle tires (WT) engine oil (WEO). The pyrolysis behaviors investigated by thermogravimetric analysis. activation energy of the catalytic main reaction stage was derived Kissinger–Akahira–Sunose (KAS) method under four different heating rates conditions. calculations show that all three can red...