Cellulose is the most abundant component of biomass and one that requires activation energy (Ea) for pyrolysis. In this study, dependence Ea on intrinsic cellulose characteristics, such as degree polymerization (DP), crystallinity, crystal size, was studied in different samples, including samples from Eucalyptus globulus, Ulmus minor, Linun usitatissimum, Olea europaea, Robinia pseudoacacia, Po...

The pyrolysis of coal (C), torrefied sawdust (SPT), paraffin (P), and their blends was evaluated. Iso-conversional methods (i.e. Friedman, Flynn-Wall-Ozawa, Kissinger-Akahira-Sunose) were used to determine the activation energy (Ea); Kissinger method allowed frequency factor (A) calculation Criado Coats-Redfern elucidate reaction mechanism. Thermodynamic parameters transition state (ΔH‡, ΔG‡ ΔS...

This study describes the recycling of green coconut husk powder (CHP) aimed at sustainable production methyl levulinate. The preliminary step involved thermogravimetric analysis and residues after synthesis levulinate with catalyst’s aluminum sulfate (CHP-AS) titanium dioxide (CHP-TD), based on a degradation determination activation energy using Ozawa-Flynn-Wall (OWF) method. Thermogravimetric ...

In the present study, a new copolymer containing pyrazole substituted 1,3-diphenyl-1H-pyrazol-5-yl methacrylate (DPMA) and styrene (St) units, [poly(DPMA-co-St)], was synthesized. Thermal degradation kinetics of system investigated in detail with thermogravimetric analysis (TGA) technique. An increase thermal stability from 252.02 °C to 274.89 observed depending on change heating rate (5 °C/min...

After around 50 years of development, the key substance known as polyethylene has been extremely influential in a variety industries. This paper investigates how materials have used domains water, packaging, and medicine to advance contemporary society order comprehend physical chemical alterations that undergoes after being subjected long-term environmental variables (e.g., temperature, light,...

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...

The present paper investigated the thermodynamics and kinetics of carbothermal reduction fayalite by non-isothermal method combining with thermogravimetric analyzer applying Flynn-Wall-Ozawa (FWO) M?lek models. According to thermodynamic analysis, starting temperature direct reaction was 806.79? in standard state. indirect could not take place While volume percentage CO higher than 86 vol.% non...

Abstract The chemical composition, structural and plastometric properties of different-ranked coals from Mongolia deposits were studied. non-isothermal iso-conversion Ozawa–Flynn–Wall Friedman model-free methods used to assess kinetic parameters differentiate decomposition steps. Key peculiarities the pyrolysis kinetics brown bituminous revealed discussed in terms composition properties. Brown ...

In the present work thermogravimetric techniques were used to study thermal degradation of high-density cork granules. Pyrolysis experiments carried out for four heating ramps (10, 15, 20 and 25 °C.min?1), using nitrogen as carrier gas. From differential (DTG) curves it was seen that mainly occurs from 220 °C 525 main components (suberin, lignin, cellulose, hemicellulose). It also observed temp...

Alkali pretreatment is one of the chemical technologies that has been examined on various types lignocellulosic biomass. To gain a better insight into effects potassium-based catalyst pyrolysis behavior with different materials, potassium bicarbonate (KHCO3) and nitrate (KNO3) were used as additives in this study. The experimental parameters which included particle size, heating rate, additive ...