Catalytic pyrolysis of lignocellulosic bio-packaging (jute) waste – kinetics using lumped and DAE (distributed activation energy) models and pyro-oil characterization

RSC Advances ◽  
2015 ◽  
Vol 5 (120) ◽  
pp. 98934-98945 ◽  
Author(s):  
S. Poddar ◽  
S. De ◽  
R. Chowdhury
Keyword(s):  
Activation Energy ◽  
Catalytic Pyrolysis ◽  
Packaging Material ◽  
Isothermal Conditions ◽  
Energy Models ◽  
Oil Characterization ◽  
Jute Waste ◽  
Set Up

The present study concentrates on the catalytic pyrolysis of a waste bio-packaging material, namely, jute, under iso-thermal and non-isothermal conditions using a 50 mm diameter and 164 mm long semi-batch pyrolyzer and a TGA set-up, respectively.

Distributed activation energy models of isomerisation reactions from hydrous pyrolysis

1993 ◽  
Vol 20 (4) ◽  
pp. 511-520 ◽  
Author(s):  
Ulrich Ritter ◽  
Kaare Aareskjold ◽  
Liv Schou
Keyword(s):  
Activation Energy ◽  
Energy Models ◽  
Hydrous Pyrolysis

scholarly journals The non-isothermal kinetics of hydroxyapatite formation in kaolin - natural phosphate mixtures

2019 ◽  
Vol 9 (1) ◽  
pp. 1-7
Author(s):  
Fateh Chouia ◽  
Hocine Belhouchet ◽  
Toufik Sahraoui
Keyword(s):  
Activation Energy ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Exothermic Peak ◽  
Isothermal Kinetics ◽  
Heating Rates ◽  
Natural Phosphate ◽  
Isothermal Conditions ◽  
Kinetics Of ◽  
Hydroxyapatite Formation

In this work, the activation energy of hydroxyapatite formation in different composites under non-isothermal conditions was determined using differential thermal analysis (DTA). Seven compositions were prepared and studied while varying the percentage of the kaolin from 20 to 80 wt.% at 10% increments. The DTA conducted at heating rates of 10, 20 and 30 K min−1 showed an exothermic peak in all composites in the region 700°C–750°C associated with hydroxyapatite formation. The activation energies measured from non-isothermal treatments for seven compositions (20, 30, 40, 50, 60, 70 and 80 mass% of kaolin) were 194, 178, 178, 209, 162, 146 and 121 kJ mol−1, respectively.   Keywords:energy, kinetics,  kaolin - natural, phosphate mixtures

Kinetics of Rapid Thermal Oxidation of Silicon

1987 ◽  
Vol 92 ◽  
Author(s):  
Stephan E. Lassig ◽  
Thomas J. Debolske ◽  
John L. Crowley
Keyword(s):  
Activation Energy ◽  
Thermal Oxidation ◽  
Kinetic Data ◽  
Halogen Lamp ◽  
Heating Source ◽  
Rapid Thermal Oxidation ◽  
Set Up ◽  
Lamp Source ◽  
Kinetics Of ◽  
Tungsten Halogen Lamp

ABSTRACTThis paper presents kinetic data for the rapid thermal oxidation (RTO) of <100 silicon using a wall stabilized low pressure arc lamp as the heating source. The data shows a single activation energy of 1.31 eV over the temperature range of 900°C to 1200°C and times of 60 seconds to 240 seconds. Comparisons are made with published kinetic data of RTO using tungsten-halogen lamp source [1] and with furnace oxidation kinetics for short times (<240 sec.) [2]. “Wet” oxidation results using O2:H2 as the oxidizing ambient reveal a lower activation energy and preexponential coefficient than the dry oxidation. Also presented are results using an experimental set-up which exhibits ultraviolet enhanced oxidation.

scholarly journals Preparation procedure to obtain iron nanopowder under non-isothermal conditions

2021 ◽  
pp. 28-35
Author(s):  
Тиен Хиеп Нгуен ◽  
Ван Минь Нгуен ◽  
Мань Хунг Нгуен ◽  
Виталий Николаевич Данчук
Keyword(s):  
Activation Energy ◽  
Hydrogen Reduction ◽  
Reduction Process ◽  
Preparation Procedure ◽  
Specific Rate ◽  
Temperature Range ◽  
Isothermal Conditions ◽  
Fe Nanoparticles ◽  
Mixed Reaction ◽  
Maximum Specific Rate

The kinetics for the procedure of preparing iron nanopowder from α-FeOOH by hydrogen reduction under non-isothermal conditions were studied. The reduction of α-FeOOH nanopowder was shown to occur within the temperature range from 180 to 550 °С, with a maximum specific rate value attained at 500 °С. The activation energy for the reduction process α-FeOOH nanopowder was measured to be ~43 kJ/mol, evidencing a mixed reaction mode. Performing the reduction of α-FeOOH at 500 °С accelerated the process while ensuring the required properties of the product obtained. The Fe nanoparticles thus prepared were of rounded shape, the size ranging from 70 to 100 nm.

scholarly journals Role of Functional Groups in the Monomer Molecule on the Radical Polymerization in the Presence of Graphene Oxide. Polymerization of Hydroxyethyl Acrylate under Isothermal and Non-Isothermal Conditions

Molecules ◽  
2022 ◽  
Vol 27 (2) ◽  
pp. 345
Author(s):  
Ioannis S. Tsagkalias ◽  
Dimitrios S. Achilias
Keyword(s):  
Activation Energy ◽  
Graphene Oxide ◽  
Hydrogen Bonds ◽  
Radical Polymerization ◽  
Functional Groups ◽  
Reaction Rate ◽  
Monomer Molecule ◽  
Polymer Molecules ◽  
Isothermal Conditions

Functional groups in a monomer molecule usually play an important role during polymerization by enhancing or decreasing the reaction rate due to the possible formation of side bonds. The situation becomes more complicated when polymerization takes place in the presence of graphene oxide since it also includes functional groups in its surface. Aiming to explore the role of functional groups on polymerization rate, the in situ bulk radical polymerization of hydroxyethyl acrylate (HEA) in the presence or not of graphene oxide was investigated. Differential scanning calorimetry was used to continuously record the reaction rate under both isothermal and non-isothermal conditions. Simple kinetic models and isoconversional analysis were used to estimate the variation of the overall activation energy with the monomer conversion. It was found that during isothermal experiments, the formation of both inter- and intra-chain hydrogen bonds between the monomer and polymer molecules results in slower polymerization of neat HEA with higher overall activation energy compared to that estimated in the presence of GO. The presence of GO results in a dissociation of hydrogen bonds between monomer and polymer molecules and, thus, to higher reaction rates. Isoconversional methods employed during non-isothermal experiments revealed that the presence of GO results in higher overall activation energy due to the reaction of more functional groups on the surface of GO with the hydroxyl and carbonyl groups of the monomer and polymer molecules, together with the reaction of primary initiator radicals with the surface hydroxyl groups in GO.

scholarly journals Investigation of Hg 1-X Cdx te epitaxial vapor phase growth under isothermal conditions

1999 ◽  
Vol 64 (7-8) ◽  
pp. 463-470 ◽  
Author(s):  
Vesna Jovic ◽  
Zoran Djinovic
Keyword(s):  
Activation Energy ◽  
Vapor Phase ◽  
Type Equation ◽  
Solid State Diffusion ◽  
Phase Growth ◽  
Experimental Conditions ◽  
Isothermal Conditions ◽  
State Diffusion ◽  
Isothermal Growth ◽  
The Given

The Hg 1. x Cd x Te layers were grown by vapor phase epitaxy on Cd-terminated {111} CdTe single crystal substrates from a HgTe solid source under isothermal conditions in a semi-closed system with controlled Hg vapor pressure. The growth kinetics were investigated in the temperature region from 420?C to 550?C with different source to substrate spacings, varying from 1 to 11 mm. It was found that the dependence of the growth rate on temperature could be well described by an Arrhenius type equation with an activation energy of 80 kJ/mol in the investigated temperature interval. The activation energies for the crystallization were the same for all the investigated source to substrate spacing.This activation energy value points to the importance of a solid-state diffusion process in the Hg 1-x Cdx Te/CdTe epitaxial couple obtained by isothermal growth under the given experimental conditions.

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