Multiscale Coupling of Pore Structure Evolution with Decomposition Kinetics of Limestone

The study is aimed at investigating the thermal behavior and decomposition kinetics of torrefied oil palm empty fruit bunches (OPEFB) briquettes using a thermogravimetric (TG) analysis and the Coats-Redfern model. The results revealed that thermal decomposition kinetics of OPEFB and torrefied OPEFB briquettes is significantly influenced by the severity of torrefaction temperature. Furthermore, the temperature profile characteristics; Tonset, Tpeak, and Tend increased consistently due to the thermal lag observed during TG analysis. In addition, the torrefied OPEFB briquettes were observed to possess superior thermal and kinetic properties over the untorrefied OPEFB briquettes. It can be inferred that torrefaction improves the fuel properties of pelletized OPEFB for potential utilization in bioenergy conversion systems.

Download Full-text

Thermal Decomposition Kinetics of Glyphosate (GP) and its Metabolite Aminomethylphosphonic Acid (AMPA)

10.26434/chemrxiv.9860753.v1 ◽

2019 ◽

Author(s):

Milad Narimani ◽

Gabriel da Silva

Keyword(s):

Thermal Decomposition ◽

Reaction Rate ◽

Decomposition Kinetics ◽

Rate Theory ◽

Thermal Decomposition Mechanism ◽

Treatment Processes ◽

Aminomethylphosphonic Acid ◽

Reaction Rate Theory ◽

Decomposition Chemistry ◽

Kinetics Of

Glyphosate (GP) is a widely used herbicide worldwide, yet accumulation of GP and its main byproduct, aminomethylphosphonic acid (AMPA), in soil and water has raised concerns about its potential effects to human health. Thermal treatment processes are one option for decontaminating material containing GP and AMPA, yet the thermal decomposition chemistry of these compounds remains poorly understood. Here, we have revealed the thermal decomposition mechanism of GP and AMPA by applying computational chemistry and reaction rate theory methods. <br>

Download Full-text

Thermal Decomposition Kinetics of γ-AlOOH Nanocrystalline Prepared by Hydrothermal Method

Journal of Inorganic Materials ◽

10.3724/sp.j.1077.2010.00096 ◽

2009 ◽

Vol 25 (1) ◽

pp. 96-100

Author(s):

Qi YANG ◽

Wen-Bin HU

Keyword(s):

Thermal Decomposition ◽

Hydrothermal Method ◽

Decomposition Kinetics ◽

Thermal Decomposition Kinetics ◽

Kinetics Of

Download Full-text

Studies on Thermal Decomposition Kinetics of Polyvinyl Nitrate

Propellants Explosives Pyrotechnics ◽

10.1002/prep.19950200210 ◽

1995 ◽

Vol 20 (2) ◽

pp. 91-95 ◽

Cited By ~ 6

Author(s):

S. C. Mishra ◽

Jyotsna Pant ◽

G. C. Pant ◽

P. K. Dutta ◽

U. C. Durgapal

Keyword(s):

Thermal Decomposition ◽

Decomposition Kinetics ◽

Thermal Decomposition Kinetics ◽

Polyvinyl Nitrate ◽

Kinetics Of

Download Full-text

Thermal Decomposition Kinetics of Ibuprofen and Naproxen Drugs Incorporated in Cellulose Acetate Matrices

Macromolecular Symposia ◽

10.1002/masy.202000156 ◽

2020 ◽

Vol 394 (1) ◽

pp. 2000156

Author(s):

Marcos V. Ferreira ◽

Lauro A. Pradela Filho ◽

Regina M. Takeuchi ◽

Rosana M. N. Assunção

Keyword(s):

Thermal Decomposition ◽

Cellulose Acetate ◽

Decomposition Kinetics ◽

Thermal Decomposition Kinetics ◽

Kinetics Of

Download Full-text

Investigation by Synchrotron Radiation Circular Dichroism of the Secondary Structure Evolution of Pepsin under Oxidative Environment

Foods ◽

10.3390/foods10050998 ◽

2021 ◽

Vol 10 (5) ◽

pp. 998

Author(s):

Laetitia Théron ◽

Aline Bonifacie ◽

Jérémy Delabre ◽

Thierry Sayd ◽

Laurent Aubry ◽

...

Keyword(s):

Circular Dichroism ◽

Synchrotron Radiation ◽

Secondary Structure ◽

Proteolytic Activity ◽

Digestive Enzyme ◽

Structure Evolution ◽

Food Protein ◽

Maldi Tof ◽

Kinetics Of ◽

Circular Dichroïsm

Food processing affects the structure and chemical state of proteins. In particular, protein oxidation occurs and may impair protein properties. These chemical reactions initiated during processing can develop during digestion. Indeed, the physicochemical conditions of the stomach (oxygen pressure, low pH) favor oxidation. In that respect, digestive proteases may be affected as well. Yet, very little is known about the link between endogenous oxidation of digestive enzymes, their potential denaturation, and, therefore, food protein digestibility. Thus, the objective of this study is to understand how oxidative chemical processes will impact the pepsin secondary structure and its hydrolytic activity. The folding and unfolding kinetics of pepsin under oxidative conditions was determined using Synchrotron Radiation Circular Dichroism. SRCD gave us the possibility to monitor the rapid kinetics of protein folding and unfolding in real-time, giving highly resolved spectral data. The proteolytic activity of control and oxidized pepsin was investigated by MALDI-TOF mass spectrometry on a meat protein model, the creatine kinase. MALDI-TOF MS allowed a rapid evaluation of the proteolytic activity through peptide fingerprint. This study opens up new perspectives by shifting the digestion paradigm taking into account the gastric digestive enzyme and its substrate.

Download Full-text

Thermal Stability and Decomposition Kinetics of 1-Alkyl-2,3-Dimethylimidazolium Nitrate Ionic Liquids: TGA and DFT Study

Materials ◽

10.3390/ma14102560 ◽

2021 ◽

Vol 14 (10) ◽

pp. 2560

Author(s):

Jianwen Meng ◽

Yong Pan ◽

Fan Yang ◽

Yanjun Wang ◽

Zhongyu Zheng ◽

...

Keyword(s):

Thermal Stability ◽

Density Functional Theory ◽

Ionic Liquids ◽

Density Functional ◽

Density Functional Theory Calculations ◽

Nitrogen Atmosphere ◽

Decomposition Kinetics ◽

Heating Rates ◽

Functional Theory ◽

Kinetics Of

The thermal stability and decomposition kinetics analysis of 1-alkyl-2,3-dimethylimidazole nitrate ionic liquids with different alkyl chains (ethyl, butyl, hexyl, octyl and decyl) were investigated by using isothermal and nonisothermal thermogravimetric analysis combined with thermoanalytical kinetics calculations (Kissinger, Friedman and Flynn-Wall-Ozawa) and density functional theory (DFT) calculations. Isothermal experiments were performed in a nitrogen atmosphere at 240, 250, 260 and 270 °C. In addition, the nonisothermal experiments were carried out in nitrogen and air atmospheres from 30 to 600 °C with heating rates of 5, 10, 15, 20 and 25 °C/min. The results of two heating modes, three activation energy calculations and density functional theory calculations consistently showed that the thermal stability of 1-alkyl-2,3-dimethylimidazolium nitrate ionic liquids decreases with the increasing length of the alkyl chain of the substituent on the cation, and then the thermal hazard increases. This study could provide some guidance for the safety design and use of imidazolium nitrate ionic liquids for engineering.

Download Full-text