scholarly journals Thermal analysis of building materials for decoration and INFRARED spectroscopy of gaseous products of their thermal destruction

2021 ◽  
pp. 119-123
Author(s):  
Е.В. Чернушевич ◽  
М.Ю. Принцева ◽  
П.В. Ширинкин ◽  
Ю.Н. Безбородов
Keyword(s):  
Thermal Analysis ◽  
Infrared Spectroscopy ◽  
Thermogravimetric Analysis ◽  
Heat Flow ◽  
Building Materials ◽  
Thermal Destruction ◽  
Chemical Compounds ◽  
Gas Cell ◽  
Gaseous Products ◽  
Analysis Instrument

В настоящей статье представлены результаты экспериментального исследования термической деструкции отделочных строительных материалов и идентификации продуктов их термического разложения. Исследование термической деструкции отделочных строительных материалов осуществлялось методом динамического термогравиметрического анализа, а идентификация продуктов термического разложения отделочных строительных материалов – методом инфракрасной спектроскопии. Термический анализ проводился на приборе синхронного термического анализа NETZSCH STA 449 F3 Jupiter, позволяющем фиксировать изменение массы и величин теплового потока от температуры. Нагрев образцов осуществлялся со скоростью 10℃/мин в атмосфере воздуха с расходом 100 мл/мин в интервале температур 25℃-650℃. Образующиеся при термической деструкции газообразные продукты анализировались на ИК-Фурье спектрометре «ФСМ 1201» с газовой кюветой ТГА 100 при длинах волн 600-4500 см-1. По результатам исследования получены ТГ, ДТГ и ДСК-кривые, характеризующие соответственно потерю массы образца, скорость потери массы и изменение величины теплового потока от температуры, а также ИК-спектры продуктов термической деструкции отделочных строительных материалов при различных температурах. Установлено, что отделочные строительные материалы при их термической деструкции образуют различные химические соединения, отдельные из которых представляют опасность для организма человека. This article presents the results of experimental research on thermal destruction of finishing building materials and a hazard assessment of the process. Thermal destruction of finishing materials was investigated by thermal analysis and the risk of the process was assessed by infrared spectroscopy of gaseous products resulting from thermal destruction. The thermal analysis was carried out by dynamic thermogravimetric analysis on the synchronous thermal analysis instrument NETZSCH STA 449 F3 Jupiter, which makes it possible to detect changes in mass and heat flow from temperature. The heating of the samples was carried out at a rate of 10 ℃/min in the atmosphere with a consumption of 100 ml/min. The gaseous products formed during thermal destruction were analyzed by infrared spectroscopy on IR-Fourier spectrometer «FSM 1201» with gas cell TGA 100 at wavelengths of 600-4500 cm-1. The results of the study led to the production of TG, TFG and DSK curves, describing respectively the loss of sample mass, the rate of mass loss and the change of heat flow from temperature as well as infrared spectra of products of thermal destruction of finishing building materials at various temperatures. It has been found that the finishing building materials, when thermally disrupted, form various chemical compounds, some of which are dangerous to the human body.

scholarly journals Bis(N′-(3-chlorobenzoyl)isonicotinohydrazide)iron(III) Complex

Molbank ◽  
10.3390/m1101 ◽  
2019 ◽  
Vol 2020 (1) ◽  
pp. M1101
Author(s):  
Richa Mardianingrum ◽  
Susanti ◽  
Ruswanto Ruswanto
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Fourier Transform ◽  
Differential Thermal Analysis ◽  
Infrared Spectroscopy ◽  
Thermogravimetric Analysis ◽  
Title Compound ◽  
Ethanol Solution ◽  
Visible Spectroscopy ◽  
Uv Visible

The bis(N′-(3-chlorobenzoyl)isonicotinohydrazide)iron(III) complex was synthesised from N′-(3-chlorobenzoyl)isonicotinohydrazide and iron(III) metal by reflux in an ethanol solution. The title compound was characterised by Fourier-transform infrared spectroscopy (FTIR) spectroscopy, differential thermal analysis/thermogravimetric analysis (DTA/TGA) and UV-visible spectroscopy. The results indicate that coordination of the iron(III) ion to the ligand increased its thermal stability.

Kinetics of temperature-programmed reactivation of a hydrodesulphurization catalyst

1983 ◽  
Vol 48 (12) ◽  
pp. 3340-3355 ◽  
Author(s):  
Pavel Fott ◽  
Pavel Šebesta
Keyword(s):  
Carbon Dioxide ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Thin Layer ◽  
Kinetic Parameters ◽  
Diffusion Region ◽  
Reaction Heat ◽  
Gaseous Products ◽  
Temperature Programmed ◽  
Kinetics Of

The kinetic parameters of reactivation of a carbonized hydrodesulphurization (HDS) catalyst by air were evaluated from combined thermogravimetric (TG) and differential thermal analysis (DTA) data. In addition, the gaseous products leaving a temperature-programmed reactor with a thin layer of catalyst were analyzed chromatographically. Two exothermic processes were found to take part in the reactivation, and their kinetics were described by 1st order equations. In the first process (180-400 °C), sulphur in Co and Mo sulphides is oxidized to sulphur dioxide; in the second process (300-540 °C), in which the essential portion of heat is produced, the deposited carbon is oxidized to give predominantly carbon dioxide. If the reaction heat is not removed efficiently enough, ignition of the catalyst takes place, which is associated with a transition to the diffusion region. The application of the obtained kinetic parameters to modelling a temperature-programmed reactivation is illustrated on the case of a single particle.

Synthesis, Characterisation and Structural Studies of [Zn(phen)3][Fe(CN)5(NO)]·2H2O·0.25MeOH and [(bipy)2(H2O)Zn(μ-NC)Fe(CN)4(NO)]·0.5H2O

2003 ◽  
Vol 58 (9) ◽  
pp. 916-921 ◽  
Author(s):  
Amitabha Datta ◽  
Samiran Mitra ◽  
Georgina Rosair
Keyword(s):  
Infrared Spectroscopy ◽  
Thermogravimetric Analysis ◽  
Octahedral Geometry ◽  
Distorted Octahedral Geometry ◽  
Structural Studies ◽  
Crystal Lattices ◽  
X Ray ◽  
X Ray Crystallography ◽  
Distorted Octahedral ◽  
Solvent Molecules

Two new bimetallic complexes [Zn(phen)3][Fe(CN)5(NO)] · 2 H2O · 0.25 MeOH, (1) and [(bipy)2(H2O)Zn(μ-NC)Fe(CN)4(NO)] · 0.5 H2O, (2), have been isolated (where phen = 1,10-phenanthroline and bipy = bipyridyl) and characterised by X-ray crystallography [as the 2 H2O · 0.25 CH3OH solvate for (1) and hemihydrate for (2)] infrared spectroscopy and thermogravimetric analysis. Substitution of phenanthroline for bipyridyl resulted in a cyano-bridged bimetallic species rather than two discrete mononuclear metal complexes. The bond angles of Fe-N-O were shown to be practically linear for both 1 [179.2(7)°] and 2 [178.3(3)°], and the Zn atoms have distorted octahedral geometry. The solvent molecules in both crystal lattices take part in forming hydrogen-bonded networks.

scholarly journals Valorization of Byproducts of Hemp Multipurpose Crop: Short Non-Aligned Bast Fibers as a Source of Nanocellulose

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 4723
Author(s):  
Sara Dalle Vacche ◽  
Vijayaletchumy Karunakaran ◽  
Alessia Patrucco ◽  
Marina Zoccola ◽  
Loreleï Douard ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Thermogravimetric Analysis ◽  
Cannabis Sativa ◽  
Crystallinity Index ◽  
Residual Lignin ◽  
Chemical Pretreatment ◽  
X Ray Diffraction ◽  
X Ray ◽  
Bast Fibers ◽  
Seed Maturity

Nanocellulose was extracted from short bast fibers, from hemp (Cannabis sativa L.) plants harvested at seed maturity, non-retted, and mechanically decorticated in a defibering apparatus, giving non-aligned fibers. A chemical pretreatment with NaOH and HCl allowed the removal of most of the non-cellulosic components of the fibers. No bleaching was performed. The chemically pretreated fibers were then refined in a beater and treated with a cellulase enzyme, followed by mechanical defibrillation in an ultrafine friction grinder. The fibers were characterized by microscopy, infrared spectroscopy, thermogravimetric analysis and X-ray diffraction after each step of the process to understand the evolution of their morphology and composition. The obtained nanocellulose suspension was composed of short nanofibrils with widths of 5–12 nm, stacks of nanofibrils with widths of 20–200 nm, and some larger fibers. The crystallinity index was found to increase from 74% for the raw fibers to 80% for the nanocellulose. The nanocellulose retained a yellowish color, indicating the presence of some residual lignin. The properties of the nanopaper prepared with the hemp nanocellulose were similar to those of nanopapers prepared with wood pulp-derived rod-like nanofibrils.

scholarly journals Investigation of the Behavior and Mechanism of Action of Ether-Based Polycarboxylate Superplasticizers Absorption on Large Bibulous Stone Powder

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2736
Author(s):  
Zuiliang Deng ◽  
Guimin Lu ◽  
Lefeng Fu ◽  
Weishan Wang ◽  
Baicun Zheng
Keyword(s):  
Infrared Spectroscopy ◽  
Thermogravimetric Analysis ◽  
Zeta Potential ◽  
Mechanism Of Action ◽  
Water Consumption ◽  
Pore Volume ◽  
High Water ◽  
Hydrodynamic Diameter ◽  
Coarse Aggregates ◽  
Polycarboxylate Superplasticizer

The aim of this paper is to study the adsorption behavior of polycarboxylate superplasticizers (PCE) on coarse aggregates with a property of high water consumption (above 2%). The coarse aggregates were ground into a powder to create large bibulous stone powder, and it was observed that significant amounts of the ether-based PCE were absorbed onto large bibulous stone powder. The adsorption rate immediately reached a maximum after 5 min and then gradually decreased until an equilibrium absorption was established after 30 min. Zeta potential, infrared spectroscopy, and thermogravimetric analysis (TGA) measurements confirmed that the polycarboxylate superplasticizer adsorbed on the surface of the stone powder. Hydrodynamic diameter measurements showed that the polycarboxylate superplasticizer molecules were smaller than pore size, and the surface area and pore volume were reduced by the polymer incorporation in the pores.

scholarly journals Thermogravimetric analysis of empty fruit bunch

2018 ◽  
Vol 225 ◽  
pp. 02002 ◽  
Author(s):  
Girma T. Chala ◽  
Ying P. Lim ◽  
Shaharin A. Sulaiman ◽  
Chin L. Liew
Keyword(s):  
Thermogravimetric Analysis ◽  
Heat Flow ◽  
Loss Rate ◽  
Renewable Energy Sources ◽  
Thermal Reaction ◽  
Maximum Temperature ◽  
Empty Fruit Bunch ◽  
Weight Loss Rate ◽  
Minimum Heat ◽  
Maximum Weight Loss

This paper presents the characteristics of empty fruit bunch (EFB) using thermogravimetric analysis (TGA) and shows its potential as a renewable energy sources. A set of data were collected from the thermal reaction and plotted in mass or percentage of the initial mass against either temperature or time, respectively. In the thermogravimetric analysis, mass, temperature and time were considered as base measurements and important data for derivative thermogravimetric (DTG) curve were analysed while many additional measures could be derived from these three base measurements. It was observed that heating rate of 8.5°C/min and air flow rate of 85mL/min provided a maximum weight loss rate of 0.209%/°C at the temperature of 313.5°C and the derivative weight peak of -0.1895mg/°C at 292°C. The time taken to reach the maximum temperature of 899.9°C was 46.74 minutes, and ΔT endo-up reflected minimum point of -0.2°C at 15.82 minutes and maximum ΔT endo-up of 888°C at 42 minutes. Heat flow endo-up also showed that the minimum heat flow was 15.39mW at 15.85 minutes and reaching the peak heat flow endo-up of 47.73mW at 43.27 minutes.

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