Effect of hydrogen, and vapors of water and organic compounds on the structure of Sr2CuO3

2021 ◽  
Vol 112 (7) ◽  
pp. 578-583
Author(s):  
Igor B. Bobylev ◽  
Sergey V. Naumov ◽  
Natalia A. Zyuzeva
Keyword(s):  
Water Absorption ◽  
Organic Compounds ◽  
Annealing Atmosphere ◽  
Oxidation Reactions ◽  
Temperature Range ◽  
Hydrolytic Decomposition ◽  
Strontium Hydroxide

Abstract The effect of hydrogen, and vapors of water and the simplest organic compounds of various classes on the structure of strontium orthocuprate (Sr2CuO3) in the temperature range of 150–300 °C has been investigated. At temperatures up to 200 °C, hydrogen and water are embedded in the structure of Sr2CuO3 from the annealing atmosphere. Under these conditions, organic compounds are oxidized to form water followed by hydration of Sr2CuO3. It has been revealed that Sr2CuO3 is a catalyst for oxidation reactions. Water absorption > 2 wt.% provokes hydrolytic decomposition of Sr2CuO3 with the formation of strontium hydroxide and copper-richer cuprates (SrCuO2 and SrCu2O3). At a temperature of 300 °C, organic compounds partially reduce copper, which is also the cause of the decomposition of Sr2CuO3.

scholarly journals Formation of porous ceramics using cullet and biological waste of water purification

2011 ◽  
Vol 43 (1) ◽  
pp. 81-94 ◽  
Author(s):  
M. Vlasova ◽  
I. Rosales ◽  
M. Kakazey ◽  
Parra Parra ◽  
R. Guardian
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Water Purification ◽  
Sintering Temperature ◽  
Porous Ceramics ◽  
Absorption Capacity ◽  
Water Absorption Capacity ◽  
Red Clay ◽  
Temperature Range

Porous ceramics (bricks) was obtained using red clay, milled fusible cullet, and biowaste in the temperature range 950-1000?C. The high content of water in biowaste eliminates the necessity of introducing water in soft mud forming of bricks. The porosity, water absorption capacity, and mechanical properties of the prepared ceramics depend on content of milled cullet and sintering temperature.

scholarly journals STUDY OF EFFECT OF DIFFERENT ORIGIN PIGMENTS ON FRICTIONAL PROPERTIES OF POLYUREA GREASES

2018 ◽  
Vol 59 (7) ◽  
pp. 68
Author(s):  
Vladimir N. Koshelev ◽  
Boris P. Tonkonogov ◽  
Anastasia Yu. Kilyakova ◽  
Karine G. Aleksanyan ◽  
Eldar M. Movsumzade ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Wide Temperature Range ◽  
Chemical Resistance ◽  
Important Task ◽  
High Quality ◽  
Urea Derivatives ◽  
Temperature Range ◽  
Frictional Properties ◽  
High Speeds ◽  
Different Origin

In connection with development of techniques and technologies and unification and substitution the most important task for Russia is to solve the problem of development and introduction of modern high-quality domestic greases. The most suitable in this respect is greases with the urea derivatives thickener — organic compounds containing in molecules one or more urea (urea, wreath) groups. In recent years, the production of these lubricants attracts increased attention of specialists, because they have unique exploitation characteristics: the combination of high-hydrolytic and chemical resistance, operability in a wide temperature range, thermo-strengthening lack, retention its properties at high speeds and specific loads, in contact with adverse environments, etc.  We received greases based on poly urea with the addition of pigment. The synthesized pigments have different structure and belong to different classes of compounds. We conducted a search for the most optimal structures and concentrations of pigments which are included in the poly urea grease.

scholarly journals Application of headspace for research volatile organic compounds emitted from building materials

2018 ◽  
Vol 28 ◽  
pp. 01019
Author(s):  
Beata Kultys ◽  
Karolina Waląg
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Building Materials ◽  
Heating Temperature ◽  
Mineral Wool ◽  
Chromatography Method ◽  
Temperature Range ◽  
Volatile Organic ◽  
Different Temperatures

Headspace technique and gas chromatography method with mas detector has been used for the determination of volatile organic compounds (VOC) emitted from various building and finishing materials, such as sealing foams, mounting strips, paints, varnishes, floor coverings. The tests were carried out for different temperatures (in the temperature range of 60 to 180 °C) and the time of heated vials with tested materials inside. These tests were conducted to verify the possibility of use this method of determination the VOC emission. Interpretation of chromatograms and mass spectra allowed to identify the type of compounds emitted from the tested materials and the optimum time and temperature for each type of material was determined. The increase in heating temperature of the samples resulted in increase the type and number of identified compounds: for four materials the increase was in the whole temperature range, for others it was from 90 °C. On the other hand, emission from mineral wool was low in whole temperature range. 30-minutes heating of the samples was sufficient to identify emitted compounds for most of tested materials. Applying a longer time, i.e. 24 hours, significantly increased the sensitivity of the method.

scholarly journals Investigations of the Temperature Influence on Formation of Compounds from the BTEX Group During the Thermal Decomposition of Furan Resin / Badania wpływu temperatury na powstawanie związków z grupy BTEX podczas termicznego rozkładu żywicy furanowej

2013 ◽  
Vol 13 (2) ◽  
pp. 85-90 ◽  
Author(s):  
M. Kubecki ◽  
M. Holtzer ◽  
S. Żymankowska-Kumon
Keyword(s):  
Thermal Decomposition ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Temperature Influence ◽  
Temperature Range ◽  
Furan Resin ◽  
Volatile Organic ◽  
Synthetic Resins ◽  
Temperature Ranges ◽  
The One

Abstract Organic binders applied in foundry plants based on synthetic resins, from the one side influence obtaining the required technological properties by the moulding sand and - in consequence - obtaining good quality castings, and on the other side are the source of volatile organic compounds (VOC). Together with synthetic resins their hardeners, which although added in very small amounts emit during their thermal decomposition substances negatively influencing the natural environment, are also used. Both, resins and hardeners only at the influence of high temperatures accompanying moulds pouring with liquid metal generate harmful volatile organic compounds including compounds from the BTEX group. Investigations of the temperature influence on the kind and amount of organic compounds formed during the thermal decomposition of selected binders and hardeners and their mixtures allow to determine temperature ranges the most favourable for emitting harmful substances as well as to compare their emission from the selected materials. The aim of this study was the determination the temperature influence on formation substances from the BTEX group, during thermal decomposition of the selected binder, its hardener and their mixture. The BTEX group emission constitutes one of the basic criteria in assessing the harmfulness of materials applied for moulding and core sands and it can undergo changes in dependence of the applied system resin-hardener. Investigations were carried out on the specially developed system for the thermal decomposition of organic substances in the temperature range: 500ºC - 1300ºC, at the laboratory scale. The investigations subject was the furan resin, its hardener and hardened furan resin. The assessment of the emission degree of the BTEX group in dependence of the system subjected to the temperature influence was performed, within the studies. The temperature range, in which maximal amounts of benzene, toluene, ethylbenzene and xylenes were emitted from tested materials - was defined. The qualitative and quantitative analysis of the BTEX group were carried out with using the gas chromatography technique coupled with the mass spectrometry (GC/MS).

Thermoreactivity of Sol-Gel Precursor for ZnO-Based Thin Films

2006 ◽  
Vol 514-516 ◽  
pp. 73-77 ◽  
Author(s):  
Viorica Muşat ◽  
Paula M. Vilarinho ◽  
Regina da Conceição Corredeira Monteiro ◽  
Elvira Fortunato ◽  
E. Segal
Keyword(s):  
Differential Equation ◽  
Thin Films ◽  
Activation Energy ◽  
Thermal Decomposition ◽  
Organic Compounds ◽  
Sol Gel ◽  
Hexagonal Lattice ◽  
Kinetic Investigation ◽  
Temperature Range ◽  
Carbonate Hydroxide

The thermoreactivity of a zinc acetate non-alkoxide solution used for the preparation of ZnO-based thin films was investigated in the temperature range 20-600°C by TG-DTA, XRD and SEM data. We found that the formation in air of ZnO crystallites from the sol-gel precursor occurs above 150°C simultaneously with the decomposition of an intermediary compound, most probably carbonate hydroxide (sclarite and/or hydrozincite). At 200 °C, the crystalline structure is well defined in terms of ZnO hexagonal lattice parameters, although residual organic compounds and water were not yet fully removed and an amorphous phase coexists. A kinetic investigation on the thermal decomposition of sol-gel precursor from DTA data using Kissinger differential equation is also presented. Apparent activation energy values of about. 100 kJ mol-1 corresponding to the nonisothermal decomposition of solid precursors in the temperature range 170-250oC have been found.

Some characteristics of oxidation reactions of organic compounds on platinum electrodes

1964 ◽  
Vol 9 (7) ◽  
pp. 869-882 ◽  
Author(s):  
V.S. Bagotzky ◽  
Yu.B. Vasilyev
Keyword(s):  
Organic Compounds ◽  
Platinum Electrodes ◽  
Oxidation Reactions

Organic Compounds Thermal Conductivity in the Liquid Phase: A Prediction Method in the Temperature Range From the Melting Point to Near the Critical Temperature

2010 ◽  
Author(s):  
Giovanni Latini ◽  
Marco Sotte
Keyword(s):  
Thermal Conductivity ◽  
Critical Temperature ◽  
Melting Point ◽  
Organic Compounds ◽  
Golden Ratio ◽  
Prediction Method ◽  
Temperature Range ◽  
Experimental Values ◽  
Two Parameters ◽  
Reduced Temperature

In this work a new equation for liquid thermal conductivity prediction is proposed; its goal is to overcome the existing relations’ limitations, being reliable for many compounds in a wide temperature range and requiring few parameters to be used. The equation allows thermal conductivity calculation along or near the saturation line by the knowledge of the reduced temperature and two parameters characteristic of the organic family and of the single investigated compound. Also the “golden ratio” appears in the formula and an investigation on this number is carried out, proposing it as a characteristic value of the liquid state. The results of the formula’s test on the best available experimental values of more than 120 organic compounds, belonging to 13 different families (including the most used refrigerants) are presented. In the investigated reduced temperature range (going from the melting point to close the critical temperature, Tr = 0.30 ÷ 0.95) mean absolute deviations between calculated and experimental thermal conductivity data are generally less than 3% and maximum ones usually close to 8%.

scholarly journals The use of pyridinium fluorochromate (PFC)supported on trisyl silica gel for oxidation reactions

2007 ◽  
Vol 72 (2) ◽  
pp. 129-132 ◽  
Author(s):  
Fatma Aydin ◽  
Ersan Turunc
Keyword(s):  
Organic Compounds ◽  
Silica Gel ◽  
Co Adsorption ◽  
Oxidation Reactions ◽  
Pyridinium Fluorochromate

Pyridinium fluorochromate supported on TriSyl silicas was prepared by co-adsorption. The supported reagent was used in equimolar quantity to oxidise some organic compounds with good yields and complete selectivity. These procedures are mild, efficient, safe and the work-ups are very convenient. .

Breakthrough characteristics of volatile organic compounds in the −10 to +170°C temperature range on Tenax TA determined by microtrap technology

2004 ◽  
Vol 1038 (1-2) ◽  
pp. 215-223 ◽  
Author(s):  
Antonı́n Kroupa ◽  
Jo Dewulf ◽  
Herman Van Langenhove ◽  
Ivan Vı́den
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Temperature Range ◽  
Volatile Organic
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