scholarly journals EFFECT OF CHEMICAL TREATMENT ON PROPERTIES OF CARBON-MINERAL MATERIALS FROM SAPROPEL

2018 ◽  
Vol 59 (8) ◽  
pp. 90 ◽  
Author(s):  
Elena N. Terekhova ◽  
Alexandr V. Lavrenov ◽  
Oksana I. Krivonos
Keyword(s):  
Water Vapor ◽  
Porous Carbon ◽  
Chemical Treatment ◽  
Alkaline Treatment ◽  
Chemical State ◽  
Molybdenum Catalyst ◽  
Textural Characteristics ◽  
Cobalt Molybdenum Catalyst

We investigated the possibility of producing porous carbon-mineral materials based on sapropel, and also the variation of their textural characteristics and the chemical state of the surface by acidic, alkaline treatment and processing with water vapor. Prepared carbon-mineral-supported cobalt-molybdenum catalyst tested in the reaction of hydrotransformation of 2,4 – dibenzothiophene and α - methylnaphthalene.

Kinetics of the catalytic hydrodesulphurization reaction system; hydrogenolysis of thiophene

1980 ◽  
Vol 45 (10) ◽  
pp. 2728-2741 ◽  
Author(s):  
Pavel Fott ◽  
Petr Schneider
Keyword(s):  
Atmospheric Pressure ◽  
Active Sites ◽  
Flow Reactor ◽  
Kinetic Equations ◽  
Reaction System ◽  
Reaction Products ◽  
Molybdenum Catalyst ◽  
Cobalt Molybdenum Catalyst ◽  
Kinetics Of ◽  
Reaction Schemes

Kinetics have been studied of the reaction system taking place during the reaction of thiophene on the cobalt-molybdenum catalyst in a gradientless circulation flow reactor at 360 °C and atmospheric pressure. Butane has been found present in a small amount in the reaction products even at very low conversion. In view of this, consecutive and parallel-consecutive (triangular) reaction schemes have been proposed. In the former scheme the appearance of butane is accounted for by rate of desorption of butene being comparable with the rate of its hydrogenation. According to the latter scheme part of the butane originates from thiophene via a different route than through hydrogenation of butene. Analysis of the kinetic data has revealed that the reaction of thiophene should be considered to take place on other active sites than that of butene. Kinetic equations derived on this assumption for the consecutive and the triangular reaction schemes correlate experimental data with acceptable accuracy.

scholarly journals Increased Comfort of Polyester Fabrics

Polymers ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 3010
Author(s):  
Meritxell Martí ◽  
Jaime Gisbert-Paya ◽  
Mª Ángeles Bonet-Aracil ◽  
Petar Jovančić ◽  
Manuel J. Lis ◽  
...  
Keyword(s):  
Water Vapor ◽  
Moisture Content ◽  
Microwave Irradiation ◽  
Alkaline Treatment ◽  
Negative Ion ◽  
Experimental Conditions ◽  
Hygroscopic Properties ◽  
Treatment Conditions ◽  
Moisture Increase ◽  
Subsequent Improvement

The hydrophilicity of fibers is directly related to the comfort of a fabric and represents one of the most important aspects of a textile. Therefore, polyester (PES) modification has focused on an increase in moisture content and a subsequent improvement of the user’s experience. Based on the glycerol hygroscopic properties, the main objective has been the enhancement of the hydrophilicity of polyester by glycerol treatments. Furthermore, microwave irradiation and alkaline treatment have been applied, in order to increase glycerol adhesion. Treated PES samples were characterized by performing moisture content, negative ion, water diffusion and water vapor resistance analyses. The effect of different treatment conditions such as bath ratio (1/10 or 1/15), temperature (40, 60 or 100 °C), time (2 or 5 min) and microwave radiation intensity (300 or 500 W) was evaluated. The moisture content of treated PES results indicated that by decreasing the bath ratio and increasing the time and temperature the moisture gain can reach almost 14%, which can be easily related to increases in the weight of the fiber. The treatment with alkali was done and led to the highest moisture increase. Treatment with 500 W microwave irradiation led to higher glycerol retention after rinsing. Different experimental conditions were applied to the glycerol-treated PES fabrics, and a clear improvement in moisture content was obtained increasing the comfort. The results were compared with the ones obtained for cotton and wool, where the moisture is higher than non treated PES.

Activation of a hydrorefining cobalt—molybdenum catalyst

1987 ◽  
Vol 35 (1) ◽  
pp. 23-34 ◽  
Author(s):  
V. Stuchlý ◽  
H. Zahradníková ◽  
L. Beránek
Keyword(s):  
Molybdenum Catalyst ◽  
Cobalt Molybdenum Catalyst

scholarly journals Study of the conditions for the effective initiation of plasma-chemical treatment of flue gas under the influence of a pulsed electron beam

2020 ◽  
Vol 38 (3) ◽  
pp. 197-203 ◽  
Author(s):  
G. Kholodnaya ◽  
I. Egorov ◽  
R. Sazonov ◽  
M. Serebrennikov ◽  
A. Poloskov ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Electron Beam ◽  
Water Vapor ◽  
Flue Gas ◽  
Chemical Treatment ◽  
Drift Chamber ◽  
Gas Mixture ◽  
Plasma Chemical ◽  
Pulsed Electron Beam ◽  
Beam Transmission

AbstractThis paper presents the results of comprehensive studies of the efficiency of a pulsed electron beam transmission through a mixture of gases: nitrogen (83%), carbon dioxide (14%), and oxygen (2.6%) in the presence of ash and water vapor. The studied concentrations correspond to the concentrations of nitrogen, oxygen, and carbon dioxide in flue gas. The pressure and concentration of water vapor and ash in the drift chamber varied (375, 560, and 750 Torr; humidity 15 ± 5% and 50 ± 15%). The charge dissipation of a pulsed electron beam in the gas mixture in the presence of ash and water vapor was investigated, as well as the effect of the concentration of water vapor and ash on the geometric profile of the pulsed electron beam.

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