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Measurement of hydrogen storage capacity in Ca72Mg28 alloy

Brestovič T., Jasminská N., Lázár M., Saks K., Bednárová L., Šulíková M., Čarnogurská M.

Advances in Science and Technology. Research Journal

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2017

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Vol. 11, no 4

103--110

EN

This article discusses the measurement of hydrogen storage capacity in Ca72Mg28 alloy that has been produced by melt spinning. The alloy has an amorphous structure in which there is an assumption of hydrogen storage of acceptable concentration. The research is to analyse the possibility of desorption of the gas without recrystallization of the alloy. Subsequently, the problem of reversible hydrogen storage is examined at temperatures between 410–450 °C in the pressure range 0 to 3.5 MPa. This paper deals with the indirect determination of the amount of heat generated in the absorption of hydrogen by using the calorimetric method. In the conclusion there is a comparison of the storage capacity of hydrogen in the amorphous and crystalline structure of the alloy.

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The Influence Of Calcite On The Ash Flow Temperature For Semi-Anthracite Coal From Donbas District

Čarnogurská M., Příhoda M., Pyszko R., Širillová L., Palkóci J.

Chemical and Process Engineering

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2014

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Vol. 35, nr 4

515--525

EN

This paper presents the results of research focused on the lowering of ash flow temperature at semianthracite coal from Donbas district by means of additive (calcite) dosing. Ash fusion temperatures were set for two coal samples (A, B) and for five various states (samples of ash without any additives, with 1%, with 3%, with 5% and with 7% of the additive) in total. The macroscopicphotographic method was used for identifying all specific temperatures. Obtained outputs prove that A type coal has a lower value of sphere temperature than B type coal in the whole scope of percentage representation of the additive. The flow temperature dropped in total from 1489°C to 1280°C, i.e. by 14% during the test of coal of type A with 7% of the additive; while it was near 10% for coal of type B (from 1450°C to 1308°C). Numerical simulations of the process showed that it is not effective to add an additive with a grain size lower than 280 μm by means of wastevapour burners.

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The Effect of Temperature Pyrolysis Process of Used Tires on the Quality of Output Products

Jasminská N., Brestovič T., Čarnogurská M.

Acta Mechanica et Automatica

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2013

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Vol. 7, no. 1

20-25

EN

Pyrolysis together with gasification and combustion create a group of so called thermic processes. Unlike the combustion it is based on thermic decomposition of organic materials without any access of oxidative media. Within the pyrolytic process, three main fractions are created: solid residue, pyrolytic gas and organic liquid product - pyrolytic oil. The presented article examines the effects of pyrolysis operational conditions (above all, temperature) on gas products, solid residues and liquid fractions.