The ecology of environment nowadays

INVESTIGATION OF ADSORPTION AND CATALYTIC

PROPERTIES OF Cu/ZSM-5 AND Cu/ERIONITE ZEOLITE SYSTEMS

L.P. Oleksenko1, V.K. Yatsimirsky1, I.V. Kuzmich1,

G.M. Telbiz2, A.V. Shvetz2

1Kiev Shevchenko National University, Kiev, Ukraine

2Institute of Physical Chemistry, Ukrainian National Academy of Science,

Nauky avenue 31, 03028 Kiev, Ukraine

Synthetic zeolites are important class of solid materials which are used extensively as catalysts and adsorbents in a variety of chemical reactions and separation processes. The specific properties of ze Continue Reading »

REGENERATION of CARBOXYLIC ACRYLIC CATION‑EXCHANGE RESINS by STOCHIOMETRIC AMOUNT

of a SULFURIC ACID

A.V. Mamchenko, T.I. Yakymova, G.V. Klimova

Institute of Colloid Chemistry and Chemistry of Water, Ukrainian National Academy of Sciences, Vernadsky avenue 42, 03680 Kyiv, Ukraine

The features of carboxylic acrylic cation-exchange resins are their high total exchange capacity, it accounts for 3800 – 4500 mol/m3, and the opportunity of regeneration by stochiometric amount of an acid, including one being in wastes, for example, in the wastewater of H-filters of water des Continue Reading »

SORPTION OF Ni (II) AND Co (II) IONS FROM WATER SOLUTION BY STRONG-ACID CATIONITE Cu-2-8n

A. Kryvoruchko, L. Yurlova, I. Atamanenko, B. Kornilovich

Institute of Colloid Chemistry and Chemistry of Water, Ukrainian National Academy of Sciences, Vernadsky avenue 42, 03680 Kiev-142, Ukraine

Ionic impurities in water lead to arising of several problems in the cooling and heating systems, in the steam generators and in the industrial consumption of water. Ion exchange had got a good acceptance to remove the ionic admixtures due to a number of reasons. So, the ion-exchange resins possess by a high exchan Continue Reading »

Adsorption of Water and Organics

on Microporous Carbons

R. Leboda1, V.M. Gun\’ko2, J. Skubiszewska-Zięba1,

D. Palijczuk3, S. Ziętek3, W.Tomaszewski3

1Faculty of Chemistry, Maria Curie-Sklodowska University, Maria Curie-Sklodowska sq. 3, 20-031 Lublin, Poland

2Institute of Surface Chemistry, Ukrainian National Academy of Sciences, General Naumov st. 17, 03164 Kiev, Ukraine

3Military Institute of Chemistry and Radiometry, 00-910 Warsaw, Poland

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Activated carbons are widely used as technical (for solvent recovery, gas separation, catalysis, etc.) and medicinal adsorbents. Their textural and adsorptive features depend on the carbon origin and treatment (activation) conditions changing not only the pore size distribution (PSD) but also the concentrations of different active surface sites responsible for specific adsorption of polar (electron-donor, electron-acceptor, proton-donor, proton-acceptor) compounds. The micro-, meso- and transport pore distributions and the nature of surfaces of carbons strongly impact the adsorptive characteristics in respect to kinetics and dynamics of adsorption of both polar and nonpolar compounds. Changes in carbon morphology and concentration of surface groups containing oxygen atoms; i.e., alterations in adsorptive capacity, can be elucidated on adsorption of nitrogen (practically pure nonspecific dispersion interaction with carbons to study the PSDs), water (specific interaction with the surface groups containing oxygen atoms) and nonpolar organics (e.g. benzene derivatives) bonded through nonspecific dispersion and specific p-p-electron interaction with carbon surfaces. A variety of initial and treated (oxidized and reduced) microporous carbons (prepared from plum stones and coconut shells) were characterized using adsorption-desorption of nitrogen at 77.4K, adsorption of water (Fig. 1) and tert-butylbenzene (TBB) without and with the presence of water vapor. The adsorption dynamics of TBB changes due to filling of pores by water depending on the PSD.

Fig. 1. Changes in the free energy on water adsorption on initial microporous carbon (EG0), oxidized with H2O2 (30 wt.%) and H2O in an autoclave 623K for 6 h (EG8), and reduced with hydrogen at 1073K for 8 h (EGH)

Acknowledgment

This research was supported by NATO (grant No. EST.CLG.976890), the Polish State Committee for Scientific Research and Ministry of High Education and Science of Ukraine (grant No. 2М/303-99).

STUDIES OF THE ELECTROCHEMICAL ACTIVITY OF THIOBENSOALIDES AT THE MERCUTY ELECTRODE

B. Marczewska, A. Persona

Department of Analytical Chemistry and Instrumental Analysis, Faculty of Chemistry, Maria Curie-Sklodowska University,

Maria Curie-Sklodowska sq. 3, 20-031 Lublin, Poland

So far electrochemical techniques are used very rarely in the investigation of pesticides. The aim of that study has been to test the electrochemical proprieties of 25 (N-phenyl) –2,4-dihydroxybenzenocarbothioamide derivatives with different substitutes at the anilide ring on mercury electrode. Thobensoanilides are known to ha Continue Reading »

INFLUENCE OF PREPARATION CONDITIONS OF MIXED-VALENCE Con+/ZSM-5 ZEOLITES ON THEIR ADSORPTION

AND CATALYTIC PROPERTIES IN CO OXIDATION

L.P. Oleksenko, V.K. Yatsimirsky, L.V. Lutsenko

Kiev Shevchenko National University, Kiev, Ukraine

Search of efficient catalysts for purification of exhaust gases is actually of a great importance. Because Co-containing zeolites are active redox catalysts we consider it interesting to investigate Co/ZSM-5 zeolites with cobalt species in different oxidation states in catalytic reaction of CO oxidation.

The Co-containing ZSM-5 zeolites have been prepared by i Continue Reading »