III International Conference

USE OF THE NITROGEN-CONTAINING CARBON MATERIALS IN THEENVIROMENTAL CATALYSISPP-III-53Strelko V.V., Zaitsev Yu.P., Zhuravsky S.N., Vlasenko V.M.Institute for Sorption and Problems of Endoecology, NAS of Ukraine, UkraineE-mail: zaitsev@ispe.kiev.uaThe aim of the work is studying of the properties of nitrogen-containing carbon materialsas the carrier in red-ox reactions of the enviromental catalysis. The active carbons (AC-N)SKN, KAU and the active carbon similar in content of nitrogen 1-6 % on mass was study.The introduction of nitrogen in matrix of AC-N results in essential increase of activity ofcatalysts. Dependence of catalytic activity on the content of nitrogen on the carrier hasextreme character. The carbon matrix with 3 mas. % of nitrogen in structure of sample is mostactive.Now carbon materials are widely applied in heterogeneous catalysis, basically, as thecarrier of catalytically active phase. It is caused, first of all, by donor-acceptor properties of acarbon matrix, and, in the second, by suitable structure of the carrier - the high specificsurface, advanced porous structure and an opportunity to vary rather easy these properties.Donor-acceptor properties of a carbon matrix depends on chemistry of a surface of carbonmaterials - structure and amount of surface groups and on presence of heteroatoms instructure of a carbon matrix.Oxidized carbons are manufactured by carbon materials processing by various oxidizers(nitric acid, peroxide of hydrogen, oxygen of air) at high temperatures, or by removal ofsurface oxygen groups at calcination of the samples at high temperatures in the inert gases.Such variation of the structure of surface groups of carbon materials results in change ofdonor-acceptor properties of carbon matrix that should have effect on catalytic properties ofsamples in oxidation-reduction reactions.One more successful way to change donor-acceptor properties of carbon materials isintroduction of heteroatoms (for example, nitrogen) in the structure of a carbon matrix. Thusalso there is a change of donor-acceptor properties of carbon materials which may be used insome reactions of ecological catalysis, such as oxidation of CO and clearing of gases fromhydrogen sulphide with formation of elemental sulfur.Carbon materials in these processes may be used as carriers of active elements or directlyas catalysts.571