III International Conference

PP-II-94THE INFLUENCE OF FORMING CONDITIONS OF Ce,- Ag- AND Co-CONTAININGZEOLITE SUPPORTED CATALYSTS ON THEIR ACTIVITY IN CO OXIDATIONOleksenko L.P, Yatsimirsky V.K., Lutsenko L.V., Chen YueTaras Shevchenko Kiev National University, Kiev, UkraineЕ-mail: olexludmil@ukr.net, yats@univ.kiev.uaCatalytic activity in CO oxidation of Ce-, Ag- and Co-containing systems supported withzeolites was investigated. It was established that systems with high metal content (10wt.% Ce,10wt.% Ag) formed at T = 20 – 700 °C had high activity in reaction mixture with oxygenexcess (1% СО+20% О 2 +79% Не). The sample Ag-NaX displayed the highest activity amongthe investigated Ag-catalysts (T form. = 20 – 700 °C). Optimum conditions of previoustreatment of Ag-Co-NaX with low silver content were found. It was shown the Ag-Co-NaXcatalysts (T form. = 20 – 350 °C) had more high activity in comparison with 10% Ag-NaX.Metal-containing (Ag, Au, Pt, Pd, 3d-metals) and oxide (Co 3 O 4 , CeO 2 , CuO, MnO 2 )systems deposited on ceramics, zeolites and oxides supports – Al 2 O 3 , TiO 2 , ZrO 2 – are widelyinvestigated in catalytic CO oxidation [1-3]. Increased attention is paid to the supportedAg-based catalysts in the connection because of their stable activity in oxidation processes.On the other hand, the investigation of zeolites as carriers for obtaining supported catalysts isperspective since their developed structure can cause a definite distribution of activecomponents, the increasing of their content in surface layer and, consequently, activityincreasing. High thermal stability of zeolites can provide for a stable activity of catalysts ontheir base in particular in reaction of CO oxidation.In this paper the activity of Се-, Ag- and Co-loaded systems supported on zeolites andformed under different conditions was investigated in CO oxidation. Co-, Се- and Ag-loadedcatalysts with high content (10 mas.%) were prepared by impregnation of granulated zeolites(size of granulas was 0,5 - 1 mm) with Се(NO 3 ) 2 , Со(NO 3 ) 2 and AgNO 3 solutions. Themeasure of activity was temperature of total conversion of CO (T 100 ).The investigation showed that Ce-loaded catalysts (10 mas.% Ce) had high activity in COoxidation – total conversion of carbon monoxide was reached in I and II cycles of catalysisfor all samples. Full conversion of СО on sample 10% Се-NaX in the I catalysis cycle wasfixed at 346 °C, and it was at 328 °C in the II cycle. The activity of 10% Се-catalysts on thebase of NaA, Na,K-ERI, NaZSM-5 (SiO 2 /Al 2 O 3 = 37 and 69) and NaM was greatly higher –the temperature of CO total conversion on these catalysts was about 100 °C lower incomparison with 10% Се-Na. It was established that a zeolite nature didn’t noticeablyinfluence on activity of Ce-systems (T 100 lied in the range of 237 – 248 °C).333