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Co-Mn-Al mixed oxides promoted for direct NO decomposition: preparation and properties.
Jirátová, Květa ; Pacultová, K. ; Balabánová, Jana ; Karásková, K. ; Klegová, A. ; Bílková, T. ; Jandová, Věra ; Koštejn, Martin ; Martaus, A. ; Kotarba, A. ; Obalová, L.
The catalysts investigated in this work were prepared by co-precipitation of nitrates with aqueous K2CO3/KOH solution, followed by washing the precipitates to varying degrees of potassium content and calcining the precursors at 500 °C for 4 h. Mn-Al potassium salt followed by calcination at 500 °C. Before the catalytic reaction, they were calcined at 700 °C. The catalysts and their precursors were characterized by the following measurement techniques: ICP, DTG, XRD, N2 physisorption, FTIR, H2-TPR, CO2-TPD, XPS, and thermal alkali metal desorption (SR-TAD).\n\n
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Activity of K-Promoted Co-Mn-Al Mixed in Direct Decomposition of No and Deep Oxidation of Ethanol.
Jirátová, Květa ; Balabánová, Jana ; Pacultová, K. ; Karásková, K. ; Klegová, A. ; Obalová, L.
In this study, Co-Mn-Al mixed oxides modified by K were prepared by co-precipitation of a solution of metal nitrates with the aqueous solution of K2CO3 and KOH, washing the precipitates to different level of K concentrations and finally calcined at chosen temperature, usually 500 °C. The catalysts were characterized by AAS, nitrogen physisorption (Sbet), TPR-H2, XRD, and TPD- CO2. In case of direct NO decomposition, the catalysts pre-calcined at 700 °C were tested for direct NO decomposition in inert gas (650 °C, 0.5 g, 1000 ppm NO/N2, 49 ml min"1). Deep oxidation of ethanol was carried out under following conditions: 0.2 g, 760 ppm of ethanol in air, 4 000 ml h'1, the temperature ramp of 2 °C min'1.
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Catalytic Activity of Cobalt Impregnated on Ordered Mesoporous Silica Materials in N2O Decomposition.
Kuboňová, L. ; Fridrichová, D. ; Peikertová, P. ; Mamulová Kutláková, K. ; Kozubová, S. ; Jirátová, Květa ; Obalová, L. ; Cool, P.
Three different ordered mesoporous silica materials, such as MCM-41, Al containing MCM-41 (mass ratio Si/Al = 10) and SBA-15, were prepared. In a next step, cobalt (5-8 wt%) as an active metal for redox reactions, was introduced by the impregnation. The prepared catalysts were characterized by AAS, EDX, N-2 physisorption, XRD, DR UV-Vis spectroscopy, Raman spectroscopy, TPR-H-2 and their catalytic properties were evaluated for N2O decomposition and reduction. The catalysts showed poor activity in N2O decomposition while the use of reducing agent (carbon monoxide) was beneficial for their catalytic activities. The lowest catalytic activity showed Co/Al-MCM indicating that the aggregated CoxOy species present in this catalyst were inactive and not beneficial for the catalytic activity.
Fulltext: content.csg - PDF
Plný tet: NANOCON 2015 - PDF
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Co3O4 Supported on Different Supports for N2O Decomposition.
Klyushina, A. ; Pacultová, K. ; Jirátová, Květa ; Obalová, L.
In this work Co3O4 catalysts supported on different kind of shaped supports (rings, quadrulobes) were prepared by incipient wetness impregnation method. As support materials commercial supports made of MgAl oxides, Al2O3 and TiO2 were used. The catalysts were characterized by AAS, XRD, Raman, FTIR, SEM, H2-TPR and nitrogen adsorption methods and tested for nitrous oxide decomposition.
Fulltext: content.csg - PDF
Plný tet: SKMBT_C22016090211341 - PDF
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