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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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Direct Decomposition of NO Over Co-Mn-Al Mixed Oxides: Effect of Ce and/or K Promotors.
Jirátová, Květa ; Pacultová, K. ; Karásková, K. ; Balabánová, Jana ; Klegová, A. ; Obalová, L.
In this contribution, the effect of K and/or Ce on activity of Co-Mn-Al mixed oxides was stud-ied, as presence of Ce could increase mobility of oxygen in the transition metals oxides.\n
Cobalt-containing Mixed Oxide Catalysts for Removal of N2O from Nitric Acid Plant Tail Gases.
Obalová, L. ; Pacultová, K. ; Klegová, A. ; Karásková, K. ; Kovanda, F. ; Jirátová, Květa
Presented contribution summarizes our research dealing with cobalt mixed oxide catalysts for low temperature N2O catalytic decomposition.
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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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Cobalt-Containing Mixed Oxide Catalysts for Removal of N2O from Nitric Acid Plant Tail Gases.
Obalová, L. ; Pacultová, K. ; Klegová, A. ; Kovanda, F. ; Jirátová, Květa
Presented contribution summarizes our research dealing with cobalt mixed oxide catalysts for low temperature N2O caalytic deposition.
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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.
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Effect of Precursor Synthesis on Catalytic Activity of Co3O4 in N2O Decomposition
Chromčáková, Ž. ; Obalová, L. ; Kovanda, F. ; Pacultová, K. ; Kukutschová, J. ; Michalik, S. ; Kustrowski, P. ; Jirátová, Květa
The correlation between methods of preparation, phase composition of precursors, catalytic properties of the related oxide catalysts, and the role of the cobalt ions as catalytic active sites is discussed.
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Užití kalcinovaných LDH jako katalyzátorů pro odstranění emisí N2O
Obalová, L. ; Kovanda, F. ; Jirátová, Květa ; Pacultová, K. ; Lacný, Z.
Mixed oxide catalysts were prepared by calcination of LDH containing as divalent ions Ni, Co, Cu and /or Mg and as trivalent ions Mn, Fe and/or Al. The highest conversion was reached over Ni-Al and Co-Mn-Al mixed oxides. N2O conversion decreased slightly with the presence of NO2 over Co-Mn-Al catalyst, but strongly over Ni-Al catalyst. Water vapor inhibited the N2O decomposition over all tested catalysts.

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4 Pacultová, K.