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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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