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Preparation of CoMo/MgO Catalysts for Hydrodesulfurization
Gulková, Daniela ; Kaluža, Luděk ; Zdražil, Miroslav ; Vít, Zdeněk
The aim of the present work was to elucidate the possibility of deposition of molybdenyland cobalt- acetylacetonates on the high surface area MgO by impregnation from solutions of these compounds in methanol. Furthermore, non-aqueous solutions of MoO3 and CoCO3, (NH4)6Mo7O24 and Co(NO3)2, MoO2(C5H7O2)2 and Co(C5H7O2)2 with chelating agent nitrilotriacetic acid (NTA) were studied for CoMo deposition in one impregnation step.
Fulltext: content.csg -  PDF
Plný tet: SKMBT_C22014082908311 - PDF
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Highly Loaded Carbon Black Supported Pt Catalysts for Fuel Cells
Kaluža, Luděk ; Zdražil, Miroslav ; Gulková, Daniela ; Vít, Zdeněk ; Šolcová, Olga ; Soukup, Karel ; Maixnerová, Lucie
The aim of this work was to elucidate on the methods of Pt deposition on carbon black to achieve high loadings of Pt of about 60 wt.% in highly dispersed form. The carbon black supports were characterized by nitrogen physisorption. Platinum was deposited on the supports: from true solutions of H2PtCl6, Pt(C5H7O2)2, Pt(NH3)4(NO3)2, or Pt(NH3)2(NO2)2, and from fine dispersions of Pt(C5H7O2)2, PtO2, Pt(NH3)4(OH)2. Atomic adsorption spectroscopy, AAS, and scanning electron microscopy, SEM, were used for elemental analysis and determination of Pt content. The deposited Pt species were dried, calcined or reduced and were subjected to temperature programmed reduction, TPR. After degassing at increased temperature, the Pt dispersion was determined by hydrogen chemisorption at -60 C.
Fulltext: content.csg - PDF
Plný tet: SKMBT_C22014082908313 - PDF
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6M-IMMEDIATE Research Report: Preparation of Pt on Carbon Black Supported Catalysts
Kaluža, Luděk ; Zdražil, Miroslav ; Gulková, Daniela ; Vít, Zdeněk ; Šolcová, Olga ; Soukup, Karel ; Maixnerová, Lucie
The purpose of the present work is to elucidate on carbon black materials as a support for high loading of Pt in highly dispersed form. There are three main methodologies described in the .literature for deposition of Pt: i) impregnation of the support with solution of well soluble Pt precursors, ii) deposition of a colloidal form of Pt onto the support, and iii) deposition of Pt onto the supports from microemulsion of Pt precursor with the assistance of surfactant. The Pt containing species are deposited either by spontaneous adsorption or by evaporation of the solvent. The deposited platinum compound is transformed to metallic platinum with some chemical or physical (temperature) treatment. Remainders of the deposited compound other than platinum must be removed from the catalysts (for instance by washing, calcination, etc.).
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