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Spectroscopic studies of alumina supported nickel catalysts precursors: Part II - catalysts prepared from alkaline solutions

Spectroscopic studies of alumina supported nickel catalysts precursors: Part II - catalysts prepared from alkaline solutions

Nickel alumina supported catalysts were prepared from alkaline solutions of hexaamminenickel nitrate by CIM and DIM methods (classical and double impregnation, respectively). The catalysts exhibited different nickel species due to the existence of various metal-support interaction strengths. As a consequence, the reducibility and other surface properties changed as a function of the preparation method. The aim of this work was to study the interaction between the metal precursor and alumina surface by means of FT-IR (Fourier transform infrared) and FT-IR/PAS (FT-IR photoacoustic spectroscopy).

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Synthesis and characterization of Pt/CeOx systems for catalytic CO oxidation reaction

Synthesis and characterization of Pt/CeOx systems for catalytic CO oxidation reaction

Four different ceria supported catalyst were prepared by impregnation method with Pt(NO3)2 solution. The two supports are commercially available (MaTeck) and the other two were prepared by precipitation and microwave assisted hydrothermal method (MAH) respectively. The phase composition and average crystallite size of the catalysts were characterised with XRD technique. Finally the catalytic activity in CO oxidation reaction were determined in plug flow reactor in temperature range 300-900 K with 1 K resolution. The catalysts obtained in both precipitation and MAH methods exhibit catalytic activity at room temperature whereas catalysts obtained on MaTeck supports are not active at those conditions. In turn, catalysts based on MaTeck support are more active in temperature range 420-700 K. The different activities are attributed to difference in average crystallite sizes and in support morphology.

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Scientific co-operation with professor Nazimek

). D. Nazimek, J. Ryczkowski, Influence of the crystallite size of platinum on the course of the hydrogenolysis and isomerization of n-butane over Pt/Al 2 O 3 catalysts, React. Kinet. Catal. Lett. , 40, 137 (1989). D. Nazimek, J. Ryczkowski, Influence of the crystallite size of platinum on the course of the hydrogenolysis of ethane and propane over Pt/Al 2 O 3 catalysts, React. Kinet. Catal. Lett. , 40, 145 (1989). J. Ryczkowski, D. Nazimek, Influence of organic reagents on nickel alumina supported catalysts. I

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Scientific co-operation with professor Borowiecki

. Gołębiowski, T. Borowiecki, Study of nickelmolybdenum alumina supported catalysts by temperature-programmed reduction method, Heterogeneous Catalysis , Proceedings of the 9 th International Symposium (L. Petrov, Ch. Bonev, G. Kadinov, Eds.), 23-27 September 2000, Varna, Bulgaria, Institute of Catalysis, Bulgarian Academy of Sciences (ISBN 954-90193-3-0), Sofia, pp 417-422 (2000). J. Ryczkowski, J. Goworek, T. Borowiecki, W. Gac, S. Pasieczna, Thermochim. Acta , 434, 2 (2005). J. Ryczkowski, T. Borowiecki, D. Nazimek

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