Janusz Ryczkowski

Hydrogenolysis of n-Butane over Ru/Al2O3 Catalysts

Preliminary studies were undertaken of the preparation parameters of DIM (double impregnation method) influencing metal loading, ruthenium catalyst dispersion and n-butane hydrogenolysis. Ruthenium red was used as the metal precursor of Ru/Al2O3 catalysts. The infrared spectra of ruthenium red and EDTA adsorbed on alumina indicated that interaction occurs between adsorbates and the support surface. An extension of the impregnation time by ruthenium red caused a slight shift of the asymmetric –COO− band that may be explained by interaction between ruthenium and adsorbed EDTA. The small change in the –COO− band position was due to the nature of the metal–EDTA bond formed. An increase in metal loading led to an increase in ruthenium dispersion. Measurements of the rate of hydrogenolysis of n-butane were carried out in a gradientless reactor. All kinetic experiments were conducted under conditions where the hydrogen/n-butane molar ratio was 9:1, and involved isothermal determination of the relationship between the n-butane reaction rate and the corresponding degree of conversion (iso-X). The absence of propane and the presence of isobutane (at lower temperature) among the products were discussed.

Tetrachloromethane as an Effective Agent to Transform Nanoparticles of Palladium and Gold in Supported Catalysts

The use of CCl4 as an effective medium to generate important phase changes in supported Pd and Au catalysts is presented. The dissolution of carbon that originates from CCl4 to form a PdC0.13 solid solution is more complete for the lowest temperature of the CCl4+H2 reaction (30–50 °C). At higher temperatures, the bulk carbiding competes with the hydrogenative removal of bare carbon species to contribute to an enhanced CH4 and C2H6 formation.

Ethylenediaminetetra-acetic Acid (EDTA) Adsorption on a Modified Gamma Alumina Surface

The adsorption of EDTA on a modified γ-alumina support has been investigated by transmission FT-IR. The results allow the conclusion that acidic and alkaline procedures used for γ-Al2O3 modification have an insignificant influence on the EDTA adsorption.

Qualitative Analyses of Iminodiacetic (IDA) and Nitrilotriacetic (NTA) Acids on Alumina by FT-IR

Adsorption of IDA and NTA and their sodium salts on a γ-alumina support has been investigated by transmission FT-IR. The results obtained imply, that the observed changes in the IR spectroscopic properties of the adsorbed chelates are mainly due to interaction of the chelate molecules with alumina hydroxyl groups.