Untersuchung der Sorption von 1,3‐Butadien und Butenen zur Interpretation der selektiven Butadien‐Hydrierung

Abstract

peroxid (3) zu katalysieren. Daher kann dieser Katalysator seinen Selektivitatsvorteil gegenuber den beiden anderen rnit steigendex Wasserstoffperoxid-Konzentration weiter ausbauen. Im AnschluB an diese MeBreihe wird die Abhangigkeit der Selektivitat vom Wasserstoffpartialdruck bei konstanter Wasserstoffperoxid-Konzentration untersucht. Aus Abb. 5 geht hervor, 80 I 0 -Pd _____ Wasserstoffperoxfdkonzenl~ation 0.37 moll1 PdAuSo --. PdlroQ 70 i a I 30 I 1 I I I 2 4 6 8 Wasserstoflpartialdruck [ bar ]Abb. 5. Abhangigkeit der Selektivitat vorn Wasserstoffpartialdruck; Kat. = 40 mg, 0,l N H2S04 = 160 rnl, NaBr = 0,03 rnmol/l, p = 80 bar, T = 25 "C, Feed 0 2 = 169 rnlN/rnin, Feed H2 = 32,7 rnlN/min.

Selectivity‐Enhancing Effect of a SCILL Catalyst in Butadiene Hydrogenation

“…State‐of‐the‐art catalysts for this reaction contain noble metals, particularly Pd. The high butene selectivity is explained by a different adsorption mode of butadiene on Pd in comparison with the butene isomers 3–6. As long as sufficient butadiene is available on the catalyst surface, butene adsorption is unfavorable and no or little butane forms.…”

On selectivity of catalytic reactions with multi-centered adsorption

“…In general it can be stated that the different number of adsorption sites for reacting molecules can be a possible reason for the high selectivity to the particular product, as in monohydrogenation of organic compounds with double and triple carbon-carbon bonds [5].…”