Selectivity patterns in heterogeneously catalyzed hydrogenation of conjugated ene-yne and diene compounds

摘要: Abstract Selectivity control in heterogeneously catalyzed hydrogenation of conjugated hydrocarbons (ene-yne and diene compounds) is a challenging task. Available studies on the topic mainly encircle 1,3-butadiene as substrate palladium catalyst, while more elaborated playground molecules other metals remain largely unexplored. This study investigates gas-phase valylene (2-methyl-1-butene-3-yne) isoprene (2-methyl-1,3-butadiene) over Pd, Pb-poisoned CO-modified Cu, Ni, bimetallic Cu Ni catalysts. Chemoselectivity, regioselectivity, full hydrogenation, C bond formation/scission footprints catalytic systems at different inlet hydrogen-to-hydrocarbon ratios conversion degrees have been rationalized. Complementary 3-methylbutyne 1-penten-4-yne were carried out order to analyze (i) impact isomerization observed mono-olefin distribution valylene/isoprene (ii) conjugation issue partial ene-yne hydrogenation. Our results lead an improved understanding polyunsaturated open doors design selective heterogeneous catalysts related processes for this practically important class reactions.