Pd/CaCO3 as an alternative of Lindlar classic catalyst for alkyne hydrogenation

MISAEL CÓRDOBA ARROYO; M. JULIANA MACCARRONE; CAROLINA P. BETTI; FERNANDO COLOMA-PASCUAL; MÓNICA E. QUIROGA; CECILIA R. LEDERHOS

Beijing

Congreso; The 16th International Congress on Catalysis; 2016

The alkyne partial hydrogenation using homogeneous and heterogeneous catalysts have been widely studied in the last years due to its academic and industrial interest. One of the most studied systems is the Lindlar catalyst (Pd/CaCO3 modified with Pb(OAc)2), since 1953. Other catalysts, mono and bimetallic, as well as several transition metal complexes have been proposed. The objective of this work is the synthesis of an active and selective catalyst for the selective hydrogenation of a long chain alkyne. Pd/CaCO3 was prepared from an amonia palladium complex and compared with the Lindlar classical catalyst.Two catalysts based in palladium on CaCO3 were compared and evaluated during the selective hydrogenation of 1-heptyne. One of them was synthetized in the laboratory from an amino complex solution of palladium and deposited on the support by incipient wetness technique. Another them is the Lindlar commercial catalyst. A low loaded Pd/CaCO3 catalyst was prepared from an amino complex. The synthesized catalyst presented higher initial reaction rate than the commercial Lindlar catalyst with higher selectivity to 1-heptene, 90 %. Higher activity of the prepared catalyst might be related to a higher dispersion.