1-Alkyne selective hydrogenation with Pd/AC catalysts. Effect of precursor salt.

C.R. LEDERHOS; CRISTIAN MIRANDA; CAROLINA BETTI; J.M. BADANO; M.J. MACCARRONE; NICOLÁS CARRARA; F. COLOMA-PASCUAL; E. CAGNOLA; M.E. QUIROGA

Kazan

Congreso; 12th European Congress on Catalysis - EuropaCat-XII; 2015

The carbonaceous materials are widely used as catalyst supports in different industrial reactions. The catalysts supported on activated carbon (AC) have advantages over other material: low cost, stability, mechanical strength, high surface area, ability to modify their surface chemistry, etc. [1]. Olefins obtained by hydrogenation of alkynes, are of great academic and industrial interest, either for the synthesis of biologically active compounds, in the production of margarine industry for lubricants, plastic, etc., also presenting fine chemical applications. The objectives of this work are: a) to prepare low loading palladium catalysts supported on activated carbon, using chloride and nitrate as precursor salts, and b) to evaluate them as catalyst during the liquid phase selective hydrogenation of 1-heptyne to 1-heptene.Two palladium catalysts were synthesized from different precursor salts (chloride and nitrate) on activated carbon with 0.4 wt% Pd. PdN/CNR showed the best performance in activity and selectivity during the selective hydrogenation of 1-heptyne to 1-heptene. The characterization results show that the treatment with HNO3 during the preparation step of PdN/CNR modified the support surface. The best performance of PdN/CNR can be attributed to the high concentration of active species Pd° on the surface of the support catalyst. It is possible that the remaining chlorine in PdCl/CNR interacts as a poison, decreasing the total conversion.