Alkyne Selective Hydrogenation with Mono and Bimetallic Anchored Catalysts

CECILIA R. LEDERHOS; CAROLINA BETTI; DOMINGO LIPRANDI; EDGARDO CAGNOLA; MÓNICA E. QUIROGA

New Advances in Hydrogenation Processes - Fundamentals and Applications

InTech

Lugar: Rijeka; Año: 2017; p. 15 - 36

Partial hydrogenation of alkynes has industrial and academic relevanceon a large scale; industries such as petrochemical, pharmacology andagrochemical use these compounds as raw material. Finding an economic, activeand selective catalyst for the production of alkenes via partial hydrogenationof alkynes is thus an important challenge. Mono and bimetallic catalysts(palladium, ruthenium and nickel) were synthetized by the incipient wetnesstechnique using gamma-alumina and an activated carbon as supports. Thecatalysts were characterized by Inductively Coupled Plasma, HydrogenChemisorption, Temperature Programmed Reduction and X-Ray PhotoelectronicSpectroscopy. The objective of this work is to study 1-heptyne selectivehydrogenation using supported catalysts influenced by different factors: a)Pretreatment reduction temperature, b) Reaction temperature, c) Type ofsupport, d) Metal loading, e) Precursor salt and f) Addition of a second metalto monometallic palladium catalyst. The Lindlar commercial catalyst, commonlyused in these types of reactions was used for comparative purposes. XPStechnique allowed verifying that the presence of electron-deficient species onthe catalyst surface with high metal loading affects the conversion andselectivity to the desired product. Nevertheless, the influence of geometricaleffects and/or mixed active sites in the catalysts, as well as metal-metal andmetal-support interactions cannot be neglected.