LIQUID-PHASE SELECTIVE HYDROGENATION OF 1-HEPTYNE OVER Ni/Al2O3. EFFECT OF THE REACTION TEMPERATURE

MACCARRONE, J.; LEDERHOS, C.; BADANO, J.; QUIROGA , M.; YORI, J.

Avances en Ciencias e Ingeniería

Comité Editorial de "Avances en Ciencias e Ingeniería"

Lugar: La Serena, Chile; Año: 2011 vol. 2 p. 59 - 68

0718-8706

In this work, the effect of reaction temperature during selective hydrogenation of 1-heptyne to 1-heptene was studied. Supported nickel on alumina was used as catalyst. Different operation temperatures (273, 303 and 323 K) were evaluated. The best behavior was found at the higher reaction temperature, showing high selectivity (c.a. 90 %). The prepared nickel catalyst can be seen as a cheap alternative to industrial level compared to known palladium catalysts due not only to the lower cost of metal but also because of its small metal loading (3,6 % mass). The catalyst was characterized by X-ray diffraction, temperature programmed reduction and X-ray photoelectron spectroscopy. These different techniques indicated the presence of nickel oxide at bulk level with strong interactions with the support and the presence of electron-deficient species of nickel at surface level which were the active species during the hydrogenation of the terminal alkyne.