Obtaining (Z)-3-hexene with Ni catalysts supported on alumina modified with magnesium precursor

MARÍA JULIANA MACCARRONE; CECILIA R. LEDERHOS; CAROLINA P. BETTI; FERNANDO COLOMA-PASCUAL; CARLOS R. VERA; MÓNICA E. QUIROGA

Kazan

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

The selective hydrogenation of internal alkynes for Z-alkene stereoisomers is applicable in the petrochemical and pharmaceutical industry. This paper evaluates the activity and selectivity of a Ni 1% catalyst in the selective hydrogenation of 3-hexyne modifying the alumina support with a 5 and 10% magnesium precursor with excellent results in conversion values for the reaction time considered. The binding energies for the monometallic nickel catalysts reduced at 673 K can be assigned to electro-deficient nickel species (Nin +, with n close to 2), probably interacting with alumina. The higher values of conversions are obtained at higher reaction temperature. At 303 K, Ni1 % catalyst modified with 5% MgO on alumina presented the highest 3-hexyne total conversions (ca. 100%) and moderate selectivity (70%). Besides this prepared catalyst is inexpensive compared to the Lindlar catalyst (5 wt % of Pd) or others mentioned in the literature.