Selective Hydrogenation of Hexanoic Acid to Hexanol Under Mild Conditions over Titania-Based Pt-Re Catalyst
XII European Congress on Catalysis “Catalysis: Balancing the use of fossil and renewable resources” (EuropaCat-XII)
30 Aug - 4 Sep 2015
||EuropaCat XII. Catalysis: Balancing the use of fossil and renewable resources. XII European Congress on Catalysis. Kazan (Russia). 30th Aug. - 4th Sept., 2015 : Book of Abstracts
Boreskov Institute of Catalysis. Novosibirsk.2015.
2184 c. ISBN 9785906376107.
Boreskov Institute of Catalysis SB RAS
Novosibirsk State University
The Pt-ReOx species (x ≤ 1) of atomic dispersion were formed and stabilized on the titania surface. Their size, charge and chemical composition were characterized by means of HRTEM/STEM with EDX mapping, XPS, FTIR. It was shown these centers with Re:Pt = 2 are highly active and selective in hydrogenation of carboxylic acid to alcohol under very mild conditions (T = 110 C, P = 50 bar). The reaction rate constant for hydrogenation of hexanoic acid increased linearly with Pt content. As for Ru-NPy pair in homogeneous pincer-type complexes, the neighboring Pt-O atoms form a similar pair capable to dissociate H2 heterolytically with generation of Pt hydride to hydrogenate the carbonyl group of acid. Indeed, the TOF (40 h-1) and selectivity (99%) are approaching those of homogeneous catalyst. The first order kinetic model described well the kinetic data obtained in a wide range of reaction conditions.