Abstract
Copper oxide supported on alumina and copper chromite were synthesized, characterized, and subsequently tested for their catalytic activity toward the hydrogenation of octanal. Thereafter, the impact of water addition on the conversion and selectivity of the catalysts were investigated. The fresh catalysts were characterized using X-ray diffraction (XRD), BET surface area and pore volume, SEM, TEM, TGA-DSC, ICP, TPR, and TPD. An initial catalytic testing study was carried out using the catalysts to optimize the temperature and the hydrogen-to-aldehyde ratio—which were found to be 160 °C and 2, respectively—to obtain the best conversion and selectivity to octanol prior to water addition. Water impact studies were carried out under the same conditions. The copper chromite catalyst showed no deactivation or change in octanol selectivity when water was added to the feed. The alumina-supported catalyst showed no change in conversion, but the octanol selectivity improved marginally when water was added.
Highlights
Catalytic hydrogenation reactions are often used in the chemical industry to convert productswith little commercial importance, obtained from other processes, to products with an increased demand and need in the chemical industry [1]
Copper oxide supported on alumina and chromia were synthesized and characterized
The catalysts contained between 24 and 26 wt. % copper, and the BET surface area was higher for the alumina-supported catalyst, both catalysts showed a high degree of reduction under
Summary
Catalytic hydrogenation reactions are often used in the chemical industry to convert productswith little commercial importance, obtained from other processes, to products with an increased demand and need in the chemical industry [1]. Such reactions find applications in the preparation of pharmaceuticals and fine chemicals [2]. Cu has been used in certain instances for the hydrogenation of aldehydes or similar compounds to limit such side reaction products [3,4] Due to their lower activity, Cu catalysts need to operate at higher temperatures
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