Abstract
Co3O4 particles were supported on a series of activated carbons (G60, CNR, RX3, and RB3). Incipient wetness method was used to prepare these catalysts. The effect of the structural and surface properties of the carbonaceous supports during oxidation of benzyl alcohol was evaluated. The synthetized catalysts were characterized via IR, TEM, TGA/MS, XRD, TPR, AAS, XPS, and N2 adsorption/desorption isotherm techniques. Co3O4/G60 and Co3O4/RX3 catalysts have high activity and selectivity on the oxidation reaction reaching conversions above 90% after 6 h, without the presence of promoters. Catalytic performances show that differences in chemistry of support surface play an important role in activity and suggest that the presence of different ratios of species of cobalt and oxygenated groups on surface in Co3O4/G60 and Co3O4/RX3 catalysts, offered a larger effect synergic between both active phase and support increasing their catalytic activity when compared to the other tested catalysts.
Highlights
The oxidation of alcohols to aldehydes or ketones is one of the most important transformations in fine chemical industry [1] due to the versatility of the carbonyl group [2]
These catalysts were evaluated in the partial oxidation of benzyl alcohol and compared with unsupported Co3 O4
The unsupported active phase Co3 O4 that resulted was less active than the supported oxide, showing that it is important in the distribution, ratio, type, and amount of Co species on the activated carbon support, because the physical-chemical properties of AC as a support have a direct impact over the oxide
Summary
The oxidation of alcohols to aldehydes or ketones is one of the most important transformations in fine chemical industry [1] due to the versatility of the carbonyl group [2]. Sheldon [5] describes the capability of molecular oxygen (O2 ) or hydrogen peroxide (H2 O2 ) as oxidant agents, which are environmental friendly On this way many works have using these oxidants with supported metals such as Pd [6], Pt [7], Rh [8] and Ru [9] as catalysts during the oxidation reactions. Searching for an alternative to the noble metal catalysts, supported Cu [10], Mn [11], Ni [12], or Co [13] oxides has been proposed in the aerobic oxidations of alcohols Within these “low cost” catalyst series, the cobalt-based solids have exhibited high catalytic activity.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
