Nashrieh Shimi va Mohandesi Shimi Iran

Nashrieh Shimi va Mohandesi Shimi Iran

Investigating the Effect of Cobalt to Aluminum Ratio on the Structure and Activity of Spinel CoAl2O4 Supported by Sulfate Group in the Esterification Process

Document Type : Research Article

Authors
Amir Hosein Azmoon 1
Ali Ahmadpour 1
Naser Saghatoleslami 1
Hamed Nayebzadeh 2
Alireza Heydari 3
1 Department of Chemical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, I.R. IRAN
2 Faculty of Material and Chemical Engineering, Esfarayen University of Technology, Esfarayen, Iran
3 1Department of Chemical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, I.R. IRAN
Abstract
In this research, the effect of cobalt to aluminum ratio on the physico-chemical properties of spinel CoAl2O4 was investigated. Spinal cobalt aluminate was synthesized by solution combustion method and supported by sulfate groups to investigate its activity in the esterification process. The catalysts were synthesized with molar ratios of cobalt to aluminum of 1, 1.25, 1.5 and 1.75 and were characterized by XRD, FTIR, BET, FESEM and EDS analyses. The results showed that the ratio of cobalt to aluminum at 1.5 caused a suitable crystal structure, high surface area (43.6 m2/g). In addition, this sample showed a porous structure and the surface of the catalyst provided the possibility of better interactions between reactants. As a result, the conversion rate of 95.2% in the esterification reaction at 105 °C, the molar ratio of 9 alcohol to fatty acid, 3 wt.% of catalyst to fatty acid and the duration of 4 h were obtained. Finally, the reusability of the catalyst was evaluated, and the results showed that only leaching of the active phase of sulfate group was the reason of the reduction of the catalyst activity, and the spinel structure of CoAl2O4 has high stability.
Keywords
Spinel
Cobalt
Aluminum
Combustion synthesis
Esterification reaction

Subjects

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