Abstract
Two Co/TiO2 catalysts with 7% CoO/g loading were prepared using equilibrium deposition filtration and the dry impregnation method. The two catalysts were characterized with various physicochemical techniques and tested for the degradation of sulfamethaxazole (SMX) using sodium persulfate (SPS) as the oxidant. It was found that the two catalysts exhibit different physicochemical characteristics. The equilibrium deposition filtration (EDF) catalyst had a higher dispersion of cobalt phase, more easily reduced Co(III) species, and a higher ratio of Co(III)/Co(II) species. The interactions between Co-deposited species and the titania surface were monitored with diffuse reflectance spectroscopy in all the preparation steps, and it was found that they increased during drying and calcination, while EDF favored the formation of surface species with strong interactions with the support. Finally, the EDF catalyst was more active for the degradation of sulfamethaxazole due to its better physicochemical characteristics.
Highlights
Cobalt-supported catalysts are quite promising for many reactions of environmental and industrial interest such as volatile organic compounds oxidation [1], CO2 hydrogenation [2], the Fischer–Tropsch process [3,4], and electrocatalysis [5].In the last years, many studies dealt with the cobalt catalysts supported on titania [6,7,8,9]
It should be stated that, generally and for Co catalysts the physicochemical characteristics and the catalytic activity are strongly dependent on the preparation method and the precursor-supported species [10,11,12,13,14]
There are many studies dealing with the preparation of Co/TiO2 catalysts with different methods, the most common method used for the preparation of supported Co catalysts is the dry impregnation (DI) method
Summary
Cobalt-supported catalysts are quite promising for many reactions of environmental and industrial interest such as volatile organic compounds oxidation [1], CO2 hydrogenation [2], the Fischer–Tropsch process [3,4], and electrocatalysis [5].In the last years, many studies dealt with the cobalt catalysts supported on titania [6,7,8,9]. Extensive physicochemical characterization was performed in order to combine the catalytic activity with the physicochemical characteristics At this point, it should be stated that, generally and for Co catalysts the physicochemical characteristics and the catalytic activity are strongly dependent on the preparation method and the precursor-supported species [10,11,12,13,14]. There are many studies dealing with the preparation of Co/TiO2 catalysts with different methods, the most common method used for the preparation of supported Co catalysts is the dry impregnation (DI) method. This is because of its simplicity and low cost, as the other methods used are quite complicated and costly. It is difficult to adjust the impregnation parameters during dry impregnation and to control the mechanism of deposition of active species and the interactions of the supported phase
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