Abstract
ABSTRACTKetonization of acetic acid was carried out in the gas phase over bulk and supported cobalt–molybdenum catalysts using a fixed-bed reactor. The conditions of the reaction were: 0.2 g of catalyst, 200–400°C, 1 bar pressure, 2 vol% of acetic acid and 20 mL min−1 of nitrogen flow. Bulk and supported catalysts were prepared and calcined at 400°C in N2 flow for 3 h to obtain metal oxides. Both bulk and supported catalysts were tested in the ketonization reaction of acetic acid to form acetone. They have been found active catalysts in this reaction. The catalytic activity was enhanced further by supported catalysts. 20% Co–Mo/Al2O3 catalyst showed superior catalytic performance in the ketonization of acetic acid, with 95% of acetone selectivity at 96% of acetic acid conversion at 380°C, 1 bar and 20 mL min−1 of N2 flow. These materials were characterized by thermogravimetric analysis, nitrogen sorption and FTIR using pyridine adsorption.
Highlights
Biomass is an important renewable feedstock [1]
It has been found that different metal oxides and their supports have been used in the ketonization of carboxylic acids [9,18,19,20,21]
Hossein Bayahia [27] has been reported that Co–Mo and Co–Mo/Al2O3 were active in the ketonization of propionic acid in the gas phase at 200–400°C
Summary
Biomass is an important renewable feedstock [1]. In addition, it is important in replacing fossil fuels which can increase global warming [2]. It has been reported that 20% Ce/Al2O3 and 20% Mn/Al2O3 were the most active catalysts in the ketonization of acetic acid Both of them gave 97% of acetone yield at 350°C. It has been reported that catalytic activity increased by increasing the ketonization temperature In this case, CoO/SiO2 showed the best acetone yield at 450°C which was 68%. Hossein Bayahia [27] has been reported that Co–Mo and Co–Mo/Al2O3 were active in the ketonization of propionic acid in the gas phase at 200–400°C. Co–Mo bulk catalyst and its supported catalysts on Al2O3, SiO2 and TiO2 have been tested in the ketonization of acetic acid in the gas phase using 0.2 g of catalyst, 20 mL min−1 and 2 vol% of acetic acid in the temperature range from 300°C to 400°C and ambient pressure
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