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- Title
Conversion of Ethanol to Butadiene over Binary MgO-SiO 2 Mixed Oxides Prepared by the Ammonia Evaporation Method.
- Authors
Samsudin, Ismail Bin; Jaenicke, Stephan; Chuah, Gaik-Khuan
- Abstract
The ammonia evaporation method, originally applied for the preparation of highly dispersed silica-supported copper catalysts, was used to synthesize magnesia-silica for the one-step conversion of ethanol to 1,3-butadiene. The MgO-SiO2 catalysts obtained by this method contained a high fraction of magnesium silicate hydrates, which are associated with enhanced butadiene selectivity. These catalysts were benchmarked against those prepared by a conventional wet-kneading method. A Mg/Si molar ratio of 4 was optimal, forming butadiene with 37% yield, which is far superior to the 15% yield obtained with MgO-SiO2 formed by wet-kneading. At 475 °C and a WHSV of 3.2 h−1, a productivity of 0.612 gBD gcat−1 h−1 was measured without the catalyst suffering from deactivation, even after 52 h TOS. The catalysts were characterized by spectroscopic and thermal techniques to elucidate their physicochemical properties and explain the differences in the catalytic performance. The presence of magnesium silicate hydrates gave a balance of surface acidity and basicity, which greatly improved butadiene formation. The open morphology of MgO-SiO2 with vertically arranged platelets and the presence of large pores are proposed to contribute to the stability of the catalyst.
- Subjects
BUTADIENE; ETHANOL; COPPER catalysts; MAGNESIUM silicates; AMMONIA; HETEROGENEOUS catalysis
- Publication
Chemistry (2624-8549), 2023, Vol 5, Issue 1, p544
- ISSN
2624-8549
- Publication type
Article
- DOI
10.3390/chemistry5010039