Abstract
Owing to the outstanding catalytic performance for higher alcohol synthesis, Ga-Co catalysts have attracted much attention. In view of their unsatisfactory stability and alcohol selectivity, herein, K-modulated Co nanoparticles trapped in La-Ga-O catalysts were prepared by the reduction of La1−xKxCo0.65Ga0.35O3 perovskite precursor. Benefiting from the atomic dispersion of all the elements in the precursor, during the reduction of La1−xKxCo0.65Ga0.35O3, Co nanoparticles could be confined into the K-modified La-Ga-O composite oxides, and the confinement of La-Ga-O could improve the anti-sintering performance of Co nanoparticles. In addition, the addition of K modulated parts of La-Ga-O into La2O3, which ameliorated the anti-carbon deposition performance. Finally, the addition of K increased the dispersion of cobalt and provided more electron donors to metallic Co, resulting in a high activity and superior selectivity to higher alcohols. Benefiting from the above characteristics, the catalyst possesses excellent activity, good selectivity, and superior stability.
Highlights
Due to their sufficient combustion and release of less harmful substances during combustion, higher alcohols with 2–6 carbon atoms are regarded as a kind of clean energy [1]
The results show that the addition of K modulates the composition of La-Ga-O, enhances the dispersion of Co, and adjusts the electronic structure of Co, and as a result the catalysts possess excellent catalytic performance
58.8◦ are attributed to the characteristic diffraction peaks of perovskite-type oxide (PTO)
Summary
Due to their sufficient combustion and release of less harmful substances during combustion, higher alcohols with 2–6 carbon atoms are regarded as a kind of clean energy [1]. Due to the high octane number, higher alcohols can be used as a high-quality fuel additive. Ethanol is mainly produced by fermentation and ethylene hydration, while other alcohols are refined from petroleum. In the long run, the above synthesis routes for higher alcohol would be restricted by increasingly depleted petroleum and food [5]. The synthesis of higher alcohols from syngas has attracted much attention, while this process is usually restricted by the low selectivity to higher alcohols and the poor stability of the catalyst
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