Aspects of stability of K/Al2O3 catalysts for the transesterification of rapeseed oil in batch and fixed-bed reactors

doi:10.1016/S1872-2067(14)60054-1

Abstract

Abstract:

Catalytically active, stable, and mechanically durable solid K/Al₂O₃ catalysts for the transesterification of rapeseed oil with methanol was studied. In a batch reactor, high catalytic activity was accompanied by leaching of K species, caused by glycerol, and mechanical destruction of the solid catalyst as a result of contact with the stirrer. In a fixed-bed reactor, some leaching of K species into the liquid phases was also observed, but approached 0 during 30 h of time-on-stream; the activity of the K/Al₂O₃ catalyst (~83% ester yield) was stable for 100 h of time-on-stream and no mechanical destruction of the catalyst was observed. The populations of K₂O and K-O-Al species for fresh and used K/Al₂O₃ catalysts were compared using Fourier transform infrared spectroscopy. It was found that some K₂O species leached into the liquid phases at the beginning of the reaction.

Key words: Rapeseed oil, Transesterification, Fixed-bed reactor, Potassium, Alumina, Supported catalyst

Petr Kutálek, Libor Čapek, Lucie Smoláková, David Kubička, Martin Hájek. Aspects of stability of K/Al₂O₃ catalysts for the transesterification of rapeseed oil in batch and fixed-bed reactors[J]. Chinese Journal of Catalysis, 2014, 35(7): 1084-1090.

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Aspects of stability of K/Al₂O₃ catalysts for the transesterification of rapeseed oil in batch and fixed-bed reactors

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