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Aspects of stability of K/Al2O3 catalysts for the transesterification of rapeseed oil in batch and fixed-bed reactors
Year: 2014
Type of publication: článek v odborném periodiku
Name of source: Chinese Journal of Catalysis
Publisher name: Science China Press
Place: Beijing
Page from-to: 1084-1090
Titles:
Language Name Abstract Keywords
cze Aspekty stability katalyzátorů K/Al2O3 pro transesterifikaci řepkového oleje ve vsádkovém reaktoru a v reaktoru s pevným ložem Byl studován katalyticky aktivní, stabilní a mechanicky odolný pevný K/Al2O3 katalyzátor. Katalyzátor byl testován ve vsádkovém reaktoru a v reaktoru s pevným ložem. řepkový olej; transesterifikace; reaktor s pevným ložem; vsádkový reaktor; K; Al2O3; katalyzátor
eng Aspects of stability of K/Al2O3 catalysts for the transesterification of rapeseed oil in batch and fixed-bed reactors Catalytically active, stable, and mechanically durable solid K/Al2O3 catalysts for the transesterification of rapeseed oil with methanol 1,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 (similar to 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. Rapeseed oil; Transesterification; Fixed-bed reactor; Potassium; Alumina; Supported catalyst

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