Ag/Al2O3 for glycerol hydrogenolysis to 1,2-propanediol: activity, selectivity and deactivation

A series of -Al 2 O 3 supported silver catalysts (Ag/Al 2 O 3 ) prepared with various Ag loadings and calcination temperatures were used to convert glycerol to 1,2-propanediol. A catalyst with 2 mmol Ag per gram Al 2 O 3 and calcined at 400500 C presented the highest activity (glycerol conversion 46...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Green chemistry : an international journal and green chemistry resource : GC 2012-01, Vol.14 (1), p.156-163
Hauptverfasser: Zhou, Jinxia, Zhang, Jing, Guo, Xinwen, Mao, Jingbo, Zhang, Shuguang
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:A series of -Al 2 O 3 supported silver catalysts (Ag/Al 2 O 3 ) prepared with various Ag loadings and calcination temperatures were used to convert glycerol to 1,2-propanediol. A catalyst with 2 mmol Ag per gram Al 2 O 3 and calcined at 400500 C presented the highest activity (glycerol conversion 46 mol%) and selectivity (96 mol%) at 220 C, glycerol/Ag (molar ratio) = 100/2, 1.5 MPa initial H 2 pressure and 10 h. Optimal prereduction, elevated reaction temperature and hydrogen pressure promote the activity, but the selectivity deteriorates at higher reaction temperatures. Excessive water is detrimental to the performance. Catalyst deactivation was observed, mainly due to Ag sintering under reducing environment. The spent catalyst could be calcined to fully recover the activity. Highly active and selective Ag/Al 2 O 3 catalysts for glycerol hydrogenolysis to 1,2-propanediol deactivate due to Ag sintering and can be fully regenerated by redispersing the metal with a calcination in air.
ISSN:1463-9262
1463-9270
DOI:10.1039/c1gc15918f