(560k) Study on Catalytic Oligomerization of Glycerol over Alumina Supported Ca/La Mixed Oxides
AIChE Annual Meeting
2019
2019 AIChE Annual Meeting
Catalysis and Reaction Engineering Division
Poster Session: Catalysis and Reaction Engineering (CRE) Division
Wednesday, November 13, 2019 - 3:30pm to 5:00pm
In this work,
alumina supported Ca/La mixed oxides as efficient catalysts in oligomerization
of glycerol were successfully prepared by the wetness impregnation method using
La(NO3) and Ca(NO3) solutions as well as boehmite as support,
and followed by calcination at 600 oC. Various instruments including BET, TPD, XRD, SEM, and ICP-OES analysis was
employed for characterization of these catalysts. The catalytic etherification
reaction of glycerol was typically conducted at 240 oC - 280 oC.
In a typical run, the reaction was performed at 250 ¢XC with a catalyst loading of 3 wt%, based on the mass of glycerol
as the sole reactant and the atomic ratio of Ca/La = 2.7 on the catalyst. After
8 hours of catalytic etherification, nearly 75% of the glycerol could be
converted to glycerol oligomers, while the selectivity of di-glycerol and
tri-glycerol over all products was near 87%. The reusability and stability of
the catalyst were tested. It was found that the recovered catalyst still showed
good stability and conversion in two consecutive reactions. After 8 hours, the
reaction still achieves 78% for glycerol conversion and 75% as the selectivity.
initially present
alumina supported Ca/La mixed oxides as efficient catalysts in oligomerization
of glycerol were successfully prepared by the wetness impregnation method using
La(NO3) and Ca(NO3) solutions as well as boehmite as support,
and followed by calcination at 600 oC. Various instruments including BET, TPD, XRD, SEM, and ICP-OES analysis was
employed for characterization of these catalysts. The catalytic etherification
reaction of glycerol was typically conducted at 240 oC - 280 oC.
In a typical run, the reaction was performed at 250 ¢XC with a catalyst loading of 3 wt%, based on the mass of glycerol
as the sole reactant and the atomic ratio of Ca/La = 2.7 on the catalyst. After
8 hours of catalytic etherification, nearly 75% of the glycerol could be
converted to glycerol oligomers, while the selectivity of di-glycerol and
tri-glycerol over all products was near 87%. The reusability and stability of
the catalyst were tested. It was found that the recovered catalyst still showed
good stability and conversion in two consecutive reactions. After 8 hours, the
reaction still achieves 78% for glycerol conversion and 75% as the selectivity.
Keywords: etherification; alumina; glycerol;
di-glycerol; tri-glycerol; catalysts
Reaction conditions:
l Reaction temperature = 250 oC, l Reaction time = 12 h l Catalyst loadings = 3 wt% of glycerolinitially present