TY - JOUR
T1 - Calcium Oxide Supported on Monoclinic Zirconia as a Highly Active Solid Base Catalyst
AU - Frey, A.M.
AU - van Haasterecht, T.
AU - de Jong, K.P.
AU - Bitter, J.H.
PY - 2013
Y1 - 2013
N2 - Calcium oxide supported on ZrO2 is a highly active catalyst for
base-catalyzed reactions such as aldol-type reactions and transesterification
reactions. The role of key parameters during
preparation, that is, impregnation versus precipitation, heat
treatment, and metal oxide loading on the basicity and catalytic
activity were investigated for CaO supported on ZrO2. An impregnation
of 10 wt% CaO on monoclinic zirconia followed by
heat treatment at 6008C resulted in high activity for the selfcondensation
reaction of acetone. An evaluation of a series of
CaO/ZrO2 samples with different loadings showed that the activity
increased for impregnated amounts per gram catalyst of
0–10 wt% CaO, and at higher loading the activity decreased as
a result of a decrease in dispersion. The number of strong base
sites (calculated from CO2 desorbed at temperatures higher
than 625 8C) correlated with the activity. For MgO, CaO, SrO,
and BaO on zirconia the catalytic activity increased as the ionic
radius of the metal cation increased, suggesting the impact of
base strength on catalytic performance.
AB - Calcium oxide supported on ZrO2 is a highly active catalyst for
base-catalyzed reactions such as aldol-type reactions and transesterification
reactions. The role of key parameters during
preparation, that is, impregnation versus precipitation, heat
treatment, and metal oxide loading on the basicity and catalytic
activity were investigated for CaO supported on ZrO2. An impregnation
of 10 wt% CaO on monoclinic zirconia followed by
heat treatment at 6008C resulted in high activity for the selfcondensation
reaction of acetone. An evaluation of a series of
CaO/ZrO2 samples with different loadings showed that the activity
increased for impregnated amounts per gram catalyst of
0–10 wt% CaO, and at higher loading the activity decreased as
a result of a decrease in dispersion. The number of strong base
sites (calculated from CO2 desorbed at temperatures higher
than 625 8C) correlated with the activity. For MgO, CaO, SrO,
and BaO on zirconia the catalytic activity increased as the ionic
radius of the metal cation increased, suggesting the impact of
base strength on catalytic performance.
U2 - 10.1002/cctc.201300676
DO - 10.1002/cctc.201300676
M3 - Article
SN - 1867-3880
VL - 5
SP - 3621
EP - 3628
JO - ChemCatChem
JF - ChemCatChem
ER -