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Calcium Oxide Supported on Monoclinic Zirconia as a Highly Active Solid Base Catalyst
Author(s) -
Frey Anne Mette,
van Haasterecht Tomas,
P. de Jong Krijn,
Bitter Johannes Hendrik
Publication year - 2013
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201300676
Subject(s) - catalysis , cubic zirconia , monoclinic crystal system , inorganic chemistry , oxide , chemistry , base (topology) , calcium oxide , materials science , organic chemistry , crystal structure , mathematical analysis , ceramic , mathematics
Calcium oxide supported on ZrO 2 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 ZrO 2 . An impregnation of 10 wt % CaO on monoclinic zirconia followed by heat treatment at 600 °C resulted in high activity for the self‐condensation reaction of acetone. An evaluation of a series of CaO/ZrO 2 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 CO 2 desorbed at temperatures higher than 625 °C) 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.