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Influence of the Precipitation Method on Acid–Base‐Catalyzed Reactions over Mg–Zr Mixed Oxides
Author(s) -
Kozlowski Joseph T.,
Behrens Malte,
Schlögl Robert,
Davis Robert J.
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.201200833
Subject(s) - coprecipitation , catalysis , transesterification , chemistry , cubic zirconia , inorganic chemistry , acetone , methanol , butanol , nuclear chemistry , ethanol , organic chemistry , ceramic
To examine the promotional effect that zirconia has on magnesia in catalysis, mixed oxides were prepared by coprecipitation under controlled‐pH conditions or rising‐pH conditions. The resulting mixed oxides were characterized by using NH 3 and CO 2 adsorption microcalorimetry, X‐ray diffraction, and scanning electron microscopy. The samples were also tested as catalysts for transesterification of tributyrin with methanol, coupling of acetone, and conversion of ethanol to ethene, ethanal, and butanol. Zirconia promoted the activity of MgO for both transesterification and acetone coupling reactions, presumably by exposing new acid–base pairs at the surface. During ethanol conversion, however, zirconia promoted the dehydration reactions. Characterization and reactivity results suggest that a Mg‐Zr sample prepared by controlled‐pH precipitation exposes more ZrO 2 than a sample prepared by the rising‐pH method.