期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 33, 页码 9820-9824出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201704656
关键词
acid/base catalysis; dehydration/dehydrogenation; heterogeneous catalysis; perovskites; surface termination
资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
Although perovskites have been widely used in catalysis, tuning of their surface termination to control reaction selectivity has not been well established. In this study, we employed multiple surface-sensitive techniques to characterize the surface termination (one aspect of surface reconstruction) of SrTiO3 (STO) after thermal pretreatment (Sr enrichment) and chemical etching (Ti enrichment). We show, by using the conversion of 2-propanol as a probe reaction, that the surface termination of STO can be controlled to greatly tune catalytic acid/base properties and consequently the reaction selectivity over a wide range, which is not possible with single-metal oxides, either SrO or TiO2. Density functional theory (DFT) calculations explain well the selectivity tuning and reaction mechanism on STO with different surface termination. Similar catalytic tunability was also observed on BaZrO3, thus highlighting the generality of the findings of this study.
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