Controlling Reaction Selectivity through the Surface Termination of Perovskite Catalysts
Autor: | Shize Yang, Matthew F. Chisholm, Zili Wu, Elizabeth E. Bickel, Victor Fung, Felipe Polo-Garzon, De-en Jiang, Guo Shiou Foo |
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Rok vydání: | 2017 |
Předmět: |
Reaction mechanism
Materials science Chemistry Inorganic chemistry General Medicine 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Heterogeneous catalysis 01 natural sciences Isotropic etching Catalysis 0104 chemical sciences Metal Chemical engineering visual_art visual_art.visual_art_medium Density functional theory 0210 nano-technology Selectivity Surface reconstruction Perovskite (structure) |
Zdroj: | Angewandte Chemie International Edition. 56:9820-9824 |
ISSN: | 1521-3773 1433-7851 |
Popis: | 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. |
Databáze: | OpenAIRE |
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