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Title: Controlling Reaction Selectivity through the Surface Termination of Perovskite Catalysts

Journal Article · · Angewandte Chemie
ORCiD logo [1];  [2];  [3];  [1];  [4];  [2];  [3]; ORCiD logo [1]
  1. Chemical Sciences Division and Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge TN 37831 USA
  2. Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA
  3. Department of Chemistry University of California Riverside CA 92521 USA
  4. Department of Chemical Engineering Tennessee Technological University Cookeville TN 38505 USA

Abstract 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 SrTiO 3 (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 TiO 2 . 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 BaZrO 3 , thus highlighting the generality of the findings of this study.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-05CH11231; AC05-00OR22725
OSTI ID:
1378295
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 33 Vol. 129; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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