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Suppressed Strong Metal–Support Interactions in Platinum on Sulfated Titania and Their Influence on the Oxidation of Carbon Monoxide
Author(s) -
Lee Jaeha,
Song Inhak,
Kim Do Heui
Publication year - 2018
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.201701501
Subject(s) - xanes , catalysis , platinum , carbon monoxide , chemisorption , metal , inorganic chemistry , materials science , sulfation , prox , heterogeneous catalysis , chemistry , chemical engineering , organic chemistry , metallurgy , spectroscopy , biochemistry , physics , quantum mechanics , engineering
Strong metal–support interactions (SMSI), which are evidenced by the coverage of Pt by the TiO 2 support under reducing conditions, were suppressed upon loading Pt on sulfated TiO 2 (S‐TiO 2 ), according to controlled CO chemisorption results. Combined X‐ray diffraction (XRD) and X‐ray absorption near‐edge structure (XANES) studies showed that the Pt species interacted more strongly with the sulfur‐free TiO 2 surface than with the sulfated TiO 2 surface, which thereby facilitated the formation of SMSIs at low temperatures. Weakened interactions between Pt and S‐TiO 2 led to the formation of large Pt clusters with more metallic character. CO oxidation on the Pt/S‐TiO 2 and Pt/TiO 2 catalysts revealed that the temperature for 50 % conversion was lower on Pt/S‐TiO 2 than on Pt/TiO 2 by more than 50 °C. It was concluded that the metal–support interactions between Pt and TiO 2 could be controlled by S species on TiO 2 , and this ultimately influenced the CO oxidation ability of the catalyst.