Journal
CATALYSIS TODAY
Volume 339, Issue -, Pages 220-232Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2019.02.038
Keywords
Support crystalline phase effect; Rutile and anatase TiO2 supports; RuO2/TiO2 catalysts; CO oxidation; Like-disperses-like phenomenon
Funding
- National Natural Science Foundation of China [21666020, 21567016]
- Natural Science Foundation of Jiangxi Province [20181ACB20005, 20171BAB213013, 20181BCD40004, 20181BAB203017]
- Education Department of Jiangxi Province [GJJ150016, GJJ150085, KJLD14005]
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In this study, to investigate the influence of support crystalline phase structure on the dispersion behaviors of the supported metal oxides, tetragonal rutile RuO2 supported on both tetragonal anatase a-TiO2 and tetragonal rutile r-TiO2 supports with different loadings have been prepared, characterized and probed by CO oxidation. It has been discovered that the monolayer dispersion capacity of RuO2 on r-TiO2 support is 0.84 mmol per 100 m(2) surface, which is much higher than 0.15 mmol per 100 m(2) surface on a-TiO2 support. Due to the close matching of the crystalline phase and lattice parameters between RuO2 and r-TiO2 , Ru-O-Ti interfacial bonds can be effectively formed, thus facilitating the RuO2 dispersion and resulting in a high monolayer dispersion capacity. On the contrary, the big difference of the crystalline phase and lattice parameters between RuO2 and a-TiO2 support impedes the formation of Ru-O-Ti interfacial bonds and Ru0 2 dispersion, resulting in a low monolayer dispersion capacity. As a result, RuO2 has a much stronger interaction with r-TiO2 than with a-TiO2 support, which can generate more abundant mobile oxygen sites. Therefore, in comparison with RuO2/a-TiO2 , the intrinsic activity of RuO2/r-TiO2 for CO oxidation is remarkably enhanced. On the basis of the results, it is rational to propose that a like-disperses-like phenomenon is present in the supported metal oxide systems.
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