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Document Type |
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Article In Journal |
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Document Title |
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Halogen poisoning effect of Pt-TiO2 for formaldehyde catalytic oxidation performance at room temperature Halogen poisoning effect of Pt-TiO2 for formaldehyde catalytic oxidation performance at room temperature |
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Subject |
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physics |
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Document Language |
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English |
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Abstract |
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Catalytic decomposition of formaldehyde (HCHO) at room temperature is an important method for
HCHO removal. Pt-based catalysts are the optimal catalyst for HCHO decomposition at room
temperature. However, the stability of this catalyst remains unexplored. In this study, Pt-TiO2 (Pt-P25)
catalysts with and without adsorbed halogen ions (including F-, Cl-, Br-, and I-) were prepared through
impregnation and ion modification. Pt-TiO2 samples with adsorbed halogen ions exhibited reduced
catalytic activity for formaldehyde decomposition at room temperature compared with the Pt-TiO2
sample; the catalytic activity followed the order of F-Pt-P25, CI-Pt-P25, Br-Pt-P25, and I-Pt-P25.
Characterization results (including XRD, TEM, HRTEM, BET, XPS, and metal dispersion) showed that
the adsorbed halogen ions can poison Pt nanoparticles (NPs), thereby reducing the HCHO oxidation
activity of Pt-TiO2. The poison mechanism is due to the strong adsorption of halogen ions on the
surface of Pt NPs. The adsorbed ions form coordination bonds with surface Pt atoms by transferring
surplus electrons into the unoccupied 5d orbit of the Pt atom, thereby inhibiting oxygen adsorption and
activation of the Pt NP surface. Moreover, deactivation rate increases with increasing diameter of
halogen ions. This study provides new insights into the fabrication of high-performance Pt-based
catalysts for indoor air purification |
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ISSN |
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0169-4332 |
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Journal Name |
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APPLIED SURFACE SCIENCE |
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Volume |
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364 |
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Issue Number |
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1 |
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Publishing Year |
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1437 AH
2016 AD |
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Article Type |
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Article |
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Added Date |
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Monday, August 14, 2017 |
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Researchers
| X Zhu | Zhu, X | Investigator | Doctorate | |
| b Chang | Chang, b | Researcher | Doctorate | |
| J Yu | Yu, J | Researcher | | jiaguoyu@yahoo.com |
| W.K Ho | Ho, W.K | Researcher | Doctorate | |
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