High-surface area mesoporous Pt/TiO2 hollow chains for efficient formaldehyde decomposition at ambient temperature

Lifang QI, Bei CHENG, Jiaguo YU, Wing Kei HO

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Abstract

Room-temperature catalytic decomposition of formaldehyde (HCHO) is considered as one of the most main methods for the removal of indoor HCHO due to its facile reaction conditions. Herein, high-surface area mesoporous Pt/TiO2 hollow chains were synthesized in high yield by using a simple microwave–hydrothermal route, followed by a combined NaOH-assisted NaBH4-reduction deposition of Pt nanoparticles on the as-obtained TiO2 surface. The catalytic activity for HCHO decomposition was evaluated at room temperature. The prepared Pt/TiO2 hollow chains with an optimal Pt loading of 0.5 wt% exhibited high catalytic activity and recyclability. The apparent reaction rate constant of HCHO oxidation over this catalyst was approximately 1.42×10−3 ppm−1 min−1, exceeding that of the commercial Degussa P25 TiO2 with equal Pt content (k = 5.36×10−4 ppm−1 min−1) by a factor of approximately 2.65. The high catalytic activity of the Pt/TiO2 hollow chains could be mainly attributed to the hollow chain-like structure, high specific surface area, numerous mesopores, and high pore volume of TiO2 support. Consequently, the catalysts exhibited high adsorption capacity for HCHO, fast diffusion and transport of gas molecules, and good contact between gases and active sites. These characteristics enhanced the catalytic activity. Copyright © 2015 Published by Elsevier B.V.
Original languageEnglish
Pages (from-to)522-530
JournalJournal of Hazardous Materials
Volume301
Early online dateSep 2015
DOIs
Publication statusPublished - 2016

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formaldehyde
Formaldehyde
Catalyst activity
surface area
Gases
catalyst
decomposition
Decomposition
Temperature
gas
Nanoparticles
reaction rate
Adsorption
Catalytic Domain
temperature
adsorption
oxidation
Catalysts
Catalyst supports
Specific surface area

Citation

Qi, L., Cheng, B., Yu, J., & Ho, W. (2016). High-surface area mesoporous Pt/TiO2 hollow chains for efficient formaldehyde decomposition at ambient temperature. Journal of Hazardous Materials, 301, 522-530.

Keywords

  • Catalytic oxidation
  • HCHO removal
  • Mesoporous TiO2
  • Hollow spheres
  • Indoor air quality