Formaldehyde is one of the hazardous indoor air pollutants which have harmful effects on humans, domestic animals, and environmental health. The goal of this study was to synthesize a Pt/Al2O3 coated on granular activated carbon (GAC), which is easily recoverable and can be used as an absorbent for formaldehyde removal from polluted indoor air. Moreover, the Pt/Al2O3 catalyst could achieve complete and stable HCHO oxidation at ambient temperature. The characteristic properties of the Pt/Al2O3/GAC sample were analyzed using scanning electron microscopy, energy-dispersive spectrometer, Fourier-transform infrared spectroscopy, and Brunauer–Emmett–Teller techniques. The Pt/Al2O3/GAC catalyst was investigated to determine the catalytic performance with regard to formaldehyde (HCHO) oxidation under different face velocity and initial formaldehyde concentration applicable to a building environment. It was revealed that the removal capacity of Pt/Al2O3 catalyst reached a maximum of 2.23 mg g−1 during 0.1 m s−1 face velocity and 0.75 ppm HCHO inlet concentration. Among zero-, first- and second-order reaction kinetic model, the correlation coefficient of the first-order reaction kinetic model (0.7948 < R2 < 0.9249) and second-order reaction kinetic model (0.6056 < R2 < 0.8146) is lower than zero-order reaction kinetic model (0.9352 < R2 < 0.9921) of Pt/Al2O3 catalyst. The oxidation kinetic of HCHO was well fitted with the zero-order reaction for Pt/Al2O3 catalyst. This study provides some instructions for the design and manufacture of environmentally harmless and cost-effective catalysts with excellent catalytic oxidation properties to remove HCHO at room temperature.
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The authors would like to acknowledge the supports from the Ministry of Science and Technology with contract number 107-3011-F-027-001, National Taipei University of Technology with contract number NTUT-USTB-108-07, and University of Science and Technology Beijing with contract number USTB-NTUT Joint Research Program No. TW2019004.
Conflict of interest
The authors declare that they have no conflict of interest.
Editorial responsibility: Fatih ŞEN.
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Tseng, CH., Chang, SM., Hu, SC. et al. Platinum-supported aluminum oxide on activated carbon filter media for removal of formaldehyde in the indoor condition. Int. J. Environ. Sci. Technol. (2021). https://doi.org/10.1007/s13762-021-03130-7
- Pt/al2O3 catalyst
- Reaction kinetic model
- Air cleaner