Platinum-supported aluminum oxide on activated carbon filter media for removal of formaldehyde in the indoor condition
2021
Tseng, C.-H. | Chang, S.-M. | Hu, S.-C. | Chen, Y.-C. | Shiue, A. | Li, Z. | Huang, P. H. | Leggett, G.
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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