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.

甲醛是有害的室内空气污染物之一，会对人类，家畜和环境健康产生有害影响。这项研究的目的是合成一种涂覆在颗粒状活性炭（GAC）上的Pt / Al ₂ O ₃，该活性炭易于回收，可以用作从室内空气中去除甲醛的吸收剂。此外，Pt / Al ₂ O ₃催化剂在环境温度下可以实现完全稳定的HCHO氧化。使用扫描电子显微镜，能量色散光谱仪，傅立叶变换红外光谱和Brunauer-Emmett-Teller技术分析了Pt / Al ₂ O ₃ / GAC样品的特征。铂/铝_研究了2 O ₃ / GAC催化剂，以确定在适用于建筑环境的不同表面速度和初始甲醛浓度下，甲醛（HCHO）氧化的催化性能。结果表明，在0.1 m s ^-1的表面速度和0.75 ppm的HCHO入口浓度下，Pt / Al ₂ O ₃催化剂的去除能力最大为2.23 mg g ^-1。在零，一阶和二阶反应动力学模型中，一阶反应动力学模型（0.7948 < R ²  < 0.9249  ）和二阶反应动力学模型（0.6056 <  R ² <0.8146）低于 Pt / Al ₂ O ₃催化剂的零级反应动力学模型（0.9352 <  R ² <0.9921）。HCHO的氧化动力学与Pt / Al ₂ O ₃催化剂的零级反应非常吻合。这项研究为设计和制造对环境无害且具有成本效益的催化剂提供了一些指导，这些催化剂具有出色的催化氧化性能，可在室温下去除HCHO。