Abstract：The new TiO₂ supported Pt-based catalysts were prepared by direct precipitation and reduction method. And the activity, stability and applicability of the as-prepared catalysts in formaldehyde catalytic purification at room temperature were also studied. The results show that the suitable Pt loading is as low as0.10%, over which the removal efficiency of formaldehyde can reach 97% and also keep above 95% during the stability test for 50 h.Meanwhile, the formaldehyde removal efficiency on the as-synthesized catalysts remains above 90%, while the inlet formaldehyde concentration and inlet relative humidity varies in the range of 3 ~50 mg/m~3 and 36% ~90% respectively. Further from the analysis of TEM and size distribution of Pt particles, it can be found that the active Pt particles are uniformly dispersed on the surface of TiO₂ supporter with small particle size of 2~5 nm,which results in the extinguished formaldehyde catalytic purification performance at room temperature.

Keywords: formaldehyde; catalytic purification; Pt-based catalyst