Formaldehyde (HCHO) is an important indoor pollutant. Catalytic oxidize low concentration HCHO is an effective way to eliminate indoor pollution. In this study

a series of Pt/TiO

2

catalysts are prepared by impregnation and reduced by NaBH

4

. The effects of loading amount of Pt and crystal type of TiO

2

on the physical and chemical properties and the catalytic performance in HCHO oxidation reaction are investigated. The results show that the quantity of active site and the oxygen vacancy of catalysts increased with increasing Pt content

which is beneficial to promote the further performance of catalysts. Nevertheless

with the further rises of Pt content

the specific surface area further decreases

and the proportion of Pt

2+

species on the catalyst surface which is significant to catalytic properties also decreases

causing catalytic performance decreases. Compared with the catalyst supporting on rutile

the Pt/a-TiO

2

catalyst supporting on anatase has larger specific surface area

more Pt

2+

phase and easier to form oxygen vacancy in the support

which cause better catalytic performance. The catalyst with Pt content o

f 0.1 wt% and supported by anatase TiO

2

has the best catalytic performance. The HCHO conversion efficiency reaches 98% and 100% at 50 ℃ and 100 ℃

and the stabilization time is longer than 140 h.