摘要：采用直接沉淀还原法制备了新型TiO₂负载型铂基催化剂,并对该催化剂在甲醛室温完全催化氧化净化反应中的活性、稳定性和适用性进行研究。结果表明:当铂负载量(质量分数)仅为0.10%时,制备的催化剂即可在室温使甲醛净化率达到97%,而且在50 h的稳定性测试中,甲醛净化率始终维持在95%以上;同时该催化剂在甲醛质量浓度为3~50 mg/m3和空气湿度为36%~90%较大变化范围内,也可使甲醛室温净化率始终在90%以上。通过表面形貌和粒径分布分析可知,催化剂中活性组分铂颗粒以2~5 nm粒径尺度在TiO₂载体表面均匀分散,这应该是该催化剂表现出优越甲醛室温催化净化能力的主要原因。

关键词：甲醛；催化净化；铂基催化剂

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