Low Loading and High Activity of Platinum Oxide Nanoclusters Formed by Defect Engineering of a Metal-Organic Framework for Formaldehyde Degradation

Abstract

A distinct platinum oxide nanocluster (PtO_x ) was developed, consisting of only Pt-O bond by a defect-engineered Al metal-organic framework (MOF) (BIT-72) with superior formaldehyde (HCHO) degradation activity and stability. With only 0.015 wt % Pt loading, PtO_x @BIT-72-DE could degrade HCHO with 100 % conversion continuously for at least 200 h under HCHO concentration of 25 ppm and gas hourly space velocity of 60000 mL g^-1 h^-1 at room temperature. Furthermore, its specific rate (446 mmol_HCHO g_Pt ^-1 h^-1 ) was higher than for traditional Pt-based catalysts and single-atom Pt catalysts. Moreover, the cost of PtO_x @BIT-72-DE was lowered to 0.0769 $ g^-1 , which could significantly facilitate its commercial application. This study demonstrates the promising potential of MOFs in the design of HCHO degradation catalysts.

Keywords: defect engineering; formaldehyde; heterogeneous catalysis; metal-organic frameworks; nanoclusters.