Abstract
The effect of doping with different heteroatoms (N, P, S, and F atoms) on physicochemical properties of reduced graphene oxide (rGO) catalysts and their performances on formaldehyde (HCHO) oxidation is investigated in this study. Nitrogen-doped rGO with a loading of 1 wt% Pt (Pt/N-rGO) sample exhibits a superior HCHO conversion of 82% at a gas hourly space velocity (GHSV) of 50,000 mL/(g × h) at ambient temperature. In addition, the Pt/N-rGO catalyst remained an outstanding activity and stability at room temperature after testing continuously for 48 h. A series of characterization results showed that nitrogen-doping significantly increased the defect degree and specific surface area of rGO compared with rGOs doped with other heteroatoms, promoted the dispersion of Pt nanoparticles (NPs), and produced more zero-valent Pt (Pt0). In addition, the average particle size of the Pt NPs in the samples doping with heteroatoms decreased from 36.4 nm to 4.4 nm. Combined with the results of HCHO-DRIFTS, the highly dispersed Pt NPs on the surface of Pt/N-rGO sample was conducive to activate oxygens and further transfer the formate intermediate.
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