Abstract
Developing efficient catalyst for CO oxidation at low-temperature is crucial in various industrial and environmental remediation applications. Herein, we present a versatile approach for controlled synthesis of carbon nitride nanowires (CN NWs) doped with palladium and copper (Pd/Cu/CN NWs) for CO oxidation reactions. This is based on the polymerization of melamine by nitric acid in the presence of metal-precursors followed by annealing under nitrogen. This intriguingly drove the formation of well-defined, one-dimensional nanowires architecture with a high surface area (120 m2 g−1) and doped atomically with Pd and Cu. The newly-designed Pd/Cu/CN NWs fully converted CO to CO2 at 149 °C, that was substantially more active than that of Pd/CN NWs (283 °C) and Cu/CN NWs (329 °C). Moreover, Pd/Cu/CN NWs fully reserved their initial CO oxidation activity after 20 h. This is mainly attributed to the combination between the unique catalytic properties of Pd/Cu and outstanding physicochemical properties of CN NWs, which tune the adsorption energies of CO reactant and reaction product during the CO oxidation reaction. The as-developed method may open new frontiers on using CN NWs supported various noble metals for CO oxidation reaction.
Highlights
Carbon nitride (CN) materials have attracted much great attention in the past few decades, owing to their outstanding physicochemical properties such as great thermal/chemical stability, electric conductivity, and mechanical properties [1,2,3,4,5]
Pd/Cu/carbon nitride nanowires (CN NWs) were typically prepared by the polymerization of melamine by nitric acid in the presence of metal precursors followed by consecutive pyrolysis under nitrogen
The results showed that metal-free CN NWs only converted 8% of CO at 420 ◦ C (Figure 6)
Summary
Carbon nitride (CN) materials have attracted much great attention in the past few decades, owing to their outstanding physicochemical properties such as great thermal/chemical stability, electric conductivity, and mechanical properties [1,2,3,4,5]. CO conversion at 160 ◦ C, which was significantly more active than silica-supported Pt nanoparticles (250 ◦ C) [20] This indicates the significant effect of CN supporter on enhancement the CO oxidation activity of Pt. Recently, the theoretical studies revealed the lower energy barrier for CO oxidation on g-C3 N4 /Pt relative to on pure Pt that originated from the strong electronic interaction between Pt and. We present a versatile approach for precise fabrication of Pd/Cu/CN NWs via the polymerization of melamine by nitric acid in the presence of metal precursors followed by carbonization This drove the formation of one-dimensional nanowires with a great surface area and doped atomically with Pd and Cu. The CO oxidation performance of Pd/Cu/CN NWs was benchmarked relative to Pd/CN NWs, Cu/CN NWs, and CN NWs. The presented method may open new borders on using CN NWs supported metal-based catalysts for CO oxidation
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