Surface Microstructure Modulation Strategy to Design an Amphiphobic Platinum Nanocatalyst for Efficient Catalytic Oxidation of Hydrogen Isotopes

Abstract

Security risks of hydrogen isotopes in hydrogen energy sections and nuclear projects require systems to remove hydrogen isotopes. The oxidation of hydrogen isotopes in a system depends on the efficiency of the catalyst. However, the performance of the catalyst is often reduced by water and volatile organic compounds (VOCs) present in the air. In this study, a surface microstructure modulation strategy is adopted to prepare honeycomb Pt catalysts with an amphiphobic surface (Pt@CDM) for the efficient oxidation of hydrogen isotopes. The surface microstructure of the honeycomb carrier is modulated by surface roughening and postfluorination. The optimized substrate shows a water contact angle of 138.9°and a contact angle of 125.4°with n-hexadecane. Pt@CDM exhibits a much higher H 2 /D 2 conversion than commercial catalysts in a wet environment with VOCs. Additionally, Pt@CDM can retain a catalytic efficiency of more than 95% after 83.5 h of continuous working and intermittent operation. The isotope effect on the oxidation of H 2 and D 2 (K F,H2 /K F,D2 ) is 1:0.88, which is much lower than that of most of the other catalysts and indicates the good catalytic performance of tritium oxidation. This work demonstrates a surface microstructure modulation technology to improve catalytic performance and will also be a strategy for designing efficient catalysts in a practical environment.

Insight into the Catalytic Oxidation Mechanism of Hydrogen Isotopes by Pt Clusters Confined by Silicalite-1

“…Xu et al. employed a surface microstructure modulation approach to fabricate a honeycomb Pt catalyst featuring an amphiphobic surface (Pt@CDM), which was designed for efficient hydrogen isotope oxidation . Remarkably, this material retained a catalytic efficiency of ≥95% even after continuous working and intermittent operation for 83.5 h. Improving the dispersion and stability of metal clusters in catalysts is an effective strategy to improve catalytic performance.…”

Platinum Nanoparticles Anchored on Covalent Triazine Frameworks Modified Cordierite for Efficient Oxidation of Hydrogen Isotopes

“…The metal–support interaction effect indicates that the structure of the support can significantly affect the activity of the catalyst . Based on this effect, hydrophobic substrates have been designed for Pt loading to reduce the deactivation induced by water. , Huang et al designed a hydrophobic Pt/PTFE catalyst for water–hydrogen isotope exchange . Due to the hydrophobic polytetrafluoroethylene supports, Pt/PTFE showed a stable liquid phase catalytic exchange in water.…”