Supported Bimetallic Pt-Pd/Zrvfeti Catalyst for H2 Oxidation and its Enhanced Catalytic Hydrogen Elimination Performance

Abstract

The deflagration of hydrogen in confined spaces is a significant safety concern. To eliminate hydrogen for ensuring safety, we study catalysts for catalytic oxidation of hydrogen at room temperature. Bimetallic Pt-Pd catalyst is prepared on the hydrogen storage alloy ZrVFeTi by the chemical reduction method. The structure, composition, morphology and elemental analyses are characterized using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma-atomic emission spectroscopy (ICP-AES), and its hydrogen elimination performance is also studied. The obtained results show that Pt-Pd/ZrVFeTi bimetallic catalyst displays superior catalytic performance toward H2 oxidation reaction than monometallic Pt/ZrVFeTi or Pd/ZrVFeTi catalyst, which can be attributed to the presence of the PtPd alloyed structures. The Pt-Pd/ZrVFeTi bimetallic catalyst exhibits a high hydrogen conversion of 98.8 % when the hydrogen inlet concentration is 4 vol%, which is higher than 94.3 % for Pd/ZrVFeTi and 91.3 % for Pt/ZrVFeTi. Futhermore, it maintains excellent catalytic activity over 120 mins of the testing experiments, demonstrating remarkable stability. The synergistic effect between Pt and Pd proves beneficial for H2 oxidation reaction.

Keywords: H2 oxidation, ZrVFeTi alloy, Pt-Pd, Bimetallic catalyst, Activity