Preparation of Pt/Ce-Zr-Y mixed oxide/anodized aluminium oxide catalysts for hydrogen passive autocatalytic recombination

The use of a Pt-based catalyst was evaluated for autocatalytic hydrogen recombination. The Pt was supported on a mixture of Ce-, Zr- and Y-oxides (CZY) to yield nanosized Pt particles. The Pt/CZY/AAO catalyst was then prepared by the spray-deposition of the Pt/CZY intermediate onto an anodized aluminium oxide (AAO) layer on a metallic aluminum core. The Pt/CZY/AAO catalyst (3 x 1 cm) was evaluated for hydrogen combustion (1-8 vol % hydrogen in the air) in a recombiner section testing station. The thermal distribution throughout the catalyst surface was investigated using an infrared camera. The maximum temperature gradient (Delta T) for the examined hydrogen concentrations did not exceed 36 degrees C. The Pt/CZY/AAO catalyst was also evaluated for prolonged hydrogen combustion duration to assess its durability. An average combustion temperature of 239.0 +/- 10.0 degrees C was main-tained for 53 days of catalytic hydrogen combustion, suggesting that there was limited, or no, catalyst deactivation. Finally, a Pt/CZY/AAO catalytic plate (14.0 x 4.5 cm) was prepared to investigate the thermal distribution. An average surface temperature of 212.5 degrees C and a maximum Delta T of 5.4 degrees C was obtained throughout the catalyst surface at a 3 vol% hydrogen concentration. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

The performance and durability of Pt/CZY/AAO catalyst in hydrogen combustion were studied, showing stable average combustion temperature for prolonged periods. Limited or no catalyst deactivation was observed, indicating good potential for practical applications.