Hydrous Hydrazine Decomposition for Hydrogen Production Using of Ir/CeO2: Effect of Reaction Parameters on the Activity.

Davide Motta,Alberto Villa,Nikolaos Dimitratos,Silvio Bellomi,Ilaria Barlocco

doi:10.3390/nano11051340

Abstract

In the present work, an Ir/CeO2 catalyst was prepared by the deposition–precipitation method and tested in the decomposition of hydrazine hydrate to hydrogen, which is very important in the development of hydrogen storage materials for fuel cells. The catalyst was characterised using different techniques, i.e., X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), scanning electron microscopy (SEM) equipped with X-ray detector (EDX) and inductively coupled plasma—mass spectroscopy (ICP-MS). The effect of reaction conditions on the activity and selectivity of the material was evaluated in this study, modifying parameters such as temperature, the mass of the catalyst, stirring speed and concentration of base in order to find the optimal conditions of reaction, which allow performing the test in a kinetically limited regime.

Highlights

One of the possible solutions to overcome the main challenges regarding the safety and economy of hydrogen as an energy carrier is the use of liquid-phase chemical hydrogen storage systems for on-board hydrogen production [1]
We report the catalytic performance of Ir/CeO2, synthesised by the deposition-precipitation method, and the effect of reaction conditions on the activity and selectivity of the catalytic decomposition of hydrous hydrazine to hydrogen
This is due to both a larger effect of the experimental error of the blank reaction, which tends to be more stable on longer reaction times, and a general larger relative error that decreases when the value of the measurement increases, with the same absolute error remaining on the measurement over the duration of the reaction

Summary

Introduction

One of the possible solutions to overcome the main challenges regarding the safety and economy of hydrogen as an energy carrier is the use of liquid-phase chemical hydrogen storage systems for on-board hydrogen production [1]. One of the most promising liquidphase hydrogen storage material that has been proposed is hydrous hydrazine [2]. NH2 NH2 has a high hydrogen content of 12.5 wt%, and it is an oily liquid at room temperature. Anhydrous hydrazine decomposes on a series of different materials from noble metals to metal carbides and nitrides, producing a large volume of gas and potentially hydrogen if the temperature reached is high enough, increasing, the risk of fire and explosion during the storage [4]. Hydrazine monohydrate (hydrous hydrazine), despite the addition of one mole of water for each one of hydrazine, maintains a hydrogen content of 7.9 wt%, above most of the requirement for hydrogen storage material, and it is more stable [5].

Methods

Results

Conclusion