Development of novel supported iridium nanocatalysts for special catalytic beds

Zahra Amirsardari,Rahim Ehsani,Mohamad Ali Amirifar,Nooredin Ghadiri Massoom,Akram Dourani

doi:10.1007/s40097-019-00327-8

Zahra Amirsardari, Rahim Ehsani + Show 3 more

Open Access

https://doi.org/10.1007/s40097-019-00327-8

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Abstract

In the present paper, an experimental study of the catalytic decomposition of hydrous hydrazine was investigated on the different structural forms of the catalyst. The synthesized iridium catalysts have been usually used directly and have not been evaluated in the laboratory reactor. This study includes the preparation of iridium-based catalysts supported on spherical (alumina), honeycomb monoliths (cordierite) and foams (alumina) for the evaluation of catalytic activity in the laboratory reactor. The characterizations of these catalysts were evaluated by the TGA, FESEM and BET analysis. The result of the catalytic characterization of monolithic support was shown a homogeneous distribution of active metal without any problem of sintering (average size 25 nm) on the support surface. While the surface of the spherical and foam supports were shown non-uniform distribution of nanoparticles on the support skeleton (average size 55 nm). The monolithic catalyst exhibits higher decomposition rate and H2 selectivity than other supports due to uniform in shape and particle size distribution.Graphic abstract

Highlights

The catalyst efficiency relates to the active phase and carrier effects and the operating properties [1]
The catalyst support plays a key role in enhancing the overall rate of catalytic decomposition, very few comparative studies have been carried out on the efficiency of different catalyst supports in hydrazine decomposition
Because the commercial catalyst for hydrazine decomposition has a spherical form [12,13,14], less has been paid to various forms of catalyst support in the present papers, but in the species such as hydrogen peroxides, there are some reports about the influence of the shape of catalyst support on the decomposition rate [15,16,17]

Summary

Introduction

The catalyst efficiency relates to the active phase and carrier effects and the operating properties [1]. Keywords Iridium nanoparticles · Support shape · Catalyst activity · Laboratory reactor No papers as far as we known have reported the comparative properties of the iridium nanoparticles by introducing iridium ions on the surface of different supports in the area of catalytic decomposition of hydrazine monohydrate.

Results

Conclusion