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Article Navigation >  International Journal of Minerals, Metallurgy and Materials  > 2020 > Accepted Manuscript

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Research Article

Comparative Characterization of Iridium Loading on Catalyst Assessment under Different Conditions

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  • Received: 8 January 2020; Revised: 20 March 2020; Accepted: 30 March 2020; Available online: 3 April 2020
  • To discuss the potential role of the iridium (Ir) nanoparticles loaded under conditions at atmospheric and high pressures, we have proceeded to prepare a series of catalysts with the same active phase, but different content of 10, 20, and 30 wt% on gamma alumina for the decomposition of hydrazine. Under atmospheric pressure, the performance of the catalyst was better when using 30 wt% of iridium nanoparticles with chelating agent with a more selectivity of about 27%. The increase of the reaction rate of 175 h-1 to 220 h-1 at the higher iridium loading (30 wt%) is due to a good dispersion of high number active phases rather than an agglomeration surface. On the other hand, as a satisfactory result of this investigation at high pressure, it was found that iridium catalysts with different weight percentages showed the same stability against crushing and activity with a characteristic velocity about 1300 m/s.
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Comparative Characterization of Iridium Loading on Catalyst Assessment under Different Conditions

  • Corresponding author:

    Zahra Amirsardari    E-mail: Z.amirsardari@isrc.ac.ir

  • Space Transportation Research Institute, Iranian space research center, Tehran, Iran
    Received: 8 January 2020
    Revised: 20 March 2020
    Accepted: 30 March 2020
    Available online: 3 April 2020

Abstract: To discuss the potential role of the iridium (Ir) nanoparticles loaded under conditions at atmospheric and high pressures, we have proceeded to prepare a series of catalysts with the same active phase, but different content of 10, 20, and 30 wt% on gamma alumina for the decomposition of hydrazine. Under atmospheric pressure, the performance of the catalyst was better when using 30 wt% of iridium nanoparticles with chelating agent with a more selectivity of about 27%. The increase of the reaction rate of 175 h-1 to 220 h-1 at the higher iridium loading (30 wt%) is due to a good dispersion of high number active phases rather than an agglomeration surface. On the other hand, as a satisfactory result of this investigation at high pressure, it was found that iridium catalysts with different weight percentages showed the same stability against crushing and activity with a characteristic velocity about 1300 m/s.

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