Comparative Characterization of Iridium Loading on Catalyst Assessment under Different Conditions

Zahra Amirsardari; Akram Dourani; Mohamad Ali  Amirifar; Nooredin  Ghadiri Massoom; Rahim  Ehsani; Reza  Ghanbarnejad

doi:10.1007/s12613-020-2058-4

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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

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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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.

Comparative Characterization of Iridium Loading on Catalyst Assessment under Different Conditions

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通讯作者: 陈斌, bchen63@163.com

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