Changes in iridium catalyst activity with different amounts of nanoparticles

Document Type : Original Article

Authors
Zahra Amirsardari 1
Babak Afzali 2
Mohammad Reza Amirsoleimani 3
1 Space Transportation Research Institute
2 Space Transportation Research Institute, Iranian space research center
3 Space Transportation Research Institute, Iranian Space Research Center, Tehran, Iran
10.22034/jssta.2023.376283.1104
Abstract
To discuss the potential effect of iridium (Ir) nanoparticles as an active loaded in atmospheric conditions, we prepared a series of catalysts with the same active phase, but different contents of iridium (10, 15, and 20% by weight) on gamma-alumina for decomposition of hydrazine. The performance of catalyst nanoparticles was better with 15wt% and 20wt% of the Ir particles, and also the selectivity to hydrogen was about 27%. An increase in the reaction rate from 181 h-1 to 218 h−1 was observed in loading 15% by weight of iridium particles due to the good dispersion of the active phases by preventing surface agglomeration. Therefore, as a satisfactory result of this investigation, it was found that Ir catalysts with different weight percentage (15wt% and 20wt%) show the same performance against the activity and selectivity to hydrogen, and are suitable substitutes for each other. Using a catalyst with a lower weight percentage of the active phase and high activity is economically acceptable due to its low cost.
Keywords
Iridium Nanoparticles# Catalyst#Weight percentages# Catalyst Activity
Subjects
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  • Receive Date 12 December 2022
  • Revise Date 06 June 2023
  • Accept Date 17 June 2023