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Comparative characterization of iridium loading on catalyst assessment under different conditions

International Journal of Minerals,Metallurgy and Materials 2021年第7期28卷 1233-1239页

作者： zahra amirsardari Akram Dourani Mohamad Ali Amirifar Nooredin Ghadiri Massoom Space Transportation Research Institute Iranian Space Research CenterTehranIran

To discuss the potential role of iridium(Ir)nanoparticles loaded under atmospheric and high pressures,we prepared a series of cata-lysts with the same active phase but different contents of 10wt%,20wt%,and 30wt%on gamma-alumina for decomposition of ***-der atmospheric pressure,the performance of the catalyst was better when 30wt%of the Ir nanoparticles was used with chelating agent that had greater selectivity of approximately 27%.The increase in the reaction rate from 175 to 220 h^(−1)at higher Ir loading(30wt%)was due to a good dispersion of high-number active phases rather than an agglomeration *** a satisfactory result of this investigation at high pressure,Ir catalysts with different weight percentages showed the same stability against crushing and activity with a characteristic velocity of approxim-ately 1300 m/s.

关键词： iridium nanoparticles catalyst activity laboratory reactor atmospheric pressure high pressure

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Influence of ZrB2 Nanoparticles on the Mechanical and Thermal Behaviors of Carbon Nanotube Reinforced Resol Composite

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Journal of Materials Science & Technology 2016年第7期32卷 611-616页

作者： zahra amirsardari Rouhollah Mehdinavaz-Aghdam Masoud Salavati-Niasari Mohammad Reza Jahannama Institute of Nano Science and Nano Technology University of Kashan. Kashan. Iran Department of Nanotechnology. Space Transportation Research Institute Iranian Space Research Center Tehran lran

The present study focuses on the thermal response of carbon fiber-reinforced phenolic composites, where the matrix has been modified with different reinforcements. Two types of materials, multiwalled carbon nanotubes and zirconium diboride （ZrB2）, were used in a new design of mixture to produce the heat- resistant ablative composite system. The CNT/ZrB2/carbon/phenolic nanocomposite （Z/NT-CR） system corresponding to CNT/carbon/phenolic nanocomposite （NT-CR） showed a reasonable decrease in mass loss and the ablation rate as compared to carbon/phenolic composite （CR）. However, substantial drop in two factors was found for Z/NT-CR as compared to carbon/phenolic and NT-CR. Ablation mechanisms for all three composites were investigated by thermal gravimetric analysis in conjunction with micro- structural studies using a field emission scanning electron microscope. The microstructural studies revealed that CNTs acted as an ablation resistant phase for protection against 2000 ℃, and the conversion from ZrB2 to ZrO2 played an important role as an insulator in the performance of char layer in the ablation resistance.

关键词： Multiwalled carbon nanotubes (MWCNTs)Zirconium diboride nanoparticles (ZrB2)Carbon/phenolic compositeThermal stabilityAblation performance

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