Shape forming of Pt/Al2O3Si sol-gel catalysts for space applications

Amariei, Dan; Rossignol, Sylvie; Kappenstein, Charles; Joulin, Jean-Pierre

doi:10.1016/s0167-2991(06)81004-9

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…Therefore, high-concentration solutions of hydrogen peroxide can be used as a mono-or bipropellant in propulsion systems [5]. Typical materials that are used as active catalyst phase are members of the platinum group (platinum, iridium), which are mainly chemically dispersed on ceramic catalyst beads (e.g., aluminum oxides) [6]. Besides the efficiency of combustion of those catalysts at even ambient temperatures, most of the state-of-the-art catalysts are used in a pre-heated mode.…”

Section: Noble Metals As Active Catalyst In Space Applicationsmentioning

confidence: 99%

Sputtered highly effective iridium catalysts: a new approach for green satellite propulsion

et al. 2021

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This work demonstrated the large potential of sputtered iridium metal for catalytic reactions shown by the example of decomposition of hydrogen peroxide (H2O2) for space propulsion systems. For this purpose, iridium was coated onto Al2O3 pellets by a sputter process under varied process parameters. Depending on previously selected parameters, the obtained metal-loaded pellets offer closed- and/or open-shell structures. Catalytic productivity of these first-generation iridium-sputtered catalysts was estimated in laboratory experiments and compared to platinum-loaded pellets. Under optimized sputter-process conditions, the reactivity is significantly improved compared to the platinum-impregnated pellets. The better catalytic productivity can be explained by the increased active surface area of the iridium layers on the pellets. The surface morphology and the microstructure of the iridium coating can be actively controlled by the sputter pressure. The results are in accordance with the sputtering process pressure tendency described by the Thornton Structure–Zone Model. Graphical abstract

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Section: Noble Metals As Active Catalyst In Space Applicationsmentioning

confidence: 99%