Comparison of HTP catalyst performance for different internal monolith structures

Koopmans, Robert-Jan; Nandyala, Varun; Pavesi, Sara; Batonneau, Yann; Beauchet, Romain; Maleix, Corentin; Schwentenwein, Martin; Spitzbart, Manfred; Altun, Altan Alpay; Scharlemann, Carsten

doi:10.1016/j.actaastro.2019.07.010

Cited by 9 publications

(3 citation statements)

References 5 publications

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“…The interaction between ceramics particles at high temperatures induces densification via sintering and, consequently, fully dense ceramics are formed [28,29]. LCM has been demonstrated to be highly capable when it comes to the precision and mechanical properties of the fabricated parts and has already been successfully applied to fabricate complex-shaped ceramics from alumina, yttria-stabilized zirconia, tricalcium phosphate, mullite, silicon oxycarbide and magnesia [30][31][32][33][34][35].…”

Section: Lithography-based Ceramic Manufacturing Processmentioning

confidence: 99%

Dense, Strong, and Precise Silicon Nitride-Based Ceramic Parts by Lithography-Based Ceramic Manufacturing

Altun¹,

Prochaska²,

Konegger

et al. 2020

Applied Sciences

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Due to the high level of light absorption and light scattering of dark colored powders connected with the high refractive indices of ceramic particles, the majority of ceramics studied via stereolithography (SLA) have been light in color, including ceramics such as alumina, zirconia and tricalcium phosphate. This article focuses on a lithography-based ceramic manufacturing (LCM) method for β-SiAlON ceramics that are derived from silicon nitride and have excellent material properties for high temperature applications. This study demonstrates the general feasibility of manufacturing of silicon nitride-based ceramic parts by LCM for the first time and combines the advantages of SLA, such as the achievable complexity and low surface roughness (Ra = 0.50 µm), with the typical properties of conventionally manufactured silicon nitride-based ceramics, such as high relative density (99.8%), biaxial strength (σf = 764 MPa), and hardness (HV10 = 1500).

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Section: Lithography-based Ceramic Manufacturing Processmentioning

confidence: 99%

Dense, Strong, and Precise Silicon Nitride-Based Ceramic Parts by Lithography-Based Ceramic Manufacturing

Altun¹,

Prochaska²,

Konegger

et al. 2020

Applied Sciences

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“…Numerous papers, describing experimental work with certain HTP concentrations and thruster-like catalyst beds, were published recently. Koopmans et al investigated the impact of various additively manufactured structures on catalyst bed performance [22]. The effect of injection patterns on the characteristics of a catalyst bed was presented by Kang et al [23].…”

Section: Introductionmentioning

confidence: 99%

Impact of Hydrogen Peroxide Concentration on Manganese Oxide and Platinum Catalyst Bed Performance

2023

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This study investigates the use of MnxOy/Al2O3 and Pt/Al2O3 catalysts for the decomposition of hydrogen peroxide in thrusters. It describes the purpose, procedures, performance, and conclusions coming from the test campaign of the catalyst lifetimes. In particular, eight different propellant samples with two different catalysts were tested twice (in order to exclude uncertainty). Similar operating and starting conditions were applied. All hot tests were performed in a thruster-like catalyst bed configuration with a propellant injector and outlet nozzle. Each bed was filled with the same mass of catalyst (for the same type of catalyst). The results show that platinum is a more effective catalyst than manganese oxides for the decomposition of hydrogen peroxide. The findings have important implications for the development of catalysts for “green” propellants.

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“…The reason is that most researchers have done their studies using one form of support rather than using different carriers for a desired reaction [8][9][10][11]. Perhaps, because the commercial catalyst (iridium on gamma-alumina) for hydrazine decomposition has a spherical form [12][13][14], less has been paid to various forms of catalyst support in the present papers, but in the species such as hydrogen peroxides, there are some reports about the influence of the shape of catalyst support on the decomposition rate [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Development of novel supported iridium nanocatalysts for special catalytic beds

et al. 2019

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In the present paper, an experimental study of the catalytic decomposition of hydrous hydrazine was investigated on the different structural forms of the catalyst. The synthesized iridium catalysts have been usually used directly and have not been evaluated in the laboratory reactor. This study includes the preparation of iridium-based catalysts supported on spherical (alumina), honeycomb monoliths (cordierite) and foams (alumina) for the evaluation of catalytic activity in the laboratory reactor. The characterizations of these catalysts were evaluated by the TGA, FESEM and BET analysis. The result of the catalytic characterization of monolithic support was shown a homogeneous distribution of active metal without any problem of sintering (average size 25 nm) on the support surface. While the surface of the spherical and foam supports were shown non-uniform distribution of nanoparticles on the support skeleton (average size 55 nm). The monolithic catalyst exhibits higher decomposition rate and H 2 selectivity than other supports due to uniform in shape and particle size distribution.

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Comparison of HTP catalyst performance for different internal monolith structures

Cited by 9 publications

References 5 publications

Dense, Strong, and Precise Silicon Nitride-Based Ceramic Parts by Lithography-Based Ceramic Manufacturing

Dense, Strong, and Precise Silicon Nitride-Based Ceramic Parts by Lithography-Based Ceramic Manufacturing

Impact of Hydrogen Peroxide Concentration on Manganese Oxide and Platinum Catalyst Bed Performance

Development of novel supported iridium nanocatalysts for special catalytic beds

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