Performance characteristics of silver catalyst bed for hydrogen peroxide

Lee, Su-Lim; Lee, Choong-Won

doi:10.1016/j.ast.2008.02.007

Cited by 35 publications

(8 citation statements)

References 5 publications

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“…Hydrogen peroxide is a water-soluble oxidant that self-decomposes in the presence of heat or a catalyst. Various materials such as iron chloride [34], silver [35], [36], platinum [37], manganese dioxide [38] and perovskites [39] have been used as catalyst to strike or increase the speed of decomposition of hydrogen peroxide; in particular, silver is an attractive catalyst for hydrogen peroxide decomposition due to its high efficiency [40]. The catalytic decomposition of hydrogen peroxide results in the formation of a two-phase flow of oxygen (gas phase) and water (liquid phase); the reaction liberates enough heat that, under the right conditions, transforms water into steam.…”

Section: Example: Microreactor For Catalytic Decomposition Of Hydroge...mentioning

confidence: 99%

Additively Manufactured Robust Microfluidics via Silver Clay Extrusion

Segura-Cárdenas

Velásquez–García

2020

J. Microelectromech. Syst.

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We report novel, low-cost, high-temperature compatible, high-pressure compatible, and chemically resistant additively manufactured microfluidics. The devices were monolithically fabricated by extruding silver clay with a fused filament fabrication 3D printer frame fitted with a syringe extruder, followed by annealing at 885 • C in air. Analysis of the printable feedstock shows that the green material is an alloy composed of silver and copper microparticles blended with an organic binder matrix, while analysis of printed and annealed samples shows that the material is completely free of binder and compatible with at least 800 • C operation. Characterization of the thermal, electrical, and mechanical properties of printed and annealed structures yields values close to those of bulk sterling silver, except for a significantly smaller Young's modulus. Metrology of test structures evidences linearity between printed dimensions and computer-aided design values. Layers as thin as 150 µm and working, watertight closed channels as narrow as 200 µm were consistently resolved. A proof-of-concept microfluidic that catalytically decomposes hydrogen peroxide was designed, fabricated, and characterized; the experimental performance of the catalytic microreactor is in agreement with reduced-order modeling.

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Section: Example: Microreactor For Catalytic Decomposition Of Hydroge...mentioning

confidence: 99%

Additively Manufactured Robust Microfluidics via Silver Clay Extrusion

Segura-Cárdenas

Velásquez–García

2020

J. Microelectromech. Syst.

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“…Another work to be noted is by Cervone et al, [21] which tested their 5N and 25N monopropellant thrusters by using 87.5% concentration hydrogen peroxide with pure silver gauge and pallets as catalyst, coated with manganese oxide and platinum. Silver catalyst performance characteristics i.e., exhaust velocity and pressure drop; and its own reaction with hydrogen peroxide has also been studied and reported by Lee and Lee [22]. The development of the hydrogen peroxide monopropellant thruster can be observed by the work of Amri et al, [23], and Haq et al, [24] where both of them developed the 1N class thruster by using HTP and silver catalyst.…”

Section: Introductionmentioning

confidence: 99%

Porosity Effect of the Silver Catalyst in Hydrogen Peroxide Monopropellant Thruster

Shahrin

Othman

Mohd

et al. 2021

CFDL

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In monopropellant system, hydrogen peroxide is used with catalyst to create an exothermic reaction. Catalyst made of silver among the popular choice for this application. Since the catalyst used is in porous state, the effect of its porosity in the hydrogen peroxide monopropellant thruster performances is yet unknown. The porosity changes depending on factors including catalyst pact compaction pressure, bed dimension, and type of catalyst used. As researches on this topic is relatively small, the optimum porosity value is usually left out. The performance of the thruster indicated by the pressure drop across the catalyst bed. Porosity of the catalyst bed adds additional momentum sink to the momentum equation that contributes to the pressure gradient which lead to pressure loss inside thruster. The effect of porosity influences the performance and precision of the thruster. Study of the pressure drop by the catalyst bed requires a lengthy period and expensive experiments, however, numerical simulation by mean of Computational Fluid Dynamics (CFD) can be an alternative. In this paper, 90 wt% hydrogen peroxide solution with silver catalyst is studied in order to investigate the influence of porosity to the performances of the thruster, and to find the optimum porosity of the thruster. Species transport model is applied in the single-phase reaction simulation using the EDM for turbulence-chemistry interaction. Through this study, the effect of porosity towards the thruster performances represented in term of pressure drop, exit velocity, bed temperature, and thrust, and porosity of 0.4 found to be as an optimal value.

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“…For example, the active phase, an expensive metal catalyst, is deposited as a thin-layer, highly porous support to increase the specific surface area. Use of platinum [ 54 ] or manganese oxide [ 55 ] deposited over aluminum oxide, structured networks of silver [ 56 ], granules and tablets of aluminum oxide with deposited layers of platinum or manganese oxide [ 57 ], cellular and honeycomb monoliths [ 58 ] from manganese oxides dispersed on monolithic zirconia substrates have been demonstrated in various studies for efficient oxygen generation. An essential characteristic of the catalyst which allows regulation of its functional properties is porosity or, more precisely, the ratio between specific surface area and mechanical strength.…”

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confidence: 99%

Oxygen Generation Using Catalytic Nano/Micromotors

Naeem

Mujtaba

et al. 2021

Micromachines

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Gaseous oxygen plays a vital role in driving the metabolism of living organisms and has multiple agricultural, medical, and technological applications. Different methods have been discovered to produce oxygen, including plants, oxygen concentrators and catalytic reactions. However, many such approaches are relatively expensive, involve challenges, complexities in post-production processes or generate undesired reaction products. Catalytic oxygen generation using hydrogen peroxide is one of the simplest and cleanest methods to produce oxygen in the required quantities. Chemically powered micro/nanomotors, capable of self-propulsion in liquid media, offer convenient and economic platforms for on-the-fly generation of gaseous oxygen on demand. Micromotors have opened up opportunities for controlled oxygen generation and transport under complex conditions, critical medical diagnostics and therapy. Mobile oxygen micro-carriers help better understand the energy transduction efficiencies of micro/nanoscopic active matter by careful selection of catalytic materials, fuel compositions and concentrations, catalyst surface curvatures and catalytic particle size, which opens avenues for controllable oxygen release on the level of a single catalytic microreactor. This review discusses various micro/nanomotor systems capable of functioning as mobile oxygen generators while highlighting their features, efficiencies and application potentials in different fields.

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Performance characteristics of silver catalyst bed for hydrogen peroxide

Cited by 35 publications

References 5 publications

Additively Manufactured Robust Microfluidics via Silver Clay Extrusion

Additively Manufactured Robust Microfluidics via Silver Clay Extrusion

Porosity Effect of the Silver Catalyst in Hydrogen Peroxide Monopropellant Thruster

Oxygen Generation Using Catalytic Nano/Micromotors

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