A MEMS-Based Catalytic Microreactor for a H$_{\bf 2}$O$_{\bf 2}$ Monopropellant Micropropulsion System

Widdis, Stephen; Asante, Kofi; Hitt, Darren L.; Cross, Michael; Varhue, W. J.; McDevitt, Michael R.

doi:10.1109/tmech.2013.2249085

Cited by 25 publications

(17 citation statements)

References 9 publications

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“…Here, A 0 is the pre‐exponential or frequency factor, E a is the activation energy of the decomposition reaction, R is the universal gas constant (8.314 J (mol·K) −1 ) and T is the temperature of the system in K. A 0 indicates the total number of collisions in a reaction, which is usually temperature‐dependent and must be experimentally determined . For a catalytic decomposition reaction, other authors even stated that the value of A 0 is dependent on the surface‐to‐volume ratio of the catalyst . Finally, Zhou and Hitt analytically determined the reaction kinetics for the catalytic decomposing reaction of H 2 O 2 gas on an iron catalyst to be A 0 = 10 9 s −1 and E a = 50.2 kJ mol −1 .…”

Section: Introductionmentioning

confidence: 99%

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FEM-based modeling of a calorimetric gas sensor for hydrogen peroxide monitoring

Jildeh

Kirchner²,

Oberländer

et al. 2017

Phys. Status Solidi A

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A physically coupled finite element method (FEM) model is developed to study the response behavior of a calorimetric gas sensor. The modeled sensor serves as a monitoring device of the concentration of gaseous hydrogen peroxide (H 2 O 2 ) in a high temperature mixture stream in aseptic sterilization processes. The principle of operation of a calorimetric H 2 O 2 sensor is analyzed and the results of the numerical model have been validated by using previously published sensor experiments. The deviation in the results between the FEM model and experimental data are presented and discussed.

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Section: Introductionmentioning

confidence: 99%

“…A two‐dimensional (2D) model of a H 2 O 2 micro‐thruster assembly, where rhodium dioxide (RhO2) nano‐rods were used as a catalyst, was studied by Widdis et al . In their work, the porosity and surface effects of the catalytic surface were not considered.…”

Section: Introductionmentioning

confidence: 99%

FEM-based modeling of a calorimetric gas sensor for hydrogen peroxide monitoring

Jildeh

Kirchner²,

Oberländer

et al. 2017

Phys. Status Solidi A

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“…In this investigation, the same RuO 2 NR coating was used to enhance the reactivity of two different chemical reaction systems. In the first case, the walls of a micro-reactor were coated with a RuO 2 NR film, for the purpose of enhancing the decomposition of a high concentration (30%) H 2 O 2 monopropellant fuel for implementation in a micropropulsion system for small satellites [1] [2]. In the second reaction system, the RuO 2 NR coating was applied to the surface of a conductive electrode that was used to electrolyze an aqueous solution of H 2 SO 4 [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Wetting on the Ability of Nanomaterials to Act as Effective Catalysts

Cross¹,

Varhue²,

McDevitt³

et al. 2016

ACES

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The ability of some nanostructured materials to perform as effective heterogeneous catalysts is potentially hindered by the failure of the liquid reactant to effectively wet the solid catalyst surface. In this work, two different chemical reactions, each involving a change of phase from liquid to gas on a solid catalyst surface, are investigated. The first reaction is the catalyzed decomposition of a H 2 O 2 monopropellant within a micro-chemical reactor chamber, decorated with RuO 2 nanorods (NRs). The second reaction involves the electrolysis of dilute aqueous solutions of H 2 SO 4 performed with the cathode electrode coated with different densities and sizes of RuO 2 NRs. In the catalyzed H 2 O 2 decomposition, the reaction rate is observed to decrease with increasing catalyst surface density because of a failure of the liquid to wet on the catalyst surface. In the electrolysis experiment, however, the reaction rate increased in proportion to the surface density of RuO 2 NRs. In this case, the electrical bias applied to drive the electrolysis reaction also causes an electrostatic force of attraction between the fluid and the NR coated surface, and thus assures effective wetting.

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“…Several H 2 O 2 propulsion concepts have been under investigation by different groups, including monopropellant [3][4][5][6][7][8], bipropellant [1,[9][10][11][12][13], and hybrid systems [14,15]. The former two primarily address low-to-medium thrust ranges and are therefore mostly used for attitude control applications.…”

Section: Introductionmentioning

confidence: 99%

Impact of Catalyst Length and Preheating on Transient Catalytic H2O2 Decomposition Performance

Krejci

Schuh

Koopmans

et al. 2015

Journal of Propulsion and Power

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A MEMS-Based Catalytic Microreactor for a H$_{\bf 2}$O$_{\bf 2}$ Monopropellant Micropropulsion System

Cited by 25 publications

References 9 publications

FEM-based modeling of a calorimetric gas sensor for hydrogen peroxide monitoring

FEM-based modeling of a calorimetric gas sensor for hydrogen peroxide monitoring

Effect of Wetting on the Ability of Nanomaterials to Act as Effective Catalysts

Impact of Catalyst Length and Preheating on Transient Catalytic H2O2 Decomposition Performance

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