A one-dimensional multicomponent two-fluid model of a reacting packed bed including mass, momentum and energy interphase transfer

Methodology for Geometric Optimization and Sizing for Subnewton Monopropellant Catalyst Beds

“…If this were not the case then underutilization effects would imply a drop in chamber temperature at higher flow rates before the flooding limit. This generally agrees with observations from literature using models of HTP catalytic decomposition, where there is a rapid increase in the fluid temperature and fast bulk decomposition after vaporization [13,15]. It is suggested that the decomposition mechanism changes once a certain temperature is reached, and thermolytic decomposition dominates.…”

“…This suggests that the ratelimiting step is the first interaction between an H2O2 molecule and the active sites on the catalyst [24], and is therefore governed by the mass transport from the bulk fluid to the catalyst sites. (near the hydrogen peroxide boiling point) [13,24]. Although very wide, it is reasonable to assume that the reaction rates in the current work will fall within this range.…”

“…This will determine the axial location of the propellant phase-change front and therefore the flooding onset. Reaction rates can vary greatly for different HTP concentrations and catalyst active phase and microscale structure [13,24]. The mechanism of the catalysis of hydrogen peroxide by platinum is not understood with certainty, however for higher HTP concentrations the reaction order is typically 1, i.e.…”

“…Experimental work typically uses either modular thruster designs allowing for testing different configurations or a limited selection of different thruster geometries [10][11][12]. Some research has used computational chemical reaction modelling of the catalyst bed to investigate the effect of the design on the performance [13][14][15]. However, these typically rely on simplifications and have limited experimental validation.…”

Development and characterization of a catalyst for the decomposition of hydrogen peroxide

“…The most conventional catalyst for H 2 O 2 decomposition is metallic silver, which suffer from two major drawbacks, namely temperature limitations and poisoning from the stabilizers used to prevent the self-decomposition of hydrogen peroxide. Many research activities have been performed in the past few years about the catalytic decomposition of H 2 O 2 [4][5][6][7]. Precious metals as well as Mn oxides were extensively studied but no real consensus seems to emerge about the most active metal for this reaction [8][9][10].…”