TY - GEN
T1 - Production of hydrogen peroxide by controlled H2/O2 reaction in a microchannel reactor
AU - Lawal, Adeniyi
AU - Dada, Emmanuel
AU - Halder, Raghunath
AU - Tadepalli, Sunitha
AU - Lee, Woo
AU - Voloshin, Yury
PY - 2005
Y1 - 2005
N2 - Hydrogen peroxide was formed in a packed-bed microreactor in a three-phase process involving the direct combination of hydrogen and oxygen over a solid catalyst with the hydrogen peroxide dissolved in a liquid solvent. Hydrogen and air were combined in all proportions including explosive regime over Pd catalyst supported on various oxides. The goal of the work presented here is to elucidate the mass-transfer mechanism by identifying the different controlling regimes of this reaction as a prelude to the determination of the intrinsic kinetics in the packed-bed microreactor. Absence of internal mass transfer limitation was confirmed by measuring the reaction rates with catalyst particles of different sizes. Two approaches were adopted for the determination of the influence of external mass transfer resistance on the kinetics of the reaction. In the first approach, the flow velocity was varied while keeping the residence time constant. The effect of velocity on reaction rates was an indication of external mass transfer limitation. The dominant controlling regime was confirmed by comparing the observed reaction rates with calculated external mass transfer rates using estimated mass transfer coefficients from the literature. In the second approach, the effect of temperature on the reaction rates over a range of temperatures (Arrhenius curve) was determined, keeping all the other processing conditions fixed. Comparison of reaction rates with different residence times but at constant flow velocity served as another confirmation of the controlling regime.
AB - Hydrogen peroxide was formed in a packed-bed microreactor in a three-phase process involving the direct combination of hydrogen and oxygen over a solid catalyst with the hydrogen peroxide dissolved in a liquid solvent. Hydrogen and air were combined in all proportions including explosive regime over Pd catalyst supported on various oxides. The goal of the work presented here is to elucidate the mass-transfer mechanism by identifying the different controlling regimes of this reaction as a prelude to the determination of the intrinsic kinetics in the packed-bed microreactor. Absence of internal mass transfer limitation was confirmed by measuring the reaction rates with catalyst particles of different sizes. Two approaches were adopted for the determination of the influence of external mass transfer resistance on the kinetics of the reaction. In the first approach, the flow velocity was varied while keeping the residence time constant. The effect of velocity on reaction rates was an indication of external mass transfer limitation. The dominant controlling regime was confirmed by comparing the observed reaction rates with calculated external mass transfer rates using estimated mass transfer coefficients from the literature. In the second approach, the effect of temperature on the reaction rates over a range of temperatures (Arrhenius curve) was determined, keeping all the other processing conditions fixed. Comparison of reaction rates with different residence times but at constant flow velocity served as another confirmation of the controlling regime.
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M3 - Conference contribution
AN - SCOPUS:22444434120
SN - 0816909849
T3 - 2005 AIChE Spring National Meeting, Conference Proceedings
SP - 63
BT - 2005 AIChE Spring National Meeting, Conference Proceedings
T2 - 2005 AIChE Spring National Meeting
Y2 - 10 April 2005 through 14 April 2005
ER -