Multiple steady states in an isothermal, integral reactor: The catalytic oxidation of carbon monoxide over platinum‐alumina

Abstract

Stable isothermal multiplicities were observed during carbon monoxide oxidation in an integral reactor, filled with alumina supported platinum catalysts. The multiplicities were investigated in the conversion-temperature, conversion-inlet carbon monoxide concentration and conversion-mass flow rate domains.The region of multiplicities was found to widen significantly upon catalyst aging which enhanced the pellets' diffusive resistances.Several intermediate stable steady states were found between the highest and lowest steady states, both experimentally and theoretically.All the above phenomena could be well interpreted by the interactions of the kinetics of carbon monoxide oxidation with intrapellet diffusion resistances.f Computed from the random pore model ot Wakao and Smith (Smith, 1970). and given here at I a& and 838'K. D increases with the 1.40'h power of T.

Steady-state and dynamic hysteresis effects during lean co-oxidation of CO and C3H6 over Pt/Al2O3 monolithic catalyst

“…The oxidation of CO on Pt has been studied extensively [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The rate of Pt-catalyzed CO oxidation is known to be self-inhibiting due to the high affinity of CO to Pt.…”

Effect of washcoat diffusion resistance in foam based catalytic reactors

“…It is well known that catalytic oxidation of CO exhibits hysteresis in CO conversion with respect to temperature and CO mass fraction [22]. The simulation starts at a low temperature of 300 K at which the reactor model is integrated to steady state.…”

The role of carriers in properties and performance of Pt-CuO nanocatalysts in low temperature oxidation of CO andp-xylene

“…As follows from previous investigation, the CO oxidation over the CuO/Al 2 O 3 , CuCr/Al 2 O 3 [6] and Pt/Al 2 O 3 [11] catalysts at low temperature was inhibited by steam. This may be due to the hydrophilic property of alumina.…”