. The oxidation of carbon monoxide on a heterogeneous, platinum-containing catalyst is believed to proceed according...

  

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. The oxidation of carbon monoxide on a heterogeneous, platinum-containing catalyst is believed to proceed according to the sequence of elementary reactions CO+SCO-s O₂+2520-s O-S+CO-S->CO₂-S+S CO₂-S->CO₂+ S where S represents a surface-active site. (Rate Limiting Step) (a) Derive expressions for the fractional coverages of CO-S and O-S using the assumptions implied. (b) Plot the fractional coverages of CO-S and O-S as functions of pressures. In excel, use 10- 15 increments to span the range of each variable. Assume AGads, CO = -20 kJ mol¹, AGads,02 =-27 kJ mol¹ at 435 K. a. Case 1, Pco = 0.1 bar, Poz = 0-10 bar, b. Case 2, Pco = 0.01 - 1 bar, Po2 = 1 bar, (c) Derive a rate equation for the disappearance of CO. (d) Does the rate go through a maximum with CO and O2 concentrations? Why? . The oxidation of carbon monoxide on a heterogeneous, platinum-containing catalyst is believed to proceed according to the sequence of elementary reactions CO+SCO-s O₂+2520-s O-S+CO-S->CO₂-S+S CO₂-S->CO₂+ S where S represents a surface-active site. (Rate Limiting Step) (a) Derive expressions for the fractional coverages of CO-S and O-S using the assumptions implied. (b) Plot the fractional coverages of CO-S and O-S as functions of pressures. In excel, use 10- 15 increments to span the range of each variable. Assume AGads, CO = -20 kJ mol¹, AGads,02 =-27 kJ mol¹ at 435 K. a. Case 1, Pco = 0.1 bar, Poz = 0-10 bar, b. Case 2, Pco = 0.01 - 1 bar, Po2 = 1 bar, (c) Derive a rate equation for the disappearance of CO. (d) Does the rate go through a maximum with CO and O2 concentrations? Why?