Question

Dissociative adsorption. (a) Oxygen adsorbs dissociately on silver; $\frac{1}{2}$O$_2$(g) + S = O(a). Derive a Langmuir-type isotherm for this reaction (an expression that gives the coverage of adsorbed atomic oxygen as a function of the pressure of oxygen gas.) (b) The coverage of oxygen atoms on a silver surface was measured at 700 K and 1.0 × 10$^{-3}$ mbar pressure O$_2$(g). To obtain the same coverage at 800 K required raising the pressure to 36 mbar. Estimate the enthalpy of adsorption of oxygen gas on silver.

          Dissociative adsorption.
(a) Oxygen adsorbs dissociately on silver; $\frac{1}{2}$O$_2$(g) + S = O(a). Derive a Langmuir-type isotherm
for this reaction (an expression that gives the coverage of adsorbed atomic oxygen as a function
of the pressure of oxygen gas.)
(b) The coverage of oxygen atoms on a silver surface was measured at 700 K and 1.0 × 10$^{-3}$ mbar
pressure O$_2$(g). To obtain the same coverage at 800 K required raising the pressure to 36 mbar.
Estimate the enthalpy of adsorption of oxygen gas on silver.

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Dissociative adsorption.
(a) Oxygen adsorbs dissociately on silver; (1)/(2)O2(g) + S = O(a). Derive a Langmuir-type isotherm
for this reaction (an expression that gives the coverage of adsorbed atomic oxygen as a function
of the pressure of oxygen gas.)
(b) The coverage of oxygen atoms on a silver surface was measured at 700 K and 1.0 × 10^-3 mbar
pressure O2(g). To obtain the same coverage at 800 K required raising the pressure to 36 mbar.
Estimate the enthalpy of adsorption of oxygen gas on silver.

Added by Nicholas W.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

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Solved by Expert Adi S

06/19/2023

Step 1

The Langmuir isotherm equation is given by: θ = (Kp) / (1 + Kp) Where: θ = coverage of adsorbed species K = equilibrium constant for adsorption p = pressure of gas For the dissociative adsorption of oxygen on silver: O2(g) + S O(a) The equilibrium constant K Show more…

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Dissociative adsorption. (a) Oxygen adsorbs dissociately on silver; O2(g) + S O(a). Derive a Langmuir-type isotherm for this reaction (an expression that gives the coverage of adsorbed atomic oxygen as a function of the pressure of oxygen gas.) (b) The coverage of oxygen atoms on a silver surface was measured at 700 K and 1.0 x 10^(-3) mbar pressure O2(g). To obtain the same coverage at 800 K required raising the pressure to 36 mbar. Estimate the enthalpy of adsorption of oxygen gas on silver.

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