With the assumption that the adsorption follows the Langmuir isotherm, the order of the H I decomposition reaction on each of the two metal surfaces has to be predicted. Concept Introduction: Adsorption: A molecule (adsorbate) that forms a bond to the surface (adsorbent). Associative Adsorption: A gas molecule adsorbs without fragmentation. Dissociative Adsorption: A gas molecule adsorbs and fragmentation occurs. Langmuir adsorption: The isotherm is based on the characteristic assumptions that only monomolecular adsorption takes place, adsorption is localized and the heat of adsorption is independent. Langmuir equation: p / V = p / V m + a V m Langmuir rate equation, R a d α P A ( 1 − θ ) = K a d P A ( 1 − θ ) Where, R a d = R a t e o f a d s o r p t i o n P A = Pr e s s u r e o f t h e g a s θ = f r a c t i o n o f s u r f a c e s i t e covered k a d = r a t e constant for adsorption ( 1 − θ ) = S u r f a c e s i t e r e m a i n v a c a n t f o r a d s o r p t i o n k d e = R a t e constant for desorption

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Chapter 6, Problem 6.29P

Interpretation Introduction

Interpretation:

With the assumption that the adsorption follows the Langmuir isotherm, the order of the HI decomposition reaction on each of the two metal surfaces has to be predicted.

Concept Introduction:

Adsorption: A molecule (adsorbate) that forms a bond to the surface (adsorbent).

Associative Adsorption: A gas molecule adsorbs without fragmentation.

Dissociative Adsorption: A gas molecule adsorbs and fragmentation occurs.

Langmuir adsorption: The isotherm is based on the characteristic assumptions that only monomolecular adsorption takes place, adsorption is localized and the heat of adsorption is independent.

Langmuir equation: p/V= p/Vm+ aVm

Langmuir rate equation,

Rad α PA(1−θ) = Kad PA(1−θ)

Where,

Rad= Rate of adsorptionPA = Pressure of the gasθ = fraction of surface site coveredkad= rate constant for adsorption(1−θ)=Surface site remain vacant for adsorptionkde= Rate constant for desorption

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