ReviewLecture5b_2014 [read]

With surface reaction iii species c2h4 h2 adsorpon

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Unformatted text preview: H2 + K5 CC2 H6 )2 X Note: we have used the rela;on: CX = Ctotal p K2 CH2 to relate surface coverage to surface concentra;on. Multiple-Component Adsorption with Surface Reaction (v) species C2H4, H2 adsorp;on species desorp;on (Cn Hm )ad Consider the case that : CH2 >> CC2 H4 then the following rate expression then H2 concentra;on is effec;vely constant and the rate expression can be approximated as kef f CC2 H4 p 2 K1 CC H K2 CH k3 Ctotal 2 p 2 4 r= (1 + K1 CC2 H4 + K2 CH2 + K5 CC2 H6 )2 r= (1 + K1 CC2 H4 + q p K2 CH2 + K5 CC2 H6 )2 where 2 kef f = k3 Ctotal K1 K2 CCH2 Multiple-Component Adsorption with Surface Reaction (vi) species C2H4, H2 adsorp;on species desorp;on (Cn Hm )ad If the surface sites have coverage all less than 1 then, (1 + K1 CC2 H4 Then the overall reac;on rate becomes: p + K2 CH2 + K5 CC2 H6 )2 1 r kef f CC2 H4...
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This document was uploaded on 03/14/2014.

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