Hosten and Froment (Ghent) studied the isomerization of n-pentane to i-pentane in the presence of hydrogen...

 

Transcribed Image Text:

Hosten and Froment (Ghent) studied the isomerization of n-pentane to i-pentane in the presence of hydrogen over a bifunctional Pt-Al,O, catalyst. Globally, first a dehydrogenation takes place over the metallic function, followed by an isomer- ization over the acidic alumina sites, and finally a hydrogenation of the i-pentene takes place over Pt. The reaction sequences can be given as Dehydrogenation 1 A +* + A* 2 A* + * + M* + H,* 3 H,* + H, + 4 M* ++ M+* Isomerization 1 M+# + M# 18 5 Chemical Kinetics of Catalyzed Reactions 2 M# 3 N# N# + N+# Hydrogenation 1 N+* + N* 2 H, +* + H,* 3 N* + H,* + B* +* 4 B + B+* a) Derive a rate expression for this reaction where step 6 is rate determining. All other steps can be considered in quasi-equilibrium, and the quasi-steady-state approximation is valid. b) The overall reaction rate is found to be independent of the total pressure. Is that in agreement with your result? Hosten and Froment (Ghent) studied the isomerization of n-pentane to i-pentane in the presence of hydrogen over a bifunctional Pt-Al,O, catalyst. Globally, first a dehydrogenation takes place over the metallic function, followed by an isomer- ization over the acidic alumina sites, and finally a hydrogenation of the i-pentene takes place over Pt. The reaction sequences can be given as Dehydrogenation 1 A +* + A* 2 A* + * + M* + H,* 3 H,* + H, + 4 M* ++ M+* Isomerization 1 M+# + M# 18 5 Chemical Kinetics of Catalyzed Reactions 2 M# 3 N# N# + N+# Hydrogenation 1 N+* + N* 2 H, +* + H,* 3 N* + H,* + B* +* 4 B + B+* a) Derive a rate expression for this reaction where step 6 is rate determining. All other steps can be considered in quasi-equilibrium, and the quasi-steady-state approximation is valid. b) The overall reaction rate is found to be independent of the total pressure. Is that in agreement with your result?

Answer rating: 100% (QA)

Cuast ore not in and vemainy increase En Yade q a Ch... View the full answer