Katalyzované reakce

Katalyzované reakce

Katalyzovan reakce Kinetika katalyzovanch reakc, vliv vnitn difuze na selektivitu Heterogenn katalza B A L adsorpce KA c AL rovn c A rovn cL rovn c r k A c AcL AL KA C A C L L chemick reakce na povrchu K

cCL rovn c AL rovn cB rovn c r k c AL cB CL K Chemick reaktory Katalyzovan reakce, Vliv vnitn difuze L desorpce KC cCL rovn cC rovn cL rovn c r kC CL cC cL KC Chemisorpce Reakce ltky s aktivnm mstem na povrchu katalyztoru Adsorpn izoterma Zvislost rovnovnho mnostv adsorbovan ltky na sloen smsi Langmuirova izoterma adsorpce v jedin vrstv stupe pokryt povrchu katalyztoru

K Ac A aktivn msta s adsorbovanou ltkou 1 K Ac A vechna aktivn msta Chemick reaktory Katalyzovan reakce, Vliv vnitn difuze P. 1 Stupe pokryt povrchu Zakreslete zvislost stupn pokryt povrchu na koncentraci pro: KA = 1 KA = 10 K=1 K = 10 K = 100 0.9 0.8 stupen pokryti povrchu, bezroz. KA = 100 1 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0

Chemick reaktory Katalyzovan reakce, Vliv vnitn difuze 0 1 2 3 4 5 c, mol.l 6 7 8 9 10 Rychlostn rovnice katalytick reakce Langmuir-Hinshelwood pedpoklad rychlost urujcho kroku jeden krok relativn pomal kinetika ostatn kroky relativn rychl v rovnovze Rychlost urujc krok jednoduch heterogenn katalyzovan reakce adsorpce

povrchov reakce desorpce Chemick reaktory Katalyzovan reakce, Vliv vnitn difuze Odvozen LH rychlostn rovnice r.u.k. = reakce rychl kroky KA KC c AL rovn c A rovn cL rovn cCL rovn cC rovn cL rovn cLcelk cL c AL cBL bilance aktivnch center cLcelk cL K Ac AcL K B cB cL cLcelk cL 1 K Ac A K B cB cLcelk cL 1 K AcA K BcB c AL K Ac AcLcelk 1 K AcA K BcB cCL K C cC cLcelk

1 K AcA K BcB pomal krok c r k c AL cB CL K K Ac A K Ac A 1 r kcLcelk cB 1 K Ac A K BcB K 1 K Ac A K B cB k Chemick reaktory Katalyzovan reakce, Vliv vnitn difuze Vliv vnitn difuze na selektivitu Profil koncentrace vchoz ltky v zrnu katalyztoru Nezvisl reakce mal rozdl v difuzivitch jednotlivch ltek vnitn difuze ovlivuje vce rychlej reakci = kompenzan vliv pomal reakce roste rychlost reakce

Bon reakce ni koncentrace v zrnu katalyztoru preferuje reakci nisho du Nsledn reakce rychl reakce Chemick reaktory Katalyzovan reakce, Vliv vnitn difuze ni koncentrace vchoz ltky vy koncentrace meziproduktu zhoren selektivity na meziprodukt P. 2 Kinetika katalyzovan reakce A r B Zakreslete profily relativn rychlosti v zvislosti na konverzi pro rzn hodnoty KA a KB r k K Ac A 1 K Ac A K BcB Zakreslete zvislosti koncentrac na ase k = 1 s-1 dc A K Ac A k dt

1 K Ac A K BcB dcB K Ac A k dt 1 K Ac A K BcB Chemick reaktory Katalyzovan reakce, Vliv vnitn difuze een p. 2 1 KA KA KA KA 0.9 0.8 = = = = 1, KB = 1 10, KB = 1 10, KB = 0 1000, KB = 0 0.7 r, mol/m3 0.6 0.5 0.4

0.3 0.2 0.1 0 0 0.1 0.2 0.3 0.4 0.5 0.6 x, bezroz. Chemick reaktory Katalyzovan reakce, Vliv vnitn difuze 0.7 0.8 0.9 1

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