ReviewLecture3b_2014

Oh ch3 minor h2 o hv h ho minor o h2 o 2

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Unformatted text preview: cule NOTE: above reac7on is the only reac7on that produces ozone in the atmosphere!! Chapman Cycle: Destruc7on Step Ozone absorbs UV radia=on (240 to 320 nm range) and decomposes back to O2 and O: ⇤ O 3 + h⌫ ! O + O 2 (⌫ < 320nm) Ozone then reacts with atomic oxygen to regenerate two molecules of O2: O ⇤ + O 3 ! 2O 2 Atomic oxygen ozone Pictorial View of the Reac7on Steps in a Chapman Cycle 2O2 (from: [email protected]://didarca.dma.unifi.it) Representa7on of the Chemical Steps as a Reac7on Cycle O 3 + h⌫ ! O ⇤ + O 2 O ⇤ + O2 + M ! O3 + M 0 hv ⇤ 03 0⇤ hv 02 O ⇤ + O 3 ! 2O 2 O 2 + h ⌫ ! 2O ⇤ Kine7c Analysis Step 1: O 2 + h ⌫ ! 2O ⇤ r1 = k1 CO2 Step 2: O ⇤ + O2 + M ! O3 + M Step 3: O 3 + h⌫ ! O ⇤ + O 2 r3 = k3 CO3 Step 4: O ⇤ + O 3 ! 2O 2 r4 = k4 CO3 CO r2 = k2 CO CO2 CM Determine the rates of produc=on of the ac=ve species RO3 = k2 CO CO2 CM RO = 2k1 CO2 k3 CO3 k4 CO3 CO k2 CO CO2 CM + k3 CO3 k4 CO3 CO Kine7c Analysis 2 Apply the pseudo-...
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This document was uploaded on 03/14/2014.

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