Chap10Lecture1N - Chap.10Lecture1Definitions...

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Chap. 10  Lecture  1   Definitions Catalyst : A substance that affects  a reaction, but emerges from the  process  unaffected A catalyst changes the  reaction rate by promoting a  different  molecular  path. Catalysis is Study and Use of Catalytic Processes
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Definition contd Catalyst changes the  rate   not    equilibrium ! H 2 O H 2  + 0.5 O 2 Gas Slow Catalyst Fast E Gas Catalyst H 2 , O 2 H 2 O E n e r g y Reaction coordinate
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Homogeneous catalysis Catalyst is in  solution  with at least one of the reactants Oxo process to produce isobutylaldehyde CH 3 -CH=CH 2 + CO +  H 2 Co complex solution CH 3 - CH CHO CH 3 CH 3 -CH 2 -CH 2 -CHO Propylene
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Heterogeneous catalytic process More than one phase. Usually catalyst is solid. crude oil cyclohexane Distillate Dehydrogenate Platinum on  alumina cat. Benzene Pt Al 2 O 3 xH 2 O + 3 H 2
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Catalyst properties Catalytic reactions occur at  fluid – solid  interface Large area: silica-alumina cracking catalyst: 300 m 2 /g         pore radius:  4 nm Porous  catalyst Raney nickel: Hydrogenation of animal 
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Chap10Lecture1N - Chap.10Lecture1Definitions...

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