Effect of catalyst on rate
Provides alternate reaction rate
With lower Ea
More molecules able to react
Rate increased
Effect of catalyst on the equilibrium yield
Forwards & backwards rates change by same amount
Concentration of reaction & products unchanged
Heterogenous catalyst
Catalyst in different state than reactants
Which catalyst has an active sight
What is an active sight
Heterogeneous
Place where reactants absorbed/ attached/bond to surface of catalyst
Reactions occurs
How does reaction on active site happen
Bonds in reactants weaken
Reaction takes place
How does desorption happen on active site
Products desorb
Released from active site
How to make heterogeneous catalyst more efficient
Increase SA - larger SA better efficiency
Spread catalyst on inert medium - increase surface to mass ratio
Could use powder catalyst or honeycomb surface area
Heterogenous reactions examples
Catalytic converter
Haber process
Contact process
Catalytic converter / cracking
Zeolite catalyst
C14H30 —> C8H18 + C2H12
Haber process
Iron catalyst
N2 (g) + 3H2(g) —><— 2NH3(g)
Contact process
V2O5 catalyst
Practice equations
Define auto catalyst
Product acts as a catalyst
Homogenous catalyst
Catalyst in same phase as reactants
Practice equations
Why is homogenous reaction slow at first or when it’s uncatalysed
Ions have same charge and repel
Higher Ea
Importance of variable oxidation states in catalysis
Which catalyst doesn’t last forever
Heterogenous
How to catalyst get poisoned
Active site gets blocked
What’s the better catalyst
Trans metals in middle of d block
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Atomic Structure38
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Transition metals29
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Catalysis18
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Energetics18
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Bonding Shapes13
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Group II10
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RP12
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Types Of Bonding12
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Forces9
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Halogenoalkanes7
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Group 78
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Kinetics18
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Electropholic Addition3
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Addition Of Alkenes9
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Elimination and Nucleophilic Substitution3
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Alkanes13
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General2
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Alcohols29
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Polymers6
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Acids & Bases4
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Electrode Potentials3
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Carboxylic Acids1
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Aromatic1
