Catalytic Addiction/ Reduction

Question 1

(R)?
(C)?

Pdt?

Answer 1

(R): H2 gas

(C):

• Ni(s), heat
• Pt(s), rtp

-double bond breaks, H added to where the bond is broken

Question 2

What kind of catalysis?

Why?

Answer 2

Heterogeneous catalysis

-reactants and catalyst are in diff phases

Question 3

What are the three phases of catalytic addiction?

Answer 3

1. Adsorption of reactants
2. Chemical reaction
3. Desorption of pdts

Question 4

What is adsorption of reactants?

Answer 4

-Hydrogen and alkene get adsorbed onto catalyst surface
-> weakening of H-H bond& pi bond of C=C
=> increases surface concentration of reactants

Question 5

What is chemical reaction?

Answer 5

• H atoms interact with electron density in alkene double bond and bonds with carbon atom
• occurs with lower activation energy as the bonds within reactants molecules are weakened by adsorption effects

Question 6

What is desorption of pdts?

Answer 6

-produced alkene desorbs from catalyst surface