Hydrogen Production

Question 1

What can you comment about Hydrogen Production Methods
(Holladay 2009)

Answer 1

SMR
Electrolysers
Colours of Hydrogen

Slide 2/13

Question 2

Describe Process of SMR

Answer 2

Hydro-desulphurisation. Steam Reforming Equation. Shift Equation

Slide 2/16

Question 3

Explain the Shirasaki Membrane Reactor

Answer 3

Tube. 500-800degrees

Slide 2/19

Question 4

Explain Alkaline Electrolysis (Guan 2023)

Answer 4

KOH solution
At Cathode: (always) Add electrons
Makes OH-
At Anode, Oxygen released.

Cold start…
But NOT quick start / shut down - NOT suitable with RE!

See Slides 2/31- 2/32

Question 5

Explain PEM Electrolyser

Answer 5

OER and HER equations

Slide 2/33

Question 6

Explain Solid Oxide Electrolyser
(Guan 2023)

Answer 6

Cathode equation addition of electrons:
H and O- - produced
Anode equation: Oxygen released
High temperature
Cold start is VERY slow

Slide 2/34

Question 7

Summarise Electrolysers (El-Emam, 2019)

Answer 7

SIZE: PEM: Compact. Alkaline: Large. SOE: Bulky

COST: PEM: Membrane Cost (Platinum). Alkaline, SOE: Low cost

COLD STARTUP: PEM: Fast. Alkaline, slower. SOE Slooow

EFFICIENCY: PEM 75%, Alkaline 80%, SOE 90%

Slide 2/39 in full

Question 8

Give other methods for producing hydrogen (research areas)

Answer 8

Thermal Splitting.
Light splitting.

From Slide 2/42