Worksheetssection 5 Introduction to Hydrogen Production
Total questions: 10
Worksheet time: 5mins
Which energy input is most suitable for powering water electrolysis to produce hydrogen with minimal lifecycle emissions, as suggested by the offshore wind infrastructure shown?
Thermal energy from nuclear reactors
Electricity from coal-fired grid mix
Electricity from offshore wind turbines
Steam from natural gas reformers
In the electrolyzer diagram, which component is where oxygen gas is formed during water splitting?
Cathode surface near external circuit
Anode where oxidation occurs
Membrane center separating electrodes
Outlet pipe for hydrogen collection
According to the schematic steps, what sequence correctly describes ion and electron movement inside an electrolyzer?
Oxygen ions cross membrane; electrons in water
Hydrogen ions cross membrane; electrons in circuit
Hydrogen atoms cross membrane; electrons in solution
Electrons cross membrane; ions flow in wires
From the renewables diagram, which setup would produce green hydrogen?
Steam methane reformer without CCS
Electrolyzer powered by diesel generators
Electrolyzer powered by wind and solar
Electrolyzer powered by coal-fired grid
Which alternative power source listed can drive electrolysis while minimizing lifecycle CO2 when properly implemented?
Unabated natural gas turbines
Diesel generators on-site
Electricity grid with high fossil share
Nuclear power for water splitting
Plan a system using the diagrams: to scale green hydrogen at a forested site with a lake, which combination best balances reliability and low emissions?
Diesel backup powering electrolysis
Wind-solar with electrolyzer and buffer storage
Grid-only without renewables
Wind-solar only without storage
Which statement best describes the energetic nature of the primary SMR reaction CH4 + H2O → CO + 3H2?
It is adiabatic, avoiding external heating
It is isothermal, needing no heat transfer
It is endothermic, requiring continuous heat
It is exothermic, releasing significant heat
In the water-gas shift step, CO reacts with steam over a catalyst. What are the principal products of this reaction?
CO2 and H2 with minor heat
CO2 and CH4 with large heat
CO and H2O with major heat
CH4 and H2 with no heat
After SMR and water-gas shift, which unit operation is used to obtain high-purity hydrogen from the gas mixture?
Membrane humidification stacks
Cryogenic distillation columns
Electrolytic polishing cells
Pressure-swing adsorption beds
What combination enables production of blue hydrogen from ATR or SMR, and what is a current limitation?
Direct air capture only; limited by oxygen compressor capacity
Electrolysis with wind power; limited by electrode lifespan
ATR with excess steam; limited by methane purity regulations
CCS added to ATR or SMR; limited by technology readiness
