WorksheetsClassification Criteria and Color Overview
Total questions: 10
Worksheet time: 5mins
In the context of hydrogen production shown in the image, which factor is part of the classification criteria that separates high‑carbon and low‑carbon hydrogen?
Storage tank geometry
Pipeline coating material
Method of production used
End-use sector selection
Using the color-coded naming convention depicted, which color group is commonly associated with low-carbon hydrogen produced from water using renewable electricity?
Brown hydrogen from coal
Green hydrogen from electrolysis
Grey hydrogen from methane
Blue hydrogen with CCS
Which energy input is essential for producing green hydrogen via electrolysis?
Thermal energy from CCS units
Heat from SMR reactors
Electricity from renewable sources
Mechanical compression energy
In blue hydrogen production, what role does Carbon Capture and Storage (CCS) serve?
Supplies hydrogen feedstock
Generates electricity for ATR
Splits water into hydrogen
Captures and stores CO2
Which statement best differentiates green hydrogen from blue hydrogen in terms of source and by-products?
Green emits CO2 by design, blue emits oxygen
Green uses renewable electricity, blue reforming methane
Green requires CCS systems, blue avoids CO2 entirely
Green uses SMR, blue uses electrolysis
Which statement best describes grey hydrogen production shown in the diagram of a plant emitting CO2 clouds?
Hydrogen is captured while CO2 is stored underground with CCUS
Methane is fully combusted to generate heat and nitrogen oxides
Water is electrolyzed into hydrogen and oxygen with renewable power
Methane is split into hydrogen and CO2 using SMR or ATR
In brown (or black) hydrogen production, which process converts carbon‑rich solids into hydrogen while releasing CO2 and CO to the atmosphere?
Electrolysis of saline water for hydrogen
Biomass fermentation to produce syngas
Partial oxidation of methane in ATR units
Gasification of lignite or coal feedstocks
A refinery wants to reduce environmental damage from high‑carbon hydrogen. Which change most directly addresses the issue highlighted across both images?
Capture and prevent atmospheric release of process CO2
Blend hydrogen with natural gas in downstream pipelines
Increase reactor temperature to raise hydrogen yield
Switch from SMR to ATR while keeping current vents
Which production method corresponds to turquoise hydrogen in current experimental practice?
Electrolysis using nuclear plant electricity
Methane pyrolysis yielding solid carbon instead of CO2
Electrolysis powered exclusively by solar energy
Thermal catalytic splitting of water with nuclear heat
A facility plans to avoid CO2 by producing solid carbon. Which hydrogen category best aligns with this plan?
Pink hydrogen via nuclear-powered electrolysis
Yellow hydrogen via solar-powered electrolysis
Turquoise hydrogen via methane pyrolysis
Red hydrogen via nuclear thermal water splitting
