What is the most common method of producing hydrogen?

What is the most common method of producing hydrogen?

• A. Steam methane reforming (SMR), which emits carbon dioxide.
• B. Electrolysis using renewable electricity with zero emissions.
• C. Thermal decomposition of water without catalysts.
• D. Biological fermentation at room temperature.

Answer: (A)

Steam methane reforming of natural gas dominates hydrogen production today because it uses mature, scalable technology and cheap, abundant feedstock, plus the existing natural gas and petrochemical infrastructure matches well with large-scale production needs. The process reforming methane with steam at high temperature over a catalyst produces hydrogen and carbon oxides, and a subsequent water-gas shift step converts CO to additional hydrogen and CO2, giving a high yield of hydrogen at relatively low cost. Because CO2 is released in this route, it isn’t zero-emission unless carbon capture and storage are used. Electrolysis driven by renewable electricity can be emission-free, but it’s currently more expensive and less common for base-load industrial hydrogen production. Thermal decomposition of water without catalysts is energetically impractical due to the enormous energy input required. Biological fermentation at room temperature isn’t a viable method for producing hydrogen at industrial scales.

Steam methane reforming of natural gas dominates hydrogen production today because it uses mature, scalable technology and cheap, abundant feedstock, plus the existing natural gas and petrochemical infrastructure matches well with large-scale production needs. The process reforming methane with steam at high temperature over a catalyst produces hydrogen and carbon oxides, and a subsequent water-gas shift step converts CO to additional hydrogen and CO2, giving a high yield of hydrogen at relatively low cost. Because CO2 is released in this route, it isn’t zero-emission unless carbon capture and storage are used.

Electrolysis driven by renewable electricity can be emission-free, but it’s currently more expensive and less common for base-load industrial hydrogen production. Thermal decomposition of water without catalysts is energetically impractical due to the enormous energy input required. Biological fermentation at room temperature isn’t a viable method for producing hydrogen at industrial scales.