Today the majority(>90%)of Hydrogen production is from steam methane reforming(SMR),partial oxidation of heavier hydrocarbons,and coal gasification.Other methods of hydrogen production(biomass gasification,no CO2 emissions methane pyrolysis and alkaline electrolysis),have seen considerable growth and are now being deployed to industrial scale.Each source has its own impurities that need to be measured against International Standards such as ISO 14687-2,EN17124,ISO 21087.But these standards can often be challenging to implement in new installations.
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