Which of the following method is for large central H2 production?*5 pointsElectrolysisNatural gas reformingSolar thermochemical hydrogenLiquid hydrogen

To determine the method for large central hydrogen (H2) production among the options provided, let's analyze each option briefly:

1. Electrolysis: This method uses electricity to split water into hydrogen and oxygen. While it can produce hydrogen efficiently, large-scale electrolysis is generally less common due to the high cost of the electricity required.

2. Natural gas reforming: This is the most widely used method for large-scale hydrogen production. It involves reacting methane (from natural gas) with steam to produce hydrogen and carbon dioxide. This method is cost-effective and can produce large quantities of hydrogen.

3. Solar thermochemical hydrogen: This is an innovative method that uses solar energy to drive chemical reactions to produce hydrogen. Although promising and sustainable, it is still in the experimental stages and not yet widely deployed on a large scale.

4. Liquid hydrogen: This refers to hydrogen that is stored in liquid form, typically produced by liquefying hydrogen gas. This option does not refer to a production method but instead to a storage form of hydrogen.

Based on this analysis, natural gas reforming is the most established and widely used method for large central H2 production.

Final Answer

Natural gas reforming is the method for large central H2 production.