Glossary
Hydrogen

Electrolysis; electrolysis

Chemical decomposition (of substances in fusion or solution) obtained by the passage of an electric current.

Synthesis gas or syngas

Gas mixture (H ₂ , CH ₄ , CO, CO ₂ , N ₂ ).

Hydrocracking (HCK)

A refining process that transforms heavy hydrocarbons into lighter, highly valuable fractions in the presence of hydrogen.

Hydrodesulfurization (HDS); hydrodesulphurization

Catalytic treatment, in the presence of hydrogen, of petroleum cuts ranging from light distillates to gas oils. Unwanted sulfur compounds are decomposed...