Sulfides
R1-S-R2 þ 2H 2 ! R1-H þ R2-H þ H 2 S
Disulfides
R1-S-S-R2 þ 3H 2 ! R1-H þ R2-H þ 2H 2 S
Fig. 4 Selected timelines for introduction of new sulfur limits for motor fuels
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P. Kokayeff et al.