1. U.S. Environmental Protection Agency, Press Release, May 1, 1999.
2. U.S. Environmental Protection Agency, Press Release, December 21, 2000.
3. Hydrodesulfurization of hindered dibenzothiophenes: an overview
4. Obtained by applying a simple reactor volume model, V=FA0∫dX−rA, and using the fact that substituted dibenzothiophenes are 5–10 times less reactive than simple dibenzothiophenes.
5. Catalyst and process technologies for ultra low sulfur diesel