“…Effective removal of sulfur and nitrogen is achieved by employing hydrodesulfurization (9,19,20,33,38,42,50,71,100,118,120,122,129,136,144,160,177,181,251,255, 269) and hydrodenitrogenation (6,49,95,128,132,206,207,215), respectively. However, beneficial uses of these impurities have also been reported (30,44,62,291,332).…”