Influence of hydrogen partial pressure on hydrodenitrogenation of pyridine, aniline and quinoline

Influence of hydrogen partial pressure on hydrodenitrogenation (HDN) of pyr idine, aniline and quinoline was examined over Ni-Mo-P/alumina catalyst. Py ridine, aniline and quinoline are representative nitrogen compounds found i n coal-derived Liquids. HDN of aniline was more enhanced by increasing hydr ogen partial pressure than HDN of pyridine. The greater the adsorption stre ngth of nitrogen compounds onto catalyst surface, the lesser is the effect of partial pressure of hydrogen. When the hydrogen partial pressure increas ed, quinoline HDN improved further with hydrogen sulfide than without hydro gen sulfide. The differences in the influence of hydrogen partial pressure on the quinoline HDN reactions were also interpreted in terms of the differ ences in the adsorption strengths of nitrogen compounds produced in HDN rea ctions onto catalysts. (C) 1999 Elsevier Science B.V. All rights reserved.