Abstract
The influence of hydrogen partial pressure on hydrodenitrogenation (HDN) of nitrogen compounds, found in the coal-derived naphtha fraction, was examined using a continuous flow reactor. The HDN reaction of coal-derived naphtha was not enhanced by increasing the hydrogen partial pressure from 2.4 to 5.3 MPa. The influence of hydrogen partial pressure on HDN of pyridine, pyrrole, and aniline was also investigated. Although HDN of pyridine was not improved by increasing hydrogen partial pressure, HDN of aniline was improved. The HDN rate of pyridine was constant during the experiment, however, the HDN rate of aniline gradually decreased with increasing space time. Properties of pyrrole HDN were somewhat between those of pyridine and aniline. The difference in the HDN properties was interpreted in terms of the difference in the adsorption strengths of nitrogen compounds on the catalyst surface.
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