Hydrogen plays an important
role in pyridine HDN in SCW, but only a modestly superstoichiometric
H2/pyridine ratio (6.5:1) is required for essentially complete
nitrogen removal from pyridine. Performing the HDN reaction at
400 ◦C, 1.0 h, 0.025 g/cm3 water density, 5.5 MPa H2 and 100% catalyst
loading led to complete conversion of pyridine to hydrocarbon
products. Thus, this work shows that nitrogen in pyridine can be
effectively removed in SCW in the presence of a Pt/-Al2O3 catalyst
and high-pressure H2.