Figure 6.

Evaluation of Ni/Nb₂O₅ Catalysts in the Conversion of Diphenyl Ether at 160°C

(A and B) (A) HDO extent as a function of time (note that measurement began upon the reaction mixture reaching the temperature of 160°C, ca. 15 min ramp time); (B) relationships between conversion or HDO extent or DOD and Ni loading in Ni/Nb₂O₅. Reaction conditions: diphenyl ether (13.5 mmol), n-dibutyl ether (3.64 mmol, as an internal standard for gas chromatography, GC, analysis), methylcyclohexane (70 mL, solvent), catalyst (0.500 g), H₂ pressure of 4 MPa (at room temperature), stirring rate of 400 rpm.