... Volume: Page ... 1,4-Dioxane (AR), o-xylene (AR), p-xylene (AR), toluene (AR), triethylamine (AR), n-butylamine (AR), and diethylamine (AR) were obtained from Tianjin ... C for 4 h, and then reduced at 300 °C in a hydrogen stream at a flow rate of 10 mL/min (1 MPa ...