Commercial H-Beta with specific Si/Al ratios of 6, 25 and 260, which were determined by inductively coupled plasma-optical emission spectroscopy (OPTIMA 8300), were written as Beta-Al, Beta-C and Beta-Si, respectively.
Pd/Beta zeolites were obtained by common impregnation method using Palladium (II) nitrate dihydrate (Sigma) as the Pd precursor. The Pd loading of all the adsorbent was 1 wt.%. The definite preparation method is as follows. First, 0.25 g Palladium (II) nitrate dihydrate was put into 600 mL deionized water and stirred for 10 min at room temperature. Second, 10.00 g of Beta was added, and the solution continued to be stirred for 2 h at room temperature. Third, the solution was transferred to a rotary evaporation flask with temperature of 80 °C for drying. The obtained sample was placed in an oven and dried for 12 h at 70 °C. Finally, the sample was calcined in a muffle furnace at 600 °C for 5 h with a heating rate of 5 °C/min. A synthetic path description diagram is shown inFigure S6 .
In order to explore the hydrothermal stability of the adsorbent, the prepared adsorbent was hydrothermally aged at 750 °C and 800 °C for 16 h in 10% H2O/air, denoted as Pd/Beta-750HTA and Pd/Beta-800HTA, respectively.
Pd/Beta zeolites were obtained by common impregnation method using Palladium (II) nitrate dihydrate (Sigma) as the Pd precursor. The Pd loading of all the adsorbent was 1 wt.%. The definite preparation method is as follows. First, 0.25 g Palladium (II) nitrate dihydrate was put into 600 mL deionized water and stirred for 10 min at room temperature. Second, 10.00 g of Beta was added, and the solution continued to be stirred for 2 h at room temperature. Third, the solution was transferred to a rotary evaporation flask with temperature of 80 °C for drying. The obtained sample was placed in an oven and dried for 12 h at 70 °C. Finally, the sample was calcined in a muffle furnace at 600 °C for 5 h with a heating rate of 5 °C/min. A synthetic path description diagram is shown in
In order to explore the hydrothermal stability of the adsorbent, the prepared adsorbent was hydrothermally aged at 750 °C and 800 °C for 16 h in 10% H2O/air, denoted as Pd/Beta-750HTA and Pd/Beta-800HTA, respectively.