under argon flow at 200 mL/min on a graphite susceptor and placed at the center of a

quartz tube positioned horizontally inside an inductive furnace. After purging the system

with argon as carrier gas for 10 minutes, radio frequency (RF) heating at 350 kHz was

applied to the graphite susceptor that contains the catalyst. The catalyst was first reduced with hydrogen (20 mL/min) at 720 oC for 30 minutes.