The experimental apparatus consists basically of a tubular reac- tor made of 316L stainless steel tube (100 cm length, 3.82 mm inner diameter) with a capacity of approximately 11.46 mL, immersed in a thermostatic water bath at 65 ◦ C, with temperature controlled within ±0.5 ◦ C. Two independent supply lines, equipped with check valves (HIP, 14-41AF1-T), were used to feed the substrates (