Parallelized catalyst preparation based on two-step wet impregnation was carried out by using a Thermoscientific REACTI-THERM III #TS-18823 heating/stirring module. In the first step, the support powder (150 mg) was impregnated with an EtOH solution of the chlorides at 50 °C for 2 hours. EtOH was removed under vacuum by centrifugal evaporation at 70 °C using a centrifugal evaporator (CVE-3100, Eyela). In the second step, the product of the first step was impregnated with an aqueous solution of the nitrates at 50 °C for 2 hours. Water was removed by the same method at 90 °C. The dried products were subjected to calcination under air at 400 °C for 3 hours in a muffle furnace to obtain multi-element catalysts.