3.4.6. BET

Specific surface area, pore volume, and pore average size were calculated by multipoint BET method. It was performed using an Accelerated Surface Area and Porosimetry System (ASAP 2020 V4.01).

## *3.5. Reaction Metrics*

The performance of the catalyst was evaluated by calculating: C2H4 conversions ( *XC*2*H*4 ), H2 yield *YH*2 , carbon yield (*YC*), and carbon growth rate (gC·gcat<sup>−</sup>1·h−1) in accordance with Algorithm 1 below:
