The total number of available Ga sites is used to adjust the conversion of ethylene. Here, a total number of 0.85×10 -4 mol of Ga sites per 1 g of catalyst is used, corresponding to a catalyst loading of 0.3%. We use this value because a Ga loading of 3 wt% was used in the experiments in the previous work, and we assume that approximately 10% of the total Ga sites are reactive.