*2.1. Catalyst Preparation*

In this research, the performance of industrial Pd-Ag supported α-Al2O<sup>3</sup> catalyst is investigated in a lab-scale reactor. The catalyst OleMax® 201 manufactured by SÜD-CHEMIE (Germany, Munich) is supplied from Jam Petrochemical Complex in Iran. It is a high performance, stable, and flexible catalyst to maximize olefins production through acetylene hydrogenation. Table 1 shows the specification of fresh catalyst.


**Table 1.** The specification of fresh catalyst.

The industrial catalyst is prepared by impregnation method and Pd and Ag are dispersed on the catalyst separately. Before tests, the catalyst is activated by removing water from the pores and subsequent reduction of palladium oxide on the support to palladium black. The removal of water is carried out by purging nitrogen through the reactor at 150 ◦C for 2 h. The reduction is conducted by hydrogen-diluted stream at 150 ◦C. After reduction, the catalyst is cooled to ambient temperature by the nitrogen purging.
