Fig. 4: Catalytic performance of Pd3ZnCx in acetylene selective hydrogenation reaction. | Nature Communications

Fig. 4: Catalytic performance of Pd3ZnCx in acetylene selective hydrogenation reaction.

From: Co-infiltration and dynamic formation of Pd3ZnCx intermetallic carbide by syngas boosting selective hydrogenation of acetylene

Fig. 4

Acetylene conversion (bar plot) and ethylene selectivity (line plot) of the Pd3ZnCx (red) and PdZn (black) catalysts in selective hydrogenation of acetylene in an excess of ethylene, with different H2/C2H2 ratio. a 2% C2H2, 2.2% H2 and 80% C2H4 in balance with He (H2/C2H2 = 1); b 2% C2H2, 8% H2 and 80% C2H4 in balance with He (H2/C2H2 = 4). Reaction conditions: space velocity = 5000 mL g−1 h−1; pressure = 0.5 MPa. c Durability test on Pd3ZnCx for 200 h at 120 °C, and STEM images after the durability test as inset. Pd loading: 0.08 wt%. Feed gas: 2% C2H2, 2.2% H2 and 80% C2H4 in balance with He. Reaction conditions: space velocity = 5000 mL g−1 h−1; pressure = 0.5 MPa. d Catalytic performance of Pd3ZnCx and other reported transition metal catalysts in literatures for the semi-hydrogenation of acetylene (Data from Table S4). e DFT calculated surface model of PdZn and Pd3ZnCx (top view). f Free energy profiles of acetylene hydrogenation on PdZn and Pd3ZnCx catalysts.

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