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Fig. 5. (a) Gibbs free energy diagram of α-type (C3H8 → 1-C3H*7 → C3H*6 → 1-C3H*5) PDH reaction on Pt(211), Pt3In(211)_Pt and Pt3In(211)_In. (b) Gibbs free energy diagram of α-type PDH reaction on Pt(111), Pt3In(111), Pt1In1(111) and PtIn2(110).