“…When the erythritol conversion was below 80%, the selectivity to 1,2-butanediol and 1,4-butanediol was above 85% and below 15%, respectively, indicating that the DODH + HG of the primary-secondary vicinal OH groups in erythritol to form 1,2-butanediol proceeds more preferentially than that of the secondary-secondary vicinal OH groups to provide 1,4-butanediol. A similar 1,2-diol/1,4-diol ratio has been reported for ReO x /CeO 2 + Ni/CeO 2 mixture catalyst for DODH + HG and homogeneous Cp*ReO 3 catalyst for DODH . On the other hand, this 1,2-butanediol/1,4-butanediol ratio was smaller than the expected one from thermodynamics: Δ H f,liq difference is 16.1 kJ/mol, which corresponds to the equilibrium ratio of 110:1 at 413 K, with the assumption that the entropic term is negligible.…”