Freezing copper as a noble metal-like catalyst for preliminary hydrogenation.

ABSTRACT: The control of product distribution in a multistep catalytic selective hydrogenation reaction is challenging. For instance, the deep hydrogenation of dimethyl oxalate (DMO) is inclined to proceed over Cu/SiO₂ catalysts because of inevitable coexistence of Cu⁺ and Cu⁰, leading to hard acquisition of the preliminary hydrogenation product, methyl glycolate (MG). Here, the oriented DMO hydrogenation into MG is achieved over the sputtering (SP) Cu/SiO₂ catalysts with a selectivity of more than 87% via freezing Cu in a zero-valence state. Our density functional theory calculation results revealed that Cu⁰ is the active site of the preliminary hydrogenation step, selectively converting DMO to MG via •H addition, while Cu⁺ is a key

SUBMITTER: Sun J 

PROVIDER: S-EPMC6303123 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature