PdAg Nanoparticles within Core-Shell Structured Zeolitic Imidazolate Framework as a Dual Catalyst for Formic Acid-based Hydrogen Storage/Production.

ABSTRACT: Formic acid (FA; HCOOH) is one of the most promising candidates for the storage of hydrogen (H₂). Herein, we report a H₂ storage/production system based on the hydrogenation of CO₂ and dehydrogenation of FA, using a nanostructured heterogeneous catalyst. Pd₁Ag₂ nanoparticles with an average size of 2.8?nm were encapsulated within a zeolitic imidazolate framework (ZIF-8) having a core-shell structure (ZIF-8@Pd₁Ag₂@ZIF-8). This composite displayed high activity and stability during both the hydrogenation of CO₂ to produce FA and the dehydrogenation of FA into H₂ and CO₂. This improved performance is attributed to the use of ultrafine Pd₁Ag₂ nanoparticles as well as the spatial regulation of the nanoparticles within the reaction field. This study suggests a new strategy for controlling the spatial distribution of metal nanoparticles within MOFs so as to fine-tune the catalytic activity and selectivity of ZIF-8@metal nanoparticles@ZIF-8 catalysts.

SUBMITTER: Wen M 

PROVIDER: S-EPMC6821696 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature