Subscribe to RSS
Shape-Selective Hydrogenation of Nitroarenes by Using Zeolite-Encaged Single-Atom Rhodium Catalysts
Zeolite-Encaged Single-Atom Rhodium Catalysts: Highly-Efficient Hydrogen Generation and Shape-Selective Tandem Hydrogenation of Nitroarenes.
Angew. Chem. Int. Ed. 2019;
18 February 2020 (online)
A single-atom rhodium catalyst immobilized on silicate-1 zeolite ([email protected]), prepared as shown in equation 1, catalyzed the hydrolysis of ammonia–borane with a turnover frequency of 432 molH2 molRh –1 min–1 (eq. 2). A sequential hydrolysis of ammonia–borane and hydrogenation of nitroarenes also proceeded in the presence of [email protected] (eq. 3).
As shown in equation 3, p-substituted nitrobenzenes were reduced to the corresponding anilines with 100% conversion and >99% selectivity, whereas m-substituted nitrobenzenes were almost intact after the hydrogenation reaction. [email protected] was characterized by means of 13C MAS-NMR, TG-DTA, PXRD, ICP-AES, HAADF-STEM, HRTEM, SEM, EDS, XPS, XANES, EXAFS, and CO-DRIFTS measurements.