Host-induced alteration of the neighbors of single platinum atoms enables selective and stable hydrogenation of butadiene

Abstract

Tuning the coordination neighbors of the metal center is emerging as an elegant approach to manipulating the performance of supported single-atom catalysts in heterogeneous catalysis. Herein, atomically dispersed Pt species...

Carbon nitride based materials: more than just a support for single-atom catalysis

“…The identical procedure has been reproduced many times for numerous metals since then. 3,7,21,282,284,295,296,301,314,[324][325][326][327]329,[356][357][358][359][360][361][362][363][364][365][366][367][368][369][370][371][372][373] Although the powders obtained after wet impregnation were not calcined in the work reported by Chen and co-workers, most of the later reports in the literature involve a final thermal annealing step at temperatures generally between 500 and 600 1C. Indeed, annealing temperature appears to be crucial for the transition from single-atoms to nanoparticle regimes, as higher temperatures promote atom migration.…”

Carbonaceous deposits on cobalt particles reverse the catalytic patterns in butadiene hydrogenation

“…Since H 2 splitting ability is crucial to butadiene hydrogenation, 3 the high hydrogenation activity of Co nanoparticles might be related to the superior H 2 disassociation ability than that of their single-atom analogue, as have been found in Ir and Pt systems. 31,42 Given the higher butenes selectivity of the deactivated Co@NC-1073 catalyst, an effort was made to improve both the catalyst stability and selectivity by optimizing the key reaction parameters. Prolonged evaluation of Co@NC-1073 at H 2 : BD = 50 and 303 K showed a quick deactivation of ca.…”

“…S10 †), indicative of a high activity dependence on the H 2 coverage as observed in previous studies. 29,42 An activity drop was observed at 403-423 K, which suggested the quick deactivation induced by the high temperatures. The TOS performance of Co@NC-1073 at H 2 : BD = 10 and 343-403 K is presented in Fig.…”

“…Since H 2 splitting ability is crucial to butadiene hydrogenation, 3 the high hydrogenation activity of Co nanoparticles might be related to the superior H 2 disassociation ability than that of their single-atom analogue, as have been found in Ir and Pt systems. 31,42…”

Defect-driven nanostructuring of low-nuclearity Pt-Mo ensembles for continuous gas-phase formic acid dehydrogenation

“…In our quest for high-performing metal-supported catalysts, nitrogen-doped carbon (NC) has been adopted as a platform to engineer the atomic structures of different precious metals [48][49][50][51] . The rich surface chemistry plus tunable nitrogen defective sites allows elegant tuning of the coordination environments of the single-atom metal centers via thermal-driving surface migration of the metal species, which are then captured and stabilized by the distinct cavities on the host 49 .…”