A fundamental understanding on the dynamically structural evolution of catalysts induced by reactant gases under working conditions is challenging but pivotal in catalyst design. Herein, in combination with state-of-the-art mass spectrometry for cluster reactions, cryogenic photoelectron imaging spectroscopy, and quantum-chemical calculations, we identified that NO adsorption on rhodium-cerium bimetallic oxide cluster RhCeO 2À can create a Ce 3 + ion in product RhCeO 2 NO À that serves as the starting point to trigger the catalysis of NO reduction by CO. Theoretical calculations substantiated that the reduction of another two NO molecules into N 2 O takes place exclusively on the Ce 3 + ion while Rh behaves like a promoter to buffer electrons and cooperates with Ce 3 + to drive NO reduction. Our finding demonstrates the importance of NO in regulating the catalytic behavior of Rh under reaction conditions and provides much-needed insights into the essence of NO reduction over Rh/CeO 2 , one of the most efficient components in three-way catalysts for NO x removal.
A RhTaC2− cluster can reduce four CO2 molecules consecutively. The pivotal roles of Rh–Ta synergy and the C2 ligand in driving CO2 reduction were rationalized. A fundamental strategy to alleviate carbon deposition in the CO2 atmosphere was provided.
A facile approach has been developed to fabricate well defined organic–inorganic hybrid beads from widely available bamboo pulp and sepiolite, in expectation of an alternative green adsorbent for the removal of organic dyes.
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