Concerted Bimetallic Nanocluster Synthesis and Encapsulation via Induced Zeolite Framework Demetallation for Shape and Substrate Selective Heterogeneous Catalysis. (2nd May 2018) - Iida, Takayuki
Abstract: Bimetallic nanoparticle encapsulation in microporous zeolite crystals is a promising route for producing catalysts with unprecedented reaction selectivities. Herein, a novel synthetic approach was developed to produce PtZn x nanoclusters encapsulated inside zeolite micropores by introducing Pt 2+ cations into a zincosilicate framework via ion exchange, and subsequent controlled demetallation and alloying with framework Zn. The resulting zeolites featured nanoclusters with sizes of approximately 1 nm, having an interatomic structure corresponding to a PtZn x alloy as confirmed by pair distribution function (PDF) analysis. These materials featured simultaneous shape and substrate specificity demonstrated by the selective production of p ‐chloroaniline from the competitive hydrogenation of p ‐chloronitrobenzene and 1, 3‐dimethyl‐5‐nitrobenzene. Abstract : Verkapselt : Eine neue Methode zur Herstellung von PtZn x ‐Nanoclustern verkapselt in MFI‐Zeolithkristallen wurde entwickelt. Pt 2+ ‐Kationen werden durch Ionenaustausch in ein Zincosilicat‐Gerüst eingeführt, gefolgt von kontrollierter Demetallierung und Reduktion. Die erhaltenen Zeolithkatalysatoren mit PtZn x ‐Nanoclustern zeigen Form‐ und Substratspezifität.