Concerted Bimetallic Nanocluster Synthesis and Encapsulation via Induced Zeolite Framework Demetallation for Shape and Substrate Selective Heterogeneous Catalysis. Issue 22 (2nd May 2018)

• Record Type: Journal Article
• Authors: Iida, Takayuki; Zanchet, Daniela; Ohara, Koji; Wakihara, Toru; Román‐Leshkov, Yuriy
• Is Part Of: Angewandte Chemie international edition. Volume 57:Issue 22(2018)
• Page Start: 6454
• Page End: 6458
• Publication Date: 2018-05-02
• Subjects: bimetallic -- encapsulation -- heterogeneous catalysis -- nanoclusters -- zeolites; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201800557
• Languages: English
• ISSNs: 1433-7851

Abstract

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 : Encapsulated : A new method to produce PtZn x bimetallic nanoclusters encapsulated inside MFI zeolite crystals was developed by introducing Pt 2+ cations into a zincosilicate framework by ion exchange, and subsequent controlled demetallation and reduction. The resulting zeolites catalysts featuring PtZn x nanoclusters have both shape and substrate specificity.