Concerted Bimetallic Nanocluster Synthesis and Encapsulation via Induced Zeolite Framework Demetallation for Shape and Substrate Selective Heterogeneous Catalysis

Author(s)

Iida, Takayuki ^{[1, 2]} ; Zanchet, Daniela ^{[2, 3]} ; Ohara, Koji ^[4] ; Wakihara, Toru ^[1] ; Roman-Leshkov, Yuriy ^[2]

Affiliation

^[1] Univ Tokyo, Dept Chem Syst Engn, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656 - Japan

^[2] MIT, Dept Chem Engn, 25 Ames St, Cambridge, MA 02139 - USA

^[3] Univ Estadual Campinas, Inst Chem, PO 6154, BR-13083970 Campinas, SP - Brazil

^[4] Japan Synchrotron Radiat Res Inst SPring 8, Kouto 1-1-1, Sayo, Hyogo 6795198 - Japan

• Document type: Journal article
• Source: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION; v. 57, n. 22, p. 6454-6458, MAY 28 2018.
• Web of Science Citations: 11

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 PtZnx nanoclusters encapsulated inside zeolite micropores by introducing Pt2+ 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 PtZnx 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. (AU)

• FAPESP's process: 15/23900-2 - Earth-abundant materials as next-generation catalytic platforms for the conversion of lignocellulosic biomass
• Grantee: Daniela Zanchet
• Support Opportunities: Scholarships abroad - Research