Direct evidence of the role of dispersed ceria on the activation of oxygen in NaX zeolite by coupling the 17O/16O isotopic exchange and 17O solid-state NMR

被引：7

作者：

Maupin, Irene ^{[1
]}

Mijoin, Jerome ^{[1
]}

Belin, Thomas ^{[1
]}

Morais, Claudia ^{[1
]}

Montouillout, Valerie ^{[2
]}

Duprez, Daniel ^{[1
]}

Bion, Nicolas ^{[1
]}

机构：

[1] Univ Poitiers, CNRS, Inst Chim Milieux & Mat Poitiers IC2MP, UMR7285, F-86022 Poitiers, France

[2] CEMHTI CNRS, F-45071 Orleans, France

来源：

JOURNAL OF CATALYSIS | 2013年 / 300卷

关键词：

Oxygen isotopic exchange; O-17; NMR; Zeolite; Ceria; NaX; SITE EXCHANGE; ACTIVE OXYGEN; OXIDATION; O-18(2); OXIDES; ADSORPTION; CATALYSTS; MOBILITY; CEO2;

D O I：

10.1016/j.jcat.2013.01.006

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The possibility to understand the phenomena of oxygen diffusion in the solids may be decisive to explain the role of framework oxygen atoms in a catalytic mechanism or in catalyst regeneration steps. In this work, two highly efficient characterization techniques have been associated: the O-17/O-16 isotopic exchange and the O-17 high field solid-state NMR spectroscopy. This combination leads to a powerful tool to investigate the interaction between gaseous dioxygen molecule and lattice oxygen atoms. Here, it permits to demonstrate the enhancement of the participation of zeolitic oxygen atoms in the exchange with the gas phase when ceria is simply mixed with NaX. (C) 2013 Elsevier Inc. All rights reserved.

引用

页码：136 / 140

页数：5

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