Cu-modified cryptomelane oxide as active catalyst for CO oxidation reactions

被引：100

作者：

Hernandez, Willinton Y. ^{[1
,2
]}

Centeno, Miguel A. ^{[1
,2
]}

Ivanova, Svetlana ^{[1
,2
]}

Eloy, Pierre ^{[3
]}

Gaigneaux, Eric M. ^{[3
]}

Odriozola, Jose A. ^{[1
,2
]}

机构：

[1] Univ Seville, CSIC, Dept Quim Inorgan, Seville 41092, Spain

[2] Univ Seville, CSIC, Inst Ciencia Mat Sevilla, Ctr Mixto, Seville 41092, Spain

[3] Catholic Univ Louvain, Inst Condensed Matter & Nanosci, Div Mol Solids & React, B-1348 Louvain, Belgium

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2012年 / 123卷

关键词：

CO oxidation; Manganese oxides; Octahedral molecular sieve (OMS); Cu-modified cryptomelane; TEMPERATURE-PROGRAMMED REDUCTION; MANGANESE-DIOXIDE NANOMATERIALS; OCTAHEDRAL MOLECULAR-SIEVES; PREFERENTIAL OXIDATION; CARBON-MONOXIDE; LATTICE OXYGEN; SELECTIVE OXIDATION; IRON-OXIDE; DECOMPOSITION; MECHANISM;

D O I：

10.1016/j.apcatb.2012.04.024

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：

Manganese oxide octahedral molecular sieves (cryptomelane structure) were synthesized by a solvent-free method and tested in the total oxidation of CO (TOX), and preferential oxidation of CO in presence of hydrogen (PROX). The influence of Cu in the cryptomelane structure was evaluated by several characterization techniques such as: X-ray fluorescence (XRF), thermogravimetric analysis (TGA), hydrogen temperature programmed reduction (TPR-H-2) and X-ray photoelectron spectroscopy (XPS). The Cu-modified manganese oxide material (OMS-Cu) showed very high catalytic activity for CO oxidation in comparison to the bare manganese oxide octahedral molecular sieve (OMS). The improved catalytic activity observed in OMS-Cu catalyst was associated to a high lattice oxygen mobility and availability due to the formation of Cu-Mn-O bridges. In addition, under PROX reaction conditions the catalytic activity considerably decreases in the presence of 10% (v/v) CO2 in the feed while the same amount of water provokes an improvement in the CO conversion and O-2 selectivity. (c) 2012 Elsevier B.V. All rights reserved.

引用

页码：27 / 35

页数：9

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