Roles of Fe2+, Fe3+, and Cr3+ surface sites in the oxidation of NO on the (Fe,Cr)3O4(111) surface termination of an α-(Fe,Cr)2O3(0001) mixed oxide

被引：8

作者：

Henderson, M. A. ^{[1
]}

机构：

[1] Pacific NW Natl Lab, Fundamental & Computat Sci Directorate, Div Phys Sci, Richland, WA 99352 USA

来源：

JOURNAL OF CATALYSIS | 2014年 / 318卷

关键词：

Nitric oxide; Mixed oxide surface; Temperature-programmed desorption; Oxidation; Photocatalysis; SELECTIVE CATALYTIC-REDUCTION; LASER INDUCED DESORPTION; NITRIC-OXIDE; PHOTOCATALYTIC REDUCTION; WATER PHOTOOXIDATION; SOLID-SOLUTIONS; NITROGEN-OXIDE; ADSORPTION; CR2O3(0001); MECHANISM;

D O I：

10.1016/j.jcat.2014.07.015

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 oxidation of NO was explored on a mixed Fe + Cr oxide surface using temperature-programmed desorption (TPD). NO desorbs from (Fe,Cr)(3)O-4(111) in two main peaks at 220 and 370 K, with a third minor peak at similar to 315 K. O-2 TPD shows similar behavior. The strongly and weakly bound molecules are due to adsorption at Fe2+ and Fe3+ sites, respectively, and the minor states are assigned to Cr3+ sites. No thermal decomposition was detected for adsorbed NO, whereas similar to 10% of the adsorbed O-2 dissociated at Fe2+ sites. NO reacts with preadsorbed O-2 to produce surface nitrate, as confirmed by isotopic labeling, which decomposes in TPD at 425 K. Atomically adsorbed O does not react with NO. Fe3+ and Cr3+ sites do not appear to participate in NO oxidation. Irradiation of adsorbed NO or NO + O-2 with 460 nm light results predominantly in photodesorption, which limits the extent of possible surface photoreactions. (C) 2014 Elsevier Inc. All rights reserved.

引用

页码：53 / 60

页数：8

共 57 条

[1] Dissociative adsorption of NO on TiO2(110)-(1 x 2) surface:: Ti2O3 rows as actives sites for the adsorption [J].