NO2 adsorption on BaO/Al2O3:: The nature of nitrate species

被引：118

作者：

Szanyi, J ^{[1
]}

Kwak, JH ^{[1
]}

Kim, DH ^{[1
]}

Burton, SD ^{[1
]}

Peden, CHF ^{[1
]}

机构：

[1] Pacific NW Natl Lab, Richland, WA 99352 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2005年 / 109卷 / 01期

关键词：

D O I：

10.1021/jp044993p

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：

Temperature programmed desorption, infrared spectroscopy, and N-15 solid state NMR spectroscopy were used to characterize the nature of the nitrate species formed on Al2O3 and BaO/Al2O3 NOx storage/reduction materials. Two distinctly different nitrate species were found: surface nitrates that are associated with a monolayer BaO on the alumina support, and a bulk-like nitrate that forms on this thin BaO layer. The surface nitrates desorb as NO2 at lower temperatures than do the bulk-like nitrates, which decompose as NO+O-2 at higher temperatures. The amount of NOx stored in the monolayer nitrate is proportional to the surface area of the catalyst, while that in the bulk nitrate increases with BaO coverage.

引用

页码：27 / 29

页数：3

共 10 条

[1]

Anderson J., 2000, STUD SURF SCI CATAL, V130, P1331

[2] A SOLID-STATE N-15 NMR-STUDY OF THE PHASE-TRANSITIONS IN AMMONIUM-NITRATE [J].