Mechanism for NO_2 Storage in Barium Oxide Supported on Magnesium Oxide Studied by in Situ Raman Spectroscopy

Christian Hess; Jack H. Lunsford

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Mechanism for NO_2 Storage in Barium Oxide Supported on Magnesium Oxide Studied by in Situ Raman Spectroscopy

机译：原位拉曼光谱研究氧化镁负载氧化钡中NO_2的储存机理

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The mechanism for NO_2 storage in barium oxide supported on magnesium oxide (BaO/MgO) was investigated. In situ Raman spectroscopy was used to follow temporal changes in the composition of the catalyst that occurred during the reaction with NO_2. Up to catalyst temperatures of 400 ℃, the formation of an intermediate barium-nitro phase precedes the formation of nitrate ions, which upon further exposure lead to the formation of bulk nitrates. In contrast, preoxidation of the catalyst or exposure to oxygen leads to the formation of peroxides that enhance the rate for nitrate formation while the formation of nitro species is suppressed above 300 ℃. The spectroscopic results are in agreement with a reaction mechanism that has recently been proposed by Broquist et al.

机译：研究了NO_2在氧化镁负载的氧化钡（BaO / MgO）中的储存机理。使用原位拉曼光谱法追踪在与NO_2反应期间发生的催化剂组成的时间变化。在高达400℃的催化剂温度下，形成中间的钡-硝基相先于硝酸根离子的形成，硝酸根离子进一步暴露后会形成大量的硝酸盐。相反，催化剂的预氧化或暴露于氧气会导致过氧化物的形成，从而提高了硝酸盐的形成速率，而在300℃以上则抑制了硝基的形成。光谱结果与Broquist等人最近提出的反应机理一致。

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《The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical》 |2002年第25期|共3页
作者
Christian Hess; Jack H. Lunsford;
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中图分类物理化学（理论化学）、化学物理学;
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1. Mechanism for NO_2 Storage in Barium Oxide Supported on Magnesium Oxide Studied by in Situ Raman Spectroscopy [J] . Christian Hess, Jack H. Lunsford The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical . 2002,第25期

机译：原位拉曼光谱研究氧化镁负载氧化钡中NO_2的储存机理
2. A catalytic and in situ Raman spectroscopy study of the decomposition of nitrous oxide over barium oxide supported on magnesium oxide [J] . Xie Shuibo, Lunsford Jack H Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications . 1999,第1a2期

机译：氧化镁负载氧化钡上一氧化二氮分解的催化和原位拉曼光谱研究
3. Decomposition of Nitric Oxide over Barium Oxide Supported on Magnesium Oxide. 1. Catalytic Results and in Situ Raman Spectroscopic Evidence for a Barium-Nitro Intermediate [J] . Shuibo Xie, Gerhard Mestl, Michael P. Rosynek Journal of the American Chemical Society . 1997,第42期

机译：氧化镁负载的氧化钡上的一氧化氮分解。 1.钡-硝基中间体的催化结果和原位拉曼光谱证据
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Mechanism for NO_2 Storage in Barium Oxide Supported on Magnesium Oxide Studied by in Situ Raman Spectroscopy

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