Reduction of nitric oxide with carbon monoxide on the Al-Mo(110) surface alloy
Reduction of nitric oxide with carbon monoxide on the Al-Mo(110) surface alloy
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DOI：
10.1016/j.ssc.2016.02.010
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发表时间：
2016-05-01
影响因子：
2.1
通讯作者：
Magkoev, T. T.
中科院分区：
文献类型：
--
作者：
Grigorkina, G. S.;Tvauri, I. V.;Magkoev, T. T.
用俄歇电子能谱、反射吸收红外光谱、程序升温脱附光谱、低能电子衍射和功函数法研究了一氧化碳(CO)和一氧化氮(NO)在Al-Mo(110)表面合金上的共吸附和反应。在室温下保温的Mo(110)上沉积铝膜，在800K下进行热处理，获得了Al-Mo(110)表面合金。在退火时，Al渗入表面，最有可能形成化合物Al2Mo的化学计量比六方表面单层。与裸Mo(110)和Al(111)膜的完全解离吸附不同，200K时，NO和CO以分子形式吸附在该合金表面。CO在NO预包覆的Al-Mo(110)衬底上的吸附极大地影响了NO分子的状态，很可能将它们置换到更高配位的位置，同时它们向表面倾斜。加热到大约室温(320K)会导致一氧化碳还原一氧化氮，产生二氧化碳，并使底物氮化。这一行为可能与表面重构提供了额外的Al/Mo界面反应位置以及合金化后d带的变化有关。(C)2016爱思唯尔有限公司。保留所有权利。
Coadsorption and reaction of carbon monoxide (CO) and nitric oxide (NO) on Al-Mo(110) surface alloy have been studied by means of Auger electron, reflection-absorption infrared and temperature programmed desorption spectroscopies (AES, RAIRS, TPD), low energy electron diffraction (LEED) and work function measurements. The Al-Mo(110) surface alloy was obtained by thermal annealing at 800 K of aluminum film deposited on Mo(110) held at room temperature. Upon annealing Al penetrates the surface, most likely forming stoichiometric hexagonal surface monolayer of the compound Al2Mo. The NO and CO adsorb molecularly on this alloy surface at 200 K, unlike totally dissociative adsorption on bare Mo(110) and Al(111) film. Adsorption of CO on NO precovered Al-Mo(110) substrate dramatically affects the state of NO molecules, most probably displacing them to higher-coordinated sites with their simultaneous tilting to the surface plane. Heating to about room temperature (320 K) causes reduction of nitric oxide with carbon monoxide, yielding CO2, and substrate nitridation. This behavior can be associated with the surface reconstruction providing additional Al/Mo interface reaction sites and change of the d-band upon alloying. (C) 2016 Elsevier Ltd. All rights reserved.