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Surface-nitrogen removal in NO and N2O reduction on Pd(1 1 0): Angular distribution studies of desorbing products

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Title: Surface-nitrogen removal in NO and N2O reduction on Pd(1 1 0): Angular distribution studies of desorbing products
Authors: Ma, Yunsheng Browse this author
Matsushima, Tatsuo2 Browse this author →KAKEN DB
Authors(alt): 松島, 龍夫2
Keywords: Nitrogen oxide
Nitrous oxide
Single crystal surfaces
Issue Date: 15-Feb-2006
Publisher: Elsevier
Journal Title: Catalysis Today
Volume: 111
Issue: 3-4
Start Page: 302
End Page: 310
Publisher DOI: 10.1016/j.cattod.2005.10.041
Abstract: This paper is a report of angle-resolved product desorption measurements in the course of catalyzed NO and N2O reduction on Pd(1 1 0). Surface-nitrogen removal processes show different angular distributions, i.e. normally directed N2 desorption takes place in process (i) 2N(a) → N2(g). Highly inclined N2 desorption towards the [0 0 1] direction is induced in process (ii) N2O(a) → N2(g) + O(a). N2O or NH3 desorption follows the cosine distribution characterizing the desorption after the thermalization in process (iii) N2O(a) → N2O(g) or (iv) N(a) + 3H(a) → NH3(a) → NH3(g). Thus, a combination of the angular and velocity distributions provides the analysis of most of surface-nitrogen removal processes in the course of catalyzed NO reduction. At temperatures below 600 K, processes (ii) and (iii) dominate and process (iv) is enhanced at H2 pressures higher than NO. Process (i) contributes significantly above 600 K. Only three processes except for NH3 formation are operative when CO is used. Only process (ii) was observed in a steady-state N2O + CO (or H2) reaction.
Type: article (author version)
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 松島 龍夫

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