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N2 emission-channel change in NO reduction over stepped Pd(211) by angle-resolved desorption

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Title: N2 emission-channel change in NO reduction over stepped Pd(211) by angle-resolved desorption
Authors: Matsushima, Tatsuo Browse this author →KAKEN DB
Kokalj, Anton Browse this author
Orita, Hideo Browse this author
Kubo, Toshitaka Browse this author
Sakurai, Masataka Browse this author
Kondo, Takahiro Browse this author →KAKEN DB
Nakamura, Junji Browse this author →KAKEN DB
Keywords: Nitrogen oxide
Nitrous oxide
Stepped surface
Issue Date: 2012
Publisher: Elsevier
Journal Title: Surface Science
Volume: 606
Issue: 13-14
Start Page: 1029
End Page: 1036
Publisher DOI: 10.1016/j.susc.2012.02.023
Abstract: A sharp change in the N2 emission channel from N2O(a) → N2(g) + O(a) to N(a) + N(a) → N2(g) has been found at around 500 K in a steady-state NO + D2 reaction over stepped Pd(211) = [(S)3(111) × (100)] by means of angle-resolved desorption. The desorbing N2 is highly collimated at around 30° off normal toward the step-down direction below about 500 K due to the intermediate N2O decomposition, whereas, above 500 K, the near normally directed desorption due to the recombination of N(a) is relatively enhanced. The N2O decomposition channel is promoted when the reaction is carried out with hydrogen (deuterium) and the channel change is accelerated by quick changes of the amounts of surface hydrogen and oxygen (or NO(a)) into the opposite directions, and enhanced nitrogen removal as ammonia on the resultant hydrogen-rich surface. In the steady-state NO + CO reaction, the N2 emission channel gradually changes above 500 K toward recombination. A model for the off-normal N2 emission is briefly described.
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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