Spectroscopic study of NO adsorption on magnesium oxide, nickel oxide and their solid solutions

Platero, E. Escalona; Spoto, G.; Zecchina, Adriano

doi:10.1039/f19858101283

Cited by 42 publications

(83 citation statements)

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“…Similar structures have been proposed for the isoelectronic NO 2 À groups upon adsorption of NO on MgO. 1,11,19,20 We acknowledge that this attribution is only tentative. At this state of the discussion the following question can be raised: is O 3 only interacting with cationic sites or is it also acting as probe of the low coordinated O 2À sites present on corners and edges (like CO, NO and CO 2 )?…”

Section: Resultssupporting

confidence: 73%

IR spectra of ozone adsorbed on MgO

Berlier

Yamamoto

Spoto

et al. 2002

Phys. Chem. Chem. Phys.

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Section: Resultssupporting

confidence: 73%

IR spectra of ozone adsorbed on MgO

Berlier

Yamamoto

Spoto

et al. 2002

Phys. Chem. Chem. Phys.

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“…505 The formation of N 2 O 2 2À species has been reported for NO adsorbed at 77 K on MgO and MgO-NiO (5%) solid solution activated under vacuo at high temperature. 535,536 On the basis of the above mentioned results and of the comparison with analogous results obtained by using CO as probe, we think that this assignment must be revised and that the bands assigned to N 2 O 2 2À can be assigned with more confidence to N 2 O 3 2À species formed following the scheme:…”

Section: The Interaction Of No With Adsorbed Oxygen On Fe-zsm-5: Form...mentioning

confidence: 83%

Probing the surfaces of heterogeneous catalysts by in situ IR spectroscopy

et al. 2010

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This critical review describes the reactivity of heterogeneous catalysts from the point of view of four simple, but essential for Chemistry, molecules (namely dihydrogen, carbon monoxide, nitrogen monoxide and ethylene) that are considered as probes or as reactants in combination with "in situ" controlled temperature and pressure Infrared spectroscopy. The fundamental properties of H(2), CO, NO and C(2)H(4) are shortly described in order to justify their different behaviour in respect of isolated sites in different environments, extended surfaces, clusters, crystalline or amorphous materials. The description is given by considering some "key studies" and trying to evidence similarities and differences among surfaces and probes (572 references).

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“…A third reaction channel which does not involve transport of holes and/or F centers and of which the effectiveness decreases with increasing O 2 exposure time is therefore needed. Such a reaction channel has been proposed by Platero et al 30 and Cerruti et al 31 for MgO surfaces, based on infrared spectroscopy studies:…”

Section: Discussionmentioning

confidence: 95%

“…by Platero et al 30 and Cerruti et al, 31 is based on the same type of intermediate, N 2 O 2 n-. However, the probability of its formation in the absence of excess electrons is expected to be much lower.…”

Section: Discussionmentioning

confidence: 98%

Effects of O₂ on the Reduction of NO over Prereduced CaO Surfaces: A Mechanistic Understanding

Acke

Panas

1999

J. Phys. Chem. B

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The effect of O 2 on the reduction of NO over prereduced CaO surfaces is investigated. The experimental results suggest the existence of at least three different reaction channels, of which two are related to the high-temperature reduction of the CaO surfaces and involve the use of extra electrons in breaking the NO bond. The third reaction channel does not employ extra electrons for bond breaking, but the activity is affected by the amount of adsorbed surface oxygens. The difference between the former two reaction channels is found in the temperature needed for an observable activity. The reaction channel which is already active at low temperatures is described by a model based on F-centers, whereas the one which needs elevated temperatures involves a hole transport through the bulk. The activation energy for this transport is determined experimentally using a temperature-programmed reaction technique as well as theoretically by means of ab initio quantum chemistry calculations. Room-temperature exposure to O 2 is suggested to result in a poisoning of the F-centers, but has only a minor effect on the reaction channel proposed for high temperatures. Effects on the reduction of NO of time as well as temperature for the O 2 exposure step are also investigated and found to be consistent with an understanding based on the coexistence of different reaction channels.

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Spectroscopic study of NO adsorption on magnesium oxide, nickel oxide and their solid solutions

Cited by 42 publications

References 0 publications

IR spectra of ozone adsorbed on MgO

IR spectra of ozone adsorbed on MgO

Probing the surfaces of heterogeneous catalysts by in situ IR spectroscopy

Effects of O₂ on the Reduction of NO over Prereduced CaO Surfaces: A Mechanistic Understanding

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Spectroscopic study of NO adsorption on magnesium oxide, nickel oxide and their solid solutions

Cited by 42 publications

References 0 publications

IR spectra of ozone adsorbed on MgO

IR spectra of ozone adsorbed on MgO

Probing the surfaces of heterogeneous catalysts by in situ IR spectroscopy

Effects of O2 on the Reduction of NO over Prereduced CaO Surfaces: A Mechanistic Understanding

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Product

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Effects of O₂ on the Reduction of NO over Prereduced CaO Surfaces: A Mechanistic Understanding