US EPA

1183134 

Journal Article 

TPD, HREELS and UPS study of the adsorption and reaction of methyl nitrite (CH3ONO) on Pt(111) 

Peck, JW; Mahon, DI; Beck, DE; Bansenaur, B; Koel, BE 

1998 

1 

Surface Science
ISSN: 0039-6028 

410 

2-3 

214-227 

10.1016/s0039-6028(98)00284-2 

WOS:000075528100015 

The adsorption and reaction of methyl nitrite (CH,ONO, CD,ONO) on Pt(lll) was studied using HREELS, UPS, TPD, AES, and LEED. Adsorption of methyl nitrite on Pt(lll) at 105 K forms a chemisorbed monolayer with a coverage of 0.25 ML, a physisorbed second layer with the same coverage that desorbs at 134 K, and a condensed multilayer that desorbs at 117 K. The Pt(lll) surface is very reactive towards chemisorbed methyl nitrite; adsorption in the monolayer is completely irreversible. CH3ONO dissociates to form NO and an intermediate which subsequently decomposes to yield CO and H-2 at low coverages and methanol for CH3ONO coverages above one-half monolayer. We propose that a methoxy intermediate is formed. At least some C-O bond breaking occurs during decomposition to leave carbon on the surface after TPD. UPS and HREELS show that some methyl nitrite decomposition occurs below 110 K and all of the methyl nitrite in the monolayer is decomposed by 165 K. Intermediates from methyl nitrite decomposition are also relatively unstable on the Pt(lll) surface since coadsorbed NO, CO and H are formed below 225 K. (C) 1998 Elsevier Science B.V. All rights reserved. 

auger electron spectroscopy (AES); chemisorption; low energy electron diffraction (LEED); low index single crystal surfaces; methylnitrite; platinum; thermal desorption spectroscopy; visible and ultraviolet photoelectron spectroscopy