Surface chemistry of C-N bonds on Rh(111). 2. CH sub 3 NO sub 2 and C sub 2 H sub 5 NO sub 2

Journal Article · Thu Dec 28 04:00:00 EST 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100363a012· OSTI ID:6716758

Hwang, S Y; Kong, A C.F.; Schmidt, L D ^[1]

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1. Univ. of Minnesota, Minneapolis (USA)

The adsorption and decomposition of CH{sub 3}NO{sub 2} and C{sub 2}H{sub 5}NO{sub 2} on Rh(111) and C{sub 2}H{sub 5}NO{sub 2} on Pt(111) have been studied by using temperature-programmed desorption (TPD) and Auger electron spectroscopy (AES). TPD following adsorption of CH{sub 3}NO{sub 2} on Rh(111) produces complete decomposition with CO, N{sub 2}, H{sub 2}, and CO{sub 2} as major products, smaller amounts of CH{sub 4}, and trace amounts of HCN, NO, and H{sub 2}O. The major decomposition path of CH{sub 3}NO{sub 2} adsorbed on Rh(111) is therefore complete dissociation of the C-N and N-O bonds leaving adsorbed N and O atoms and surface CH{sub x} species which dehydrogenate between 500 and 640 K. This is in sharp contrast with Pt(111) on which no C-N bonds are broken and C{sub 2}N{sub 2} is the primary product. Thermal desorption of C{sub 2}H{sub 5}NO{sub 2} on Pt(111) at 300 K produces NO and H{sub 2} as major products, smaller amounts of CO and C{sub 2}N{sub 2}, and traces of C{sub 2}H{sub 4}, CO{sub 2}, and H{sub 2}O. The H{sub 2} desorption spectra from C{sub 2}H{sub 5}NO{sub 2} adsorption match those from C{sub 2}H{sub 4} adsorption on Pt(111). The major decomposition path of C{sub 2}H{sub 5}NO{sub 2} on Pt(111) is scission of the C-N bonds producing NO and leaving hydrocarbon.

• OSTI ID: 6716758
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:26; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
AUGER ELECTRON SPECTROSCOPY
CALCULATION METHODS
CHEMICAL EXPLOSIVES
CHEMICAL REACTIONS
DATA
DATA ANALYSIS
DECOMPOSITION
ELECTRON SPECTROSCOPY
ELEMENTS
EXPERIMENTAL DATA
EXPLOSIVES
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NITRO COMPOUNDS
NITROMETHANE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PLATINUM METALS
RHODIUM
SORPTION
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENTS