A comparison of single-, double-, triple-bonded and aromatic CN compounds on Pd(111) and (100) I. Hreels of NCCN, ethylenediamine and s-triazine

Kordesch, Martin E.; Stenzel, W.; Conrad, H.

doi:10.1016/s0039-6028(87)80396-5

Cited by 69 publications

(24 citation statements)

References 45 publications

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“…It has been found that CN can adsorb in a side-on, end-on or parallel geometries depending on the metal surface. HREELS and NEXAFS studies confirm a CN parallel geometry on Pd(1 0 0), Pd(1 1 1) [5][6][7], Ni(1 1 0) [3,4], Rh(1 1 0) [26] and Cu(1 1 1) [29] in vacuum medium. However, it has been established that the most favourable adsorption on Pt (1 1 1) is the C-down on-top one.…”

Section: Introductionmentioning

confidence: 69%

“…Its chemistry is of fundamental interest for large-scale industrial processes such as the Andrussov process [2] for the synthesis of HCN and in the context of catalytic automotive converters. Experimentally, adsorption of CN has been studied on several metals as Ni [3,4], Pd [5][6][7], Pt [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22], Rh [23][24][25][26], Ru [27,28], Cu [29][30][31][32] or Au [33][34][35], either in electrochemical cells and in vacuum medium. However, and contrarily to analogue species as CO or NO, no energetic data for CN adsorbed on platinum is known, only the vibrational frequency has been reported.…”

Section: Introductionmentioning

confidence: 99%

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Structure and bonding mechanism of cyanide adsorbed on Pt(111)

2004

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Section: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Structure and bonding mechanism of cyanide adsorbed on Pt(111)

2004

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“…HREELS and NEXAFS measurements give clear evidence that CN is adsorbed parallel to the surface on Pd(111). 9,26 Flat-lying CN is neither observable by EELS in the dipole scattering mode nor by IR spectroscopy. This might be the reason this species was overlooked in adsorption and decomposition studies of CH 3 -NC on both Al 2 O 3 supported Rh and Rh(111).…”

Section: Discussionmentioning

confidence: 99%

C−N Coupling in Reactions between Atomic Nitrogen and Ethylene on Rh(111)

1997

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Reactions between adsorbed atomic nitrogen and ethylene on Rh(111) have been investigated by temperatureprogrammed reaction spectroscopy (TPRS), secondary ion mass spectrometry (SIMS), and work function measurements. Coadsorption of a small amount of ethylene to 0.10 monolayer of atomic nitrogen results in the formation of a surface cyanide species, which is detected by SIMS through the Rh 2 CN + cluster ion. Cyanide formation has been followed by measuring the decrease of the atomic nitrogen and carbon coverages and the accompanied increase in the CN coverage in temperature-programmed SIMS experiments. The CN formation kinetics is described by a preexponential factor and an activation energy of 10 11(1 s -1 and 111 ( 10 kJ/mol, respectively. In the absence of surface hydrogen, CN groups are stable up to ∼700 K. CN decomposition results in reaction-limited desorption of N 2 with a maximum at 800 K and is described by a preexponential factor and an activation energy of 10 13(1 s -1 and 210 ( 15 kJ/mol. Coadsorption of large amounts of ethylene to 0.10 monolayer of N ads results in the desorption of almost all nitrogen in the form of HCN between 500 and 700 K. Cyanogen was also observed as a reaction product although the selectivity was small, 3% at maximum. Work function measurements indicate that surface cyanide is present as a negatively charged species on the Rh(111) surface.

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“…This leads to a tilt of the C-N axis out of the surface which falls in the range 18-25 for these three different substrates. In addition, spectroscopic data (mainly high-resolution electron energy loss spectroscopy -HREELS) has been interpreted as indicating that CN adsorbs with its molecular axis essentially parallel to the surface on Pd(100) [99,100], on Ru(0001) [101] and on Cu(111) [102].…”

Section: Nitrogen-containing Speciesmentioning

confidence: 99%

The local structure of molecular reaction intermediates at surfaces

Woodruff

2008

Chem. Soc. Rev.

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A review is presented of the results of (experimental) quantitative structural studies of molecular reaction intermediates at surfaces; i.e. molecular species that do not exist naturally in the gas phase and, in most cases, are implicated in surface catalytic processes. A brief review of the main experimental methods that have contributed to this area is followed by a summary of the main results. Investigated species include:carboxylates, RCOO-(particularly formate, but also deprotonated amino acids); methoxy, CH 3 O-, carbonate, CO 3 ; ethylidyne, CH 3 C-; NH x and SO x species; cyanide, CN. As far as possible in the limited range of system studied, a few general trends are identified.2

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A comparison of single-, double-, triple-bonded and aromatic CN compounds on Pd(111) and (100) I. Hreels of NCCN, ethylenediamine and s-triazine

Cited by 69 publications

References 45 publications

Structure and bonding mechanism of cyanide adsorbed on Pt(111)

Structure and bonding mechanism of cyanide adsorbed on Pt(111)

C−N Coupling in Reactions between Atomic Nitrogen and Ethylene on Rh(111)

The local structure of molecular reaction intermediates at surfaces

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