Isocyanate intermediates in the reaction of NO and CO over noble metal catalysts

Unland, Mark L.

doi:10.1016/0021-9517(73)90318-7

Cited by 184 publications

(75 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The interaction of nitric oxide with supported rhodium catalysts has been reported previously (11)(12)(13)(14)(15). These studies have utilized infrared spectroscopy (IR) and inelastic electron tunneling spectros copy (lETS) to examine the interaction of nitric oxide with rhodium sup ported on various transition metal oxides, predominantly AlgO^.…”

Section: Reactant/product-catalyst Interactionsmentioning

confidence: 98%

“…This implies that nitric oxide does not dissociate upon adsorption at room temperature on the Rh(331) surface. After a 1 L exposure of NO, the sample was flashed to 12 450 K, the molecularly adsorbed nitric oxide dissociated, and the surface nitrogen desorbed as molecular nitrogen, leaving behind a surface oxide (10). This was confirmed by both HREELS and AES.…”

Section: Reactant/product-catalyst Interactionsmentioning

confidence: 99%

“…The adsorption of nitric oxide on alumina-supported rhodium has been examined by several groups (11)(12)(13)(14). Arai and Tominaga (14) examined the adsorption of nitric oxide at a pressure of 6.6 x 10^ Pa, and at several temperatures.…”

Section: Reactant/product-catalyst Interactionsmentioning

confidence: 99%

“…In par ticular, the adsorption of carbon monoxide on rhodium metal has been studied extensively, and was most recently reviewed by Dubois and Somorjai (20). The adsorption of carbon monoxide has been recently studied on supported rhodium catalysts (11,12,14,15,21,22), polycrystal1Ine rhodium wire (6,23,24), and on the Rh(lOO) (7,25), Rh(llO) (8), Rh(in) (7,20,(26)(27)(28)(29)(30), Rh(33l) (9,10), and Rh(755) (9) single crystal surfaces. Since the adsorption of carbon monoxide on rhodium metal has been reviewed recently (20), only those results pertinent to this study will be discussed in the following section.…”

Section: Reactant/product-catalyst Interactionsmentioning

confidence: 99%

See 3 more Smart Citations

Reduction of nitric oxide with carbon monoxide on the Rh(100) single-crystal surface

HENDERSHOT

1986

Journal of Catalysis

View full text Add to dashboard Cite

Section: Reactant/product-catalyst Interactionsmentioning

confidence: 98%

Section: Reactant/product-catalyst Interactionsmentioning

confidence: 99%

Section: Reactant/product-catalyst Interactionsmentioning

confidence: 99%

Section: Reactant/product-catalyst Interactionsmentioning

confidence: 99%

See 2 more Smart Citations

Reduction of nitric oxide with carbon monoxide on the Rh(100) single-crystal surface

HENDERSHOT

1986

Journal of Catalysis

View full text Add to dashboard Cite

“…In the NO + CO reaction on supported metals isocyanate, NCO, species has been detected by means of infrared spectroscopy. [1][2][3][4][5][6] Subsequent works disclosed several details on the chemistry of NCO species. [7][8][9][10][11][12] These are as follows: (1) the asymmetric stretch of NCO sensitively depends on the nature of the support; the highest frequency, 2305 cm -1 , was registered on silica, and the lowest one at 2210 cm -1 was registered for titania-supported Pt metals.…”

Section: Introductionmentioning

confidence: 99%

Surface Chemistry of HNCO and NCO on Pd(100)

2006

View full text Add to dashboard Cite

The interaction of HNCO with Pd(100) has been studied with reflection absorption infrared spectroscopy. Following the adsorption of HNCO at 100 K, a fraction of the adsorbed HNCO desorbs at 115-125 K and another part dissociates at 120-140 K yielding adsorbed H and NCO species. NCO locates in top-site position having significant lateral repulsive interaction between them. On clean surface, the NCO species was found to decompose readily to adsorbed CO and N on warming to 300 K. Preadsorbed oxygen atoms resulted in the significant stabilization of NCO; the asymmetric stretch of it was detected up to 380 K. Neither NCO nor HNCO were identified in the NO + CO reaction even at high pressure (1-10 mbar) and at elevated temperature (500-650 K). The presence of hydrogen did not help the formation of this species.

show abstract

The Formation of Isocyanates on Noble Metals and Supported Noble Metal Catalysts

Wicke

1988

Ber Bunsenges Phys Chem

View full text Add to dashboard Cite

The formation of support-NCO and noble metal-NCO groups on oxide supported noble metal catalysts and high area evaporated metal films during the NO/CO reaction was studied by FTIR spectroscopy. With SiO₂ and Al₂O₃ as supports the results reported in the literature were essentially reproduced. With TiO₂ and ZrO₂ absorption bands in the region between 2000 and 2100 cm^-1 were detected, which had not been described before. On evaporated metals NCO-groups could be detected in situ. They are located at 2185 cm^-1 for Pd and at 2170 cm^-1 for Pt. Based on kinetic measurements the spillover of NCO-groups from the noble metal to the support is proposed as a mechanism for support-NCO formation. For this spillover a connection between support and noble metal is necessary, which is formed during hydrogen treatment at elevated temperatures. This connecting species could be a noble metal/support intermetallic phase, as Pd₃Ti resp. Pt₃

show abstract

Isocyanate intermediates in the reaction of NO and CO over noble metal catalysts

Cited by 184 publications

References 5 publications

Reduction of nitric oxide with carbon monoxide on the Rh(100) single-crystal surface

Reduction of nitric oxide with carbon monoxide on the Rh(100) single-crystal surface

Surface Chemistry of HNCO and NCO on Pd(100)

The Formation of Isocyanates on Noble Metals and Supported Noble Metal Catalysts

Contact Info

Product

Resources

About