The review is a summary and analysis of the data characterizing CO adsorption on surface cationic sites of oxides including supported materials and microporous and mesoporous materials. The contributions of various types of CO bonding to the IR frequency shifts of carbon-bonded molecules are analyzed, namely, the increase of the CO stretching frequency in cases of electrostatic and σ bonding and the decrease of the frequency with π bonding. Polycarbonyls, bridging CO, oxygen-bonded CO, and tilted CO are also considered. The main part of the review is a collection of the experimental results characterizing carbonyls of individual metal ions. The spectral behavior of CO bonded to metal atoms is also assessed in the cases when the metal ions are easily reduced to metal (Cu, Ag, Au, Pd, or Pt) or cationic carbonyls are produced after CO adsorption on supported metals (Ru, Rh, Ir, and Os). The interaction of CO with surface OH groups is also considered. It is demonstrated that IR spectroscopy of adsorbed CO is an efficient methodology to characterize cationic surface sites in terms of their nature, oxidation states, coordination environment and coordinative unsaturation, and location at faces, edges or corners of microcrystallites. When applied to materials with surface hydroxyl groups CO undergoes hydrogen bonding and information can be collected on the proton acid strength.

Characterization of oxide surfaces and zeolites by carbon monoxide as an IR probe molecule

The last 15 years of hydroformylation and carbonylation chemistry are reviewed, including technical and commercial aspects.

Progress in hydroformylation and carbonylation

Although the use of CO as a reductant had been in the past confined to few reactions, its use in organic synthesis, especially in the reductive carbonylation of nitro aromatics and the oxidative carbonylation of aromatic amines, has increased dramatically. Since the discovery of CO-induced reduction of nitro groups, there has been a wide spread increase of interest in the application and mechanistic understanding of this reaction. In a major review published in 1988 it was noted, that in practice no studies of the mechanism of N-carbonylation of aromatic nitro compounds with alcohols leading to carbamates have been carried out. This review clearly shows a major change since that publication. Indeed, metal-catalyzed reductive carbonylation of nitro aromatics using CO as reducing agent has been in the past 10 years the subject of intense investigation both in academia and in the chemical industry. Several articles and reviews have covered the subject up to the late 1980s. The authors will concentrate on more recent literature, but sometimes older data will be used to establish an understanding of these reactions. 127 refs.

A Review of the Selective Catalytic Reduction of Aromatic Nitro Compounds into Aromatic Amines, Isocyanates, Carbamates, and Ureas Using CO.

Surface hydroxyl groups are active centers in many catalytic reactions and can play an important role during catalyst preparation. In this chapter, the application of infrared spectroscopy for identification and characterization of surface OH groups is reviewed. The potential of other techniques is also briefly described. The vibrational signature of various types of hydroxyls is discussed; however, the amount of information that can be gathered from the hydroxyl spectra itself is limited. In contrast, application of probe molecules allows a profound characterization of hydroxyl species. Two scenarios are considered: the formation of H-bonds between hydroxyl groups and probe molecules, and chemical reactions between hydroxyl groups and molecules or ions (such as protonation of basic probe molecules, exchange reactions, redox processes). Means to explore the accessibility and location of hydroxyl groups are introduced. The properties of OD and OH groups are compared, and the application of H/D exchange as a diagnostic reaction is discussed. Finally, the hydroxyl population on materials of practical interest is analyzed.

Identification and Characterization of Surface Hydroxyl Groups by Infrared Spectroscopy

FTIR Study of CO Interaction with Ru/TiO2Catalysts

Surface supported metal cluster carbonyls. Chemisorption, reactivity, and decomposition of Ru3(CO)12 on silica

Catalysis by palladium salts: XIII. The reductive carbonylation of nitroaromatic compounds to isocyanates with PdII and Pd0 complexes as homogeneous catalysts

[Rh(CO)2X]2 (X = Cl, CH3COO) species suported on highly decarbonated magnesium oxide: observation of a strong effect of chloride ion on the surface organometallic chemistry

Surface-supported metal carbonyl clusters: an IR investigation of the behaviour of Rh6(CO)16 supported on highly decarbonated magnesium oxide

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Surface supported metal cluster carbonyls. Chemisorption, reactivity, and decomposition of Ru3(CO)12 on silica

Catalysis by palladium salts: XIII. The reductive carbonylation of nitroaromatic compounds to isocyanates with PdII and Pd0 complexes as homogeneous catalysts

[Rh(CO)2X]2 (X = Cl, CH3COO) species suported on highly decarbonated magnesium oxide: observation of a strong effect of chloride ion on the surface organometallic chemistry

Surface-supported metal carbonyl clusters: an IR investigation of the behaviour of Rh6(CO)16 supported on highly decarbonated magnesium oxide