Absorption carbon monoxide

Because the solution is capable of absorbing one mole of carbon monoxide per mole of cuprous ion, it is desirable to maximize the copper content of the solution. The ammonia not only complexes with the cuprous ion to permit absorption but also increases the copper solubiUty and thereby permits an even greater carbon monoxide absorption capacity. The ammonia concentration is set by a balance between ammonia vapor pressure and solution acidity. Weak organic acids, eg, formic, acetic, and carbonic acid, are used because they are relatively noncorrosive and inexpensive. A typical formic acid... 

Carbon monoxide absorption on the transition metals Metal carbonyls... 

C CIDNP effects (Figure 8) were detected for the carbonyl carbon of the initial 9 (emission, Sq 249.8) and carbon monoxide (absorption, Sq 183). Polarization of the carbonyl carbon is evidence for the formation of acyl type radicals COR and, in principle, proves that photodecomposition of 9 follows Norrish Type I cleavage resulting in SnPrs and COCHMe2 radicals. This conclusion is also supported by Sn CIDNP effects of the initial a-tin ketone and the organotin products of its photodecomposition (Table 4 and Figure 9). 

Carbon monoxide absorption may be clinically important in the presence of coronary heart disease (see above) although it is physiologically insignificcint in healthy young adults. 

IR spectroscopy was used to obtain insights on the carbon monoxide absorption and oxidation mechanism on Pt-Ru electrocatalysts. Figure 17 shows the SNIFTIR spectra of CO on submonolayer Pt deposits on Ru(OOOl). Two bipolar bands are clearly visible at potentials from 0.1 to 0.8 V. Analyses of IR spectra (vide supra) attributed the bipolar band at lower frequencies to bhie-sliifted CO (i.e., moved to higher frequency) on polycrystalline Ru, whereas the higher-frequency bipolar band represents red-sliifted CO onPt(lll). ... 

Reduction of NbCl5 occurs rapidly, as denoted by the change in color of the reaction mixture from yellow-orange to violet and then blue. When the reaction mixture is greenish, a fast carbon monoxide absorption starts, and continues at an approximate rate of 2 L/hr up to a molar CO/Nb ratio of about tbree. After that, a considerable decrease in the gas absorption rate is noted. The reaction mixture is vigorously stirred for about 30 hours when the molar CO/Nb ratio reaches approximately six. The red-brown suspension is decanted after about 12 hours, and then filtered under an atmosphere of carbon monoxide." ... 

BeUi, R. and V. Giuliani Carbon monoxide poisoning, carbon monoxide from tobacco smoking in the blood, and chronic carbon monoxide absorption Polio Med. 38 (1955) 351-358. 

As in many other cases in modem science the discovery of cytochrome P450 and its biological role followed a sequence of apparently not directly related findings. It started in 1958 with the description by Garfinkel and Klingenberg of a pigment in the microsomal fraction liver which was characterized by an unusual carbon monoxide absorption difference spectrum with a peak at 450 nm. This finding was made possible by the sophisticated spectrophotometiic techniques for turbid solutions developed by B. Chance at the Johnson Research Foundation in Philadelphia. A typical difference spectmm of reduced microsomes with carbon monoxide is shown in Fig. 1. 

Reaction 16-23 has been proposed by van Krevelen and Baans (1930) as the principal carbon monoxide absorption-desorption mechanism. 

A simplified flow diagram of a COSORB unit is shown in Figure 16-24. The overall pnKess generally includes (1) feed gas preparation, (2) carbon monoxide absorption (com-plexing), (3) carbon monoxide desorption (decomplexing), (4) aromatic solvent recovery from effluent gas streams, and (5) compression of CO product stream. Steps (1) and (5) are not shown on the flow sheet. 

---