scholarly journals The kinetics of hœmoglobin V- The combination of carbon monoxide with reduced hœmoglobin

1934 ◽  
Vol 115 (795) ◽  
pp. 464-473 ◽  
Keyword(s):  
Carbon Monoxide ◽  
Experimental Methods ◽  
Experimental Results ◽  
Typical Experiment ◽  
Introductory Paper ◽  
Kinetics Of ◽  
Broad Outline

The theoretical aspects and importance of this reaction have already been discussed in the introductory paper of this series (part IV) as have also the experimental methods in broad outline. It will be assumed here that the reader is familiar with the paper. In the present paper will be found the experimental results of the tests suggested in part IV, together with an account of the effect of pn and temperature on the rate of combination of carbon monoxide with reduced hæmoglobin. It will be useful to describe first of all the results of a typical experiment at pH 10, temperature 21º C, [CO] = 0·1 mM, [Hb] = 0·06m M. These are plotted in fig. 1. It will be seen that the reaction is half complete in about 0·05 second and there is therefore no doubt that the apparatus is amply adequate for coping with the reaction, since in our previous papers we have shown that even reactions more than ten times as fast could still be accurately measured.

scholarly journals The kinetics of hœmoglobin VI -The competition of carbon monoxide and oxygen for hœmoglobin

1934 ◽  
Vol 115 (795) ◽  
pp. 473-495 ◽  
Keyword(s):  
Carbon Monoxide ◽  
Reverse Reaction ◽  
Experimental Part ◽  
Kinetics Of ◽  
Broad Outline

The experimental part of the research to be described below is given in two main sections. Of these Section 1 deals with the results obtained in measurements of the rate of displacement of oxygen from combination with hœmoglobin by carbon monoxide. Section 2 gives, in corresponding fashion, the results for the reverse reaction, namely, the displacement of carbon monoxide from combination with hœmoglobin by oxygen. The theoretical aspects of theses two reactions have already been dealt with in broad outline at the end of Part IV, with which it will be assumed that the reader is fully acquainted. Some further considerations, however, arise and these are given in Section 3 of the present paper.

Experimental methods for measurement of bond dissociation energies and heats of formation of radicals

1951 ◽  
Vol 207 (1088) ◽  
pp. 5-13 ◽  
Keyword(s):  
Experimental Methods ◽  
Experimental Results ◽  
Heats Of Formation ◽  
Bond Dissociation Energies ◽  
Carrier Gas ◽  
Bond Dissociation ◽  
Dissociation Energies ◽  
Kinetics Of

The paper describes a pyrolytic method of investigating the kinetics of gaseous reactions in which toluene is used as a carrier gas. It is shown that the method is particularly suitable for the determination of bond dissociation energies. The scope of the method is illustrated by various examples. A list of bond dissociation energies obtained is given. The manner in which the experimental results obtained can be cross-checked, is indicated and illustrated by examples. The effects of various constitutional factors on the bond dissociation energies are discussed.

Kinetic Study of the Pyrolysis of Formaldehyde

1972 ◽  
Vol 50 (7) ◽  
pp. 992-998 ◽  
Author(s):  
C. J. Chen ◽  
D. J. McKenney
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Carbon Monoxide ◽  
Kinetic Study ◽  
Pressure Range ◽  
Heterogeneous Reaction ◽  
Experimental Results ◽  
Arrhenius Parameters ◽  
Rate Laws ◽  
Kinetics Of

Kinetics of the thermal decomposition of pure formaldehyde were studied over a temperature range of 466–516 °C and a pressure range of ~ 50–160 Torr. Arrhenius parameters and rate laws were determined for carbon monoxide, hydrogen and methanol as follows:[Formula: see text]A mechanism is postulated which is qualitatively consistent with the experimental results but the activation energy for reaction 1[Formula: see text]is ~15 kcal/mol lower than predicted from recent thermochemical data, suggesting the possibility of a heterogeneous reaction.

Study of nickel-molybdenum catalysts for methanation of carbon monoxide

1980 ◽  
Vol 45 (3) ◽  
pp. 783-790 ◽  
Author(s):  
Petr Taras ◽  
Milan Pospíšil
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Mixed Oxides ◽  
Minor Component ◽  
Fast Neutrons ◽  
Scanning Calorimetry ◽  
Low Concentrations ◽  
Γ Rays ◽  
Molybdenum Catalysts ◽  
Kinetics Of

Catalytic activity of nickel-molybdenum catalysts for methanation of carbon monoxide and hydrogen was studied by means of differential scanning calorimetry. The activity of NiMoOx systems exceeds that of carrier-free nickel if x < 2, and is conditioned by the oxidation degree of molybdenum, changing in dependence on the composition in the region Mo-MoO2. The activity of the catalysts is adversely affected by irradiation by fast neutrons, dose 28.1 Gy, or by γ rays using doses in the region 0.8-52 kGy. The system is most susceptible to irradiation in the region of low concentrations of the minor component (about 1 mol.%). The dependence of changes in catalytic activity of γ-irradiated samples on the dose exhibits a maximum in the range of 2-5 kGy. The changes in catalytic activity are stimulated by the change of reactivity of the starting mixed oxides, leading to different kinetics of their reduction and modification of their adsorption properties. The irradiation of the catalysts results in lowered concentration of the active centres for the methanation reaction.

Kinetics of catalytic reduction of nitrogen oxide by carbon monoxide on CuO/Al2O3 catalyst

1983 ◽  
Vol 48 (11) ◽  
pp. 3202-3208 ◽  
Author(s):  
Zdeněk Musil ◽  
Vladimír Pour
Keyword(s):  
Carbon Monoxide ◽  
Nitrogen Oxide ◽  
Rate Equation ◽  
Catalytic Reduction ◽  
Zero Order ◽  
Spectroscopic Measurements ◽  
First Order ◽  
Ir Spectroscopic ◽  
Kinetics Of ◽  
Al2o3 Catalyst

The kinetics of the reduction of nitrogen oxide by carbon monoxide on CuO/Al2O3 catalyst (8.36 mass % CuO) were determined at temperatures between 413 and 473 K. The reaction was found to be first order in NO and zero order in CO. The observed kinetics are consistent with a rate equation derived from a mechanism proposed on the basis of IR spectroscopic measurements.

Kinetics of carbon monoxide methanation on a Ni/SiO2 catalyst

1990 ◽  
Vol 55 (7) ◽  
pp. 1678-1685
Author(s):  
Vladimír Stuchlý ◽  
Karel Klusáček
Keyword(s):  
Carbon Monoxide ◽  
Reaction Rate ◽  
Catalyst Activity ◽  
Adsorbed Hydrogen ◽  
Reaction Products ◽  
Co Methanation ◽  
Molar Ratios ◽  
Rate Determining Step ◽  
Higher Temperature ◽  
Kinetics Of

Kinetics of CO methanation on a commercial Ni/SiO2 catalyst was evaluated at atmospheric pressure, between 528 and 550 K and for hydrogen to carbon monoxide molar ratios ranging from 3 : 1 to 200 : 1. The effect of reaction products on the reaction rate was also examined. Below 550 K, only methane was selectively formed. Above this temperature, the formation of carbon dioxide was also observed. The experimental data could be described by two modified Langmuir-Hinshelwood kinetic models, based on hydrogenation of surface CO by molecularly or by dissociatively adsorbed hydrogen in the rate-determining step. Water reversibly lowered catalyst activity and its effect was more pronounced at higher temperature.

Kinetics of γ-alumina chlorination by carbon monoxide and chlorine

1982 ◽  
Vol 52 (1-3) ◽  
pp. 211-215 ◽  
Author(s):  
A. Tóth ◽  
I. Bertóti ◽  
T. Székely
Keyword(s):  
Carbon Monoxide ◽  
Kinetics Of
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