Enthalpy of oxidation

The oxidation of a hydrocarbon to hydroperoxide is an exothermic reaction. The values of the enthalpies of these reactions are collected in Table 1.4. The enthalpies of oxidation of different hydrocarbon groups by dioxygen to ROOH have the following values ... 

Figure 9.12 (a) Enthalpy of oxidation of Lai xAxB03, 5 as a function of x. Open symbols represents values deduced from non-stoichiometry versus partial pressure isotherms. Closed symbols represent calorimetric values, (b) Comparison of experimental and calculated non-stoichiometry versus partial pressure isotherms [23], Reproduced by permission of the Royal Society of Chemistry. 

Enthalpies of oxidation of stoichiometric and even non-stoichiometric oxides may similarly be obtained by heating reduced oxides in air in an adiabatic calorimeter to a temperature at which the oxidation proceeds sufficiently fast [56] ... 

Correlations between catalytic activity and a variety of bulk properties of semiconductors have been reported (i) the average band gap of III-V and II-VI semiconductors and activity towards hydrogenation of isopropanol (ii) enthalpy of oxides and their activity towards oxidation of propylene and (iii) number of d-electrons (and crystal field stabilization energy) or 3rf-metal oxides and their activity towards N2O decomposition. The last correlation, due to Dowden (1972), is important since it provides a connection between heterogeneous catalysis and coordination chemistry of transition-metal compounds. A correlation between the catalytic activity of transition-metal sulphides towards hydrodesulphurization of aromatic compounds and the position of the transition metal in the periodic table has been made by Whittingham ... 

The described properties are in good agreement with the current concept of the structure. The compounds are white amorphous powders, insoluble in all solvents except by decomposition. With aqueous ammonia or caustic alkalis, hydrogen is evolved. With abrupt mechanical or thermal shock, explosive decomposition may occur, in which the enthalpy of oxidation of the Si-Si bonds to Si-0 bonds is released. 

Oxidative addition of C-X bonds to Pd is an exothermic reaction, at least in the cases studied so far. From a theoretical point of view, it is important to note that relativistic effects are essential for the accurate theoretical prediction of the reaction enthalpy of oxidative addition, while the influence on the activation barriers appears to be much smaller [11]. These effects can nowadays be included in a standard way using commonly available program packages. 

Correlation between selected values of E, for decompositions of oxalates and mellitates with the enthalpies of oxide formation [108] (some mean values of E, are included). The magnitudes of E, thus appear to be controlled by the strengths of the M-0 bonds. Two trends may be discerned. Reactions where breakdown of the oxalate anion are believed to be catalytically promoted by the metal product, have slightly lower E, values ( ), compared to reactions in which the residual product does not promote decomposition, including the mellitates where carbon deposition inhibits catalysis (+). 

This may be concluded from comparisons involving the enthalpies of oxidative addition of 0-O2C6GI4, etc. to analogous Rh and Ir... 

Complexation reactions of 4+ ions, reactions (10) and (11), are not oxidation-reduction reactions and have been interpreted above as acid-base reactions. Since those reactions are favorable, one may calculate the enthalpies of oxidation-reduction reactions such as... 

Oxide Ion Conductor, Fig. 3 Maximum oxide ionic conductivity and apparent enthalpy of oxide ion transpoit as a function of ionic size of dopant... 

Where SI% is stabilization index percentage, ah is the enthalpy of oxidized PAN nanofibers and is the enthalpy of raw PAN nanofibers. 

A measure of the thermodynamic stability of various Ir(III) compounds has been obtained by Yoneda and Blake, who have measured enthalpies of oxidative addition of I2, HI, and various alkyl and acyl iodides to... 

Janvier et a/." determined a value of -4.18 eV for the partial molar enthalpy of oxidation ( ) of nanocrystalline ceria by... 

A misprint in the corresponding Eq. (21) in Kim et has been corrected here (ln(a T) rather than In (ct , )), and the activation energy of the electronic conductivity in the bulk has been substituted by the partial molar enthalpy of oxidation and the migration enthalpy, using the relation in Eq. (12.34),... 

Heats and enthalpies of oxidation of cis- and trans-3-t-butylthietan 1-oxides to the 1,1-dioxides by perlauric acid at 298 K have been determined. The structures of cis-2,4-diphenylthietan l-oxide and the seven-co-ordinate complex of 3,3-dimethylthietan 1-oxide with the shift reagent Eu(dpm)3 have been established by X-ray analysis. The mass spectrum of thietan 1-oxide shows fragmentation to CsHs and... 

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