The purpose of this study was to obtain greater accuracy in the measurement of the heat of reaction by combining data from various thermal analysis techniques. Conventional equations that calculate heat of reaction are limited because they do not take in to account mass change. Therefore, an enhanced equation was developed to integrate mass (weight) change to provide greater accuracy. The path chosen to implement this new equation employed simultaneous Thermogravimetric / Differential Thermal Analysis (TG/DTA) that could provide both ΔT and weight data simultaneously. Computer programs were written in C and Pascal languages to provide communication capabilities between computers and to calculate heat of reaction using various equations. This included a qualitative to quantitative (ΔT to ΔH) conversion which was performed to the DTA data file to which the enhanced equation was applied. Various samples were used to test and monitor the performance of the developed equations.

Since all the nitrogen compounds that have been identified in coal-derived liquids in the past have been basic in character, the effect of an acid-wash on the nitrogen content of coal-derived liquids was examined. Because sulfuric acid is the cheapest of the commerical strong acids, it was the natural choice, and its use was examined in detail. The greater the concentration of the sulfuric acid used, the greater the amount of nitrogen removed. :he sulfur compounds in coal-derived liquids were not removed noticeably by extraction with sulfuric acid. Column chromatography is a possible technique for removal of nitrogen compounds. The sulfur content was not changed by the column chromatography method. Although the sources of coal were different, they were found to respond to both acid extraction and column chromatography.

The purpose of this research is to determine the contact potential of cuprous oxide, Cu2O, with respect to gold. A band model for cuprous oxide is presented. Single-crystal cuprous oxide is prepared from Oxygen Free High Conductivity copper equilibrated at 120°C and at atmospheric pressure. The contact potential difference of cuprous oxide (using gold as a reference) is measured in a bakeable ultrahigh vacuum system using a modified version of Nelson's electron beam retardation method. Measurements made at 10-6 torr and at room temperature give a value of 0.1 +/-0.05 eV for the contact potential difference of cuprous oxide with respect to gold. Photoelectric emission from the gold reference is approximately 4.9 eV. Hence, the Fermi level resides at approximately 5 eV below vacuum zero. This places the Fermi level between the valence band which was found to be at approximately 5.1 eV and the acceptor levels which reside somewhere between 0.3 eV and 0.6 eV above the valence band. From optical experiments the band width has been determined to be approximately 2.3 eV. If 5.1 eV is taken as the top of the valence band and 2.3 eV is the band gap, then the electron affinity of cuprous oxide is approximately 2.8 eV.

The rate of reduction of [Co(dipy)3]3+ by [Co(tripy)2]2+ has been examined in six nonaqueous solvents and water. The kinetic results in these solvents were compared with those obtained in nine other solvents where the same reaction was investigated. Activation parameters were obtained over a temperature range of 5° to 50°C with the ionic strength at 0.0027 or 0.0046 M. The slowest rate of electron transfer was found in acetonitrile while the fastest occurred in acetophenone, the solvent of lowest dielectric constant. A linear correlation between ln k and the reciprocal dielectric constant of the solvent was obtained for most solvents when corrections for differences in ionic strength and free energy drive were made. Only nitromethane and acetonitrile exhibited marked deviations from linearity. Solvent properties such as viscosity, refractive index, surface tension, and density had little if any effect on the redox rate. The redox rate constants in the aprotic aromatic solvents, nitrobenzene, benzonitrile, and acetophenone paralleled the free energy drive of their respective reactions. No such trend was found with the other solvent groups. In fact, the polar solvents exhibited nearly the reverse trend. The kinetic results of this study have been interpreted in terms of the theoretical predictions of Marcus. The effects of ionic strength and ion pairing in the different solvents have also been discussed.

There have been several studies made on the effects of various central metal ions on the aggregation of tetrasulfonated Phthalocyanine dye complexes in aqueous solution, but there have been no studies made on the aggregation of the nickel(II)-4, 4', 4", 4'"-tetrasulfoohthalocyanine (NiII-TSPC) complex. Therefore, a study of the effects of nickel(II) on the aggregation of its aqueous tetrasulfonated Phthalocyanine dye complex was Proposed so that a comparison might be made with nrevious studies of central metal ion effects. It was found, however, that NiII-TSPC gives a much higher degree of aggregation in water than the metal complexes Previously studied and that common equilibria were absent in the concentration range of 1.0 x 10-3 to 1.0 x 10-7 M. The spectra indicated the presence of a single species in this concentration range. Therefore, a comparison of the effects of nickel (IT) on the aggregation of tetrasulfonhthalocyanines in aqueous solutions could not be made with analogous dye systems examined previously using other transition metals. A study of the literature revealed that there have been no studies made on the effects of a pure organic solvent on the aggregation of transition metal complexes of tetrasulfonhthalocyanine dyes. Therefore, this study was made to determine such solvent effects on the NiII-TSPC complex.

The oxidative instability of coal liquids is a possible problem for the utilization of these alternate fuels. Past experience with both petroleum and coal-derived distillates indicates that heteroatomic species are intimately involved in such degradation. However, the exact nature of the chemistry is, in many cases, unclear. The goal of this work is to study the role of phenols in the chemistry of oxidative degradation of naphthas from a variety of current conversion processes. The effects of exposure to oxygen, metal surfaces, and metal salts have been investigated in order to identify the major routes leading to gum formation. Coal-derived naphthas were aged under 02 and N2 as received and in contact with copper or cuprous chloride at various temperatures. The rate of 02 consumption was measured manometrically, and compositional changes were monitored via infrared, nuclear magnetic resonance, and mass spectrometry. The observed rates of 02 consumption, catalytic effects, and compositional changes were analyzed to identify the major chemical reactions responsible for precipitate formation.

The conversion of methane into methanol is viewed as one approach to utilizing the vast reserves of natural gas. One such prospect for the utilization of natural gas is the partial oxidation of methane to methanol. Methanol ranks high on the commodity market. As a liquid it is easily transportable and therefore skirts the issue of vast amounts of a gas having to be transported either by pipeline or by liquifying. The catalytic partial oxidation of methane to methanol is investigated. Two different reactor systems are employed. The first system is a fixed bed system. The second is a fluid bed system. Areas to be addressed are different catalyst systems, different loading rates, elemental promotion, different supports, surface area, catalyst particle mesh size, and effects of preparation.

Redox rates between polypyridyl osmium (II) complex, OsCl(py)3(bipy)+, with tris(1,10-phenanthroline) cobalt (III), Co(phen)33+, and Ce(IV) were examined in aqueous solution. Both reaction systems exhibited second order kinetics. The osmium (II) - cobalt (III) redox reaction was found to have a rate constant of 2.3 x 105 M-1 sec-1 at 22°C and µ = 0.003M from which the isotopic electronic exchange rate constant for the OsCl(py)3(bipy)+/2+ system was estimated to be 1.5 x 109 M-1sec-1. Ionic strength effects on the Ce(IV) - Os(II) redox reaction were studied as well as the effects of Ce(IV) and NaN03 concentrations on the solution pH. The redox rate constant was 52 M-1sec-1 at 22°C and µ = 0.01M. The reaction rate decreased with increasing ionic strength and a Bronsted plot was consistent with Ce(IV) present as Ce(NO3)5(OH)23-. Activation parameters were determined and a mechanism of electronic transfer was proposed for each system. The Os(II) - Co(III) redox reaction is believed to occur via an outer-sphere mechanism while an inner-sphere mechanism was proposed for the Os(II) - Ce(IV) system. Since relatively high acid concentrations were used in the Ce(IV) - Os(II) study, the acid hydrolysis rate of the Os(II) complex was measured and found to be sufficiently slow so as not to interfere with the redox rate. This reaction exhibited third-order kinetics.

An alternate solution for the two-dimensional Ising model in a zero external magnetic field is presented. Following Kaufman, the partition function is written as the trace of a certain matrix product. The trace can be evaluated by computing the determinant of a related matrix. The determinant is evaluated by finding the product of its eigenvalues; in the thermodynamic limit the result is equivalent to that found by Onsager.

The technique of x-ray photoelectron spectroscopy (XPS) has been applied to characterize iron-manganese catalysts used in Fischer-Tropsch synthesis. The catalysts, which vary in composition from 10 FE/90 Mn, to 50 Fe/50 Mn are analyzed after being placed in a slurry reactor and having synthesis gas reacted over them. Changes, in catalyst composition are investigated further using in situ techniques. Additionally, 20 Fe/80 Mn catalysts containing potassium in the range of 0.1 wt.% to 1.3 wt.% are analyzed in the same manner. These studies have permitted the identification of some of the factors influencing activation and deactivation, product selectivity, and surface speciation.