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Reaction Kinetics in Differential Thermal Analysis

A variety of global kinetic models are reviewed, including first-order, nth-order, nucleation, and sequential models as well as models having Gaussian, Weibull, and discrete activation-energy distributions. The important characteristics of these various models are outlined, with guidance in how to select the correct model. Some of the models have similar characteristics, and the parameter relationships among similar models are discussed. The comparison includes the relationship between conversion-dependent parameters determined by modified Friedman and Coats−Redfern isoconversion methods and reactivity distribution parameters determined by nonlinear regression of rate or fraction-reacted profiles. A new method for deriving discrete activation-energy distribution parameters having ln(A) = a + bE is also presented. Data accuracy requirements are discussed briefly. Kinetic analyses are given for a variety of materials, including synthetic polymers (polyethylene, polystyrene, polydimethylenenaphthalene, polys...

Global Kinetic Analysis of Complex Materials

Atmospheric Hg is present in different physical and chemical forms, which determine its atmospheric transformation and transport capacities The chemistry of Hg in flue gases is thus of importance for the deposition pattern around point source emissions In order to apply Hg cleaning methods in flue gases its speciation is also of importance To investigate this under realistic conditions, a 17 kW propane fired flue gas generator was used, while the kinetics of specific Hg reactions were investigated in a continuous flow reactor Elemental Hg is readily oxidized by Cl2 and HCl both at room and at elevated temperatures (up to 900 °C) but not by NH3, N2O, SO2 or H2S It reacts with O2 if a catalyst, such as activated carbon, is present A slow reaction between Hg and NO2 has also been noted

Chemical reactions of mercury in combustion flue gases

Information about the composition of heavy-end petroleum distillates is needed because of the increased use of this material as an energy source. The complexity of the heavy ends requires extensive separation to give fractions amenable to compositional studies. A separation scheme is described that separates heavy-end petroleum distillates into acid, base, neutral-nitrogen, saturate, and aromatic fractions. The analytical techniques used include anion- and cation-exchange chromatography, coordination chromatography, and adsorption chromatography. The scheme has been applied to heavy-end distillates from a variety of crude oils having different compositional characteristics. Data from mass spectral analysis of the saturate and aromatic fractions are presented.

Ion-exchange, coordination, and adsorption chromatographic separation of heavy-end petroleum distillates

The thermal stability of molten nitrite/nitrates salt for solar thermal energy storage in different atmospheres

Differential Thermal Analysis of Inorganic Compounds

The Application of the Absolute Rate Theory to the Ignition of Propagatively Reacting Systems. The Thermal Ignition of the Systems Lithium Nitrate–Magnesium, Sodium Nitrate–Magnesium

Saul. Gordon

Papers

Differential Thermal Analysis of Inorganic Compounds

The Application of the Absolute Rate Theory to the Ignition of Propagatively Reacting Systems. The Thermal Ignition of the Systems Lithium Nitrate–Magnesium, Sodium Nitrate–Magnesium

Automatic Recording Buret

Automatic and Recording Balances

Electronic Conversion for Graphic Recording with the Chevenard Photographically Recording Thermobalance