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The synthesis of a boron-substituted polyaromatic mesophase was studied by copyrolysis of a filtered coal tar pitch with pyridine-borane under a 1 MPa argon atmosphere. The pyrolysis temperature was varied between 360 and 420°C, the boron content of the pitch-pyridine-borane mixture was increased step by step up to 5%. Pyridine-borane is decomposed above 120°C; the pyridine is volatilized, and the...
A spherulitic mesophase pitch with about 50 vol% mesophase has been synthesized by an iron-catalyzed pyrolysis of a coal tar pitch. The isotropic pitch is removed to various extents by solvent extraction. The thermoplasticity of the resulting raw mesophase powders is adjusted by treatment with oxygen with respect to optimum sintering properties. After milling of these powders to a particle sized...
Iron benzoate and naphthoate were studied as catalyst precursors of an iron-catalyzed pyrolysis of a coal-tar pitch as a technical hydrocarbon mixture and of anthracene as an aromatic model compound. The results are compared with those obtained with ferrocene, which has been studied previously. Both iron compounds are decomposed by formation of iron clusters at a much lower temperature than ferrocene...
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