Abstract
AbstractPropane cracking has been carried out in argon, in the presence of either aluminum or tungsten vapor as well as condensed particles of the same metals. The cracking reaction was taking place in the homogeneous phase of a carbon/hydrogen system, yielding mainly acetylene and hydrogen. Propane/argon molar ratios of 1.5 and 6.0% were used, associated with aluminum or tungsten, in concentrations ranging from 0.02 to 0.75%. Maximum acetylene yields up to 93% were obtained in the presence of metal vapor, against a maximum attainable value of around 67% without metal vapor in the plasma. Also, the optimum temperature required for maximum conversion markedly decreased in the presence of metal vapor.Maximum conversion values occurring around 4,000°K in the presence of aluminum or tungsten, associated with similar crystalline structures related to these metals, lead to the assumption of a solid catalytic effect promoted by condensed metal vapor in the quenching phase. Also, a strong spectroscopic emission at 3,092.7A for aluminum excited atoms could explain the high conversion obtained around 5,000°K when smaller propane/argon ratios are used.
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