Catalysis, whether homogeneous or heterogeneous, is found everywhere: in biological systems, in the food and pharmaceutical processes, in the petroleum and petrochemical industry, in atmospheric pollution control. Depending on the catalyst employed different products can be synthesized from the same starting material. For example, propylene can be converted to high octane gasoline, metathesized to ethylene and 2-butene or polymerized to a widely used polypropylene plastic.
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Christos P. Tsonis (1984) studied this question.