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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064


LEITE, Hugo Ernane Bonfim; OLIVEIRA, Alcineia Conceição  and  RANGEL, Maria do Carmo. The promoter action of zinc on catalyts for styrene synthesis. Quím. Nova [online]. 2004, vol.27, n.2, pp.247-250. ISSN 0100-4042.

Ethylbenzene dehydrogenation in the presence of steam is the main commercial route to produce styrene. The industrial catalyst is chromium and potassium-doped hematite, which easily deactivates with time due to potassium loss. In order to find non-toxic and potassium free catalysts, the promoter action of zinc on hematite was studied in this work. It was found that zinc acts as structural promoter by stabilizing the Fe3+ species (active phase) as maghemite. Although it decreases the specific surface area, it increases four times the catalytic activity as compared to hematite.

Keywords : hematite; styrene; ethylbenzene dehydrogenation.

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