Thermal steam cracking of naphtha in packed bed reactors has been. Of inert and catalytic active materials on the steam cracking of naphtha. Thermal cracking eventually results in a carbonized mass called coke which resembles coal. Early thermal cracking operations like the Dubbs process required people to literally hack the coke out of the reactors. Steam helps, but no matter what, you want to make sure that the reaction doesn't go to completion. Completion is bad news. The Advanced Catalytic Olefins process. Such as straight run naphtha to high value propylene and ethylene. An alternative to steam cracking.

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Steam cracking of naphtha over six different catalysts consisting of mixtures of alumina and metal oxides, such as CaO, TiO 2, SrO, MgO, Cr 2O 3, and MnO, has been tested, and the results are compared with those for a ceramic packed bed reactor. It could be demonstrated that the catalysts used do not improve the yields of ethylene and propylene as main products. Yacc Baixaki on this page. However, the same catalysts have shown significant gasification activity, indicated by the increased yield of H 2, CO, and CO 2 with a reduction of the yields of ethylene, propylene, and other cracking products. Among those catalysts, it has been found that calcium aluminate (12CaO7Al 2O 3) selectively gasifies aromatics produced during the cracking reactions without any reduction of ethylene and propylene.