Yield of aromatics from naphthenics upon catalytic cracking

Journal of the Brazilian Chemical Society

Richard A. Pujro²  Marisa G. Falco²  Anne M. Garrido Pedrosa¹  Marcelo J. B. Souza¹  Edisson Morgado Jr.¹  Ulises Sedran² 

[1] ,Universidad Nacional del Litoral Consejo Nacional de Investigaciones Científicas y Técnicas Instituto de Investigaciones en Catálisis y PetroquímicaSanta Fe,Argentina

关键词: aromatics;    Y zeolite;    decalin;    cracking;    hydrogen transfer;   

DOI  :  10.1590/S0103-50532012000700023

来源: SciELO

【 摘 要 】

Cis- and trans-decalin were reacted over cracking catalysts to study the formation of aromatics in a particular fraction of the liquid products obtained in the fluid catalytic cracking process (FCC). A batch, fluidized bed CREC riser simulator reactor was used at 673 and 723 K and contact times varied from 3 to 15 s. Cis-decalin was much more reactive. Despite differences induced and measured in their accessibility indices, the catalysts led to similar activity profiles, suggesting that diffusion restrictions do not prevail. Products were C1-C12 hydrocarbons while coke was very low. Isomerization, cracking, hydrogen transfer, ring opening, ring contraction and alkylation reactions occurred and products from the various reactions were observed at very short reaction times. Bicyclic C10 naphthenics and alkyl-substituted C7-C11 aromatics or naphtheno-aromatics were the most important products. A reaction mechanism with three initial routes (isomerization, ring opening and direct hydrogen transfer reactions) was proposed.

【 授权许可】

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