Effect of vanadium contamination on H-ZSM-5 zeolite deactivation

✍ Scribed by Ricardo D.M. Pimenta; Marcelo M. Pereira; Ubirajara do Nascimento; Janaína Gorne; Eliane Bernadete; Lam Yiu Lau

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 306 KB
• Volume: 133-135
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/j.cattod.2007.12.098

✦ Synopsis

A series of H-ZSM-5 zeolite was deactivated by vanadium impregnation followed by a steaming treatment. Textural properties and total acidity measured by n-hexane cracking were determined before and after hydrothermal treatment (steaming). After vanadium impregnation, a decrease in n-hexane conversion was observed suggesting acid sites poisoning by vanadium species. Steaming treatment resulted in an additional decrease in n-hexane activity which can be probably assigned to the dealumination process that takes place during steaming. Dealumination process presented evidences of being vanadium-assisted, although the products selectivities of n-hexane cracking were not significantly affected.