The Varying Effects of N2, H2, CO2, and CO as Diluents in 2-Methylpentane Cracking on HY

✍ Scribed by Y.X. Zhao; B.W. Wojciechowski

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 877 KB
• Volume: 144
• Category: Article
• ISSN: 0021-9517
• DOI: 10.1006/jcat.1993.1340

✦ Synopsis

The effects of dilution by (\mathrm{N}{2}, \mathrm{H}{2}, \mathrm{CO}_{2}), and (\mathrm{CO}) on 2-methylpentane cracking over ultrastable zeolite (\mathrm{HY}) have been studied at (400^{\circ} \mathrm{C}). It was found that all these diluents slow down the rate of feed conversion, shorten the kinetic chain length, and reduce the selectivity ratios of both paraffin to olefin and isomerization to cracking. However, different diluents show different degrees of influence on these values. To explain this we propose that the various diluents "passivate" the strength of the active sites to a different degree. A quantitative description and a detailed comparison of activity and selectivity for this reaction in the presence of these various diluents are presented. C 1993 Academic Press. Inc.