Two-stage cracking catalyst of amorphous silica-alumina on Y zeolite for enhanced product selectivity and suppressed coking

Mahdi Davoodpour, Reza Tafreshi, Abbas Ali Khodadadi, Yadolla Mortazavi

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2 Citations (Scopus)

Abstract

A novel bilayer catalyst composed of amorphous silica-alumina (ASA) layer coated on Y zeolite layer is proposed as a fluid catalytic cracking (FCC) catalyst to cause two-stage reactions of pre-cracking and deep-cracking. The bilayer catalyst (Y/ASA) is compared with the usual mixed one (ASA+Y), in catalytic cracking of a feed composed of 1,3,5-triisopropylbenzene and naphthalene. The two catalyst representations were prepared by applying layers of Y zeolite and ASA or both on inert monolith supports. Catalytic cracking experiments were carried out at 300, 350 and 400 °C. Compared to Y+ASA, Y/ASA yielded about 33% and 46% more benzene and toluene, respectively, and 18% less coke in the catalytic cracking at 350 oC. The coke of Y/ASA was less refractory than that of Y+ASA as burnt at lower temperatures, while emitting less carbon monoxide in regeneration. Y/ASA configuration shows promising features as FCC catalysts for increased bottoms cracking and suppressed coking.

Original languageEnglish
Pages (from-to)681-691
Number of pages11
JournalKorean Journal of Chemical Engineering
Volume34
Issue number3
DOIs
Publication statusPublished - 1 Mar 2017
Externally publishedYes

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Keywords

  • Acid Sites
  • Coke
  • FCC
  • Preliminary Cracking
  • Silica-alumina

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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