Promoter effect of heteroatom substituted AlPO-11 molecular sieves in hydrocarbons cracking reaction

Yuxiang Liu, Yuchao Lyu, Baojie Wang, Yi Wang, Xinmei Liu, Mark J. Rood, Zhen Liu, Zifeng Yan

Research output: Contribution to journalArticle

Abstract

It is important to develop new promoters of fluid catalytic cracking (FCC) catalyst to increase iso-paraffin yield and avoid the decrease of research octane number (RON) caused by olefin saturation in gasoline hydrofining. SAPO-11 and LaAPO-11 molecular sieves were used as promoters to FCC catalyst to increase gasoline RON and were tested in the cracking reaction of n-dodecane on FCC conditions. LaAPO-11 molecular sieve has less and weaker acidity than SAPO-11 molecular sieve. LaAPO-11's metallic sites polarize the C–H bonds to form carbenium ions for isomerization reaction and weak acid sites make less contributions to the cracking of iso-paraffin. LaAPO-11 promoter increases the yield of iso-paraffin (C5-9) from 6.4% to 10.2%. Besides that, a high yield of arene (2.0%) is caused by the dehydrogenation activity of LaAPO-11 promoter. The new contributions of this paper are the synthesis of a hydrothermal stable LaAPO-11 molecular sieve with isomerization activity and proposing the reaction routes of iso-paraffin. These new contributions are important for developing more effective RON promoters of FCC catalyst.

Original languageEnglish (US)
Pages (from-to)330-335
Number of pages6
JournalJournal of Colloid And Interface Science
Volume528
DOIs
StatePublished - Oct 15 2018

Keywords

  • FCC
  • Isomerization
  • LaAPO-11
  • Octane number promoters
  • SAPO-11

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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