High performance of H3BO3 modified USY and equilibrium catalyst with tailored acid sites in catalytic cracking

Rui Feng, Xinlong Yan, Xiaoyan Hu, Ke Qiao, Zifeng Yan, Mark J. Rood

Research output: Contribution to journalArticlepeer-review

Abstract

Increasing the cracking ability of catalyst by adjusting its surface acid property is of great significance for oil refining industry. The effects of boric acid on the structure and surface acidity of ultra stabilized Y (USY) and FCC equilibrium catalyst during the modification were investigated. The structural and surface properties of the prepared samples were characterized by low-temperature N2sorption, XRD,27Al and29Si MAS NMR, and FTIR using pyridine probe molecule. Modified USY and equilibrium catalyst possessed reduced Lewis acid sites. The Brönsted/Lewis acid ratios of USY increased from 0.64 to 1.56 after modification, at the same time, the microporous surface areas increased, due to the nonframework and framework dealumination during the modification. The catalytic cracking tests were performed on a bench-scale micro reactor at 500 °C and atmospheric pressure, using n-dodecane as a modeling reactant and vacuum gas oil as conventional feedstock. The results showed that modified samples with high Brönsted acid sites had better cracking abilities and increased hydrogen transfer activity than raw samples.

Original languageEnglish (US)
Pages (from-to)319-330
Number of pages12
JournalMicroporous and Mesoporous Materials
Volume243
DOIs
StatePublished - 2017

Keywords

  • Boric acid
  • Brönsted acid
  • Catalytic cracking
  • Modification
  • Zeolite Y

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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