Insight into the intraparticle diffusion of residue oil components in catalysts during hydrodesulfurization reaction

Zhigang Wang, Sheng Li Chen, Jianing Pei, Aicheng Chen, Junhui Zhang, Zhiming Xu, Jay B. Benziger

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Well-defined and uniform pore structure catalysts were used to study the intraparticle diffusion of fractionated Saudi vacuum residue under hydrodesulfurization (HDS) reaction conditions. HDS rates of residue oil cuts with different molecular weights are determined as functions of pore size, temperature, and pressure in a trickle-bed reactor. Credible intrinsic and bulk diffusivities of organosulfur compounds in residue oil were obtained for the first time, from the apparent and intrinsic reaction kinetic constants. Intrinsic diffusivities ranged from 2 × 10-7 to 8 × 10-7 cm2/s for the residual oil molecules; diffusivity decreases with increasing molecular weight of the residual oil. The intrinsic diffusivity for molecular weights ∼1000 Daltons increases with pore size for pores <70 nm, but is nearly independent of pore size for pores >70 nm. The diffusivity dependences on pore size and molecular weight suggest that the onset of restricted diffusion occurs for ratios of molecular diameter to pore diameter of ∼0.04.

Original languageEnglish (US)
Pages (from-to)3267-3275
Number of pages9
JournalAIChE Journal
Volume60
Issue number9
DOIs
StatePublished - Sep 2014

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)

Keywords

  • Diffusion
  • Hydrodesulfurization
  • Pore-size distribution

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