Air-promoted adsorptive desulfurization of diesel fuel over Ti-Ce mixed metal oxides

Jing Xiao, Siddarth Sitamraju, Yongsheng Chen, Shingo Watanabe, Mamoru Fujii, Michael John Janik, Chunshan Song

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

Air-promoted adsorptive desulfurization (ADS) of commercial diesel fuel over a Ti-Ce mixed oxide adsorbent in a flow system is investigated in this work. The fresh/spent adsorbents were characterized using X-ray absorption near edge structure spectroscopy. Results show that sulfoxide species are formed during air-promoted ADS over Ti0.9Ce0.1O2 adsorbent. Adsorption selectivity of various compounds in fuel follows the order of dibenzothiophene sulfone>dibenzothiophene ≃ benzothiophene>4-methyldibenzothiophene> 4,6-dimethyldibenzothiophene>phenanthrene>methylnaphthalene>fluorene>naphthalene. The high adsorption affinity of sulfoxide/sulfone is attributed to stronger Ti-OSR2 than Ti-SR2 interactions, resulting in significantly enhanced ADS capacity. Adsorption affinity was calculated using ab initio methods. For Ti-Ce mixed oxides, reduced surface sites lead to O-vacancy sites for O2 activation for oxidizing thiophenic species. Low temperature is preferred for air-promoted ADS, and the Ti-Ce adsorbent can be regenerated via oxidative air treatment. This study paves a new path of designing regenerable adsorbents.

Original languageEnglish (US)
Pages (from-to)631-639
Number of pages9
JournalAICHE Journal
Volume61
Issue number2
DOIs
Publication statusPublished - Jan 1 2015

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All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)

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