Air‐promoted adsorptive desulfurization of diesel fuel over Ti‐Ce mixed metal oxides
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. © 2014 American Institute of Chemical Engineers AIChE J, 61: 631–639, 2015
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 18, 2014
- Source ID
- 10.1002/aic.14647
Entities
People
- Chunshan Song
- Jing Xiao
- Mamoru Fujii
- Michael Janik
- Shingo Watanabe
- Siddarth Sitamraju
- Yongsheng Chen
Organizations
- National Energy Technology Laboratory
- National Natural Science Foundation of China
- Office of Naval Research
- Pennsylvania State University
- PetroChina Innovation Foundation
- United States Department of Energy