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Ultra-deep catalytic adsorptive desulfurization of diesel fuel using Ti-silica gel adsorbent at low Ti-loading
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  • Lei Dong,
  • Xiong Dai,
  • Chong Peng,
  • Cuiting Yang,
  • Shibin Chen,
  • Guang Miao,
  • Zhong Li,
  • Jing Xiao
Lei Dong
South China University of Technology School of Chemistry and Chemical Engineering
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Xiong Dai
South China University of Technology
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Chong Peng
East China University of Science and Technology
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Cuiting Yang
South China University of Technology
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Shibin Chen
South China University of Technology
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Guang Miao
South China University of Technology School of Chemistry and Chemical Engineering
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Zhong Li
South China University of Technology
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Jing Xiao
South China University of Technology
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Abstract

In this work, the effective ultra-deep catalytic adsorptive desulfurization (CADS) using Ti-silica gel adsorbent at low Ti loading range (< 1%) was investigated. The superior CADS capacity (37.3 mg-S/g-A) and high TOF value (432 h-1) for dibenzothiophene (DBT) were achieved at 0.6% of Ti loading with high dispersion and low Ti coordination. The catalytic oxidation of DBT conformed to the pseudo-first-order kinetic model, and the corresponding rate equation was well described as , where the TiOOR is determined as the intermediate to enable the DBT oxidation to the corresponding sulfone (DBTO2). The effectiveness of CADS using Ti-SG was verified in various real low-sulfur diesels with varied sulfur concentrations and O/S ratios in the dynamic fixed-bed adsorption and multi-cycle regenerations. This work provides insights on using low-cost bifunctional catalytic adsorbents at low Ti loading for effective CADS to realize ultra-deep desulfurization of transportation fuels.

Peer review status:UNDER REVIEW

22 Apr 2021Submitted to AIChE Journal
23 Apr 2021Assigned to Editor
23 Apr 2021Submission Checks Completed
06 May 2021Reviewer(s) Assigned