Ultra-deep catalytic adsorptive desulfurization of diesel fuel using Ti-silica gel adsorbent at low Ti-loading

摘要

In this work, the effective ultra-deep catalytic adsorptive desulfurization (CADS) using titanium-silica gel (Ti-SG) adsorbent at low Ti loading (<1 wt.%) was investigated. The superior CADS capacity (37.3 mg-S/g-A) and high TOF value (432 h(-1)) for dibenzothiophene (DBT) of Ti-SG adsorbent were achieved at Ti loading of 0.6% with high dispersion and low titanium coordination. The rate equation of catalytic DBT oxidation was described as rDBT=N2kKCHPDBT, where the TiOOR was determined as the intermediate to enable the DBT oxidation to form the corresponding sulfone (DBTO2). The effectiveness of CADS using Ti-SG adsorbents was verified in real diesels with varied sulfur concentrations and O/S ratios in the dynamic adsorption and multicycle regeneration. This work provides insights on using low-cost bifunctional catalytic adsorbents at low Ti loadings for effective CADS to realize ultra-deep desulfurization of transportation fuels.

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