期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 642, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2022.128597
关键词
Deep desulfurization; Fuels; Dibenzothiophene (DBT) adsorption; Activated porous carbon; Oxidation of carbon BAX
资金
- European Regional Development Fund of the European Union
- Greek National Funds through the Operational Program Competitiveness, Entrepreneurship and Innovation [T2EAK-01976]
The efficiency of deep desulfurization for commercial activated porous carbon and its chemically modified counterparts was evaluated through dynamic and batch experiments. The oxidation process affected the carbon's physicochemical features, resulting in controversial effects on desulfurization efficiency. The oxidized carbon showed slightly negative performance in column tests but positive performance in batch tests.
The efficiency for deep desulfurization (removal of dibenzothiophene, DBT) of a benchmark commercial activated porous carbon (BAX) and its chemically modified counterparts was evaluated both by dynamic (fixed-bed column) and batch experiments. Oxidation of BAX led to alteration of various key physicochemical features, namely textural parameters and surface chemistry heterogeneity. These alterations affected controversially the desulfurization efficiency/capacity, since the effect was positive for batch tests but slightly negative for column tests. The oxidized sample BAX-O4 was the only one capable to decrease the initial concentration of sulfur from 20 to less than 10 ppmwS at the batch experiments. In case of the dynamic tests, even though a slightly faster exhaustion was observed for the oxidized samples, the adsorption kinetics were faster. It was also shown that oxidation of BAX resulted in denser column packing. Thus, a higher amount of adsorbent material per unit volume (bed density) can be achieved which will lead to increment of the column's desulfurization efficiency. Analysis of the breakthrough data by curve modeling showed that carbon-beds operated smoothly under equilibrium conditions. By detailed analysis and comparisons of the physicochemical features of the initial and exhausted samples as well as considering the fitting of the adsorption results at various kinetic models, it was
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