Desulfurization and Regeneration Performance of Titanium-Ore-Modified Activated Coke

Abstract

In this study, the modified activated coke (AC-Tit) was prepared from coals using titanium ore by the blending method with a one-step carbonization–activation process. The results show that the addition of titanium ore affects the physicochemical properties of AC-Tit. The AC-Tit samples have higher V mic and V mic/V tot ratios as well as oxygen and CO functional group. The metal oxides (i.e., FeTiO3, TiO2, Fe2O3, and Fe) were detected on the surface of samples, attributed to the existence of Fe and Ti in the titanium ore. The titanium ore addition improved the desulfurization performance of the AC-Tit effectively; the highest sulfur capacity was 203.3 mg/g, which was much higher than that of the blank sample (120.1 mg/g). After desulfurization, some metal sulfates, i.e., Fe2(SO4)3 and CaSO4, were detected on the AC-Tit samples. When the sample was regenerated, its surface area (S BET) and V mic did not change significantly, the relative content of CO decreased, and COOH increased evidently. In addition, metal sulfates on the AC-Tit samples were not decomposed during the regeneration process. The variation of surface chemical properties of the regenerated AC-Tit caused the reduction of the desulfurization activity after regeneration.

Facile synthesis of novel 3D flower-like magnetic La@Fe/C composites from ilmenite for efficient phosphate removal from aqueous solution

“…These results are in line with the studies showing that TiO 2 and Fe 2 O 3 can be obtained by hightemperature activation of ilmenite. 25 TiO 2 formed in the adsorbent did not undergo further structural changes, despite the extremely high reaction temperature. 26,27 The diffraction peaks of Fe 0 were not obvious except for the XRD pattern of the magnetic precursor, which could originate from the small grain size and good dispersion of Fe 0 on La 0.005 @Fe/C.…”

Model Fuel Deep Desulfurization Using Modified 3D Graphenic Adsorbents: Isotherm, Kinetic, and Thermodynamic Study

“…40,41 Metal-loaded graphene and carbon materials have also shown improved properties, especially by providing active sites for adsorption, electrochemical, and catalytic applications. 22,39,42 Various studies have introduced graphene-based materials as efficient catalysts and adsorbents for sulfur removal. 43−45 Song et al prepared graphene by different methods for desulfurization of dibenzothiophene (DBT).…”

Suitability of pyrolusite as additive to activated coke for low‐temperature NO removal

“…The impregnation modification is part of post‐processing, which is more complicated than solid blending. However, almost all of the current studies of natural mineral modified AC by blending method were focused on SO 2 removal . There is no relevant study that used this new natural mineral modified AC for low‐temperature denitrification.…”

“…15,18,19 The transition metals with catalytic activity were typically supported on AC by solution deposition and/or solid blending methods. In recent years, the solid blending method was widely researched, 20 especially low cost natural minerals as catalyst or surface modifier, 21,22 because only soluble metal salts can be used as catalyst. In addition, the preparation of modified AC by the blending method could be completed in one-step carbonization and activation.…”

“…However, almost all of the current studies of natural mineral modified AC by blending method were focused on SO 2 removal. 22,23 There is no relevant study that used this new natural mineral modified AC for low-temperature denitrification. Yang et al 24 reported that MnO x supported on Fe-Ti spinel significantly improved the NO removal activity and with high N 2 selectivity simultaneously, and the study by Qi on Fe-Mn/TiO 2 denitrification catalysts also reported high NO removal efficiency and high N 2 selectivity.…”