Enhanced selective adsorption desulfurization on CO2 and steam treated activated carbons: Equilibria and kinetics

Xiao

et al. 2021

Chemistry A European J

It is highly desirable to design advanced heteroatomic doped porous carbon for wide application. Herein, Ndoped porous carbon (NPC) was developed via the fabrication of high nitrogen cross-linked triazine polymers followed by pyrolysis and activation with controllable porous structure. The as-synthesized NPC at the pyrolysis temperature of 700°C possessed rich nitrogen content (up to 11.51 %) and high specific surface area (1353 m 2 g À 1 ), which led to a high CO 2 adsorption capability at 5.67 mmol g À 1 at 298.15 K and 5 bar pressure and excellent stability. When the activation temperature was at 600°C, such NPC exhibited a superior electrochemical performance as anode for supercapacitors with a specific capacitance of 158.8 and 113 F g À 1 in 6 M KOH at a current density of 1 and 10 A g À 1 , respectively. Notably, it delivered an excellent stability with capacity retention of 97.4 % at 20 A g À 1 after 6000 cycles.

Section: Resultsmentioning

confidence: 99%

“…Linear driving force (LDF) and Fick models were employed to investigate the adsorption kinetics of A‐TCLP‐700‐1 (Figure 6a) [27] . The detailed kinetics parameter is listed in Table S3.…”

Section: Resultsmentioning

confidence: 99%

N‐Doped Porous Carbon Derived from Solvent‐Free Synthesis of Cross‐Linked Triazine Polymers for Simultaneously Achieving CO₂ Capture and Supercapacitors

Xiao

et al. 2021

Chemistry A European J

“…In addition, more comparisons of other porous adsorbent for CO 2 capture are listed in Table S3 . In order to further investigate the relationship between M/P-0.1-600-2 and CO 2 , three models (i.e., Redlich–Peterson, Freundlich and Langmuir) were employed [ 37 ], as illustrated in Figure 5 b and Figure S7a,b , and the corresponding parameters are listed in Table S4 . The data of the Redlich–Peterson model presents a higher value of R 2 , implying the monolayer and multi-layer adsorption process between the M/P-0.1-600-2 and CO 2 .…”

Section: Resultsmentioning

confidence: 99%

MWCNT Decorated Rich N-Doped Porous Carbon with Tunable Porosity for CO2 Capture

et al. 2021

Designing of porous carbon system for CO2 uptake has attracted a plenty of interest due to the ever-increasing concerns about climate change and global warming. Herein, a novel N rich porous carbon is prepared by in-situ chemical oxidation polyaniline (PANI) on a surface of multi-walled carbon nanotubes (MWCNTs), and then activated with KOH. The porosity of such carbon materials can be tuned by rational introduction of MWCNTs, adjusting the amount of KOH, and controlling the pyrolysis temperature. The obtained M/P-0.1-600-2 adsorbent possesses a high surface area of 1017 m2 g−1 and a high N content of 3.11 at%. Such M/P-0.1-600-2 adsorbent delivers an enhanced CO2 capture capability of 2.63 mmol g−1 at 298.15 K and five bars, which is 14 times higher than that of pristine MWCNTs (0.18 mmol g−1). In addition, such M/P-0.1-600-2 adsorbent performs with a good stability, with almost no decay in a successive five adsorption-desorption cycles.

“…Hence, there is an ongoing effort to make alternative methods. Several technologies such as adsorption, 13 oxidation, 9,14 extraction, 14−17 and bio-desulfurization 18 have been explored. Among these methods, the oxidation process has drawn extensive attention because of various unique features, such as a cost-effective system for SAs desulfurization, no hydrogen consumption, and mild operating conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, there is an ongoing effort to make alternative methods. Several technologies such as adsorption, oxidation, , extraction, − and bio-desulfurization have been explored. Among these methods, the oxidation process has drawn extensive attention because of various unique features, such as a cost-effective system for SAs desulfurization, no hydrogen consumption, and mild operating conditions. , However, there are some studies reporting HDS at extremely (comparable to ODS) mild conditions. , A careful survey of the literature has shown that there are a few reports on the ODN process , that have not been very systematic or detailed.…”

Section: Introductionmentioning

confidence: 99%

Oxidative Desulfurization and Denitrogenation of Simulated Fuels Catalyzed by TBAPMo₁₁Cu@CuO as a High-Performance and Recoverable Heterogeneous Phase-Transfer Catalyst

2020

Aimed at catalytic oxidative desulfurization (cat-ODS) of sulfur-containing aromatic compounds (SAs) and catalytic oxidative denitrogenation (cat-ODN) of nitrogen-containing aromatic components (NAs) to control air pollution, we successfully designed and synthesized a new green catalyst (named as TBAPMo11Cu@CuO) based on quaternary ammonium salt of copperII-monosubstituted phosphomolybdate [(n-C4H9)4N][PMo11CuO39] (TBAPMo11Cu) and copper oxide (CuO) via a sol–gel method. Cat-ODS and cat-ODN processes of SAs (thiophene (Th) and dibenzothiophene (DBT)), NAs (pyridine (Py) and carbazole (CBZ)) were carried out using hydrogen peroxide green oxidant and poly(ethylene glycol) (PEG-200), which is considered as a green extractant over a TBAPMo11Cu@CuO catalyst. This new catalyst demonstrated a superb catalytic activity in the oxidation of SAs and NAs and long-term stability for producing ultraclean fuels: 97, 98, 99, and 98% values of conversion were obtained for Th, DBT, Py, and CBZ, respectively, at 35 °C. The results proved that Th and DBT were converted to the corresponding sulfoxides and sulfones, while Py and CBZ were oxidized to the corresponding N-oxides. Accordingly, the oxidized product of CBZ was identified as carbazole-9-carbaldehyde. Also, the removal of a considerable amount of Th, DBT, Py, and CBZ is possible via catalytic oxidation–extraction; however, simple solvent extraction (using methanol, ethanol, and acetonitrile) was inadequate for deep denitrogenation and desulfurization. TBAPMo11Cu@CuO as a catalyst indicated excellent reusability for five oxidation cycles. The high performance of TBAPMo11Cu@CuO/H2O2/PEG-200 can prove it as a promising green method for fuel purification.