Fe-doped γ-Al<sub>2</sub>O<sub>3</sub> porous hollow microspheres for enhanced oxidative desulfurization: facile fabrication and reaction mechanism

Zhao, Wentao; Zheng, Xiaohai; Liang, Shijing; Zheng, Xiaoxiao; Shen, Lijuan; Liu, Fujian; Cao, Yanning; Wei, Zheng; Jiang, Lilong

doi:10.1039/c8gc02184h

Cited by 76 publications

(23 citation statements)

References 60 publications

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“…It was due to loading Fe, which could increase the acidity and active site of catalyst, resulting in the high catalytic efficiency of catalyst [25]. It was in agreement with previous work [26] which reported that the loading of Fe-doped γ-Al 2 O 3 catalyst exhibit enhanced catalytic activity due to higher Lewis acid sites. Denardin et al [27] also reported that the addition of Fe onto HZSM-5 zeolite could increase the total acidity and strength of the strong acid sites.…”

Section: Catalytic Hydrocracking Reaction Testsupporting

confidence: 89%

Biofuels of Green Diesel–Kerosene–Gasoline Production from Palm Oil: Effect of Palladium Cooperated with Second Metal on Hydrocracking Reaction

et al. 2020

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In this work, two kinds of catalyst called monometallic Palladium (Pd) and a bimetallic of Pd-Iron (Fe) were synthesised using aluminum oxide (Al 2 O 3 ) as the supported material via the wet impregnate method. A monometallic catalyst (0.5% Pd/Al 2 O 3 ) named Pd cat was used as control. For the bimetallic catalyst, ratios of Pd to Fe were varied, and included 0.38% Pd-0.12% Fe (PF1), 0.25% Pd-0.25% Fe (PF2), and 0.12% Pd-0.38% Fe (PF3). The catalysts were characterised to investigate physical properties such as the surface area, pore size, porosity, and pore size distribution including their composition by Brunauer-Emmett-Teller (BET) surface area, Scanning Electron Microscopy (SEM), and X-Ray Diffraction (XRD). Subsequently, all catalysts were applied for biofuels production in terms of green diesel/kerosene/gasoline from palm oil via a hydrocracking reaction. The results showed that the loading of Fe to Pd/Al 2 O 3 could improve the active surface area, porosity, and pore diameter. Considering the catalytic efficiency for the hydrocracking reaction, the highest crude biofuel yield (94.00%) was obtained in the presence of PF3 catalyst, while Pd cat provided the highest refined biofuel yield (86.00%). The largest proportion of biofuel production was green diesel (50.00-62.02%) followed by green kerosene (31.71-43.02%) and green gasoline (6.10-8.11%), respectively. It was clearly shown that the Pd-Fe bimetallic and Pd monometallic catalysts showed potential for use as chemical catalysts in hydrocracking reactions for biofuel production.

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Section: Catalytic Hydrocracking Reaction Testsupporting

confidence: 89%

Biofuels of Green Diesel–Kerosene–Gasoline Production from Palm Oil: Effect of Palladium Cooperated with Second Metal on Hydrocracking Reaction

et al. 2020

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“…As displayed in Figure 3d, the apparent activation energy (E a ) of the 4Co-N/NC is only 21.4 kJ mol −1 , significantly lower than those of pristine NC (47.1 kJ mol −1 ), 6Co-N/NC (30.7 kJ mol −1 ), 2Co-N/NC (27.4 kJ mol −1 ) and other reference catalysts in the literature. [50,51] These catalysts exhibit different catalytic performance originating from their different number of single-atom Co-N 4 active sites. The turnover frequency (TOF) of xCo-N/NC catalysts was estimated as displayed in Figure 3e.…”

Section: Resultsmentioning

confidence: 99%

Highly Poison‐Resistant Single‐Atom Co–N₄ Active Sites with Superior Operational Stability over 460 h for H₂S Catalytic Oxidation

Lei

Tong

Zheng

et al. 2021

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Efficient catalytic elimination of hydrogen sulfide (H2S) with high activity and durability in nature gas and blast‐furnace gas is very critical for both fundamental catalytic research and applied environmental chemistry. Herein, atomically dispersed Co atom catalysts with Co–N4 sites that can transform H2S into S with conversion rate of ≈100% are designed and prepared. The representative 4Co‐N/NC achieves a sulfur yield of nearly 100% and TOF(Co) of 869 h–1 at 180 °C. Importantly, remarkable long‐term durability is achieved as well, with no obvious loss of catalytic activity in the run of 460 h, outperforming most of the reported catalysts. The short bond length and strong cooperation of Co–N are beneficial to improve the structural stability of the Co–N4 centers, and significantly enhanced resistance of water and sulfation over single‐atom Co‐catalyst. The present mechanism involves the stepwise hydrogen transfer process via the adsorbed *HOO and *HS intermediates.

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“…In Figure 5b, the XRD pattern of Fe‐CN‐NPs displays clear peaks at 24.3°, 33.2°, 35.7°, 41.0°, 49.5°, 54.0°, 57.3°, and 64.0°, corresponding to ferric oxide of α‐phase (JCPDS 03–0664). [ 61 ] The HRTEM images in Figure 5c show that the average size of Fe particles supported on CN is about 10 nm. Besides, the sight of nanoparticle with lattice fringes of ≈0.25 nm suggests the (110) planes of α‐Fe 2 O 3 nanocrystal (Figure 5d).…”

Section: Resultsmentioning

confidence: 99%

Highly Active and Sulfur‐Resistant Fe–N₄ Sites in Porous Carbon Nitride for the Oxidation of H₂S into Elemental Sulfur

Lei

Tong

Liu

et al. 2020

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Iron‐based catalysts have been widely studied for the oxidation of H2S into elemental S. However, the prevention of iron sites from deactivation remains a big challenge. Herein, a facile copolymerization strategy is proposed for the construction of isolated Fe sites confined in polymeric carbon nitride (CN) (Fe‐CNNχ). The as‐prepared Fe‐CNNχ catalysts possess unique 2D structure as well as electronic property, resulting in enlarged exposure of active sites and enhancement of redox performance. Combining systematic characterizations with density functional theory calculation, it is disclosed that the isolated Fe atoms prefer to occupy four‐coordinate doping configurations (Fe–N4). Such Fe–N4 centers favor the adsorption and activation of O2 and H2S. As a consequence, Fe‐CNNχ exhibit excellent catalytic activity for the catalytic oxidation of H2S to S. More importantly, the Fe‐CNNχ catalysts are resistant to water and sulfur poisoning, exhibiting outstanding catalytic stability (over 270 h of continuous operation), better than most of the reported catalysts.

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Fe-doped γ-Al₂O₃ porous hollow microspheres for enhanced oxidative desulfurization: facile fabrication and reaction mechanism

Abstract: Fe-Doped γ-Al2O3 porous hollow microspheres with hierarchical porosity were fabricated as efficient catalysts for H2S selective oxidation.

Cited by 76 publications

References 60 publications

Biofuels of Green Diesel–Kerosene–Gasoline Production from Palm Oil: Effect of Palladium Cooperated with Second Metal on Hydrocracking Reaction

Biofuels of Green Diesel–Kerosene–Gasoline Production from Palm Oil: Effect of Palladium Cooperated with Second Metal on Hydrocracking Reaction

Highly Poison‐Resistant Single‐Atom Co–N₄ Active Sites with Superior Operational Stability over 460 h for H₂S Catalytic Oxidation

Highly Active and Sulfur‐Resistant Fe–N₄ Sites in Porous Carbon Nitride for the Oxidation of H₂S into Elemental Sulfur

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Fe-doped γ-Al2O3 porous hollow microspheres for enhanced oxidative desulfurization: facile fabrication and reaction mechanism

Abstract: Fe-Doped γ-Al2O3 porous hollow microspheres with hierarchical porosity were fabricated as efficient catalysts for H2S selective oxidation.

Cited by 76 publications

References 60 publications

Biofuels of Green Diesel–Kerosene–Gasoline Production from Palm Oil: Effect of Palladium Cooperated with Second Metal on Hydrocracking Reaction

Biofuels of Green Diesel–Kerosene–Gasoline Production from Palm Oil: Effect of Palladium Cooperated with Second Metal on Hydrocracking Reaction

Highly Poison‐Resistant Single‐Atom Co–N4 Active Sites with Superior Operational Stability over 460 h for H2S Catalytic Oxidation

Highly Active and Sulfur‐Resistant Fe–N4 Sites in Porous Carbon Nitride for the Oxidation of H2S into Elemental Sulfur

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Product

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Fe-doped γ-Al₂O₃ porous hollow microspheres for enhanced oxidative desulfurization: facile fabrication and reaction mechanism

Highly Poison‐Resistant Single‐Atom Co–N₄ Active Sites with Superior Operational Stability over 460 h for H₂S Catalytic Oxidation

Highly Active and Sulfur‐Resistant Fe–N₄ Sites in Porous Carbon Nitride for the Oxidation of H₂S into Elemental Sulfur