Advances in Resources Recovery of H₂S: A Review of Desulfurization Processes and Catalysts

ACS Catalysis, Journal Year: 2023, Volume and Issue: 13(17), P. 11723 - 11752

Published: Aug. 21, 2023

Hydrogen sulfide (H2S) is a notorious and lethal gas widely generated in human economic activities natural occurrences. The growing demand for pollution control makes it vital the development of efficient processes to remove convert H2S into high-valued products. As such, diversified technologies have been extensively explored, including splitting, selective oxidation H2S, simultaneous conversion CO2. In this review, state-of-the-art utilization are reviewed. potentials various value-added products from utilization, such as H2, syngas, COS, CH3SH, other sulfur-containing fine chemicals elucidated detail. Notably, traditional emerging materials removal, mainly metal oxide catalysts carbon-based also overviewed review. addition, catalytic mechanisms these desulfurization reactions briefly discussed. Lastly, perspectives given on viability technological gaps each technology corresponding catalysts.

Language: Английский

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Innovative sono-synthesis of cerium dioxide nanomaterials using mentha extract with efficient activity for cancer therapy application

Results in Engineering, Journal Year: 2024, Volume and Issue: 23, P. 102720 - 102720

Published: Aug. 10, 2024

Nanostructured CeO2 was fabricated through a facile sonochemical route utilizing cerium (III) nitrate hexahydrate as metal source and mentha extract novel capping agent. To our knowledge, this experimental work is the first successful endeavor for fabricating nanostructured employing by an easy eco-friendly route. The microstructure various characteristics of oxide nanostructure prepared were investigated using methods. This research examined anticancer effects green synthesized nanoparticles (CeO2-NPs) on cancer cell lines (T98 SHSY5Y) at several concentrations 0.0, 0.05, 0.1, 0.2, 0.4, 0.8 mg/ml NPs exposure time 24/48 h. obtained results presented cytotoxicity against cancerous lines. Considering CeO2-NP's cells indicated significant toxicity lines, these could be applied in medicine developing new drug formulations Additional investigations are desired to reveal other biological applications normal

Language: Английский

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Research Progress on Preparation of Metal Oxide Catalysts with Porous Structure and Their Catalytic Purification of Diesel Engine Exhausts Gases

ACS Catalysis, Journal Year: 2024, Volume and Issue: 14(8), P. 6062 - 6127

Published: April 8, 2024

Because of their special physicochemical properties, pore-structured metal oxide catalysts are widely used in environmental catalysis, energy chemicals, fuel cells, medicine, and other related fields. In recent years, these oxides have also been increasingly studied the catalytic purification diesel engine exhaust gases. this paper, research progresses preparation methods porous application were reviewed. The advantages disadvantages different for synthesis elaborated, as well mechanism comparison types pollutants. Finally, current issues on development trends summarized discussed. beneficial improving contact efficiency between pollutants, which can enhance catalysts. Meanwhile, intrinsic activity is most fundamental factor determining except structure effects. addition, paper help researchers to deeply understand important effect treatment pollutants provide theoretical guidance design high-efficiency

Language: Английский

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Recent advances in core-shell structured catalysts for low-temperature NH3-SCR of NOx

Chemosphere, Journal Year: 2023, Volume and Issue: 333, P. 138942 - 138942

Published: May 15, 2023

Language: Английский

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Enhancement of photocatalytic activity of CeO2 nanorods through lanthanum doping (La–CeO2) for the degradation of Congo red dyes

Results in Engineering, Journal Year: 2024, Volume and Issue: 23, P. 102748 - 102748

Published: Aug. 16, 2024

The discharge of synthetic dyes into water bodies poses severe environmental risks due to their toxic and recalcitrant nature. This study explores the enhancement photocatalytic properties cerium dioxide (CeO2) nanorods by doping with lanthanum (La) improve efficacy in degrading aqueous solutions Congo red dye. CeO2 were synthesized via a hydrothermal method subsequently doped varying concentrations La. scanning electron microscopy (SEM) images confirmed rod-like structures (nanorods) observed for all samples, while energy-dispersive X-ray spectroscopy (EDX) homogeneous incorporation La matrix. diffraction (XRD) spectra demonstrate lattice distortion substitutional defect. Photocatalytic experiments revealed that La-doped exhibited significantly enhanced degradation capabilities compared undoped counterparts, achieving up 3-fold kinetics ((30 ± 2) × 10−3 min−1) counterparts ((11.5 0.4) min−1). Influence various parameters affect photocatalysis performance (i.e., contact time, initial dye concentration, catalyst dosage, solution pH value) also investigated. Radical scavenger reveal superoxide radicals play dominant role process. Collectively, these findings confirm strategic not only enhances overall efficiency but tailors activity towards specific pollutants through radical-mediated pathways.

Language: Английский

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Analysis of CeO2-Supported Ru Catalysts for an Efficient Catalytic Wet Air Oxidation of Reconstituted Tobacco Wastewater

Catalysts, Journal Year: 2025, Volume and Issue: 15(2), P. 109 - 109

Published: Jan. 23, 2025

CeO2-supported noble metal catalysts show great application potential in the catalytic oxidation of volatile organic compounds and hazardous wastewater. In this paper, an efficient Ru/CeO2 catalyst is developed by combining oxygen affinity metals redox supports for wet air (CWAO) reconstituted tobacco First, what factors affect performance are studied investigating effect (C, TiO2, Al2O3, CeO2) (Pt, Pd, Ru) on activity. Second, further enhanced tuning morphology CeO2 supports. The results indicate that Ru/CeO2-R (rod-like) highly active can reach a high TOC conversion 97.6% at 220 °C 1 h. contrast, conversions Ru/CeO2-MOF, Ru/CeO2-NP (nanoparticle), Ru/CeO2-C (cube-like) 93.3, 77.9, 68.2%, respectively. also presented good stability. be maintained approximately 85% four consecutive cycles. characterization better Ru dispersion, higher Ce3+ content, more surface reactive species, electron transfer between CeO2-R, from CeO2-R to main reasons best catalyst.

Language: Английский

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Research progress on preparation of cerium-based oxide catalysts with specific morphology and their application for purification of diesel engine exhaust

Journal of Rare Earths, Journal Year: 2023, Volume and Issue: 42(7), P. 1187 - 1216

Published: Dec. 9, 2023

Language: Английский

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Synergistic effect in ternary CeO2-ZrO2-MnOx catalysts for CO oxidation and soot combustion

Chemical Engineering Science, Journal Year: 2023, Volume and Issue: 285, P. 119593 - 119593

Published: Dec. 5, 2023

Language: Английский

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Efficient visible-light photooxidation of ciprofloxacin antibiotic over CoTiO3-impregnated 2D CeO2 nanocomposites synthesized by a sol-gel-based process

Materials Science in Semiconductor Processing, Journal Year: 2023, Volume and Issue: 162, P. 107487 - 107487

Published: April 7, 2023

Language: Английский

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Ce–Zr–Mn Oxide Catalysts for Soot Combustion: The Role of Preparation Method

The Journal of Physical Chemistry C, Journal Year: 2024, Volume and Issue: 128(32), P. 13432 - 13444

Published: Aug. 5, 2024

In catalysis science and technology, the catalytic performance of materials is strongly dependent on preparation method used. The catalysts with similar composition can show significantly different performance, while causing factors remain debated. Here, we effect methods soot combustion ternary MnOx–CeO2–ZrO2 prepared by a citric acid-assisted solvothermal approach utilizing propionic acid. both series catalysts, Tmax changes in row: CeO2–MnOx < CeO2 CeO2–ZrO2–MnOx CeO2–ZrO2, catalyst components, regardless their form distribution within sample, feature synergistic effects reaction. A notable decrease temperature observed for all samples as compared to citrate series, which caused enhanced interphase air-catalyst-soot interaction, resulting formation an interfacial structure "Mn–O–Mn–O–Ce" type, generation oxygen vacancies, reoxidation active oxide species at MnOx/CexZr1–xO2 interfaces.

Language: Английский

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