High-density pyridine-FeN4 active sites for acetylene hydrochlorination

Article Chemistry, Physical

Silica-supported Fe/Fe-O nanoparticles for the catalytic hydrogenation of nitriles to amines in the presence of aluminium additives

Vishwas G. Chandrashekhar et al.

Summary: Development of an iron-based catalyst for hydrogenation of nitriles, capable of promoting the conversion of various nitriles into primary amines under scalable and industrially viable conditions.

NATURE CATALYSIS (2022)

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Review Chemistry, Applied

Chitosan, chitosan nanoparticles and modified chitosan biomaterials, a potential tool to combat salinity stress in plants

Sri Renukadevi Balusamy et al.

Summary: This research review discusses the effects of chitosan, chitosan nanoparticles, and modified chitosan biomaterials on plant growth parameters, enzymes, and gene expression under salt stress. The study suggests that chitosan nanoparticles and modified chitosan biomaterials have a greater potential for improving plant function under salinity stress compared to chitosan.

CARBOHYDRATE POLYMERS (2022)

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Article Chemistry, Multidisciplinary

Sustainable Nanoporous Carbon Catalysts Derived from Melamine Assisted Cross-Linking of Poly(vinyl chloride) Waste for Acetylene Hydrochlorination

Shuhao Wei et al.

Summary: The conversion of waste plastics into high value carbon materials is crucial for sustainable development. In this study, sustainable nanoporous carbon catalysts (NPCs) with high catalytic performance were prepared by using waste poly(vinyl chloride) (PVC) as a carbon source through a solid grinding method with the assistance of melamine. The addition of melamine facilitated the dechloridation of PVC at room temperature and significantly increased the yield of carbon products. NPCs exhibited superior catalytic performance in acetylene hydrochlorination and the generated vinyl chloride (VCM) could be polymerized to produce PVC, achieving material recycling.

ACS SUSTAINABLE CHEMISTRY & ENGINEERING (2022)

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Article Chemistry, Physical

Potassium-doped carbon nitride: Highly efficient photoredox catalyst for selective oxygen reduction and arylboronic acid hydroxylation

Qingxiang Cao et al.

Summary: In this study, a potassium-doped carbon nitride photocatalyst was synthesized, which exhibited excellent photocatalytic activity and high yield of hydrogen peroxide production. It also demonstrated the oxidative effect of hydrogen peroxide in organic synthesis, opening up prospects for value-added product formation.

JOURNAL OF CATALYSIS (2022)

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Article Chemistry, Multidisciplinary

Seizing gaseous Fe2+ to densify O2-accessible Fe-N4 sites for high-performance proton exchange membrane fuel cells

Shu-Hu Yin et al.

Summary: Increasing the density of Fe-N-4 sites in Fe-N-C materials can enhance the kinetics of the oxygen reduction reaction in proton exchange membrane fuel cells. A surface-rich pyridinic-N carbon substrate has been shown to be more favorable for forming surface Fe-N2+2 sites with superior intrinsic activity. These structural advantages contribute to the high performance of Fe-g-NC/Phen in fuel cells.

ENERGY & ENVIRONMENTAL SCIENCE (2022)

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Article Chemistry, Physical

Ru supported on activated carbon and coated with a polydopamine layer for effective acetylene hydrochlorination

Miaomiao Zhang et al.

Summary: Supported ruthenium catalysts coated with polydopamine were synthesized to overcome the disadvantages of ruthenium-based catalysts. The catalysts showed highly dispersed active components and stabilized active states, promoting rapid reaction, preventing carbon deposition, and improving catalytic efficiency.

CATALYSIS SCIENCE & TECHNOLOGY (2022)

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Article Chemistry, Multidisciplinary

Efficient Amination of Activated and Non-Activated C(sp3)-H Bonds with a Simple Iron-Phenanthroline Catalyst

Lucie Jarrige et al.

Summary: A readily available catalyst consisting of iron dichloride and 1,10-phenanthroline catalyzes the ring-closing C-H amination of N-benzoyloxyurea to form imidazolidin-2-ones in high yields. The reaction is very versatile, working on various types of C-H bonds, and can be easily performed under open flask conditions.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Article Chemistry, Physical

Effects of N-, P-, or O-containing ligands on gold-based complex catalysts for acetylene hydrochlorination

Yanqin Li et al.

Summary: The study demonstrated that the interaction between ligands and gold species played a crucial role in enhancing catalytic activity, with different ligands exhibiting distinct effects in the catalytic reaction. All prepared catalysts showed improved adsorption and activation capacity of hydrogen chloride, with nitrogen-containing ligands enhancing the dispersion of gold species and phosphorus-containing ligands increasing the content of active Aun+ species. Additionally, the stability of all the prepared Au-Lx/AC catalysts was ensured by inhibiting the agglomeration of gold components or coking deposition.

APPLIED CATALYSIS A-GENERAL (2021)

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Article Chemistry, Physical

Solvent-assisted synthesis of N-doped activated carbon-based catalysts for acetylene hydrochlorination

Yawen Liu et al.

Summary: In this study, N-doped carbon-based catalysts were synthesized using a unique method and showed high activity in acetylene conversion. The excellent performance of the N-doped catalyst was mainly attributed to its unique nitrogen intercalation pathway and mesoporous structure.

APPLIED CATALYSIS A-GENERAL (2021)

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Article Engineering, Chemical

Selective and enhanced nickel adsorption from sulfate- and calcium-rich solutions using chitosan

Nina Ricci Nicomel et al.

Summary: This study investigated the use of chitosan as a sustainable technique for nickel recovery, with a focus on the complexation of sulfate with nickel to enhance chitosan's adsorption capacity. The research found that while sulfate complexation improved nickel adsorption, it also slowed down the adsorption process.

SEPARATION AND PURIFICATION TECHNOLOGY (2021)

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Article Chemistry, Physical

Enhanced catalytic performance of oxidized Ru supported on N-doped mesoporous carbon for acetylene hydrochlorination

Jiaqi Hu et al.

Summary: In this study, mesoporous carbon materials with adjustable N-doping content were synthesized and loaded with oxidized Ru species to create high-performance catalysts for acetylene hydrochlorination. Experimental results and DFT calculations revealed that N-doping inhibits coke deposition, increases the percentage of oxidized Ru species, and enhances the catalytic activity. Theoretical insights into the catalytic pathways of Ru in different valences were also provided, showing that oxidized Ru species have higher catalytic activities and revealing the molecular mechanism behind HCl activation of RuO2. These findings lay a theoretical foundation for the design and application of Ru-based catalysts in acetylene hydrochlorination.

APPLIED CATALYSIS A-GENERAL (2021)

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Article Chemistry, Physical

Densely accessible Fe-Nx active sites decorated mesoporous-carbon-spheres for oxygen reduction towards high performance aluminum-air flow batteries

Xiaogang Fu et al.

Summary: A new catalyst with single atomic iron modified nitrogen-doped carbons has been developed using a synergistic polymer-silicon dual templates strategy, resulting in dense and accessible active sites that exhibit better oxygen reduction reaction activity and stability than commercial platinum catalysts. This material shows excellent performance in an aluminum-air flow battery.

APPLIED CATALYSIS B-ENVIRONMENTAL (2021)

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Article Chemistry, Physical

Two Types of Single-Atom FeN4 and FeN5 Electrocatalytic Active Centers on N-Doped Carbon Driving High Performance of the SA-Fe-NC Oxygen Reduction Reaction Catalyst

Xiao Liang et al.

Summary: The novel SA-Fe-NC single-atom catalyst prepared via a spatial isolation strategy exhibits excellent ORR activity and stability, making it suitable for high-performance batteries based on ZAB.

CHEMISTRY OF MATERIALS (2021)

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Article Chemistry, Physical

A DFT study of graphene-FeNx (x=4, 3, 2, 1) catalysts for acetylene hydrochlorination

Xuening Zhou et al.

Summary: This paper systematically studied the mechanism and activity of graphene-FeNx series of non-noble metal catalysts for acetylene hydrochlorination using density functional theory. The results showed that the activity of the reaction decreased with a decrease in doped nitrogen atoms in the catalyst, and graphene-FeN4 exhibited excellent catalytic performance.

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS (2021)

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Article Chemistry, Physical

Single-Atom Fe-N4 sites promote the triplet-energy transfer process of g-C3N4 for the photooxidation

Junhui Wang et al.

Summary: By fabricating single-atom sites (FeN4) as triplet sensitizing sites in g-C3N4 to prepare Fe-g-C3N4, a long-lived triplet emissive state was achieved, promoting the triplet energy transfer process. However, under realistic conditions, single atoms are inevitable to sinter, which may affect the photochemical process and catalytic efficiency.

JOURNAL OF CATALYSIS (2021)

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Article Chemistry, Physical

Single-Atom Ruthenium Catalytic Sites for Acetylene Hydrochlorination

Hongyu Zhang et al.

Summary: A single-atom ruthenium catalyst was designed and prepared using a cascade anchoring strategy to maximize the efficiency of Ru atoms in acetylene hydrochlorination. Experimental results showed that the catalyst exhibited excellent activity and stability, with potential to be an important technological tool for improving the efficiency of acetylene hydrochlorination reactions in the future.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2021)

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Article Chemistry, Physical

Chemical vapour deposition of Fe-N-C oxygen reduction catalysts with full utilization of dense Fe-N4 sites

Li Jiao et al.

Summary: Replacing scarce and expensive platinum with metal-nitrogen-carbon (M-N-C) catalysts for the oxygen reduction reaction in proton exchange membrane fuel cells has been impeded by the low active site density and site utilization of M-N-C. These limitations have now been overcome by implementing trans-metalation of Zn-N-4 sites into Fe-N-4 sites.

NATURE MATERIALS (2021)

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Article Chemistry, Physical

Understanding the inter-site distance effect in single-atom catalysts for oxygen electroreduction

Zhaoyu Jin et al.

Summary: Regulating the site density of single-atom catalysts can significantly improve electrocatalysis performance, such as the oxygen reduction reaction. Strong interactions between adjacent Fe-N-4 moieties can enhance intrinsic ORR activity, with a marked improvement continuing until neighbouring Fe atoms approach as close as about 0.7 nm. Identifying the fundamental mechanism of the inter-site distance effect in Fe-N-4 catalysts may maximize the potential of densely populated SACs.

NATURE CATALYSIS (2021)

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Article Chemistry, Multidisciplinary

A pH-universal ORR catalyst with single-atom iron sites derived from a double-layer MOF for superior flexible quasi-solid-state rechargeable Zn-air batteries

Meiqi Zhao et al.

Summary: The Fe-1/d-CN catalyst demonstrates excellent ORR activity across different pH ranges, surpassing almost all reported non-noble electrocatalysts and commercial Pt/C catalyst. Its exceptional performance can be attributed to the regulation of Fe centers' electronic structure and remarkable electron/proton transport capability derived from defects and porous features. Moreover, the catalyst shows remarkable durability and performs well in quasi-solid-state Zn-air batteries, displaying high OCV and power density.

ENERGY & ENVIRONMENTAL SCIENCE (2021)

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Article Chemistry, Multidisciplinary