An Efficient Catalyst System at Mild Reaction Conditions Containing Rare Earth Metal Complexes

Wang, Wenzhen; Wu, Yang; Duan, Yan‐Shan; Zhang, Jun‐Tao; Yang, Penghui; Ni, Bing‐Hu; Wu, Yangjie

doi:10.1002/jccs.201300081

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…However, experimental results only manifest a minimal quantity of Ce‐containing inclusions, with the exact classification remaining inconclusive. This is consistent with findings observed by Yang et al, [ 27 ] where the cerium content of less than 0.0015% led to negligible rare earth inclusions in the steel. CeAlO 3 and Ce 2 O 2 S inclusions are stable phases, and the amount of Ce‐Al‐O surpasses Ce 2 O 2 S in the C75 sample.…”

Section: Discussionsupporting

confidence: 93%

Effects of Cerium Content on the Nonmetallic Inclusions and Impact Toughness of Transformation‐Induced Plasticity Steel

Wang,

Zhu,

Chen

et al. 2024

steel research int.

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The effects of Ce treatment on the inclusion evolution and impact toughness of as‐cast transformation‐induced plasticity (TRIP) steel are systematically investigated by scanning electron microscope (SEM) and impact toughness testing. The results reveal that in Fe‐2Mn‐1.5Al‐1Si‐0.2C steel without Ce, the primary inclusions consist of AlN, MnS, and Al2O3. After Ce addition, the inclusions evolve into Ce‐Al‐O, Ce2O2S, CeS, and Ce2O3 inclusions. The evolution of inclusions exhibits an initial reduction in both quantity and size with increasing Ce content, followed by a subsequent increase. In cases of excessive Ce content, there is an observable rise in the overall inclusion count, marked by the emergence of CeAs, CeP, and CeC2 inclusions. The segregation model suggests that P‐containing inclusions predominantly precipitate in the late solidification process, while As‐ and C‐containing inclusions form during the solid phase. When the Ce content reaches 0.0075 wt%, the minimum values of the number density and average diameter are 96.7 mm−2 and 1.6 μm, respectively. Furthermore, the influence of the size, morphology, quantity, and type of inclusions on the impact toughness are analyzed. The highest recorded impact energy is 6.8 J with a Ce content of 0.0075 wt%.

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Section: Discussionsupporting

confidence: 93%

Effects of Cerium Content on the Nonmetallic Inclusions and Impact Toughness of Transformation‐Induced Plasticity Steel

Wang,

Zhu,

Chen

et al. 2024

steel research int.

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“…The detailed catalytic procedure was described in our previous work [45]. A 100 mL stainless-steel reactor was charged with purified propylene oxide (PO) and catalyst.…”

Section: Methodsmentioning

confidence: 99%

New Coordination Complexes Based on the 2,6-bis[1-(Phenylimino)ethyl] Pyridine Ligand: Effective Catalysts for the Synthesis of Propylene Carbonates from Carbon Dioxide and Epoxides

Wang

Liu

et al. 2018

Molecules

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We aimed to develop new effective catalysts for the synthesis of propylene carbonate from propylene oxide and carbon dioxide. A kind of Mx+LClx coordination complex was fabricated based on the chelating tridentate ligand 2,6-bis[1-(phenylimino)ethyl] pyridine (L). The obtained products were characterized by elemental analysis, infrared spectroscopy, ultraviolet spectroscopy, thermogravimetric analysis, and single-crystal X-ray diffraction. It was found that the catalytic activity of the complexes with different metal ions, the same ligand differed and co-catalyst, where the order of greatest to least catalytic activity was 2 > 3 > 1. The catalytic system composed of complex 2 and DMAP proved to have the better catalytic performance. The yields for complex 2 systems was 86.7% under the reaction conditions of 100 °C, 2.5 MPa, and 4 h. The TOF was 1026 h−1 under the reaction conditions of 200 °C, 2.5 MPa, and 1 h. We also explored the influence of time, pressure, temperature, and reaction substrate concentration on the catalytic reactions. A hypothetical catalytic reaction mechanism is proposed based on density functional theory (DFT) calculations and the catalytic reaction results.

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“…They also require co-solvents to achieve excellent activity (Ghosh et al, 2010). Up to now, reports on rare earth complex catalysts on the cycloaddition of carbon dioxide to propylene oxide for the synthesis of PC remain extremely scarce, and the catalytic function of heterocyclic amine ligand complexes for this series has been rarely explored (Wang et al, 2013). Considering that rare earth metal ions have high charges, high coordination numbers and incompact room compared to common transition metal ions, it is our interest to investigate the novel and efficient rare earth metal catalyst system for synthesizing PC under relatively mild reaction conditions (Lin & Luo, 2006).…”

Section: Introductionmentioning

confidence: 99%

Rare Earth Complex Catalysts Transforming CO2 into Cyclic Carbonate under Mild Conditions

Wang¹,

Zhao²,

Jia³

et al. 2015

AJS

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A highly efficient catalyst system was designed and fabricated based on the synthesis of cyclic carbonates from CO 2 and propylene oxide. The reaction of carbon dioxide with propylene oxide that generates propylene carbonate (PC) when catalyzed by N-heterocyclic ligands (Bipy, Hdpa, Hdpza and Napy) and rare earth metal salts system was investigated. Also, the influence of the ligand structure for catalytic performance was analyzed. Different reaction conditions including temperature, pressure and reducing metal were studied to optimize reaction conditions.

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An Efficient Catalyst System at Mild Reaction Conditions Containing Rare Earth Metal Complexes

Cited by 5 publications

References 24 publications

Effects of Cerium Content on the Nonmetallic Inclusions and Impact Toughness of Transformation‐Induced Plasticity Steel

Effects of Cerium Content on the Nonmetallic Inclusions and Impact Toughness of Transformation‐Induced Plasticity Steel

New Coordination Complexes Based on the 2,6-bis[1-(Phenylimino)ethyl] Pyridine Ligand: Effective Catalysts for the Synthesis of Propylene Carbonates from Carbon Dioxide and Epoxides

Rare Earth Complex Catalysts Transforming CO2 into Cyclic Carbonate under Mild Conditions

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