Hyper-Cross-Linked Porous Porphyrin Aluminum(III) Tetracarbonylcobaltate as a Highly Active Heterogeneous Bimetallic Catalyst for the Ring-Expansion Carbonylation of Epoxides

2019 ◽  
Vol 11 (20) ◽  
pp. 18609-18616 ◽  
Author(s):  
Vinothkumar Ganesan ◽  
Sungho Yoon
Keyword(s):  
Bimetallic Catalyst ◽  
Ring Expansion ◽  
Highly Active

scholarly journals Mesoporous bimetallic Fe/Co as highly active heterogeneous Fenton catalyst for the degradation of tetracycline hydrochlorides

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Junchao Li ◽  
Xuhua Li ◽  
Jindong Han ◽  
Fansheng Meng ◽  
Jinyuan Jiang ◽  
...  
Keyword(s):  
Bimetallic Catalyst ◽  
Removal Rate ◽  
Catalytic Efficiency ◽  
Nitrogen Adsorption ◽  
Catalytic Performance ◽  
Operating Parameters ◽  
Co Catalyst ◽  
Highly Active ◽  
Fenton Catalyst ◽  
Potential Applications

Abstract Mesoporous bimetallic Fe/Co was prepared as a Fenton-like catalyst to degrade the tetracycline hydrochlorides (TC). The nanocasting strategy with KIT-6 as a hard template was carried out to synthesize the mesoporous bimetallic catalyst. The mesoporous bimetallic Fe/Co catalyst was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen adsorption-desorption isotherms, and Brunauer-Emmett-Teller (BET) method. The results showed that the catalyst has significant nanofeatures; the surface area, pore size, and particle size were 113.8 m2g−1, 4 nm, and 10 nm, respectively. In addition, the effects of the operating parameters, such as the iron-to-cobalt ratio, pH, H2O2, and initial TC concentrations on its catalytic performance were investigated. The best operating parameters were as follows: iron-to-cobalt ratio = 2:1 to 1:1, pH = 5–9, H2O2: 30 mmol, initial TC less than 30 mg/L. Furthermore, the mesoporous bimetallic Fe/Co showed a good performance for degrading TC, achieving a removal rate of 86% of TC after 3 h under the reaction conditions of H2O2 = 30 mmol, mesoporous bimetallic Fe/Co = 0.6 g/L, TC = 30 mg/L, pH = 7.0, and temperature = 25.5 °C. The mesoporous bimetallic Fe/Co catalyst shows good stability and reusability. This work demonstrated that mesoporous bimetallic Fe/Co has excellent catalytic efficiency, smaller amounts of leached ions, and wider pH range, which enhance its potential applications.

scholarly journals Leveraging the interplay between homogeneous and heterogeneous catalytic mechanisms: copper-iron nanoparticles working under chemically relevant tumor conditions

2021 ◽  
Author(s):  
Javier Bonet-Aleta ◽  
Miguel Encinas ◽  
Esteban Urriolabeitia ◽  
Pilar Martin-Duque ◽  
Jose L Hueso ◽  
...  
Keyword(s):  
Cell Death ◽  
Bimetallic Catalyst ◽  
Catalytic Cycle ◽  
Superoxide Anions ◽  
Tumor Cell Death ◽  
Tumor Microenvironments ◽  
Heterogeneous Catalytic ◽  
Highly Active ◽  
Heterogeneous Processes ◽  
Chemical Conditions

The present work sheds light on a generally overlooked issue in the emerging field of bio-orthogonal catalysis within tumor microenvironments (TMEs): the interplay between homogeneous and heterogeneous catalytic processes. In most cases, previous works dealing with nanoparticle-based catalysis in the TME, focus on the effects obtained (e.g. tumor cell death) and attribute the results to heterogeneous processes alone. The specific mechanisms are rarely substantiated and, furthermore, the possibility of a significant contribution of homogeneous processes by leached species –and the complexes that they may form with biomolecules- is neither contemplated nor pursued. Herein, we have designed a bimetallic catalyst nanoparticle containing Cu and Fe species and we have been able to describe the whole picture in a more complex scenario where both homogeneous and heterogeneous processes are coupled and fostered under TME relevant chemical conditions. We investigate the preferential leaching of Cu ions in the presence of a TME overexpressed biomolecule such as glutathione (GSH). We demonstrate that these homogeneous processes initiated by the released by Cu-GSH interactions are in fact responsible for the greater part of the cell death effects found (GSH, a scavenger of reactive oxygen species is depleted and highly active superoxide anions are generated in the same catalytic cycle). The remaining solid CuFe nanoparticle becomes an active catalase-mimicking surrogate able to supply oxygen from oxygen reduced species, such as superoxide anions (by-product from GSH oxidation) and hydrogen peroxide, another species that is enriched in the TME. This enzyme-like activity is essential to sustain the homogeneous catalytic cycle in the oxygen-deprived tumor microenvironment. The combined heterogeneous-homogeneous mechanisms revealed themselves as highly efficient in selectively killing cancer cells, due to their higher GSH levels compared to healthy cell lines.

A Highly Active Pd on Ni–B Bimetallic Catalyst for Liquid-Phase Hydrodechlorination of 4-Chlorophenol Under Mild Conditions

2011 ◽  
Vol 141 (6) ◽  
pp. 792-798 ◽  
Author(s):  
Chongxia Sun ◽  
Zhijie Wu ◽  
Yuzhen Mao ◽  
Xiaoqian Yin ◽  
Liyuan Ma ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Bimetallic Catalyst ◽  
Mild Conditions ◽  
Highly Active

scholarly journals A covalent triazine framework-based heterogenized Al–Co bimetallic catalyst for the ring-expansion carbonylation of epoxide to β-lactone

RSC Advances ◽  
2017 ◽  
Vol 7 (8) ◽  
pp. 4635-4638 ◽  
Author(s):  
Senkuttuvan Rajendiran ◽  
Prakash Natarajan ◽  
Sungho Yoon
Keyword(s):  
Propylene Oxide ◽  
High Selectivity ◽  
Bimetallic Catalyst ◽  
Ring Expansion ◽  
Heterogenized Catalyst ◽  
Covalent Triazine Framework

The recyclable and heterogenized catalyst [bpy-CTF-AI(OTf)2][Co(CO)4] (bpy = bipyridine) efficiently converts propylene oxide into β-butyrolactone with high selectivity.

Highly active PdCu/graphene catalyst for an efficient Suzuki cross-coupling reaction

2020 ◽  
Vol 44 (47) ◽  
pp. 20525-20529
Author(s):  
Xiaojing M. ◽  
Lingfeng Gao ◽  
Zhentao Weng ◽  
Hua Yang ◽  
Xu Sun
Keyword(s):  
Bimetallic Catalyst ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Solvothermal Reaction ◽  
One Pot ◽  
Highly Active ◽  
Cross Coupling Reaction ◽  
Supported Pd

A graphene supported Pd–Cu bimetallic catalyst (Pd–Cu/G) has been successfully fabricated by a simple one-pot solvothermal reaction.

Structure and composition of metal particles in Pt-Sn/Al2O3 bimetallic catalysts

1990 ◽  
Vol 48 (4) ◽  
pp. 278-279
Author(s):  
A. Sachdev ◽  
J. Schwank
Keyword(s):  
Bimetallic Catalysts ◽  
Bimetallic Catalyst ◽  
Size Structure ◽  
High Surface ◽  
High Surface Area ◽  
Metal Particles ◽  
Alloy Formation ◽  
Particle Size Range ◽  
Oxide Supports ◽  
Petroleum Fractions

Platinum - tin bimetallic catalysts have been primarily utilized in the chemical industry in the catalytic reforming of petroleum fractions. In this process the naphtha feedstock is converted to hydrocarbons with higher octane numbers and high anti-knock qualities. Most of these catalysts contain small metal particles or crystallites supported on high surface area insulating oxide supports. The determination of the structure and composition of these particles is crucial to the understanding of the catalytic behavior. In a bimetallic catalyst it is important to know how the two metals are distributed within the particle size range and in what way the addition of a second metal affects the size, structure and composition of the metal particles. An added complication in the Pt-Sn system is the possibility of alloy formation between the two elements for all atomic ratios.

Elemental Distribution in Pt-Re:Al2O3 Naphtha Reforming Catalysts

1980 ◽  
Vol 38 ◽  
pp. 200-201
Author(s):  
R. L. Freed ◽  
M. J. Kelley
Keyword(s):  
Bimetallic Catalyst ◽  
Supported Catalysts ◽  
Coke Formation ◽  
Materials Characterization ◽  
Metal Catalyst ◽  
Elemental Distribution ◽  
Exact Nature ◽  
Naphtha Reforming ◽  
Reforming Catalysts ◽  
Commercial Introduction

The commercial introduction of Pt-Re supported catalysts to replace Pt alone on Al2O3 has brought improvements to naphtha reforming. The bimetallic catalyst can be operated continuously under conditions which lead to deactivation of the single metal catalyst by coke formation. Much disagreement still exists as to the exact nature of the bimetallic catalyst at a microscopic level and how it functions in the process so successfully. The overall purpose of this study was to develop the materials characterization tools necessary to study supported catalysts. Specifically with the Pt-Re:Al2O3 catalyst, we sought to elucidate the elemental distribution on the catalyst.

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