Two Manganese Metalloporphyrin Frameworks Constructed from a Custom-Designed Porphyrin Ligand Exhibiting Selective Uptake of CO2 over CH4 and Catalytic Activity for CO2 Fixation

2021 ◽  
Author(s):  
Zachary L. Magnuson ◽  
Qigan Cheng ◽  
Weijie Zhang ◽  
Yu-Sheng Chen ◽  
Lukasz Wojtas ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Co2 Fixation ◽  
Selective Uptake ◽  
Porphyrin Ligand

scholarly journals Coupled inter-subunit dynamics enable the fastest CO2-fixation by reductive carboxylases

2019 ◽  
Author(s):  
Hasan DeMirci ◽  
Yash Rao ◽  
Gabriele M. Stoffel ◽  
Bastian Vögeli ◽  
Kristina Schell ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Molecular Mechanisms ◽  
Co2 Fixation ◽  
Catalytic Domains ◽  
Catalytically Active ◽  
Key Enzyme ◽  
Order Of Magnitude ◽  
Conformational Coupling ◽  
Substrate Binding Sites ◽  
Half Site

AbstractEnoyl-CoA carboxylases/reductases (ECRs) are the most efficient CO2-fixing enzymes described to date, outcompeting RubisCO, the key enzyme in photosynthesis in catalytic activity by more than an order of magnitude. However, the molecular mechanisms underlying ECR’s extraordinary catalytic activity remain elusive. Here we used different crystallographic approaches, including ambient temperature X-ray Free Electron Laser (XFEL) experiments, to study the dynamic structural organization of the ECR from Kitasatospora setae. K. setae ECR is a homotetramer that differentiates into a dimer of dimers of open- and closed-form subunits in the catalytically active state, suggesting that the enzyme operates with “half-site reactivity” to achieve high catalytic rates. Using structure-based mutagenesis, we show that catalysis is synchronized in K. setae ECR across the pair of dimers by conformational coupling of catalytic domains and within individual dimers by shared substrate binding sites. Our results provide unprecedented insights into the dynamic organization and synchronized inter- and intra-subunit communications of nature’s most efficient CO2-fixing enzyme during catalysis.

An efficient CO2 fixation reaction with epoxides catalysed by in situ formed blue vanadium catalyst from dioxovanadium(+5) complex: moisture enhanced and atmospheric oxygen retarded catalytic activity

2020 ◽  
Vol 44 (6) ◽  
pp. 2547-2554 ◽  
Author(s):  
Rakhimoni Borah ◽  
Naranarayan Deori ◽  
Sanfaori Brahma
Keyword(s):  
Carbon Dioxide ◽  
Catalytic Activity ◽  
Co2 Fixation ◽  
Atmospheric Oxygen ◽  
Carbon Dioxide Fixation ◽  
Vanadium Catalyst ◽  
Cyclic Carbonates ◽  
Mild Conditions ◽  
Fixation Reaction

In situ formed vanadium(+4) species catalyzed carbon dioxide fixation reaction, leading to 99% conversion of epoxides to cyclic carbonates under mild conditions is reported here, along with the study on the in situ formed catalyst to some extent.

New lanthanide(iii) coordination polymers: synthesis, structural features, and catalytic activity in CO2 fixation

2017 ◽  
Vol 46 (47) ◽  
pp. 16426-16431 ◽  
Author(s):  
Cong Xu ◽  
Yan Liu ◽  
Li Wang ◽  
Jingxin Ma ◽  
Lizi Yang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Coordination Polymers ◽  
Co2 Fixation ◽  
Structural Features ◽  
Cycloaddition Reactions ◽  
Heterogeneous Catalytic

A series of Ln-CPs show highly heterogeneous catalytic activity for cycloaddition reactions with TON = 3920 and TOF = 326 h−1.

Porous noria polymer: a cage-to-network approach toward a robust catalyst for CO2 fixation and nitroarene reduction

2021 ◽  
Author(s):  
Arkaprabha Giri ◽  
Niraj Nitish Patil ◽  
Abhijit Patra
Keyword(s):  
Catalytic Activity ◽  
Co2 Fixation ◽  
Organic Polymers ◽  
Network Approach ◽  
Porous Organic Polymers ◽  
Nitroarene Reduction

A ‘preporous’ waterwheel-like molecular cage, noria, was knitted with rigid aromatic linkers to obtain porous organic polymers exhibiting excellent catalytic activity toward CO2 fixation and nitroarene reduction.

A Novel and Green In Situ Strategy for the Synthesis of Metallophthalocyanines on Chitosan and Investigation Their Catalytic Activity in the CO2 Fixation

2019 ◽  
Vol 149 (8) ◽  
pp. 2089-2097 ◽  
Author(s):  
Mahmoud Borjian Boroujeni ◽  
Mohammad Sadegh Laeini ◽  
Mohammad Taghi Nazeri ◽  
Ahmad Shaabani
Keyword(s):  
Catalytic Activity ◽  
Co2 Fixation

High resolution electron microscopy of lanthanum phosphate crystals

1978 ◽  
Vol 36 (1) ◽  
pp. 274-275
Author(s):  
J. C. Wheatley ◽  
J. M. Cowley
Keyword(s):  
Electron Microscopy ◽  
Catalytic Activity ◽  
High Resolution ◽  
Petroleum Industry ◽  
High Resolution Electron Microscopy ◽  
Lanthanum Phosphate ◽  
Good Catalyst ◽  
Resolution Electron ◽  
Good Catalytic Activity ◽  
Physical And Chemical

Rare-earth phosphates are of particular interest because of their catalytic properties associated with the hydrolysis of many aromatic chlorides in the petroleum industry. Lanthanum phosphates (LaPO4) which have been doped with small amounts of copper have shown increased catalytic activity (1). However the physical and chemical characteristics of the samples leading to good catalytic activity are not known.Many catalysts are amorphous and thus do not easily lend themselves to methods of investigation which would include electron microscopy. However, the LaPO4, crystals are quite suitable samples for high resolution techniques.The samples used were obtained from William L. Kehl of Gulf Research and Development Company. The electron microscopy was carried out on a JEOL JEM-100B which had been modified for high resolution microscopy (2). Standard high resolution techniques were employed. Three different sample types were observed: 669A-1-5-7 (poor catalyst), H-L-2 (good catalyst) and 27-011 (good catalyst).

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