scholarly journals Highly Dispersed Sn-beta Zeolites as Active Catalysts for Baeyer–Villiger Oxidation: The Role of Mobile, In Situ Sn(II)O Species in Solid-State Stannation

ACS Catalysis ◽  
2021 ◽  
pp. 5984-5998
Author(s):  
Elise Peeters ◽  
Guillaume Pomalaza ◽  
Ibrahim Khalil ◽  
Arnaud Detaille ◽  
Damien P. Debecker ◽  
...  
Keyword(s):  
Solid State ◽  
Beta Zeolites ◽  
Highly Dispersed ◽  
Villiger Oxidation

Hydrogen Desorption Reactions of the Na-Mg-B-H System

2010 ◽  
Vol 72 ◽  
pp. 164-169 ◽  
Author(s):  
Daphiny Pottmaier ◽  
Sebastiano Garroni ◽  
Maria Dolors Barò ◽  
Marcello Baricco
Keyword(s):  
Solid State ◽  
Research And Development ◽  
Ball Milling ◽  
Powder Diffraction ◽  
Hydrogen Desorption ◽  
X Ray ◽  
New Compounds ◽  
Desorption Reaction

Hydrogen storage in the solid state has shown increasing research and development, and recently an approach in mixing two hydride systems together by ball milling (reactive hydride composites) has been investigated in more detail, e.g. NaBH4 plus MgH2. Thermodynamic destabilization may occur by new compounds formation during dehydrogenation, e.g. MgB2. A study of the the role of O2/H2O contamination for the reaction 2NaBH4 + MgH2 ↔ 2NaH + MgB2 + 4H2 was conducted using in-situ X-ray powder diffraction. Desorption reaction is observed to begin by a competition of MgH2 and NaBH4 decomposition due to higher reactivity promoted by ball milling processing summed to O2/H2O contamination. Oxidation of NaBH4 into NaBO2 is observed to happen in higher degree than MgH2/Mg into MgO for the Na-Mg-B-H system.

Real-time plasmon spectroscopy study of the solid-state oxidation and Kirkendall void formation in copper nanoparticles

Nanoscale ◽  
2017 ◽  
Vol 9 (34) ◽  
pp. 12573-12589 ◽  
Author(s):  
Mariano D. Susman ◽  
Yishai Feldman ◽  
Tatyana A. Bendikov ◽  
Alexander Vaskevich ◽  
Israel Rubinstein
Keyword(s):  
Solid State ◽  
Real Time ◽  
Copper Nanoparticles ◽  
Void Formation ◽  
Kirkendall Effect ◽  
Kirkendall Void ◽  
Spectroscopy Study ◽  
Cu Nanoparticle

In situ LSPR measurements establish the role of the nano Kirkendall effect in Cu nanoparticle oxidation.

Role of Al3+ species in beta zeolites for Baeyer–Villiger oxidation of cyclic ketones by using H2O2 as an environmentally friendly oxidant

2018 ◽  
Vol 307 ◽  
pp. 293-300 ◽  
Author(s):  
Keita Taniya ◽  
Ryota Mori ◽  
Atsushi Okemoto ◽  
Takafumi Horie ◽  
Yuichi Ichihashi ◽  
...  
Keyword(s):  
Environmentally Friendly ◽  
Cyclic Ketones ◽  
Beta Zeolites ◽  
Villiger Oxidation

In situ FTIR spectroscopy of highly dispersed FeOx catalysts for NO reduction: Role of Na promoter

2016 ◽  
Vol 267 ◽  
pp. 56-64 ◽  
Author(s):  
Charles A. Roberts ◽  
Louisa Savereide ◽  
David J. Childers ◽  
Torin C. Peck ◽  
Justin M. Notestein
Keyword(s):  
Ftir Spectroscopy ◽  
No Reduction ◽  
In Situ Ftir ◽  
In Situ Ftir Spectroscopy ◽  
Highly Dispersed ◽  
Catalysts For No Reduction

The Nature of Chemisorbed CO2 in Zeolite A

2019 ◽  
Author(s):  
Przemyslaw Rzepka ◽  
Zoltán Bacsik ◽  
Andrew J. Pell ◽  
Niklas Hedin ◽  
Aleksander Jaworski
Keyword(s):  
Solid State ◽  
Ir Spectroscopy ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Surface Coverage ◽  
Gas Mixtures ◽  
Mas Nmr ◽  
Significant Fraction ◽  
Zeolite A

Formation of CO<sub>3</sub><sup>2-</sup> and HCO<sub>3</sub><sup>-</sup> species without participation of the framework oxygen atoms upon chemisorption of CO<sub>2</sub> in zeolite |Na<sub>12</sub>|-A is revealed. The transfer of O and H atoms is very likely to have proceeded via the involvement of residual H<sub>2</sub>O or acid groups. A combined study by solid-state <sup>13</sup>C MAS NMR, quantum chemical calculations, and <i>in situ</i> IR spectroscopy showed that the chemisorption mainly occurred by the formation of HCO<sub>3</sub><sup>-</sup>. However, at a low surface coverage of physisorbed and acidic CO<sub>2</sub>, a significant fraction of the HCO<sub>3</sub><sup>-</sup> was deprotonated and transformed into CO<sub>3</sub><sup>2-</sup>. We expect that similar chemisorption of CO<sub>2</sub> would occur for low-silica zeolites and other basic silicates of interest for the capture of CO<sub>2</sub> from gas mixtures.

{10-12} Twinning Mechanism During In Situ Micro-Tensile Loading of Pure Mg: Role of Basal Slip and Twin-Twin Boundary Interaction

2020 ◽  
Author(s):  
Nicolò Maria della Ventura ◽  
Szilvia Kalácska ◽  
Daniele Casari ◽  
Thomas Edward James Edwards ◽  
Johann Michler ◽  
...  
Keyword(s):  
Twin Boundary ◽  
Basal Slip ◽  
Tensile Loading ◽  
Boundary Interaction
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