Controlling the Structure of Arenedisulfonates toward Catalytically Active Materials

2009 ◽  
Vol 21 (4) ◽  
pp. 655-661 ◽  
Author(s):  
Felipe Gándara ◽  
Enrique Gutiérrez Puebla ◽  
Marta Iglesias ◽  
Davide M. Proserpio ◽  
Natalia Snejko ◽  
...  
Keyword(s):  
Active Materials ◽  
Catalytically Active

Synthesis of CeO2/SnO2 catalytically active materials using film-forming solution

2013 ◽  
Vol 49 (7) ◽  
pp. 681-684 ◽  
Author(s):  
O. S. Khalipova ◽  
S. A. Kuznetsova ◽  
S. I. Galanov ◽  
V. V. Kozik
Keyword(s):  
Active Materials ◽  
Film Forming ◽  
Catalytically Active

Application of Foam Glass Based on Glass Scrap and Plant Ash and Slag for the Preparation of Catalytically Active Materials

2020 ◽  
Vol 56 (7) ◽  
pp. 765-769
Author(s):  
N. P. Shabel’skaya ◽  
E. A. Yatsenko ◽  
R. P. Medvedev ◽  
B. M. Gol’tsman ◽  
E. V. Vasil’eva ◽  
...  
Keyword(s):  
Foam Glass ◽  
Active Materials ◽  
Catalytically Active ◽  
Plant Ash ◽  
Glass Scrap

scholarly journals Exploring Microemulsion-Prepared Lanthanum Catalysts for Natural Gas Valorisation

2019 ◽  
Vol 63 (4) ◽  
pp. 265-276
Author(s):  
Cristina Estruch Bosch ◽  
Stephen Poulston ◽  
Paul Collier ◽  
Joris W. Thybaut ◽  
Guy B. Marin
Keyword(s):  
Thermal Treatment ◽  
Crystallite Size ◽  
Synthesis Method ◽  
Oxidative Coupling Of Methane ◽  
X Ray Diffraction ◽  
Active Materials ◽  
Catalytically Active ◽  
Microemulsion Synthesis ◽  
Reproducible Manner

Microemulsions were used to develop a catalyst with high selectivity towards ethylene and ethane while maintaining considerable methane (CH4) conversion. The use of this technique to produce lanthanum nanoparticles was studied under different conditions. Temperature was shown to have the most significant effect on the final material properties providing a minimum crystallite size at 25°C. The morphology observed for all the samples was flake or needle like materials containing nanocrystallites. To obtain the catalytically active materials a thermal treatment was needed and this was studied using in situ X-ray diffraction (XRD). This analysis demonstrated that the materials exhibited significant changes in phase and crystallite size when submitted to thermal treatment and these were shown to be difficult to control, meaning that the microemulsion synthesis method is a challenging route to produce La nanoparticles in a reproducible manner. The materials were tested for oxidative coupling of methane (OCM) and no correlation could be observed between the ‘as synthesised’ crystallite size and activity. However, the presence of La carbonates in the materials produced was deemed to be crucial to ensure an adequate OCM activity.

scholarly journals A sustainable preparation of catalytically active and antibacterial cellulose metal nanocomposites via ball milling of cellulose

2020 ◽  
Vol 22 (2) ◽  
pp. 455-464 ◽  
Author(s):  
Joanna Kwiczak-Yiğitbaşı ◽  
Özge Laçin ◽  
Mine Demir ◽  
Recep Erdem Ahan ◽  
Urartu Özgür Şafak Şeker ◽  
...  
Keyword(s):  
Ball Milling ◽  
Reducing Agents ◽  
Active Materials ◽  
Catalytically Active ◽  
Metal Nanocomposites

Mechanochemical production of cellulose–metal NP composites requires no capping or reducing agents, and yields antibacterial and catalytically active materials.

scholarly journals Generation of catalytically active materials from a liquid metal precursor

2015 ◽  
Vol 51 (74) ◽  
pp. 14026-14029 ◽  
Author(s):  
Faegheh Hoshyargar ◽  
Husnaa Khan ◽  
Kourosh Kalantar-zadeh ◽  
Anthony P. O'Mullane
Keyword(s):  
Electron Transfer ◽  
Liquid Metal ◽  
Alkaline Solution ◽  
Potassium Ferricyanide ◽  
Transfer Reactions ◽  
Active Materials ◽  
Nitrophenol Reduction ◽  
Catalytically Active ◽  
Liquid Metal Alloy ◽  
Facile Route

A facile route to prepare catalytically active materials from a liquid metal alloy is introduced. Sonication of liquid galinstan (GaInSn) in alkaline solution or treating it with reducing agents generates In : Sn rich microspheres that are catalytically active for electron transfer reactions such as potassium ferricyanide and 4-nitrophenol reduction.

scholarly journals First Principles Approach to Extracting Chemical Information from X-Ray Absorption Near-Edge Spectra of Ga-Containing Materials

2021 ◽  
Author(s):  
Kyle Groden ◽  
FERNANDO D. VILA ◽  
Li Li ◽  
Simon Bare ◽  
Susannah Scott ◽  
...  
Keyword(s):  
First Principles ◽  
Chemical Information ◽  
Active Materials ◽  
White Line ◽  
Edge Structure ◽  
Coordination Environment ◽  
X Ray ◽  
Catalytically Active ◽  
Ligand Coordination ◽  
X Ray Absorption

The X-ray absorption near edge structure (XANES) can provide uniquely detailed information on the coordination environments of important Ga-containing materials with unknown structures, including catalytically-active materials. In this study, the Ga K-edge XANES was simulated using first principles-based methods for seven molecular Ga complexes, as well b-Ga2O3, in order to explore the chemical origins of the experimentally observed features. The theoretical spectra were computed using FEFF, CASTEP and StoBE, in order to assess the sensitivity of the results to the computational approach. While the XANES features depend on the Ga coordination environment, they are also sensitive to the electronegativity of the ligands and the symmetry at Ga. The white line position responds to changes in both the core state (due to differential screening) and the valence “p” states (arising from differences in ligand coordination).

Molecular perspective of MoS2/Co unsupported catalyst using computer assisted TEM simulations

2012 ◽  
Vol 1373 ◽  
Author(s):  
Manuel Ramos ◽  
Joseph Serrano-Matos ◽  
Eduan Martinez-Soto ◽  
Brenda Torres ◽  
Gilles Berhault ◽  
...  
Keyword(s):  
Metal Sulfides ◽  
Computer Assisted ◽  
Slice Thickness ◽  
Active Materials ◽  
Unsupported Catalyst ◽  
Transmission Modes ◽  
Catalytically Active ◽  
Field Electron Microscopy ◽  
Layered Transition Metal ◽  
Slice Method

ABSTRACTUnderstanding the morphology of catalytically active materials has been approached successfully in past decades using field electron microscopy in scanning and transmission modes. In this respect, some simulated TEM measurements for unsupported promoted molybdenum di-sulfide (MoS2/Co) provided some insights about molecular structure in those catalytic layered transition metal sulfides (LTMS). However, due to poor resolution, lack of color enhancement, and other factors, sections of those materials observed under TEM do not resolve the structure by itself; in particular about the localization of cobalt atoms for promoted MoS2 unsupported catalyst. This work concludes an epitaxial growth of MoS2 slabs over (111)-Co9S8 crystallographic plane, with a stacking degree size of 6 slabs. Results presented in here are obtained using experimental HRTEM and TEM simulations using the multi-slice method with a slice thickness of 25 Å and projected potential$f(U) = \sum\limits_{i = 1}^n {a_i e^{(- b_i U^2)} } $, where ai and bi are coefficients to be determined.

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