Influence of Gallium Isomorphous Substitution in the Acidic MFI Zeolite Framework on Hole Formation, Transfer, and Trapping upon Incorporation of Anthracene

2011 ◽  
Vol 115 (14) ◽  
pp. 6635-6643 ◽  
Author(s):  
Alain Moissette ◽  
Raul F. Lobo ◽  
Hervé Vezin ◽  
Claude Brémard
Keyword(s):  
Isomorphous Substitution ◽  
Hole Formation ◽  
Mfi Zeolite ◽  
Zeolite Framework

Precise control of density and strength of acid sites of MFI-type zeolite nanoparticles via simultaneous isomorphous substitution by Al and Fe

CrystEngComm ◽  
2020 ◽  
Vol 22 (44) ◽  
pp. 7556-7564
Author(s):  
Mizuho Yabushita ◽  
Hiroki Kobayashi ◽  
Atsushi Neya ◽  
Masafumi Nakaya ◽  
Sachiko Maki ◽  
...  
Keyword(s):  
Acid Sites ◽  
Linear Control ◽  
Isomorphous Substitution ◽  
Zeolite Framework ◽  
Precise Control ◽  
Type Zeolite ◽  
Catalyst Lifetime

The co-incorporation of Al and Fe at various relative ratios into the MFI-type zeolite framework enabled linear control of the density and strength of acid sites, and such well-tuned acidity led to a better catalyst lifetime.

scholarly journals XPS characterization of a synthetic Ti-containing MFI zeolite framework: the titanosilicalites, TS-1

2008 ◽  
Vol 40 (3-4) ◽  
pp. 695-699 ◽  
Author(s):  
Fausto Langerame ◽  
Anna Maria Salvi ◽  
Marcello Silletti ◽  
Giuliano Moretti
Keyword(s):  
Mfi Zeolite ◽  
Zeolite Framework ◽  
Xps Characterization

Study of Argon Gas Adsorption in Ordered Mesoporous MFI Zeolite Framework

2012 ◽  
Vol 116 (48) ◽  
pp. 25300-25308 ◽  
Author(s):  
Hae Sung Cho ◽  
Keiichi Miyasaka ◽  
Hyungjun Kim ◽  
Yoshiki Kubota ◽  
Masaki Takata ◽  
...  
Keyword(s):  
Gas Adsorption ◽  
Mfi Zeolite ◽  
Zeolite Framework ◽  
Argon Gas ◽  
Ordered Mesoporous

Effects of single and double active sites of Cu oxide clusters over MFI zeolite for direct conversion of methane to methanol: DFT calculations

2021 ◽  
Author(s):  
Watinee Nunthakitgoson ◽  
Anawat Thivasasith ◽  
Thana Maihom ◽  
Chularat Wattanakit
Keyword(s):  
Dft Calculations ◽  
Active Sites ◽  
Direct Conversion ◽  
Mfi Zeolite ◽  
Zeolite Framework ◽  
Conversion Of Methane

In this context, we investigate the effect of the single and double active sites of Cu oxide clusters over the MFI zeolite framework for direct conversion of methane to methanol....

Molecular Mechanics Studies on MFI Type Zeolites. 2. Isomorphous Substitution by Aluminium

1992 ◽  
Vol 57 (4) ◽  
pp. 681-686 ◽  
Author(s):  
Erik de Vos Burchart ◽  
Herman van Bekkum ◽  
Bastiaan van de Graaf
Keyword(s):  
Force Field ◽  
Molecular Mechanics ◽  
Mirror Symmetry ◽  
Organic Molecules ◽  
Unit Cell ◽  
Isomorphous Substitution ◽  
Zeolite Framework ◽  
Mm3 Force Field ◽  
Framework Energy

The molecular mechanics force field developed for all-silica structures is extended with parameters for tetrahedral aluminium. With this force field and the MM3 force field for organic molecules the effects of isomorphous substitution in the MFI framework are examined (4 Al/unit cell) with tetrapropyl ammonium (TPA) as the charge compensating cation. The results indicate a slight preference for the positions 2, 9, 5, 12, and 6 and the by mirror symmetry related positions. The differences in energy are mainly due to the differences in the zeolite framework energy.

Unraveling the Effect of Silanol Defects on the Insertion of Single-Site Mo in the MFI Zeolite Framework

2022 ◽  
Author(s):  
Izabel C. Medeiros-Costa ◽  
Eddy Dib ◽  
Florent Dubray ◽  
Simona Moldovan ◽  
Jean-Pierre Gilson ◽  
...  
Keyword(s):  
Single Site ◽  
Mfi Zeolite ◽  
Zeolite Framework

Isomorphous substitution of Al, Fe, B, and Ge into MFI-zeolite membranes

2000 ◽  
Vol 41 (1-3) ◽  
pp. 269-280 ◽  
Author(s):  
Vu A Tuan ◽  
John L Falconer ◽  
Richard D Noble
Keyword(s):  
Isomorphous Substitution ◽  
Mfi Zeolite ◽  
Zeolite Membranes

Isomorphous replacement in electron diffraction of wet crystals of rat hemoglobin

1983 ◽  
Vol 41 ◽  
pp. 446-447
Author(s):  
William F. Tivol ◽  
Murray Vernon King ◽  
D. F. Parsons
Keyword(s):  
Electron Diffraction ◽  
Heavy Atom ◽  
Isomorphous Substitution ◽  
X Ray Diffraction ◽  
Salt Solutions ◽  
X Ray ◽  
Isomorphous Replacement ◽  
Structure Factors ◽  
Diffraction Structure ◽  
The Mean

Feasibility of isomorphous substitution in electron diffraction is supported by a calculation of the mean alteration of the electron-diffraction structure factors for hemoglobin crystals caused by substituting two mercury atoms per molecule, following Green, Ingram & Perutz, but with allowance for the proportionality of f to Z3/4 for electron diffraction. This yields a mean net change in F of 12.5%, as contrasted with 22.8% for x-ray diffraction.Use of the hydration chamber in electron diffraction opens prospects for examining many proteins that yield only very thin crystals not suitable for x-ray diffraction. Examination in the wet state avoids treatments that could cause translocation of the heavy-atom labels or distortion of the crystal. Combined with low-fluence techniques, it enables study of the protein in a state as close to native as possible.We have undertaken a study of crystals of rat hemoglobin by electron diffraction in the wet state. Rat hemoglobin offers a certain advantage for hydration-chamber work over other hemoglobins in that it can be crystallized from distilled water instead of salt solutions.

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