Impact of pore topology and crystal thickness of nanosponge zeolites on the hydroconversion of ethylbenzene

2016 ◽  
Vol 6 (8) ◽  
pp. 2653-2662 ◽  
Author(s):  
F. Marques Mota ◽  
P. Eliášová ◽  
J. Jung ◽  
R. Ryoo
Keyword(s):  
Gas Phase ◽  
Crystal Thickness ◽  
Product Selectivity ◽  
Type Zeolite

Gas-phase hydroconversion of ethylbenzene was investigated using *MRE, MFI and MTW-type zeolite nanosponges with a hydrogenating component (Pt/Al2O3). Spacious channel interconnections in MFI was concluded to remarkably impact product selectivity compared to *MRE and MTW.

MFI-type zeolite nanosheets for gas-phase aromatics chlorination: a strategy to overcome mass transfer limitations

RSC Advances ◽  
2014 ◽  
Vol 4 (52) ◽  
pp. 27242-27249 ◽  
Author(s):  
Marilyne Boltz ◽  
Pit Losch ◽  
Benoit Louis ◽  
Guillaume Rioland ◽  
Lydie Tzanis ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Catalytic Activity ◽  
Gas Phase ◽  
Zeolite Crystal ◽  
Silanol Groups ◽  
Type Zeolite

Mass transfer limitations and catalytic activity were studied for various ZSM-5 zeolite crystal sizes in the chlorination of deactivated arenes. An estimation of the quantity of mild acidic external silanol groups of zeolite nanosheets was made.

Kinetic Experiments and Modeling of a Complex DeNOxSystem:  Decane Selective Catalytic Reduction of NOxin the Gas Phase and over an Fe-MFI Type Zeolite Catalyst

2005 ◽  
Vol 44 (13) ◽  
pp. 4523-4533 ◽  
Author(s):  
Leonid Vradman ◽  
Moti Herskowitz ◽  
Libor Čapek ◽  
Blanka Wichterlová ◽  
Roald Brosius ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Gas Phase ◽  
Zeolite Catalyst ◽  
Catalytic Reduction ◽  
Type Zeolite

Performance of zeolites and product selectivity in the gas-phase oxidation of 1,2-dichloroethane

2000 ◽  
Vol 62 (4) ◽  
pp. 367-377 ◽  
Author(s):  
R López-Fonseca ◽  
A Aranzabal ◽  
P Steltenpohl ◽  
J.I Gutiérrez-Ortiz ◽  
J.R González-Velasco
Keyword(s):  
Gas Phase ◽  
Product Selectivity ◽  
Phase Oxidation ◽  
Gas Phase Oxidation

Influence of surface acid–base properties of zirconia and titania based catalysts on the product selectivity in gas phase dehydration of glycerol

2012 ◽  
Vol 17 ◽  
pp. 23-28 ◽  
Author(s):  
Dušan Stošić ◽  
Simona Bennici ◽  
Jean-Luc Couturier ◽  
Jean-Luc Dubois ◽  
Aline Auroux
Keyword(s):  
Gas Phase ◽  
Product Selectivity ◽  
Acid Base ◽  
Base Properties

Methanol to Olefins Reaction over Cavity-type Zeolite: Cavity Controls the Critical Intermediates and Product Selectivity

ACS Catalysis ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 10950-10963 ◽  
Author(s):  
Wenna Zhang ◽  
Jingrun Chen ◽  
Shutao Xu ◽  
Yueying Chu ◽  
Yingxu Wei ◽  
...  
Keyword(s):  
Product Selectivity ◽  
Zeolite Cavity ◽  
Type Zeolite

Convergent Beam Electron Diffraction

1978 ◽  
Vol 36 (3) ◽  
pp. 304-315
Author(s):  
G. Lehmpfuhl
Keyword(s):  
Electron Diffraction ◽  
Diffraction Pattern ◽  
Crystal Surface ◽  
Diffraction Spot ◽  
Crystal Thickness ◽  
Large Area ◽  
Electron Microscopic ◽  
Additional Information ◽  
Microscopic Investigations

Introduction In electron microscopic investigations of crystalline specimens the direct observation of the electron diffraction pattern gives additional information about the specimen. The quality of this information depends on the quality of the crystals or the crystal area contributing to the diffraction pattern. By selected area diffraction in a conventional electron microscope, specimen areas as small as 1 µ in diameter can be investigated. It is well known that crystal areas of that size which must be thin enough (in the order of 1000 Å) for electron microscopic investigations are normally somewhat distorted by bending, or they are not homogeneous. Furthermore, the crystal surface is not well defined over such a large area. These are facts which cause reduction of information in the diffraction pattern. The intensity of a diffraction spot, for example, depends on the crystal thickness. If the thickness is not uniform over the investigated area, one observes an averaged intensity, so that the intensity distribution in the diffraction pattern cannot be used for an analysis unless additional information is available.

Computer Indexing of Electron Diffraction Patterns Including the Effects of Lattice Symmetry

1977 ◽  
Vol 35 ◽  
pp. 22-23
Author(s):  
J. S. Lally ◽  
R. J. Lee
Keyword(s):  
Electron Diffraction ◽  
Zone Axis ◽  
Crystal Thickness ◽  
Double Diffraction ◽  
Automated Method ◽  
Lattice Symmetry ◽  
Intensity Calculations ◽  
Unknown Structure ◽  
Diffraction Patterns ◽  
Orientation Parameters

In the 50 year period since the discovery of electron diffraction from crystals there has been much theoretical effort devoted to the calculation of diffracted intensities as a function of crystal thickness, orientation, and structure. However, in many applications of electron diffraction what is required is a simple identification of an unknown structure when some of the shape and orientation parameters required for intensity calculations are not known. In these circumstances an automated method is needed to solve diffraction patterns obtained near crystal zone axis directions that includes the effects of systematic absences of reflections due to lattice symmetry effects and additional reflections due to double diffraction processes.Two programs have been developed to enable relatively inexperienced microscopists to identify unknown crystals from diffraction patterns. Before indexing any given electron diffraction pattern, a set of possible crystal structures must be selected for comparison against the unknown.

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