Entropy driven preference for alkene adsorption at the pore mouth as the origin of pore-mouth catalysis for alkane hydroisomerization in 1D zeolites

2021 ◽  
Author(s):  
Aleksandr A. Shubin ◽  
Igor L. Zilberberg
Keyword(s):  
Theoretical Basis ◽  
Zeolite Catalysts ◽  
Skeletal Isomerization ◽  
Pore Mouth ◽  
Positional Selectivity

This work presents a theoretical basis for a pore-mouth catalysis model developed to explain the positional selectivity of skeletal isomerization on bifunctional metal acid-zeolite catalysts.

The skeletal isomerization of C4-C7 1-olefins over ferrierite and ZSM-5 zeolite catalysts

2001 ◽  
Vol 18 (1) ◽  
pp. 120-126 ◽  
Author(s):  
Wang-Gi Kim ◽  
Jong-Ho Kim ◽  
Byoung Joon Ahn ◽  
Gon Seo
Keyword(s):  
Zeolite Catalysts ◽  
Skeletal Isomerization

Skeletal Isomerization of 1-Butene on 10-Member Ring Zeolite Catalysts

1995 ◽  
Vol 151 (2) ◽  
pp. 467-469 ◽  
Author(s):  
C.L. Oyoung ◽  
R.J. Pellet ◽  
D.G. Casey ◽  
J.R. Ugolini ◽  
R.A. Sawicki
Keyword(s):  
Zeolite Catalysts ◽  
Skeletal Isomerization

External surface and pore mouth catalysis in hydrolysis of inulin over zeolites with different micropore topologies and mesoporosities

2017 ◽  
Vol 7 (5) ◽  
pp. 1153-1166 ◽  
Author(s):  
Su Cheun Oh ◽  
Thien Nguyendo ◽  
Yao He ◽  
Amanda Filie ◽  
Yiqing Wu ◽  
...  
Keyword(s):  
External Surface ◽  
Zeolite Catalysts ◽  
Inulin Hydrolysis ◽  
Pore Mouth ◽  
Hydrolysis Of

External surface and pore mouth catalysis for inulin hydrolysis over zeolite catalysts.

scholarly journals Monomolecular Skeletal Isomerization of 1-Butene over Selective Zeolite Catalysts

ACS Catalysis ◽  
2015 ◽  
Vol 5 (4) ◽  
pp. 2270-2274 ◽  
Author(s):  
Donghui Jo ◽  
Suk Bong Hong ◽  
Miguel A. Camblor
Keyword(s):  
Zeolite Catalysts ◽  
Skeletal Isomerization

Selective skeletal isomerization of n-butene over modified MCM-22 zeolite catalysts

2005 ◽  
Vol 85 (2) ◽  
pp. 245-251
Author(s):  
Yongchen Shang ◽  
Wenxiang Zhang ◽  
Mingjun Jia ◽  
Piaoping Yang ◽  
Dazhen Jiang ◽  
...  
Keyword(s):  
Zeolite Catalysts ◽  
Skeletal Isomerization

Video-Enhanced Microscopy--Better Visibility of Plant Cell Structures

1982 ◽  
Vol 40 ◽  
pp. 182-185
Author(s):  
N.S. Allen ◽  
R.D. Allen
Keyword(s):  
Diffraction Pattern ◽  
Theoretical Basis ◽  
Numerical Aperture ◽  
Gain Control ◽  
Control Unit ◽  
Camera Control ◽  
Variable Gain ◽  
Contrast Method ◽  
Fine Detail ◽  
Cell Structures

Various methods of video-enhanced microscopy combine TV cameras with light microscopes creating images with improved resolution, contrast and visibility of fine detail, which can be recorded rapidly and relatively inexpensively. The AVEC (Allen Video-enhanced Contrast) method avoids polarizing rectifiers, since the microscope is operated at retardations of λ/9- λ/4, where no anomaly is seen in the Airy diffraction pattern. The iris diaphram is opened fully to match the numerical aperture of the condenser to that of the objective. Under these conditions, no image can be realized either by eye or photographically. Yet the image becomes visible using the Hamamatsu C-1000-01 binary camera, if the camera control unit is equipped with variable gain control and an offset knob (which sets a clamp voltage of a D.C. restoration circuit). The theoretical basis for these improvements has been described.

Advances in ultramicrotomy for physical sciences applications

1993 ◽  
Vol 51 ◽  
pp. 710-711
Author(s):  
G. McMahon ◽  
T. Malis
Keyword(s):  
Particle Surface ◽  
Zeolite Catalysts ◽  
Physical Sciences ◽  
Pull Out ◽  
Large Particles ◽  
Novel Applications ◽  
Metal Wires ◽  
Frequent Problem ◽  
Specific Orientation ◽  
Diamond Knife

As with all techniques which are relatively new and therefore underutilized, diamond knife sectioning in the physical sciences continues to see both developments of the technique and novel applications.Technique Developments Development of specific orientation/embedding procedures for small pieces of awkward shape is exemplified by the work of Bradley et al on large, rather fragile particles of nuclear waste glass. At the same time, the frequent problem of pullout with large particles can be reduced by roughening of the particle surface, and a proven methodology using a commercial coupling agent developed for glasses has been utilized with good results on large zeolite catalysts. The same principle (using acid etches) should work for ceramic fibres or metal wires which may only partially pull out but result in unacceptably thick sections. Researchers from the life sciences continue to develop aspects of embedding media which may be applicable to certain cases in the physical sciences.

Severe Paradoxical Dysphonia in Two Young Women

1993 ◽  
Vol 2 (3) ◽  
pp. 52-55 ◽  
Author(s):  
Michael Collins ◽  
Robert McDonald ◽  
Robert Stanley ◽  
Timothy Donovan ◽  
C. Frank Bonebrake
Keyword(s):  
Young Women ◽  
Theoretical Basis ◽  
Therapeutic Regimen ◽  
Instrumental Data ◽  
Relationship Of ◽  
The Relationship

This report describes an unusual and persistent dysphonia in two young women who had taken a therapeutic regimen of isotretinoin for intractable acne. We report perceptual and instrumental data for their dysphonia, and pose a theoretical basis for the relationship of dysphonia to this drug. We also provide recommendations for reducing the risk of acquiring a dysphonia during the course of treatment with isotretinoin.

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