Catalytic consequences of micropore topology, mesoporosity, and acidity on the hydrolysis of sucrose over zeolite catalysts

2014 ◽  
Vol 4 (9) ◽  
pp. 3064 ◽  
Author(s):  
Yao He ◽  
Thomas C. Hoff ◽  
Laleh Emdadi ◽  
Yiqing Wu ◽  
Judicael Bouraima ◽  
...  
Keyword(s):  
Zeolite Catalysts ◽  
Hydrolysis Of

Catalytic hydrolysis of HCN on ZSM-5 modified by Fe or Nb for HCN removal: surface species and performance

RSC Advances ◽  
2016 ◽  
Vol 6 (112) ◽  
pp. 111389-111397 ◽  
Author(s):  
Zhongxian Song ◽  
Qiulin Zhang ◽  
Ping Ning ◽  
Yu Wang ◽  
Yankang Duan ◽  
...  
Keyword(s):  
Zeolite Catalysts ◽  
Catalytic Hydrolysis ◽  
Surface Species ◽  
And Performance ◽  
Hydrolysis Of

Interactions present between Fe and Nb species resulted in larger amounts of isolated Fe3+, Nb5+, oligomeric FexOy and NbxOy clusters on zeolite catalysts, resulting in improved HCN hydrolysis.

scholarly journals Hydrolysis of cellulose to glucose by supercritical water and silver mesoporous zeolite catalysts

Cellulose ◽  
2019 ◽  
Vol 26 (4) ◽  
pp. 2471-2485 ◽  
Author(s):  
S. G. Aspromonte ◽  
A. Romero ◽  
A. V. Boix ◽  
E. Alonso
Keyword(s):  
Supercritical Water ◽  
Zeolite Catalysts ◽  
Mesoporous Zeolite ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of

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.

Fine Structural Localization of Acyltransferases Involved in Lipid Synthesis in Intestinal Mucosa.

1970 ◽  
Vol 28 ◽  
pp. 54-55
Author(s):  
R. J. Barrnett ◽  
J. A. Higgins
Keyword(s):  
Smooth Endoplasmic Reticulum ◽  
Lipid Synthesis ◽  
Mucosal Cell ◽  
Structural Localization ◽  
Morphological Studies ◽  
Mucosal Cells ◽  
Initial Appearance ◽  
Sh Group ◽  
Hydrolysis Of ◽  
Intestinal Mucosal Cells

The main products of intestinal hydrolysis of dietary triglycerides are free fatty acids and monoglycerides. These form micelles from which the lipids are absorbed across the mucosal cell brush border. Biochemical studies have indicated that intestinal mucosal cells possess a triglyceride synthesising system, which uses monoglyceride directly as an acylacceptor as well as the system found in other tissues in which alphaglycerophosphate is the acylacceptor. The former pathway is used preferentially for the resynthesis of triglyceride from absorbed lipid, while the latter is used mainly for phospholipid synthesis. Both lipids are incorporated into chylomicrons. Morphological studies have shown that during fat absorption there is an initial appearance of fat droplets within the cisternae of the smooth endoplasmic reticulum and that these subsequently accumulate in the golgi elements from which they are released at the lateral borders of the cell as chylomicrons.We have recently developed several methods for the fine structural localization of acyltransferases dependent on the precipitation, in an electron dense form, of CoA released during the transfer of the acyl group to an acceptor, and have now applied these methods to a study of the fine structural localization of the enzymes involved in chylomicron lipid biosynthesis. These methods are based on the reduction of ferricyanide ions by the free SH group of CoA.

Lattice imaging and pore structure of β ferric oxyhydroxide

1978 ◽  
Vol 36 (1) ◽  
pp. 264-265
Author(s):  
T. Baird ◽  
J.R. Fryer ◽  
S.T. Galbraith
Keyword(s):  
Electron Microscopy ◽  
Room Temperature ◽  
Bulk Material ◽  
Model Structure ◽  
Bulk Crystals ◽  
Lattice Imaging ◽  
Thin Sections ◽  
Ferric Oxyhydroxide ◽  
Resolution Electron ◽  
Hydrolysis Of

Introduction Previously we had suggested (l) that the striations observed in the pod shaped crystals of β FeOOH were an artefact of imaging in the electron microscope. Contrary to this adsorption measurements on bulk material had indicated the presence of some porosity and Gallagher (2) had proposed a model structure - based on the hollandite structure - showing the hollandite rods forming the sides of 30Å pores running the length of the crystal. Low resolution electron microscopy by Watson (3) on sectioned crystals embedded in methylmethacrylate had tended to support the existence of such pores.We have applied modern high resolution techniques to the bulk crystals and thin sections of them without confirming these earlier postulatesExperimental β FeOOH was prepared by room temperature hydrolysis of 0.01M solutions of FeCl3.6H2O, The precipitate was washed, dried in air, and embedded in Scandiplast resin. The sections were out on an LKB III Ultramicrotome to a thickness of about 500Å.

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.

Sign in / Sign up

Export Citation Format

Share Document