Hydroxyl groups on hydrogen Y zeolite

1969 ◽  
Vol 73 (6) ◽  
pp. 2086-2088 ◽  
Author(s):  
John William Ward
Keyword(s):  
Hydroxyl Groups ◽  
Y Zeolite

FT-IR study of the interaction of oxygen, argon, helium, nitrogen and xenon with hydroxyl groups in H-Y zeolite at low temperatures

1997 ◽  
Vol 8 (1-2) ◽  
pp. 29-37 ◽  
Author(s):  
Fumitaka Wakabayashi ◽  
Junko N. Kondo ◽  
Kazunari Domen ◽  
Chiaki Hirose
Keyword(s):  
Low Temperatures ◽  
Hydroxyl Groups ◽  
Y Zeolite ◽  
Ft Ir ◽  
Ir Study

scholarly journals Study of sulfur dioxide adsorption on Y zeolite

2004 ◽  
Vol 69 (7) ◽  
pp. 563-569 ◽  
Author(s):  
Ioan-Cezar Marcu ◽  
I. Sdjndulescu
Keyword(s):  
Sulfur Dioxide ◽  
Lewis Acidity ◽  
Hydroxyl Groups ◽  
Y Zeolite ◽  
High Adsorption ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Type Zeolite ◽  
Adsorption Desorption ◽  
Adsorptive Properties

Sulfur dioxide adsorptive properties of Y zeolite, the structure of which was confirmed by XRD, were investigated at temperatures within the 25?200 ?C range and sulfur dioxide concentrations between 0.9 to 6%(vol./vol). It was found that this sorbent possesses a relatively high adsorption capacity. The Y zeolite did not lose its activity during 20 adsorption desorption-regeneration cycles. The manner in which sulfur dioxide is adsorbed on Y type zeolite was also investigated by analyzing the sample with and without adsorbed SO2, using IR spectroscopy, as well as total and Lewis acidity measurements. The sulfur dioxide molecule is probably adsorbed by hydrogen bonding to one or two conveniently positioned surface hydroxyl groups.

Proton Exchange Reaction between Hydroxyl Groups in the Supercage and Those in the Sodalitecage of Y Zeolite As Studied by Variable Temperature1H MAS NMR

2012 ◽  
Vol 116 (33) ◽  
pp. 17734-17738 ◽  
Author(s):  
Naoki Asakawa ◽  
Ken Motokura ◽  
Tatsuaki Yashima ◽  
To-ru Koyama ◽  
Toshinori O-nuki ◽  
...  
Keyword(s):  
Exchange Reaction ◽  
Proton Exchange ◽  
Mas Nmr ◽  
Hydroxyl Groups ◽  
Y Zeolite

The location of hydroxyl groups in hydrogen Y zeolite

1967 ◽  
Vol 71 (9) ◽  
pp. 3106-3106 ◽  
Author(s):  
John William Ward
Keyword(s):  
Hydroxyl Groups ◽  
Y Zeolite

An analytical microscopic study of metals in fluidized catalytic cracking catalyst

1986 ◽  
Vol 44 ◽  
pp. 854-855
Author(s):  
Clifford S. Rainey
Keyword(s):  
Electron Microscopy ◽  
Spatial Distribution ◽  
Catalytic Cracking ◽  
Catalyst Deactivation ◽  
Coke Formation ◽  
Acid Sites ◽  
Y Zeolite ◽  
Fcc Catalyst ◽  
Fluidized Catalytic Cracking ◽  
High Regeneration

The spatial distribution of V and Ni deposited within fluidized catalytic cracking (FCC) catalyst is studied because these metals contribute to catalyst deactivation. Y zeolite in FCC microspheres are high SiO2 aluminosilicates with molecular-sized channels that contain a mixture of lanthanoids. They must withstand high regeneration temperatures and retain acid sites needed for cracking of hydrocarbons, a process essential for efficient gasoline production. Zeolite in combination with V to form vanadates, or less diffusion in the channels due to coke formation, may deactivate catalyst. Other factors such as metal "skins", microsphere sintering, and attrition may also be involved. SEM of FCC fracture surfaces, AEM of Y zeolite, and electron microscopy of this work are developed to better understand and minimize catalyst deactivation.

Bleaching ability of pre-hydrolyzed pulps in the context of a biorefinery mill

TAPPI Journal ◽  
2013 ◽  
Vol 12 (11) ◽  
pp. 49-53 ◽  
Author(s):  
CHRISTINE CHIRAT ◽  
LUCIE BOIRON ◽  
DOMINIQUE LACHENAL
Keyword(s):  
Carbon Content ◽  
Acid Hydrolysis ◽  
13C Nmr ◽  
Kraft Lignin ◽  
Kappa Number ◽  
Hydroxyl Groups ◽  
Kraft Pulps ◽  
Quaternary Carbon ◽  
Oxygen Delignification

Autohydrolysis and acid hydrolysis treatments were applied on mixed softwood chips. The cooking ability was studied by varying the alkali and duration of the cook. Pulps with kappa numbers varying from 30 to 70 were obtained. The bleaching ability of these pulps was studied and compared to control kraft pulps. The prehydrolyzed pulps were shown to be more efficiently delignified by oxygen than the control kraft pulps starting from the same kappa number. Furthermore, the final bleaching was also easier for these pulps. It was also shown that extensive oxygen delignification applied on high-kappa pre-hydrolyzed pulps could be a way to improve the overall yield, which is a prerequisite for the development of such biorefinery concepts. Lignin was isolated from the control kraft and the two pre-hydrolyzed kraft pulps and analyzed by 13C NMR. Lignins from pre-hydrolyzed kraft pulps had similar free phenolic groups content to the control kraft lignin, but their aliphatic hydroxyl groups and β-O-4 content were lower than for the control lignin. The quaternary carbon content was the same for all the samples.

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