IR study of the peculiarities of the stabilization of the NH4Na-Y zeolite structure during its hydrothermal dealumination

1993 ◽  
Vol 42 (4) ◽  
pp. 619-623 ◽  
Author(s):  
S. P. Zhdanov ◽  
L. S. Kosheleva ◽  
T. I. Titova ◽  
M. A. Shubaeva
Keyword(s):  
Y Zeolite ◽  
Zeolite Structure ◽  
Hydrothermal Dealumination ◽  
Ir Study

Cyclohexylation of Naphthalene Over USY Zeolites

1999 ◽  
Vol 64 (1) ◽  
pp. 138-148 ◽  
Author(s):  
Miroslav Michvocík ◽  
Dušan Mravec ◽  
Milan Hronec ◽  
Agáta Smiešková ◽  
Pavol Hudec
Keyword(s):  
Liquid Phase ◽  
Hydrochloric Acid ◽  
Thermal Stabilization ◽  
Y Zeolite ◽  
Zeolite Structure ◽  
Positive Effect

The influence of thermal stabilization of NH4-Y zeolite and modification of USY zeolites with solutions of hydrochloric acid on the cyclohexylation of naphthalene in the liquid phase was studied. Removal of the part of extra-framework aluminium from zeolite structure has a positive effect on both conversion of naphthalene and amount of dicyclohexylnaphthalenes formed. Modification of zeolites leads to an increase in conversion and selectivity of β-substitution in the naphthalene cyclohexylation.

Cation Location in Dehydrated Na−Rb−Y Zeolite:  An XRD and IR Study

1997 ◽  
Vol 101 (50) ◽  
pp. 10653-10660 ◽  
Author(s):  
G. L. Marra ◽  
A. N. Fitch ◽  
A. Zecchina ◽  
G. Ricchiardi ◽  
M. Salvalaggio ◽  
...  
Keyword(s):  
Y Zeolite ◽  
Ir Study

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

Study on the Formation of Mesopore during Hydrothermal Dealumination of Y Zeolite

2002 ◽  
Vol 18 (03) ◽  
pp. 201-206
Author(s):  
Dong Song-Tao ◽  
◽  
◽  
Li Xuan-Wen ◽  
Li Da-Dong ◽  
...  
Keyword(s):  
Y Zeolite ◽  
Hydrothermal Dealumination

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.

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