NO and CO Adsorption on Over-Exchanged Cu-MCM-22:  A FTIR Study

Langmuir ◽  
2002 ◽  
Vol 18 (18) ◽  
pp. 6875-6880 ◽  
Author(s):  
Alberto Frache ◽  
Marcella Cadoni ◽  
Chiara Bisio ◽  
Leonardo Marchese ◽  
Artur J. S. Mascarenhas ◽  
...  
Keyword(s):  
Co Adsorption ◽  
Ftir Study ◽  
No And Co Adsorption

scholarly journals The Properties of Cu Ions in Zeolites CuY Studied by IR Spectroscopy

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4686
Author(s):  
Jerzy Podobiński ◽  
Mariusz Gackowski ◽  
Grzegorz Mordarski ◽  
Katarzyna Samson ◽  
Michał Śliwa ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Positive Charge ◽  
Co Adsorption ◽  
The Other ◽  
Probe Molecules ◽  
Adsorption And Desorption ◽  
Other Hand ◽  
Close Proximity ◽  
No And Co Adsorption ◽  
Cu Ions

The properties of both Cu2+ and Cu+ ions in zeolite CuY were followed with NO and CO as probe molecules. Cu2+ was found to be located in SII, SII*, and SIII sites, whereas Cu+ was found in SII and SII* sites. The fine analysis of the spectra of Cu2+-NO and Cu+-CO adducts suggests that both in SII and in SII* sites two kinds of Cu cations exist. They differ in the positive charge, which may be related to the varying numbers of AlO4− in close proximity. The experiments of NO and CO adsorption and desorption evidenced that both Cu2+ and Cu+ sites of highest positive charge bind probe molecules most strongly but activate them to a lesser extent than the Cu sites of lowest positive charge. The experiments of reduction with hydrogen evidenced that the Cu ions of higher positive charge are first reduced by hydrogen. On the other hand, Cu sites of the lowest positive charge are first oxidized by oxygen. The experiments with CuNaY zeolites of various Cu contents suggest that the first introduced Cu (at low Cu contents) created Cu+, which was the most neutralized by framework oxygens. Such Cu cations are the most stabilized by framework oxygens.

FTIR Study of Low-Temperature CO Adsorption on Cu-ZSM-5: Evidence of the Formation of Cu2+(CO)2 Species

2000 ◽  
Vol 191 (2) ◽  
pp. 480-485 ◽  
Author(s):  
Konstantin Hadjiivanov ◽  
Helmut Knözinger
Keyword(s):  
Low Temperature ◽  
Co Adsorption ◽  
Ftir Study

FTIR study of the CO adsorption over Pt/MFI catalysts: Ab initio interpretation

2006 ◽  
Vol 106 (10) ◽  
pp. 2281-2289 ◽  
Author(s):  
N. S. Nesterenko ◽  
A. V. Avdey ◽  
A. Yu Ermilov
Keyword(s):  
Ab Initio ◽  
Co Adsorption ◽  
Ftir Study

FTIR Study of CO Adsorption on Ni−ZSM-5

2002 ◽  
Vol 106 (10) ◽  
pp. 2618-2624 ◽  
Author(s):  
K. Hadjiivanov ◽  
H. Knözinger ◽  
M. Mihaylov
Keyword(s):  
Co Adsorption ◽  
Ftir Study

FTIR study of low-temperature CO adsorption on Y zeolite exchanged with Be2+, Mg2+, Ca2+, Sr2+ and Ba2+ cations

2003 ◽  
Vol 58 (3) ◽  
pp. 225-236 ◽  
Author(s):  
Konstantin Hadjiivanov ◽  
Elena Ivanova ◽  
Helmut Knözinger
Keyword(s):  
Low Temperature ◽  
Co Adsorption ◽  
Y Zeolite ◽  
Ftir Study

Brnsted acidity of extraframework debris in steamed Y zeolites from the FTIR study of CO adsorption

1998 ◽  
Vol 94 (19) ◽  
pp. 3039-3047 ◽  
Author(s):  
Olivier Cairon ◽  
The´rèse Chevreau ◽  
Jean-Claude Lavalley
Keyword(s):  
Co Adsorption ◽  
Y Zeolites ◽  
Ftir Study

An infrared study of NO and CO adsorption on a silica-supported Ru catalyst

1977 ◽  
Vol 49 (3) ◽  
pp. 332-344 ◽  
Author(s):  
A DAVYDOV
Keyword(s):  
Co Adsorption ◽  
Infrared Study ◽  
Ru Catalyst ◽  
No And Co Adsorption

Brønsted acid strength in US-Y: FTIR study of CO adsorption

1994 ◽  
Vol 90 (2) ◽  
pp. 383-386 ◽  
Author(s):  
Marina A. Makarova ◽  
Khalid M. Al-Ghefaili ◽  
John Dwyer
Keyword(s):  
Co Adsorption ◽  
Acid Strength ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Ftir Study ◽  
Brönsted Acid

Calorimetric investigation of NO and CO adsorption on Pd{100} and the influence of preadsorbed carbon

1997 ◽  
Vol 106 (5) ◽  
pp. 1990-1996 ◽  
Author(s):  
Y. Y. Yeo ◽  
L. Vattuone ◽  
D. A. King
Keyword(s):  
Co Adsorption ◽  
Calorimetric Investigation ◽  
No And Co Adsorption
Sign in / Sign up

Export Citation Format

Share Document