High-Pressure CO Adsorption on Cu-Based Catalysts: Zn-Induced Formation of Strongly Bound CO Monitored by ATR-IR Spectroscopy

Langmuir ◽  
2011 ◽  
Vol 27 (8) ◽  
pp. 4728-4733 ◽  
Author(s):  
Zhimin Liu ◽  
André Rittermeier ◽  
Michael Becker ◽  
Kevin Kähler ◽  
Elke Löffler ◽  
...  
Keyword(s):  
High Pressure ◽  
Ir Spectroscopy ◽  
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.

scholarly journals High-pressure synthesis of REB5O8(OH)2 (RE = Ho, Er, Tm)

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Michael Zoller ◽  
Hubert Huppertz
Keyword(s):  
High Pressure ◽  
Rare Earth ◽  
Ir Spectroscopy ◽  
Earth Metal ◽  
Monoclinic Space Group ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure Solution ◽  
Pressure Synthesis ◽  
The Rare Earth

AbstractThe rare earth oxoborates REB5O8(OH)2 (RE = Ho, Er, Tm) were synthesized in a Walker-type multianvil apparatus at a pressure of 2.5 GPa and a temperature of 673 K. Single-crystal X-ray diffraction data provided the basis for the structure solution and refinement. The compounds crystallize in the monoclinic space group C2 (no. 5) and are composed of a layer-like structure containing dreier and sechser rings of corner sharing [BO4]5− tetrahedra. The rare earth metal cations are coordinated between two adjacent sechser rings. Further characterization was performed utilizing IR spectroscopy.

CO adsorption on Pd(111) and Pd(100): Low and high pressure correlations

1993 ◽  
Vol 11 (4) ◽  
pp. 1969-1974 ◽  
Author(s):  
János Szanyi ◽  
W. Kevin Kuhn ◽  
D. Wayne Goodman
Keyword(s):  
High Pressure ◽  
Co Adsorption

The effect of high external pressure on the structure and stability of MOF α-Mg3(HCOO)6 probed by in situ Raman and FT-IR spectroscopy

2015 ◽  
Vol 3 (22) ◽  
pp. 11976-11984 ◽  
Author(s):  
Haiyan Mao ◽  
Jun Xu ◽  
Yue Hu ◽  
Yining Huang ◽  
Yang Song
Keyword(s):  
High Pressure ◽  
Ir Spectroscopy ◽  
Vibrational Spectroscopy ◽  
External Pressure ◽  
Structural Transitions ◽  
In Situ Raman ◽  
Ft Ir ◽  
High Pressure Study ◽  
Ft Ir Spectroscopy

A first high-pressure study on MOF α-Mg3(HCOO)6 probed by in situ vibrational spectroscopy revealed strongly contrasting host-dependent structural transitions and stabilities.

Dimerization of Carboxylic Acids in Solution up to High Pressures and Temperatures. 1. Pivalic Acid

1987 ◽  
Vol 42 (2) ◽  
pp. 187-196
Author(s):  
E. M. Borschel ◽  
M. Buback
Keyword(s):  
Hydrogen Bond ◽  
High Pressure ◽  
Ir Spectroscopy ◽  
Quantitative Measurement ◽  
High Pressures ◽  
Pressure Effect ◽  
Pivalic Acid ◽  
Dilute Solution ◽  
Hydrogen Bond Strength ◽  
High Pressures And Temperatures

Pivalic acid in dilute solution of n-heptane and of CCl4 is studied via IR spectroscopy in the region of the C = O and O - H stretching fundamentals up to pressures of 2 kbar and temperatures of 175 °C. Lambert-Beer's law is shown to be valid for the C = O modes of the acid monomer and of the hydrogen-bonded cyclic dimer, which enables the quantitative measurement of the dimerization equilibrium as a function of pressure and temperature. Increasing pressure favours the dimerization in n-heptane to a larger extent than in CCl4 solution. In both solvents this pressure effect increases with temperature. The hydrogen bond strength within the dimer species is slightly reduced toward high pressure. The data on the temperature dependence of the dimerization volume and on the pressure dependence of the dimerization enthalpy are compared with direct information on both species as derived from their O - H fundamental modes.

In situ high pressure FT-IR spectroscopy on alkene hydroformylation catalysed by RhH(CO)(PPh3)3 and Co2(CO)8

2004 ◽  
Vol 357 (15) ◽  
pp. 4537-4543 ◽  
Author(s):  
Maria Caporali ◽  
Piero Frediani ◽  
Antonella Salvini ◽  
Gabor Laurenczy
Keyword(s):  
High Pressure ◽  
Ir Spectroscopy ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Comparative study of CO adsorption on zirconia polymorphs with DRIFT and transmission FT-IR spectroscopy

2018 ◽  
Vol 427 ◽  
pp. 867-873 ◽  
Author(s):  
Wei Zhou ◽  
Zhongyi Ma ◽  
Shupeng Guo ◽  
Min Wang ◽  
Jungang Wang ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Comparative Study ◽  
Co Adsorption ◽  
Ft Ir ◽  
Ft Ir Spectroscopy
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