{sup 65}Cu NMR spectroscopy of Cu-exchanged ZSM-5 catalysts

Journal Article · Thu Mar 06 04:00:00 EST 1997 · Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical

DOI:https://doi.org/10.1021/jp9630380· OSTI ID:501897

Hu, S; Reimer, J A; Bell, A T ^[1]

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1. Lawrence Berkeley National Lab., CA

{sup 65}Cu NMR and {sup 65}/Cu-{sup 27}/Al spin-echo, double-resonance (SEDOR) measurements from Cu-exchanged ZSM-5 catalysts are reported. The presence of Cu{sup +} cations in CuZSM-5 was detected directly by {sup 65}/Cu NMR; upon heating, we observed the autoreduction of Cu{sup 2+} to Cu{sup +}. It was found that the Cu{sup +}/cations can be reduced further to Cu{sup 0} by exposure to carbon monoxide at high temperatures. The intermolecular distance between the two quadrupolar nuclei Cu (spin-3/2) and Al (spin-5/2) was determined to be 0.23 {+-} 0.02 nm, in good agreement with the value of 0.24 nm obtained from density functional theory calculations. 23 refs., 3 figs.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 501897
• Journal Information: Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical, Journal Name: Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical Journal Issue: 10 Vol. 101; ISSN 1089-5647; ISSN JPCBFK
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
40 CHEMISTRY
AIR POLLUTION CONTROL
ALUMINIUM 27
AUTOMOBILES
CARBON MONOXIDE
CATALYSTS
CATIONS
CHARGE EXCHANGE
COPPER 65
DENSITY
EXHAUST GASES
NITROGEN OXIDES
NUCLEAR MAGNETIC RESONANCE
QUADRUPOLES
SPIN ECHO
TEMPERATURE DEPENDENCE
ZEOLITES