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Title: Electron spin echo modulation and electron spin resonance studies of cupric ions in H-ZSM-5, Na-ZSM-5, K-ZSM-5, and Ca-ZSM-5 zeolites: analysis of /sup 13/C electron spin echo modulation

Abstract

The interaction of Cu/sup 2 +/ with deuteriated and /sup 13/C-labeled adsorbates in ZSM-5 zeolites was examined by electron spin resonance and electron spin echo modulation spectroscopies. Cu/sup 2 +/ is found to form complexes with six molecules of water and four molecules of ammonia in each of the zeolites studied. However, the ability of Cu/sup 2 +/ to complex with either methanol or ethanol depends upon the cocation. When the cocation is Na/sup +/, K/sup +/, or Ca/sup 2 +/, cupric ion coordinates to three molecules of CH/sub 3/OH or C/sub 2/H/sub 5/OH, but it coordinates to four alcohol molecules in H-ZSM-5. These results suggest that there is a steric effect associated with the larger cations that inhibits the formation of larger alcohol complexes.

Authors:
;
Publication Date:
Research Org.:
Univ. of Houston, TX (USA)
OSTI Identifier:
6221300
Resource Type:
Journal Article
Journal Name:
J. Phys. Chem.; (United States)
Additional Journal Information:
Journal Volume: 92:18
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 33 ADVANCED PROPULSION SYSTEMS; CALCIUM COMPOUNDS; STRUCTURAL CHEMICAL ANALYSIS; COPPER COMPOUNDS; DEUTERIUM COMPOUNDS; HYDROGEN COMPOUNDS; POTASSIUM COMPOUNDS; SODIUM COMPOUNDS; ACOUSTIC ESR; AMMONIA; CARBON 13; CATIONS; ELECTRON SPIN RESONANCE; ETHANOL; EXPERIMENTAL DATA; METHANOL; WATER; ZEOLITES; ALCOHOLS; ALKALI METAL COMPOUNDS; ALKALINE EARTH METAL COMPOUNDS; CARBON ISOTOPES; CHARGED PARTICLES; DATA; EVEN-ODD NUCLEI; HYDRIDES; HYDROXY COMPOUNDS; INFORMATION; INORGANIC ION EXCHANGERS; ION EXCHANGE MATERIALS; IONS; ISOTOPES; LIGHT NUCLEI; MAGNETIC RESONANCE; MATERIALS; MINERALS; NITROGEN COMPOUNDS; NITROGEN HYDRIDES; NUCLEI; NUMERICAL DATA; ORGANIC COMPOUNDS; OXYGEN COMPOUNDS; RESONANCE; STABLE ISOTOPES; TRANSITION ELEMENT COMPOUNDS; 400201* - Chemical & Physicochemical Properties; 330700 - Advanced Propulsion Systems- Emission Control

Citation Formats

Sass, C.E., and Kevan, L. Electron spin echo modulation and electron spin resonance studies of cupric ions in H-ZSM-5, Na-ZSM-5, K-ZSM-5, and Ca-ZSM-5 zeolites: analysis of /sup 13/C electron spin echo modulation. United States: N. p., 1988. Web. doi:10.1021/j100329a026.
Sass, C.E., & Kevan, L. Electron spin echo modulation and electron spin resonance studies of cupric ions in H-ZSM-5, Na-ZSM-5, K-ZSM-5, and Ca-ZSM-5 zeolites: analysis of /sup 13/C electron spin echo modulation. United States. doi:10.1021/j100329a026.
Sass, C.E., and Kevan, L. Thu . "Electron spin echo modulation and electron spin resonance studies of cupric ions in H-ZSM-5, Na-ZSM-5, K-ZSM-5, and Ca-ZSM-5 zeolites: analysis of /sup 13/C electron spin echo modulation". United States. doi:10.1021/j100329a026.
@article{osti_6221300,
title = {Electron spin echo modulation and electron spin resonance studies of cupric ions in H-ZSM-5, Na-ZSM-5, K-ZSM-5, and Ca-ZSM-5 zeolites: analysis of /sup 13/C electron spin echo modulation},
author = {Sass, C.E. and Kevan, L.},
abstractNote = {The interaction of Cu/sup 2 +/ with deuteriated and /sup 13/C-labeled adsorbates in ZSM-5 zeolites was examined by electron spin resonance and electron spin echo modulation spectroscopies. Cu/sup 2 +/ is found to form complexes with six molecules of water and four molecules of ammonia in each of the zeolites studied. However, the ability of Cu/sup 2 +/ to complex with either methanol or ethanol depends upon the cocation. When the cocation is Na/sup +/, K/sup +/, or Ca/sup 2 +/, cupric ion coordinates to three molecules of CH/sub 3/OH or C/sub 2/H/sub 5/OH, but it coordinates to four alcohol molecules in H-ZSM-5. These results suggest that there is a steric effect associated with the larger cations that inhibits the formation of larger alcohol complexes.},
doi = {10.1021/j100329a026},
journal = {J. Phys. Chem.; (United States)},
number = ,
volume = 92:18,
place = {United States},
year = {1988},
month = {9}
}