Aluminum coordination and active sites on aluminas, Y zeolites and pillared layered silicates. Progress report, June 1, 1990--August 31, 1991
This report covers the activity of the laboratory over 15 months, from June 1, 1990 until August 31, 1991. Our work has been deployed in four directions, namely, (1) Study of the distribution of aluminum within three possible kinds of coordination shells: four-fold (4), five-fold(5), and six-fold(6), in aluminas and dealuminated zeolites by high-resolution solid state NMR or MAS NMR. Besides the classical one pulse spectra, nutation spectra have been studied. (2) Study of the electron deficient sites by electron paramagnetic resonance (EPR) of probe molecules on aluminas and decationated zeolites. Electron deficient sites are considered as Lewis sites. (3) Study of the model isomerization reaction 1 butene {yields} 2 cis or trans butene on the aluminas characterized in (1) and (2). (4) Synthesis of a silicate lattice in which silicon has been partially replaced by aluminum. The chosen silicate is that of zeolitic (fibrous) sepiolite.
- Research Organization:
- Wisconsin Univ., Milwaukee, WI (United States). Dept. of Chemistry
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-90ER14130
- OSTI ID:
- 10116702
- Report Number(s):
- DOE/ER/14130--1; ON: DE92006746
- Country of Publication:
- United States
- Language:
- English
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