Zobrazeno 1 - 10
of 15
pro vyhledávání: '"M. J. Peltre"'
Publikováno v:
Colloids and Surfaces A: Physicochemical and Engineering Aspects. :319-325
The interaction of phenol with zeolite NaX has been studied by 1H and 29Si MAS and 29Si-CP-MAS NMR spectroscopy. A large displacement of the chemical shift of hydroxyl protons from 1.2 ppm in the crystalline state to about 9 ppm occurs upon H-bonding
Publikováno v:
The Journal of Physical Chemistry. 99:8270-8276
SAPO-34 (chabasite structure) is studied with regard to decomposition of the template [tetraethylammonium hydroxide (TEAOH) or morpholine] and subsequent hydration-dehydration cycles over a period of few hours up to 2 years. XRD, IR, 27Al and 29Si MA
Publikováno v:
The Journal of Physical Chemistry. 98:9614-9618
Publikováno v:
The Journal of Physical Chemistry. 97:13730-13735
The interaction of bases (pyridine, 2,6-dimethylpyridine) is studied on SAPO-37, pretreated at nonusual high temperatures from 873 to 1173 K. XRD, infrared, and 31 P, 27 Al, and 29 Si MAS NMR spectroscopies are used, the spectra being recorded in the
Autor:
Pascal P. Man, M. J. Peltre, Pascale Massiani, R. Vomscheid, Denise Barthomeuf, M. Derewinski, M. Briend
Publikováno v:
Studies in Surface Science and Catalysis ISBN: 9780444818478
XRD, IR and 29Si MAS NMR are used to characterize three SAPO's(5, 34 and 37). The changes in structure or arrangement of T atoms are shown to strongly depend on heating conditions(muffle oven, vacuum or flow of gas). Even when the initial crystalline
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4dfa1cfc43202f069b04a7ffdb5b132f
https://doi.org/10.1016/s0167-2991(08)64165-8
https://doi.org/10.1016/s0167-2991(08)64165-8
Publikováno v:
Chemical Communications. :87-88
V-loaded β zeolites can be prepared by a two-step post-synthesis method which consists of first creating vacant T-sites by dealumination of the β zeolite with nitric acid, then contacting them with an ammonium metavanadate solution; the SiOH consum
Publikováno v:
Chemical Communications. :1325
The interaction of bare Pd2+ ions with framework oxygen in PdNaX calcined at 500°C results in an unusual 29Si MAS NMR band at δ– 79.5; line intensities indicate that bare Pd2+ ions are located preferentially close to highly basic sites exhibiting
Publikováno v:
Journal of the Chemical Society, Chemical Communications. :544
On hydration template-free SAPO-34 shows the opening of some Si–O–Al bonds as suggested by 29Si MAS NMR and XRD results, the effect being reversible upon dehydration; the hydrated distorted structure is stable for months with no further modificat
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