17O NMR Determination of Proton Sites in Solid Heteropoly Acid H3PW12O40. 31P, 29Si and 17O NMR, FT-IR and XRD Study of H3PW12O40 and H4SiW12O40 Supported on Carbon
Научная публикация
| Общее |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Оригинальная
|
| Журнал |
Catalysis Letters
ISSN: 1011-372X
, E-ISSN: 1572-879X
|
| Вых. Данные |
Год: 1994,
Том: 27,
Номер: 1-2,
Страницы: 187-197
Страниц
: 11
DOI:
10.1007/BF00806992
|
| Ключевые слова |
31P29Si and17O MAS NMR, determination of proton sites, FT-IR, heteropoly acids supported on carbon, tungsten heteropoly acids, XRD |
| Авторы |
Kozhevnikov I.V.
1
,
Sinnema A.
2
,
Jansen R.J.
2
,
van Bekkum H.
2
|
| Организации |
| 1 |
Boreskov Institute of Catalysis, 630090 Novosibirsk, Russia
|
| 2 |
Laboratory of Organic Chemistry and Catalysis, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
|
|
Информация о финансировании (1)
|
1
|
Netherlands Organisation for Scientific Research
|
|
17O MAS NMR spectra for solid heteropoly acid (HPA) H3PW12O40 are reported. Comparison of solid-state and solution 17O resonances shows that in the solid dehydrated H3PW12O40 terminal W=O oxygen atoms are the predominant protonation sites. H3PW12O40 and H4SiW12O40 supported on chemically activated carbon have been studied by means of NMR, FT-IR and XRD. The carbon-supported HPA's retain their Keggin structure and form finely dispersed HPA species. No HPA crystal phase is developed even at an HPA loading as high as 45 wt%.31P, 29Si and 17O MAS NMR spectra for bulk and carbon-supported HPA's indicate interaction of the HPA Keggin units with the carbon surface, causing large line broadening in the NMR spectra.