New Acid Catalyst Comprising Heteropoly Acid on a Mesoporous Molecular Sieve MCM-41
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: 1995,
Том: 30,
Номер: 1-4,
Страницы: 241-252
Страниц
: 12
DOI:
10.1007/BF00813690
|
| Ключевые слова |
alkylation of phenols, heteropoly acid, molecular sieve MCM-41 |
| Авторы |
Kozhevnikov I.V.
1
,
Sinnema A.
2
,
Jansen R.J.
2
,
Pamin K.
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
|
|
New solid acid catalysts, consisting of heteropoly acid (HPA) H3PW12O40 (PW) supported on a mesoporous pure-silica molecular sieve MCM-41, have been prepared and characterized by nitrogen physisorption, X-ray diffraction, FT-IR, and31P magic angle spinning NMR. The PW/MCM-41 compositions with PW loadings from 10 to 50 wt% have ∼ 30 Å uniformly-sized mesopores. HPA retains the Keggin structure on the MCM-41 surface and forms finely dispersed HPA species. No HPA crystal phase is developed even at HPA loadings as high as 50 wt%. PW/MCM-41 exhibits higher catalytic activity than H2SO4 or bulk PW in liquid-phase alkylation of 4-t-butylphenol (TBP) by isobutene and styrene. In the alkylation of TBP by styrene, PW/MCM-41 shows a size selectivity compared to bulk PW and PW/SiO2, providing higher yields of a 2-(1-phenylethyl)-4-t-butylphenol, at the expense of the more bulky 2,6-bis-(1-phenylethyl)-4-t-butylphenol. The PW/MCM-41 compositions, having strong acid sites and a regular mesoporous system, are promising catalysts for the acid-type conversion and formation of organic compounds of large molecular size.