Mesoporous alumina catalytic material prepared by grafting wide-pore MCM-41 with an alumina multilayer
Landau, MV; Dafa, E; Kaliya, ML; Sen, T; Herskowitz, M
| HERO ID | 853922 |
|---|---|
| In Press | No |
| Year | 2001 |
| Title | Mesoporous alumina catalytic material prepared by grafting wide-pore MCM-41 with an alumina multilayer |
| Authors | Landau, MV; Dafa, E; Kaliya, ML; Sen, T; Herskowitz, M |
| Journal | Microporous and Mesoporous Materials |
| Volume | 49 |
| Issue | 1-3 |
| Page Numbers | 65-81 |
| Abstract | An alumina multilayer grafted on the surface of MCM-41 produced a mesoporous material with the surface chemical functionality of alumina. The starting MCM-41 material (WPMCM) with a wide pore size distribution, a surface area of 858 m(2)/g, an average pore diameter of 9.2 nm and a pore volume of 1.75 cm(3)/g was synthesized by expanding the cetyltrimethylammonium chloride (CTAC) surfactant micelles with mesitylene at a high solubilizant/CTAC ratio of 10. Successive grafting consisting of aluminum butoxide anchoring followed by hydrolysis and calcination steps yielded a gradual increase of the aluminum content in WPMCM. Tetrahedral At in the silica pore walls and clusters of a separate octahedral At alumina phase were identified. Four grafting cycles produced a material with a surface area of 542 m(2)/g and a mean pore diameter of 4 nm containing 38 wt.%. Al(2)O(3) that displayed chemical surface functionality of pure alumina. The activity of this material in the alkylation of phenol with methanol was 2.3 times higher than the activity of a reference alumina (460 m(2)/g). The highest activity of grafted alumina in cumene cracking and isopropanol dehydration was achieved at 21 wt.% Al(2)O(3). Independent measurements of surface: charging in aqueous solution, of [Mo(7)O(24)](6-) anions adsorption and of surface acidity indicated that the material grafted with alumina and the reference alumina display similar chemical functionality. (C) 2001 Elsevier Science B.V. All rights reserved. |
| Doi | 10.1016/s1387-1811(01)00404-8 |
| Wosid | WOS:000172090500007 |
| Url | http://linkinghub.elsevier.com/retrieve/pii/S1387181101004048 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Source: Web of Science 000172090500007 |
| Is Public | Yes |
| Keyword | MCM-41; multi-step grafting; alumina-coated materials |
| Is Qa | No |