Influence of the incorporated metal on template removal from MCM-41 type mesoporous materials |
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Authors: | Luiz K C de Souza Juliana J R Pardauil José R Zamian Geraldo N da Rocha Filho Carlos E F da Costa |
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Institution: | 1.Laboratório de Catálise e Oleoquímica, ICEN,UFPA,Belém,Brazil |
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Abstract: | Al-modified MCM-41, La-modified MCM-41, and Ce-modified MCM-41 mesoporous materials were prepared with different molar ratios
(Si/M = 10; 25; 50; 100 and 200) at room temperature. The materials were characterized using XRD, BET–BJH, and TG–DTA. The
XRD showed four peaks, due to the ordered hexagonal array of parallel silica tubes, which could be indexed as (100), (110),
(200), and (210), assuming a hexagonal unit cell. The surface area decreased as the concentration of the metal incorporated
in the material increased. The thermal stability of the materials was around 650 °C. The CeO2 phase made the mass transfer process more difficult, hindering Hofmann degradation and favoring oxidation. |
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