Preparation of MCM-41 with high structural stability

• Published in: Ceramics international Vol. 30; no. 6; pp. 817 - 822
• Main Authors: Lee, Hyoung-Ho, Ahn, Ji-Whan, Kim, Hwan
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 2004; Elsevier Science
• Subjects: A. Sol–gel processes; B. Porosity; Chemistry; Colloidal state and disperse state; D. Silicate; Exact sciences and technology; General and physical chemistry; MCM-41; Porous materials; A. Sol–gel processes; B. Porosity; D. Silicate; MCM-41; Quaternary ammonium compound; High resolution; Transmission electron microscopy; Stability; Sol gel process; Preparation; Cationic surfactant; Porosity; Silicates; Small angle X ray scattering; Molecular sieve
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2003.09.016

MCM-41 molecular sieves with high structural stability and long-range order were synthesized using ethylamine (EA) as an additive instead of mineralizers such as NaOH and TPAOH. X-ray diffraction showed that the EA/CTAB (cetyltrimethylammonium bromide) ratio was the critical factor that determines the degree of ordering in MCM-41, and an EA/CTAB ratio of 0.2 or 0.5 produced the highest long-range order. The samples had walls approximately 2 nm thick, which is the highest level ever reported. Therefore, they did not lose their structure entirely even after heat treatment at 1000 °C. Together with the effect of the EA/CTAB ratio, the textural mesoporosity, as confirmed from the N 2 adsorption–desorption isotherm analysis, suggests the EA participates in the templating process of the mesostructure.