Preparation of MCM-41 with high structural stability
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 t...
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Published in | Ceramics international Vol. 30; no. 6; pp. 817 - 822 |
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Language | English |
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2004
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Abstract | 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. |
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AbstractList | MCM-41 molecular sieves with high structural stability and long-range order were synthesised using ethylamine (EA) as an additive instead of mineralisers such as NaOH and TPAOH. XRD 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 N2 adsorption-desorption isotherm analysis, suggests the EA participates in the templating process of the mesostructure. 15 refs. 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. |
Author | Ahn, Ji-Whan Lee, Hyoung-Ho Kim, Hwan |
Author_xml | – sequence: 1 givenname: Hyoung-Ho surname: Lee fullname: Lee, Hyoung-Ho organization: School of Materials Science and Engineering, Seoul National University, Seoul 151-742, South Korea – sequence: 2 givenname: Ji-Whan surname: Ahn fullname: Ahn, Ji-Whan organization: Institute of Geoscience & Mineral Resources, Taejon 305-350, South Korea – sequence: 3 givenname: Hwan surname: Kim fullname: Kim, Hwan email: hwan94@snu.ac.kr organization: School of Materials Science and Engineering, Seoul National University, Seoul 151-742, South Korea |
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Keywords | 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 |
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Snippet | MCM-41 molecular sieves with high structural stability and long-range order were synthesized using ethylamine (EA) as an additive instead of mineralizers such... MCM-41 molecular sieves with high structural stability and long-range order were synthesised using ethylamine (EA) as an additive instead of mineralisers such... |
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SubjectTerms | 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 |
Title | Preparation of MCM-41 with high structural stability |
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