Synthesis of ordered cerium-doped cubic mesoporous silica using long-chain ionic liquid as template

Abstract

The long-chain ionic liquid 1-hexadecyl-3-methylimidazolium chloride (C₁₆mimCl) was used as a template to prepare cerium-doped MCM-48 materials in basic medium by a hydrothermal synthesis procedure. The effect of the amount of Ce salt and C₁₆mimCl/Si on the synthesis were discussed in detail. This mesoporous material exhibits a pore architecture which is cubic Ia3d gyroid and possesses a large surface area and a narrow pore distribution. Cerium in calcined porous framework exists in the form of well-dispersed tetrahedral coordination. The C₁₆mimCl shows a high tendency toward self-aggregation that allows the formation of the cerium-doped gyroid mesostructure by using the appropriate amount of Ce salt.

References

1. Laha S C Mukherjee P Sainkar S R Kumar R Cerium containingMCM-41-type mesoporous materials and their acidic and redox catalyticpropertiesJ Catal 2002 207213223. doi:10.1006/jcat.2002.3516
2. Kadgaonkar M D Laha S C Pandey R K Kumar P Mirajkar S P Kumar R Cerium-containingMCM-41 materials as selective acylation and alkylation catalystsCatal Today 2004 97225231. doi:10.1016/j.cattod.2004.07.009
3. Yao W H Chen Y J Min L Fang H Yan Z Y Wang H L Wang J Q Liquid oxidation of cyclohexaneto cyclohexanol over cerium-doped MCM-41J Mol Catal A: Chem 2006 246162166. doi:10.1016/j.molcata.2005.10.029
4. Shao Y F Wang L Z Zhang J L Anpo M Synthesis ofhydrothermally stable and long-range ordered Ce-MCM-48 and Fe-MCM-48materialsJ Phys Chem B 2005 109(44)2083520841. doi:10.1021/jp054024+
5. Jin Z X Tong H W Yong G P Sheng L Q Liu Q L Liu S M Synthesis,characterization and application of Ce-MCM-48 as a mesoporous molecularSieveChin J Chem Phys 2005 12(6)10571061 (in Chinese)
6. Welton T Room-temperatureionic liquids: solvents for synthesis and catalysisChem Rev 1999 9920712083. doi:10.1021/cr980032t
7. Seddon K R Ionicliquids: a taste of the futureNat Mater 2003 2363365. doi:10.1038/nmat907
8. Bleasdale T A Tiddy G J T Wyn-Jones E Cubic phase formation in polar nonaqueous solventsJ Phys Chem 1991 95(14)53855386. doi:10.1021/j100167a007
9. Neve F Francescangeli O Crispini A Crystal architecture and mesophase structure of long-chainN-alkylpyridinium tetrachlorometallatesInorg Chim Acta 2002 3385158. doi:10.1016/S0020‐1693(02)00976‐3
10. Lee C K Huang H W Lin I J B Simple amphiphilic liquid crystalline N-alkylimidazoliumsalts. A new solvent system providing a partially ordered environmentChem Commun 2000 19111912
11. Antonietti M Kuang D B Smarsly B Zhou Y Ionic liquidsfor the convenient synthesis of functional nanoparticles and otherinorganic nanostructuresAngew Chem IntEd 2004 4349884992. doi:10.1002/anie.200460091
12. Zhou Y Antonietti M Preparation of highly orderedmonolithic super-microporous lamellar silica with a room-temperatureionic liquid as template via the nanocasting techniqueAdv Mater 2003 1514521455. doi:10.1002/adma.200305265
13. Zhou Y Antonietti M A series of highly ordered,super-microporus, lamellar silicas prepared by nanocasting with ionicliquidsChem Mater 2004 16544550. doi:10.1021/cm034442w
14. Wang T W Kaper H Antonietti M Smarsly B Templating behaviorof a long-chain ionic liquid in the hydrothermal synthesis of mesoporoussilicaLangmuir 2007 2314891495. doi:10.1021/la062470y
15. Seddon K R Stark A Torres M J Influence of chloride water and organic solvents on thephysical properties of ionic liquidsPureAppl Chem 2000 7222752287. doi:10.1351/pac200072122275
16. Kresge C T Leonowicz M E Roth W J Vartuli J C Beck J S Ordered mesoporous molecular sieves synthesizedby a liquid-crystal template mechanismNature 1992 359710712. doi:10.1038/359710a0
17. Huo Q Margolese D I Stucky G D Surfactant control of phases in the synthesis of mesoporoussilca-based materialsChem Mater 1996 811471160. doi:10.1021/cm960137h
18. Alfredsson V Anderson M W Structure of MCM-48 revealedby transmission electron microscopyChemMater 1996 811411146. doi:10.1021/cm950568k
19. Morey M S Brien S O Schwarz S Stucky G D Hydrothermaland postsynthesis surface modification of Cubic, MCM-48, and ultralargepore SBA-15 mesoporous silica with titaniumChem Mater 2000 12898911. doi:10.1021/cm9901663