Please use this identifier to cite or link to this item:
https://doi.org/10.1021/ja3055723
DC Field | Value | |
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dc.title | Targeted synthesis of silicomolybdic acid (keggin acid) inside mesoporous silica hollow spheres for friedel-crafts alkylation | |
dc.contributor.author | Dou, J. | |
dc.contributor.author | Zeng, H.C. | |
dc.date.accessioned | 2014-10-09T07:03:41Z | |
dc.date.available | 2014-10-09T07:03:41Z | |
dc.date.issued | 2012-10-03 | |
dc.identifier.citation | Dou, J., Zeng, H.C. (2012-10-03). Targeted synthesis of silicomolybdic acid (keggin acid) inside mesoporous silica hollow spheres for friedel-crafts alkylation. Journal of the American Chemical Society 134 (39) : 16235-16246. ScholarBank@NUS Repository. https://doi.org/10.1021/ja3055723 | |
dc.identifier.issn | 00027863 | |
dc.identifier.uri | http://scholarbank.nus.edu.sg/handle/10635/90301 | |
dc.description.abstract | Herein we report an inside-out preinstallation-infusion-hydration method for targeted synthesis of Keggin heteropoly acids (silicomolybdic acid, H 4SiMo12O40) within mesoporous silica (SiO 2) hollow spheres. In this process, discrete molybdenum dioxide (MoO2) nanoparticles with diameter size ranging from 25 to 60 nm were first prepared by a one-pot hydrothermal route in water/ethanol mixed solvents at 180 °C, which were then used as cores to grow the shell of supramolecular templated silica with tetraethyl orthosilicate (TEOS) and hexadecyltrimethyl- ammonium chloride (CTACl) in alkaline solution. By thermal treatment of as-synthesized MoO2@SiO2 core-shell spheres, the organic template was burned off and mesoporous shell was formed (BET specific surface area was as high as 872 m2/g). Meanwhile, the encapsulated MoO 2 was oxidized to Mo6+ and infused to the mesoporous silica shells, forming heptamolybdate species (Mo7O24 6-) uniformly dispersed on the mesopore surfaces of silica, while generating void space at the center of spheres. After hydration with water, H4SiMo12O40 was formed by reaction between the surface Mo7O24 6- and silica species in the presence of water. The prepared H4SiMo12O40 @mSiO2 hollow spheres were tested for Friedel-Crafts alkylation of toluene by benzyl alcohol. The H4SiMo12O 40@mSiO2 catalysts fabricated via this novel route exhibited excellent catalytic activity toward benzylation of toluene, which was approximately 2.6 times as high as that of commercial Amberlyst-15 catalyst. In addition, the H4SiMo12O40@mSiO2 catalyst was very robust and could be reused after regeneration. © 2012 American Chemical Society. | |
dc.description.uri | http://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1021/ja3055723 | |
dc.source | Scopus | |
dc.type | Article | |
dc.contributor.department | CHEMICAL & BIOMOLECULAR ENGINEERING | |
dc.description.doi | 10.1021/ja3055723 | |
dc.description.sourcetitle | Journal of the American Chemical Society | |
dc.description.volume | 134 | |
dc.description.issue | 39 | |
dc.description.page | 16235-16246 | |
dc.description.coden | JACSA | |
dc.identifier.isiut | 000309335000028 | |
Appears in Collections: | Staff Publications |
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