Please use this identifier to cite or link to this item:
|Title:||Preparation of Mo-embedded mesoporous carbon microspheres for friedel-crafts alkylation|
|Citation:||Dou, J., Zeng, H.C. (2012-04-12). Preparation of Mo-embedded mesoporous carbon microspheres for friedel-crafts alkylation. Journal of Physical Chemistry C 116 (14) : 7767-7775. ScholarBank@NUS Repository. https://doi.org/10.1021/jp211718w|
|Abstract:||Herein we report the preparation of Mo-embedded mesoporous carbon microspheres (Mo@C) in which molybdenum trioxide (α-MoO 3) phase as high as 42% can be included. The precursor solid synthesized from a hydrothermal route consists of highly dispersed molybdenum dioxide (MoO 2) crystals with the size of 3-6 nm. Carbonization of this solid precursor strengthens the sphere structure and generates micro- and mesopores within the resultant biphasic nanocomposite. Upon the carbonization, some of the MoO 2 nanocrystals are further reduced to Mo 2C. The oxidation states of encapsulated molybdenum can be tuned to Mo 6+ (i.e., α-MoO 3) by calcination in air at 300 °C without causing loss of carbonaceous matrixes. With this treatment, more mesopores are generated and specific surface area of sample is increased to 371 m 2/g. Interestingly, the surface of these nanocomposites is amphiphilic due to copresence of hydrophilic and hydrophobic groups, which favors the particle dispersion. The α-MoO 3 embedded mesoporous carbon microspheres show high catalytic activity toward benzylation of toluene; a 100% conversion of benzyl alcohol can be reached just within 1 h of reaction at 110 °C. On the contrary, the MoO 2/Mo 2C embedded carbon microspheres are inactive, confirming that the high oxidation state Mo 6+ accounts for active sites in this Friedel-Crafts alkylation reaction. © 2012 American Chemical Society.|
|Source Title:||Journal of Physical Chemistry C|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Oct 16, 2018
WEB OF SCIENCETM
checked on Oct 8, 2018
checked on Oct 5, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.