Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 186, Issue -, Pages 208-216Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2011.12.018
Keywords
Nanotechnology; Mesoporous silica; Catalyst; Pore expansion; Heteroatoms
Funding
- Shanghai Pujiang Program [09PJ1403000]
- Research Fund for the Doctoral Program of Higher Education [20090074120009]
- Natural Science Foundation of China [51072053, 21001043]
- New Century Excellent Talents in University [NCET-10-0379]
- Fundamental Research Funds for the Central Universities [WD0911012, WK1013001]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT0825]
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An effective post-hydrothermal treatment strategy has been developed to dope highly dispersed iron catalytical centers into the framework of mesoporous silica, to keep the particle size in nanometric scale, and in the meanwhile, to expand the pore size of the synthesized mesoporous silica nanoparticles (MSNs). Characterization techniques such as XRD, BET, SEM and TEM support that the synthesized samples are long period ordered with particles size about 100 nm and a relatively large pore size of ca. 3.5 nm. UV-vis, XPS and EPR measurements demonstrate that the introduced iron active centers are highly dispersed in a coordinatively unsaturated status. NH3-TPD verifies that the acid amount of iron-doped MSNs is quite high. The synthesized nanocatalysts show an excellent catalytic performance for benzylation of benzene by benzyl chloride, and they present relatively higher yield and selectivity to diphenylmethane with a lower iron content and much shorter reaction time. (C) 2011 Elsevier Inc. All rights reserved.
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