Titanium-Doped Solid Core-Mesoporous Shell Silica Particles: Synthesis and Catalytic Properties in Selective Oxidation reactions
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
Catalysis Letters
ISSN: 1011-372X
, E-ISSN: 1572-879X
|
| Output data |
Year: 2009,
Volume: 127,
Number: 1-2,
Pages: 75-82
Pages count
: 8
DOI:
10.1007/s10562-008-9632-0
|
| Tags |
Core-shell structure, H2O2, Monodisperse silica particles, Selective oxidation, Site-isolated Ti centers |
| Authors |
Barmatova Marina V.
1
,
Ivanchikova Irina D.
1
,
Kholdeeva Oxana A.
1
,
Shmakov Alexander N.
1
,
Zaikovskii Vladimir I.
1
,
Melʹgunov Maxim S.
1
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis SB RAS
|
|
Funding (2)
|
1
|
Russian Foundation for Basic Research
|
05-03-34760
|
|
2
|
Russian Foundation for Basic Research
|
06-03-08102
|
Near monodisperse spherical particles composed of a nonporous silica core covered by a Ti-doped hexagonally arranged mesoporous silica shell, Ti-SCMS, as well as spherical submicron-size particles of Ti-MCM-41, have been synthesized for the first time and characterized by elemental analysis, N2 adsorption, XRD, TEM and DR-UV spectroscopy. The mesoporous Ti,Si-shell has a thickness of about 45 nm and incorporates isolated Ti centers in tetrahedral coordination. Catalytic properties of Ti-SCMS and Ti-MCM-41 have been studied in selective oxidation of three representative bulky organic substrates, 2,3,6-trimethylphenol, methyl phenyl sulfide and caryophyllene, with aqueous H2O2 in MeCN medium. Ti-SCMS appeared to be more active and selective in the H2O2-based selective oxidation reactions compared to Ti-MCM-41, thus demonstrating an advantage of conducting a catalytic process in a thin mesoporous Ti,Si-shell.