过渡金属氧化物材料
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MCM-41
1993/1994 Non-silica-
based mesostructured
materials
WO3
1995/1996 The first stable
mesoporous material
TiO2
1998 Mesoporous metal oxides
with semicrystalline
micellization self-assemble Hydrolysis condensation
Proposed scheme for the method of Zr-TMS formation with anionic amphiphiles and zirconium n-propoxide
framework
ZrO2
2003 The first mesoporous materials with
single crystalline wall
Cr2O3
Nature, 1992, 359, 710 Nature, 1994,368:317 Angew. Chem.,1995,34, 2014 Nature, 1998, 396, 152 Chem. Commun., 2003, 98
Anionic amphiphile-zirconium n-propoxide interaction
Nonionic amphiphile-zirconium isopropoxide interaction
Soft templating (Cont.)
Covalent bonding
oligomers
Research evolution of mesoporous materials
Introduction---properties
Large surface areas
Energy sources
Uniform pore size
Redox activity Electric and optical properties
Seminar I (2008.5.27)
Research Progress of Ordered Mesoporous Transition-Metal Oxides Materials
指导教师：申文杰 研究员 研 究 生：郭小惠
Outline
Introduction Phylogeny & Property
Outline
Introduction Phylogeny & Property
Applications Mainly in Catalytic
OMTMO
Synthesis
Mechanism & Methodology
Outlook Challenge
Synthetic mechanism
Soft templating :
M. A. Carreon et al., Eur. J. Inorg. Chem. 2005, 27-43
Thermodynamics
Basic Principles
Kinetics
Jie Fan et al.,Chem. Mater. 2008, 20, 909–921
Soft templating (Cont.)
Amorphous material Structure collapses
Hard templating :
Specific topological stability Veracity Predictability Controllability
Ferdi Schuth, Chem. Mater. 2001, 13, 3184 -3195
Applications Mainly in CaHale Waihona Puke Baidualytic
OMTMO
Synthesis
Mechanism & Methodology
Outlook Challenge
Introduction---phylogeny
1992 Periodic mesoporous silicates M41S
The interactions between organic and inorganic species:
electrostatic interactions (ionic bonding) van der Waals interactions (hydrogen bonding) covalent bonding
Soft templating
The thermal stability of mesostructured metal-oxide phases depends on:
1. The degree of charge-matching at the organic–inorganic interface---isoelectric points 2. The strength of interactions between inorganic species and surfactant head-groups 3. The flexibility of the M–O–M bond angles in the constituent metal oxides 4. The Tammann temperature of the metal oxide 5. The occurrence of redox reactions in the metal-oxide wall
Sensor
Photoelectricity
OMTMO
Catalysis
Electrochemistry
Electromagnetism
Challenges for transition metal oxides synthesis:
Lack of knowledge about other elements except for silicon and aluminum Uncontrolled condensation yields macroscopic phase segregation Difficult to remove the templates and create porous materials
1993/1994 Non-silica-
based mesostructured
materials
WO3
1995/1996 The first stable
mesoporous material
TiO2
1998 Mesoporous metal oxides
with semicrystalline
micellization self-assemble Hydrolysis condensation
Proposed scheme for the method of Zr-TMS formation with anionic amphiphiles and zirconium n-propoxide
framework
ZrO2
2003 The first mesoporous materials with
single crystalline wall
Cr2O3
Nature, 1992, 359, 710 Nature, 1994,368:317 Angew. Chem.,1995,34, 2014 Nature, 1998, 396, 152 Chem. Commun., 2003, 98
Anionic amphiphile-zirconium n-propoxide interaction
Nonionic amphiphile-zirconium isopropoxide interaction
Soft templating (Cont.)
Covalent bonding
oligomers
Research evolution of mesoporous materials
Introduction---properties
Large surface areas
Energy sources
Uniform pore size
Redox activity Electric and optical properties
Seminar I (2008.5.27)
Research Progress of Ordered Mesoporous Transition-Metal Oxides Materials
指导教师：申文杰 研究员 研 究 生：郭小惠
Outline
Introduction Phylogeny & Property
Outline
Introduction Phylogeny & Property
Applications Mainly in Catalytic
OMTMO
Synthesis
Mechanism & Methodology
Outlook Challenge
Synthetic mechanism
Soft templating :
M. A. Carreon et al., Eur. J. Inorg. Chem. 2005, 27-43
Thermodynamics
Basic Principles
Kinetics
Jie Fan et al.,Chem. Mater. 2008, 20, 909–921
Soft templating (Cont.)
Amorphous material Structure collapses
Hard templating :
Specific topological stability Veracity Predictability Controllability
Ferdi Schuth, Chem. Mater. 2001, 13, 3184 -3195
Applications Mainly in CaHale Waihona Puke Baidualytic
OMTMO
Synthesis
Mechanism & Methodology
Outlook Challenge
Introduction---phylogeny
1992 Periodic mesoporous silicates M41S
The interactions between organic and inorganic species:
electrostatic interactions (ionic bonding) van der Waals interactions (hydrogen bonding) covalent bonding
Soft templating
The thermal stability of mesostructured metal-oxide phases depends on:
1. The degree of charge-matching at the organic–inorganic interface---isoelectric points 2. The strength of interactions between inorganic species and surfactant head-groups 3. The flexibility of the M–O–M bond angles in the constituent metal oxides 4. The Tammann temperature of the metal oxide 5. The occurrence of redox reactions in the metal-oxide wall
Sensor
Photoelectricity
OMTMO
Catalysis
Electrochemistry
Electromagnetism
Challenges for transition metal oxides synthesis:
Lack of knowledge about other elements except for silicon and aluminum Uncontrolled condensation yields macroscopic phase segregation Difficult to remove the templates and create porous materials