过渡金属氧化物材料ppt课件
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The interactions between organic and inorganic species:
❖ electrostatic interactions (ionic bonding) ❖ van der Waals interactions (hydrogen bonding) ❖ covalent bonding
4
Outline
Introduction Phylogeny & Property
Applications Mainly in Catalytic
OMTMO
5
Synthesis
Mechanism & Methodology
Outlook Challenge
Synthetic mechanism
Soft templating :
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
micellization self-assemble
Hydrolysis condensation
Proposed scheme for the method of Zr-TMS formation with anionic amphiphiles and zirconium n-propoxide
Research evolution of mesoporous materials
3
Introduction---properties
☺ Large surface areas
Energy sources
☺ Uniform pore size
☺ Redox activity ☺ Electric and optical properties
M. A. Carreon et al., Eur. J. Inorg. Chem. 2005, 27-43
Thermodynamics
Basic Principles
Kinetics
7
Jie Fan et al.,Chem. Mater. 2008, 20, 909–921
Soft templating (Cont.)
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
Amorphous material Structure collapses
Hard templating :
Specific topological stability Veracity Predictability Controllability
6
Ferdi Schuth, Chem. Mater. 2001, 13, 3184 -3195
MCM-41
1993/1994 Non-silica-
based mesostructured
materials
WO3
1995/1996 The first stable
mesoporous material
TiO2
1998 Mesoporous metal oxides
with semicrystalline
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
Applications Mainly in Catalytic
OMTMO
2
Synthesis
Mechanism & Methodology
Outlook Challenge
ห้องสมุดไป่ตู้
Introduction---phylogeny
1992 Periodic mesoporous silicates M41S
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
8
Soft templating (Cont.)
Covalent bonding
oligomers
❖ electrostatic interactions (ionic bonding) ❖ van der Waals interactions (hydrogen bonding) ❖ covalent bonding
4
Outline
Introduction Phylogeny & Property
Applications Mainly in Catalytic
OMTMO
5
Synthesis
Mechanism & Methodology
Outlook Challenge
Synthetic mechanism
Soft templating :
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
micellization self-assemble
Hydrolysis condensation
Proposed scheme for the method of Zr-TMS formation with anionic amphiphiles and zirconium n-propoxide
Research evolution of mesoporous materials
3
Introduction---properties
☺ Large surface areas
Energy sources
☺ Uniform pore size
☺ Redox activity ☺ Electric and optical properties
M. A. Carreon et al., Eur. J. Inorg. Chem. 2005, 27-43
Thermodynamics
Basic Principles
Kinetics
7
Jie Fan et al.,Chem. Mater. 2008, 20, 909–921
Soft templating (Cont.)
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
Amorphous material Structure collapses
Hard templating :
Specific topological stability Veracity Predictability Controllability
6
Ferdi Schuth, Chem. Mater. 2001, 13, 3184 -3195
MCM-41
1993/1994 Non-silica-
based mesostructured
materials
WO3
1995/1996 The first stable
mesoporous material
TiO2
1998 Mesoporous metal oxides
with semicrystalline
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
Applications Mainly in Catalytic
OMTMO
2
Synthesis
Mechanism & Methodology
Outlook Challenge
ห้องสมุดไป่ตู้
Introduction---phylogeny
1992 Periodic mesoporous silicates M41S
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
8
Soft templating (Cont.)
Covalent bonding
oligomers