r x1
TRANSCRIPT
ResultsStability and sample selection :
•Equilibrium measurements: The Langmuir model fits well to all equilibrium data
Introduction
New family of microporous adsorbents: Metal Organic Framework (MOF)
•Highly crystalline with 3D structure•High surface area and pore volume good for gas adsorption and storage
•Copper (ΙΙ) benzene-1,3,5tricarboxylate (Cu-BTC) has been synthesized•Some of the Natural Gas components have been selected to conduct adsorption and kinetic measurements: CH4 , CO2 , N2
Figure 1. Metal Organic Framework (MOF-5)
Metal ions
Organic LinkersGas Molecule
Figure 2. Crystal structure of Cu-BTC
Materials and methods
•Synthesis: Cu-BTC synthesized in our laboratory
dissolved in 12 ml Ethanol
3.6 mmolCu(NO3)2.3H2O
2.0 mmol Trimesicacid
dissolve in 12 ml de-ionized water
Mix solution 1 and 2 for 10 min
Transfer mixture into 50ml Teflon
linerPut in the autoclave and
heat at 393K for 12 hFilter the blue crystals
of Cu-BTC
Figure 5. (a) Scanning Electron Microscopy (SEM) of synthesized Cu-BTC and (b) Preparing synthesized powder for adsorption experiments
(a) (b)
1 1 1s
s
q bcq b C Kcqq b C bc bc
= ⇒ = =+ + +
0g
UR Tb b e
−∆
=
•Comparison of Cu-BTC with AC & Zeolite13X:
References:
1. S. S.-Y. Chui et al., “A chemically functionalizable nanoporous material [Cu3(TMA)2(H2O)3]n”, 1999.
2. K. Schlichte, T. Kratzke and S. Kaskel, “Improved synthesis, thermal stability and catalytic properties of the metal-organic framework compound Cu3(BTC)2”, 2004
3. H. Dathe, A. Jentys and J. A. Lercher, “Sulfate formation on SOx trapping materials studieby Cu and S K-edge XAFS”, 2005
4. Wong Ian Rhee, “Development of an adsorption based process for CO2 capture from flue gas”, FYP Thesis, 2007
Adsorption of gases in Cu-BTC
Shima Najafi Nobar, Shamsuzzaman FarooqDepartment of Chemical and Biomolecular Engineering, National University of Singapore,
4 Engineering Drive 4,Singapore-117576E-mail :[email protected]
CO2 N2
Sample1
Figure 3. Trimesicacid is an organic linker in Cu-BTC structure
Inte
nsity
2θ
Dose chamber
Reference Chamber
Test chamber
Figure 6. Experimental Setup (Constant Volume)
Sample 2
Synthesized at 393K
Synthesized at 453K
Sample 1
Figure 3. X-ray diffraction (XRD) of Cu-BTC synthesized at two different temperatures
CO2CH4 N2
q (m
mol
/cc)
q (m
mol
/cc)
q (m
mol
/cc)
b (c
c/m
mol
)
Conclusions and Future Works:
MOFs are promising materials for gas separation and storageLower temperature synthesis favors better crystalinityLangmuir model fitts well to N2, CH4 and CO2 equilibrium dataCu-BTC is good for CO2/N2 and CO2/CH4 separation
Kinetic measurements of mentioned gases on Cu-BTC are in progressH2S and SO2 will come to the picture as Natural Gas components in future measurements
2θ
•Langmuir isotherm:
Powder
Pellet
Cut into small pieces
CO2/N2 CO2/CH4
CO2 @ 22°C CO2 @ 22° C
Sample1
Sample2
c (mmol/cc)
q (m
mol
/cc)
q (m
mol
/cc)
c (mmol/cc)
c (mmol/cc) c (mmol/cc) c (mmol/cc)