1. Adsorption of gases in Cu-BTC
Shima Najafi Nobar, Shamsuzzaman Farooq
Department of Chemical and Biomolecular Engineering, National University of Singapore,
4 Engineering Drive 4,Singapore-117576
E-mail :shima.najafinobar@nus.edu.sg
Introduction
Results
New family of microporous adsorbents: Metal Organic Framework (MOF)
Stability and sample selection :
CO2 @ 22°C
good for gas adsorption and
CO2 @ 22° C
q (mmol/cc)
•High surface area and pore volume
storage
Sample1
Metal ions
Sample2
q (mmol/cc)
•Highly crystalline with 3D structure
Gas Molecule
Organic Linkers
c (mmol/cc)
c (mmol/cc)
•Equilibrium measurements: The Langmuir model fits well to all
equilibrium data
q (mmol/cc)
•Some of the Natural Gas
Figure 3. Trimesic
acid is an organic
linker in Cu-BTC
structure
components have been selected
to conduct adsorption and kinetic
c (mmol/cc)
c (mmol/cc)
c (mmol/cc)
b (cc/mmol)
measurements: CH4 , CO2 , N2
N2
CO2
q (mmol/cc)
•Copper (ΙΙ) benzene-1,3,5tricarboxylate (Cu-BTC) has been synthesized
CH4
q (mmol/cc)
Figure 2. Crystal structure of Cu-BTC
Figure 1. Metal Organic Framework (MOF-5)
Materials and methods
•Synthesis: Cu-BTC synthesized in our laboratory
3.6 mmol
Cu(NO3)2.3H2O
dissolve in 12 ml deionized water
•Comparison of Cu-BTC with AC & Zeolite13X:
Mix solution 1 and 2
for 10 min
2.0 mmol Trimesic
acid
Filter the blue crystals
of Cu-BTC
CO2/N2
Transfer mixture
into 50ml Teflon
liner
Put in the autoclave and
heat at 393K for 12 h
Sample 1
Synthesized at 393K
N2
CO2
Intensity
CO2/CH4
dissolved in 12 ml
Ethanol
Synthesized at 453K
Sample 2
2θ
Sample1
2θ
Figure 3. X-ray diffraction (XRD) of Cu-BTC synthesized at two different temperatures
Conclusions and Future Works:
MOFs are promising materials for gas separation and storage
(a)
(b)
Lower temperature synthesis favors better crystalinity
Langmuir model fitts well to N2, CH4 and CO2 equilibrium data
Powder
Cu-BTC is good for CO2/N2 and CO2/CH4 separation
Cut into
small
pieces
Kinetic measurements of mentioned gases on Cu-BTC are in
progress
Pellet
Figure 5. (a) Scanning Electron Microscopy (SEM) of synthesized Cu-BTC and (b) Preparing
synthesized powder for adsorption experiments
Dose
chamber
Test
chamber
•Langmuir isotherm:
H2S and SO2 will come to the picture as Natural Gas
components in future measurements
References:
1.
Reference
Chamber
q
bC
=
qs 1 + b C
⇒ q=
b = b0e
Figure 6. Experimental Setup (Constant Volume)
−∆U
S. S.-Y. Chui et al.,
[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.
q s bc
Kc
=
1 + bc 1 + bc
H. Dathe, A. Jentys and J. A. Lercher, “Sulfate formation on SOx trapping materials studie
by 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
R gT
“A
chemically
functionalizable
nanoporous
material