Preparation of amino Preparation of amino- functionalized mesoporous silica functionalized ...

18 Pages·2015·4.14 MB·English

3rd Post Carbon Capture conference, Regina, Canada
PPrreeppaarraattiioonn ooff aammiinnoo-
ffuunnccttiioonnaalliizzeedd mmeessooppoorroouuss ssiilliiccaa
and its apppplication for CO ppost-
22
combustion capture
Mohammad R.M. Abu Zahra (PhD)
Dang Viet Quang (PhD)
Institute Center for Energy-
iiEEnneerrggyy
Saturday, September 12, 2015
1
CO post combustion capture
2
CCoonnvveennttiioonnaall pprroocceessss ((aaqq. MMEEAA 3300%%))
 MMoosstt mmaattuurree tteecchhnnoollooggyy
 Higgh reggeneration energgyy
 Highly thermal and oxidative degradation
 Highly corrosive
→ Cost of electricity increases ≈ 80%
2
CO post combustion capture
2
 PPootteennttiiaall ooff ssoolliidd aaddssoorrbbeenntt
 HHiigghheerr aaddssoorrppttiioonn ccaappaacciittyy
 Lower reggeneration energgyy
 Lower cost of adsorbent
 Most promising: Amine functionalized
porous silica
3
What is porous silica?
SSooll Gel ppoowwddeerr
PPrriimmaarryy ppaarrttiicclleess PPoorreess
SBA-15 MCM-41
Ordered pporous silica FFiibbrroouuss ssiilliiccaa DDiissoorrddeerreedd ppoorroouuss ssiilliiccaa
4
Precipitated silica (PS)
Synthetic route
Na O·n SiO + H SO + (2n-1)H O → nSi(OH) + Na SO
2 2 2 4 2 4 2 4
nSi(OH) → Si O- (OH) + H O
4 n (4n-nx)/2 nx 2
Propperties
Parameter Value
SSuurrffaaccee aarreeaa ((mm2//gg)) 110000‐880000
Pore volume (cm3/g) 0.5‐2
Pore size (nm) 10‐30
Porosity (%) 60‐90
Bulk density (g/cm3) 0.1‐0.4
LLooww ccoosstt:: ≈≈$$11//kkgg
Oil adsorption (mL/g) 100‐350
Saturday, September 12, 2015 5
Sorbent preparation
 Amine impregnation
Amine imppreggnation
(PEI, AMP, DEA...)
SSiilliiccaa ssuubbssttrraatteess SSoolliidd aaddssoorrbbeenntt
Amines are filled into the pores of silica
6
Amino-functionalized silica
 Amine grafting
Amino functional groups are chemically attached to
ssiilliiccaa ssuubbssttrraattee
7
Amino-functionalized silica
 Amine impregnation - grafting
Amine imppreggnation
3-Aminopropyltriethoxy
silane (3-APTES)
SSiilliiccaa ssuubbssttrraatteess SSoolliidd aaddssoorrbbeenntt
APTES is filled into the pores of silica, then
hhyyddrroollyyzzeedd aanndd ggrraafftteedd oonn ssiilliiccaa
8
Results
N adsorption/desorption isotherm
2
00.55
140
300
0.4 120
Pore volume
250 Mesoporous silica
BET surface area
g) PS-40 amine
3/m/ PS-50 amine 100 B
c 200 E
d ( PS-60 amine 3) 0.3 T
e m
b s
or 150 (c 80 ur
n abs ume 0.2 face
gerog 110000 lvol 6600 aare
Nit 50 ore 40 a (m
P
0.1 2
/
g
)
0
20
0.0 0.2 0.4 0.6 0.8 1.0
0.0
Relative pressure (P/P) 0
0
0 20 40 60 80
IImmppggrreennaatteedd ccoonncceennttrraattiioonn ((wwtt%%))
Porosity and surface area reduced with
impregnation of amine
9
Results
AA BB
SEM images of silica (A) and adsorbent (B)
PPoorreess ooff mmeessooppoorroouuss ssiilliiccaa wweerree ffuunnccttiioonnaalliizzeedd
with amine
10