Supporting information
for
Bauxite-supported Transition Metal Oxides: Promising
Low-temperature and SO2-tolerant Catalysts for Selective Catalytic
Reduction of NOx
Xiuyun Wang, WenWu, Zhilin Chen and Ruihu Wang*
Figure S1
N2 and N2O selectivities in SCR of NOx for Cu/bauxite.
1
Figure S2. Effect of inlet NO2/NOx ratio on SCR at different temperatures in Cu/bauxite.
Figure S3. TRM experiments of Cu/bauxite at 150 oC.
2
Figure S4 Stability test of Cu/bauxite with 10 vol % H2O at 200 oC.
Figure S5
H2-TPR profiles of bauxite and M/bauxite.
3
Figure S6. NOx-TPD profiles of bauxite and M/bauxite.
Figure S7. NH3-TPD profiles of bauxite and M/bauxite.
4
Table S1 Textural properties, (NO+NO2) and NH3 desorption in bauxite and
M/bauxite
Pore
radius
(nm)
Surface M
concentrationa
(%)
Total
acidityb
(μmol/g)
(NO+NO2)
Desorptionc
(μmol/g)
Total NH3
desorption
Samples
SBET
(m2/g)
Pore
Volume
(cm3/g)
Bauxite
194
0.257
2.66
-
0.49
13.93
(mmol/g)
0.93
Mn/bauxite
131
0.197
2.29
1.15
1.49
225.97
0.90
Ni/bauxite
130
0.194
2.36
1.72
3.80
405.16
1.67
Cu/bauxite
138
0.225
2.44
1.86
4.83
560.80
1.69
d
a XPS
results.
of Lewis acid to Brønsted acid at 200 oC.
cThe peak at 100-200 oC.
dThe peak at 50-400 oC.
bRatio
Table S2 The composition concentration of the post-treated bauxite
Element concentration (wt%)
bauxite
[Al]
[Fe]
[Ti]
[Ca]
[Pt]
[O]
[Si]
ω% ( ICP)
35.45
11.96
1.56
0.16
0.01
44.28
6.62
ω% ( ICP)a
Al2O3
Fe2O3
TiO2
CaO
Other
66.95
17.10
2.60
0.24
13.11
Al2O3
Fe2O3
TiO2
SiO2
Other
68.51
17.10
1.72
12.18
0.49
ω% ( XRF)
a The
values were normalized according to ICP results.
5
Table S3 NH3 storage capacity in M/bauxite and V2O5/TiO2.
NH3 storage capacitya
(mmol/g catalyst)
Sampl
es
50 oC
100 oC
150 oC
200 oC
Mn/bauxite
Ni/bauxite
Cu/bauxite
0.66
0.69
0.84
0.49
0.52
0.69
0.34
0.35
0.51
0.26
0.28
0.43
V2O5/TiO2
0.30
0.23
0.16
0.11
a1.21
μmol/g are injected in 45 min.
6