CATALYTIC OXIDATION OF CO OVER CUXCE1-XO2-X/SBA-15/FECRAL
MONOLITHIC CATALYSTS
Fuzhen Zhao, Shengfu Ji*, Zhenfeng Li, Chengyue Li
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology,
Beijing 100029, China
* Corresponding author: Fax: +86-10-64419619, jisf@mail.buct.edu.cn
Recently, catalytic oxidation of CO has received much attention due to its importance in
pollution control derives for vehicle exhaust, indoor air cleaning, fuel cells, and minimizing
the CO build-up in CO2 lasers. Most of the conventional oxidation catalysts are noble metal or
transition metal oxide catalysts. These catalyst pellets made the fixed-bed reactors to have
high pressure drops and high gradient of temperature and thus depressed the activity of the
catalysts. Nowadays, novel monolithic structured catalysts, especially with the FeCrAl alloy
foils as the catalyst support, have increasingly drawn the attention of researchers. The
monolithic catalysts have distinct advantages such as the much lower pressure drops, the
lower capacity of mass and heat transfer and the higher resistance to thermal shocks. In this
study, a series of CuxCe1-xO2-x(x = 0-1)-based metal monolithic catalysts on supports made of
the FeCrAl alloy foils were prepared. The structure and the catalytic properties for CO
oxidation were investigated.
CO catalytic oxidation was performed in the cylinders monolithic reactor (i.d., 8 mm; length,
50 mm) at atmospheric pressure. The mixture gas was 1 vol.% CO in air. The phase structure
of the samples was characterized by X-ray powder diffraction (XRD) using a Rigaku D/Max
2500 VB2+/PC diffractometer with a Cu Ka radiation operating at 200 mA and 40 kV.
Temperature programmed reduction (TPR) experiments were performed using a Thermo
Electron Corporation TPD/R/O 1100 series catalytic surfaces analyzer equipped with a TCD
detector. The samples were preheated with 10%O2/He mixture heating 20oC/min up to 500 oC,
then cooling down to room temperature in flowing N2, and thereafter reduced with 5% H2/N2
mixture heating 20oC/min up to 1000oC.
The catalytic activity, XRD and H2-TPR results were presented from Fig. 1 to Fig. 3. It
was indicated that the CuxCe1-xO2-x/SBA-15/FeCrAl metallic monolithic catalysts have a good the
catalytic oxidation activity for CO.
100
▼
359
■
■
▼
299
▼
60%
60
40
50%
10%
20%
30%
40%
50%
60%
20
40%
★
Intensity(a.u.)
60%
Intensity(a.u.)
CO conversion (%)
306
▼
80
264
50%
303
30%
● ●
●
●
★●●
●
368
40%
342
20%
10%
●
351
30%
20%
390
a
10%
459
0
50
100
150
200
250
300
350
400
450
500
550
600
Temperature (℃)
Fig. 1. CO catalytic oxidation
over the Cu0.5Ce0.5O1.5/SBA-15/
FeCrAlcatalysts GHSV = 36000
ml/g·h.
20
40
2 theta (deg)
60
80
Fig. 2. XRD patterns of the
samples:
(a)
FeCrAl
foil
o
pre-oxidized at 950 C for 15 h
and x%Cu0.5Ce0.5O1.5/SBA-15/
FeCrAl
(★) FeCr; (▼) Ce1-xCuxO2-x;
(●) -Al2O3. (◆)CuO
200
400
600
Temperaturer/℃
800
1000
Fig. 3. TPR patterns of the
x%Cu0.5Ce0.5O1.5/SBA-15/FeCrAl
samples