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Acta Physico-Chimica Sinca  2015, Vol. 31 Issue (12): 2358-2365    DOI: 10.3866/PKU.WHXB201510135
CATALYSIS AND SURFACE SCIENCE     
Influence of La on CeO2-ZrO2 Catalyst for Oxidation of Soluble Organic Fraction from Diesel Exhaust
Yi. YANG1,Zheng-Zheng. YANG2,Hai-Di. XU3,*(),Bao-Qiang. XU1,Yan-Hua. ZHANG1,Mao-Chu. GONG1,Yao-Qiang. CHEN1,*()
1 Key Laboratory of Green Chemistry & Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
2 College of Architecture and Environment, Sichuan University, Chengdu 610064, P. R. China
3 Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610064, P. R. China
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Abstract  

CeO2-ZrO2 and CeO2-ZrO2-La2O3 catalysts with mass ratios of 60:40 and 60:30:10 were prepared by co-precipitation method, respectively. The catalytic activity in oxidation of the soluble organic fraction (SOF) in diesel exhausts was studied using thermogravimetric-differential thermal analysis (TGDTA). The results indicate that the catalytic activity of the La-modified CeO2-ZrO2 catalyst is better than that of the CeO2-ZrO2 catalyst; the light-off temperature of SOF is 164 ℃, and the weightlessness fastest point temperature is 212 ℃, whereas for CeO2-ZrO2, these temperatures are 168 and 221 ℃, respectively. X-ray diffraction (XRD) shows that modification with La is beneficial to decrease the growth rate of the crystallite size relative to that of CeO2-ZrO2 after high-temperature ageing. N2 adsorption-desorption results suggest that the addition of La enlarges the surface area. O2-temperature-programmed desorption (O2-TPD) and X-ray photoelectron spectroscopy (XPS) show that modification with La increases the amount of chemisorbed oxygen on the CeO2-ZrO2 catalyst. The CeO2-ZrO2-La2O3 catalyst shows better activity and ageing resistance than the CeO2-ZrO2 catalyst.



Key wordsCeO2-ZrO2      La-modified CeO2-ZrO2      Soluble organic fraction      Diesel oxidation catalyst      Chemisorbed oxygen     
Received: 31 July 2015      Published: 13 October 2015
MSC2000:  O643  
Fund:  the National Natural Science Foundation of China(21173153);National High-Tech Research and DevelopmentProgram of China (863)(2013AA065304)
Corresponding Authors: Hai-Di. XU,Yao-Qiang. CHEN     E-mail: xuhaidi@scu.edu.cn;nic7501@scu.edu.cn
Cite this article:

Yi. YANG,Zheng-Zheng. YANG,Hai-Di. XU,Bao-Qiang. XU,Yan-Hua. ZHANG,Mao-Chu. GONG,Yao-Qiang. CHEN. Influence of La on CeO2-ZrO2 Catalyst for Oxidation of Soluble Organic Fraction from Diesel Exhaust. Acta Physico-Chimica Sinca, 2015, 31(12): 2358-2365.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201510135     OR     http://www.whxb.pku.edu.cn/Y2015/V31/I12/2358

 
Catalyst Tla/℃ Tmb/℃ ΔTc Ad/(μV·℃·mg–1·mg–1)
lube 230 298 68
f-CeO2-ZrO2 168 221 53 104.42
f-CeO2-ZrO2-La2O3 164 212 48 119.62
a-CeO2-ZrO2 186 252 66 107.45
a-CeO2-ZrO2-La2O3 174 231 57 122.28
 
Catalyst Surface area/(m2·g–1) Pore volume/(mL·g–1) Pore radius/nm Crystallite size/nm Lattice constant/nm
f-CeO2-ZrO2 106 0.25 4.86 5.5 0.5257
f-CeO2-ZrO2-La2O3 128 0.23 3.56 4.4 0.5322
a-CeO2-ZrO2 50 0.22 8.87 8.9 0.5282
a-CeO2-ZrO2-La2O3 61 0.21 6.75 5.9 0.5337
 
 
 
 
 
Catalyst Ratio/%
Ce3+ in Ce Oβ in O
f-CeO2-ZrO2 24.15 31.8
f-CeO2-ZrO2-La2O3 25.11 41.4
a-CeO2-ZrO2 21.99 28.9
a-CeO2-ZrO2-La2O3 23.16 35.9
 
 
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