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Rare earth ions (La, Nd, Sm, Gd, and Tm) regulate the catalytic performance of CeO2/Al2O3 for NH3-SCR of NO

Published online by Cambridge University Press:  17 April 2017

Qijie Jin ,
Yuesong Shen ,
Shemin Zhu ,
Huiyuan Li  and
Yanbao Li
Qijie Jin
Affiliation:
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China; Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 210009, China; and Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, Nanjing 210009, China
Yuesong Shen*
Affiliation:
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China; Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 210009, China; and Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, Nanjing 210009, China
Shemin Zhu*
Affiliation:
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China; Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 210009, China; and Shandong Gemsky Environmental Technology Co, Zibo 255086, China
Huiyuan Li
Affiliation:
Shandong Gemsky Environmental Technology Co, Zibo 255086, China
Yanbao Li
Affiliation:
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China
*
a) Address all correspondence to these authors. e-mail: sys-njut@163.com
b) e-mail: szsm313@163.com
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Abstract

A series CeO2/Al2O3 catalysts was modified with rare earth element (La, Nd, Sm, Gd, and Tm) using extrusion method. The catalytic activities of the obtained catalysts were measured for the selective catalytic reduction (SCR) of NO with NH3 to screen suitable addition of rare earth element. These samples were characterized by X-ray diffraction (XRD), N2 adsorption (N2-BET), NH3 temperature-programmed desorption analyses (NH3-TPD), H2 temperature-programmed reduction (H2-TPR), Raman spectra, pyridine adsorption Fourier-transform infrared (Py-IR) and X-ray photoelectron spectroscopy (XPS), respectively. Results showed that the CeO2/Al2O3 exhibited excellent performance in resisting reactant poisoning caused by vapor and sulfur and the highest catalytic activity (98.35%) at 360 °C when the added Tm/Ce molar ratio is 0.10. The surface acidity of CeO2/Al2O3 catalyst would be enhanced with the addition of rare earth ions. Consequently, rare earth ion was beneficial to catalytic activity at low temperatures and corresponded to similar law. Analysis revealed that the higher number of acid sites and the more Ce3+ were conductive to obtain the excellent NH3-SCR activity.

Keywords

CeO2/Al2O3nitrogen oxideacid sitesselective catalytic reductionrare earth element
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 12 , 28 June 2017 , pp. 2438 - 2445
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

c)

These authors contributed equally to this work.

Contributing Editor: Chongmin Wang

References

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