NDLI: Deactivation mechanism of Ce/TiO<sub>2</sub> selective catalytic reduction catalysts by the loading of sodium and calcium salts

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Catalysis Science & Technology Vol - 3 Issue - 2

Catalysis Science & Technology Vol -2

Catalysis Science & Technology Vol -1

Deactivation mechanism of Ce/TiO₂ selective catalytic reduction catalysts by the loading of sodium and calcium salts

Content Provider	Royal Society of Chemistry (RSC)
Author	Gao, Shan Liu, Yue Weng, Xiaole Chen, Xiongbo Wang, Haiqiang Wu, Zhongbiao
Copyright Year	2013
Abstract	In this paper, the poisoning effect of alkali and alkaline earth metal on Ce/TiO2 catalysts was investigated for the first time and a deactivation mechanism was proposed. The Ce/TiO2 catalyst was observed to be deactivated seriously by the loading of Na+, K+ or Ca2+ ions. When the Na/Ce, K/Ce or Ca/Ce molar ratio exceeded 0.25, NO conversion of the Ce/TiO2 catalyst at 380 °C decreased from 78% to negligibly low. After subjecting it to a range of analytical techniques, including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), Raman spectra etc., it was found that amorphous ceria was dominant in the Ce/TiO2 sample, and would change to ceria crystals with the loading of Na+ or Ca2+ ions, leading to a poor dispersion of ceria on the surface of TiO2 as well as the transformation of Ce3+ to Ce4+. Both of these led directly to the disappearance of oxygen vacancies in the ceria particles, slowing down the reduction rate of ceria and hence decreasing its rate of oxidation/reduction recycle. We proposed that the enlargement of ceria nanoparticles, the reduced Ce4+/Ce3+ redox cycle rate and the change in the surface acidity could be the three major factors contributing to the decline of selective catalytic reduction (SCR) activity of the Ce/TiO2 catalyst after loading with Na+ or Ca2+ ions.
Starting Page	715
Ending Page	722
Page Count	8
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	3
Issue Number	3
Journal	Catalysis Science & Technology
DOI	10.1039/c2cy20568h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Oxygen Dispersion relation Cerium(IV) oxide Redox Alkali metal Alkaline earth metal Concentration Photoemission spectroscopy X-ray crystallography Transmission electron microscopy Raman Selective catalytic reduction X-ray photoelectron spectroscopy
Content Type	Text
Resource Type	Article
Subject	Catalysis

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