The influence of the pore structure on the SO2 tolerance for selective catalytic reduction of NOx with NH3 over MnOx-TiO2/MWCNTs catalysts

The MnO x -TiO 2 /MWCNTs nanocomposites were used as De-NO x catalysts to study the deep-rooted reason for the deactivation. Based on a series of characterization on as-prepared catalyst and poisoned catalyst, the results showed that the chief culprit for the deactivation is the micropores in the De...

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Published in:Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology 2019-04, Vol.21 (4), p.1-7, Article 75
Main Authors: Xie, Chong, Shi, Jian-Wen, Yang, Shenghui, Li, Xifei
Format: Article
Language:English
Subjects:
Ammonia
Ammonium
Catalysis
Catalysts
Characterization and Evaluation of Materials
Chemistry and Materials Science
Deactivation
Gas flow
Heat treatment
Inorganic Chemistry
Lasers
Materials Science
Nanocomposites
Nanoparticles
Nanotechnology
Nitrogen oxides
Optical Devices
Optics
Phase transitions
Photonics
Physical Chemistry
Porosity
Research Paper
Selective catalytic reduction
Sulfates
Sulfur dioxide
Titanium dioxide
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Summary:The MnO x -TiO 2 /MWCNTs nanocomposites were used as De-NO x catalysts to study the deep-rooted reason for the deactivation. Based on a series of characterization on as-prepared catalyst and poisoned catalyst, the results showed that the chief culprit for the deactivation is the micropores in the De-NO x catalyst. The formed ammonium (bi)sulfate in the micropores during the SCR reaction process could not be took away by the gas flow soon and then deposited on the catalyst surface gradually, and further covered the active sites. And the poisoned catalysts could be recovered partly rather than fully by heat treatment at 500 °C because of the decomposition of the ammonium (bi)sulfate and the phase transition of the TiO 2 .
ISSN:1388-0764
1572-896X
DOI:10.1007/s11051-019-4519-0