Journal
ENVIRONMENTAL TECHNOLOGY
Volume 37, Issue 7, Pages 828-836Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2015.1088070
Keywords
dilute acid/alkali solution; regeneration; SCR catalyst; activity; polymeric vanadate
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Funding
- programme of Innovation Team of the Bureau of Ningbo Science and Technology [2011B82003]
- Bureau of Science and Technology, Fujian Province, China [2015H0043]
- Chinese Academy of Sciences [XDB05050500]
- National Natural Science Foundation of China [21477095]
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The deactivation and regeneration of selective catalytic reduction catalysts which have been used for about 37,000 h in a coal power plant are studied. The formation of Al-2(SO4)(3), surface deposition of K, Mg and Ca are primary reasons for the deactivation of the studied Selective catalytic reduction catalysts. Other factors such as activated V valence alteration also contribute to the deactivation. Reactivation of used catalysts via environment-friendly and finance-feasibly approaches, that is, dilute acid or alkali solution washing, would be of great interest. Three regeneration pathways were studied in the present work, and dilute nitric acid or sodium hydroxide solution could remove most of the contaminants over the catalyst surface and partly recover the catalytic performance. Notably, the acid-alkali combination washing, namely, catalysts treated by dilute sodium hydroxide and nitric acid solutions orderly, was much more effective than single washing approach in recovering the activity, and NO conversion increased from 23.6% to 89.5% at 380 degrees C. The higher removal efficiency of contaminants, the lower dissolution of activated V, and promoting the formation of polymeric vanadate should be the main reason for recovery of the activity.
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