期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 2, 页码 680-690出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta03519d
关键词
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资金
- Changjiang Scholar Incentive Program (Ministry of Education, China)
- National Natural Science Foundation of China [NSFC-1278458]
- National High Tech Research and Development Program (863) of China [2011AA060801]
- Technological research for public welfare of Zhejiang Province [2012C23024]
In this paper, ion-exchangeable titanate nanotubes were synthesized with a treatment of ethanol washing (referred to as TNTs-eth), which were utilized as supports for ceria (CeO2) catalysts. The resulting catalysts showed excellent resistance to alkali metal and alkaline earth metal poisoning in NH3-SCR applications, where the NO conversions could be maintained at 97%, 88% and 95% (at 350 degrees C) when Na+, K+ and Ca2+ were added, respectively. After the catalysts were subjected to a range of analyses, it was found that the resistance was mainly attributed to the significant increase in structural ion-exchangeable OH groups in the TNTs-eth catalyst, which led to a remarkable surface acid strength and abundant acid content, effectively neutralizing the basicity induced by the alkali metals and alkaline earth metals and retaining the SCR performance. Moreover, the repeatable Ce4+/Ce3+ redox cycles and the well-maintained nano-tubular structure also accounted for the excellent resistance performance of the Ce/TNTs-eth catalyst. We expect that the self-protection effect of the Ce/TNTs-eth catalyst (that was induced by its ion exchange ability) might provide a novel approach for the design and synthesis of SCR catalysts to relieve their alkali metal and alkaline earth metal poisoning.
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