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	Influence of phosphorus on the NH3-SCR performance of CeO2-TiO2 catalyst for NOx removal from co-incineration flue gas of domestic waste and municipal sludge
	Cao, Jun1; Rohani, Sohrab3; Liu, Weizao1; Liu, Honghui4; Lu, Zhuquan1; Wu, Hongli1; Jiang, Lijun1; Kong, Ming1; Liu, Qingcai1; Yao, Xiaojiang2,5
	2022-03-15
摘要	Domestic waste and municipal sludge are two major solid hazardous substances generated from human daily life. Co-incineration technology is regarded as an effective method for the treatment of them. However, the emitted NOx-containing exhaust with high content of phosphorus should purified strictly. CeO2-TiO2 is a promising catalyst for removal of NOx by NH3-SCR technology, but the effect of phosphorous in the exhaust is ambiguous. Therefore, the effect of phosphorus on NH3-SCR performance and physicochemical properties of CeO2-TiO2 catalyst was investigated in our present work. It was found that phosphorus decreased the NH3-SCR activity below 300 degrees C. Interestingly, it suppressed the formation of NOx and N2O caused by NH3 over-oxidation above 300 degrees C. The reason might be that phosphorus induced Ti-4. to migrate from CeO2-TiO2 solid solution and form crystalline TiO2, which led to the destruction of TiO-Ce structure in the catalyst. So, the transfer of electrons between Ti and Ce ions, the relative contents of Ce3+, and surface adsorbed oxygen, as well as the redox performance were limited, which further inhibited the over-oxidation of NH3. In addition, phosphorus weakened the NH3 adsorption on Lewis acid sites and the adsorption performance of NO + O-2, while increased the Bronsted acid sites. Finally, the reaction mechanism over CeO2-TiO2 catalyst did not change after introducing phosphorus, L-H and E-R mechanisms co-existed on the surface of the catalysts. (C) 2021 Elsevier Inc. All rights reserved.
关键词	CeO2-TiO2 Phosphorus Over-oxidation of NH3 Reaction pathway NH3-SCR
DOI	10.1016/j.jcis.2021.11.013
发表期刊	JOURNAL OF COLLOID AND INTERFACE SCIENCE
ISSN	0021-9797
卷号	610页码:463-473
通讯作者	Liu, Weizao(liuwz@cqu.edu.cn) ; Liu, Qingcai(liu_qingcai@163.com) ; Yao, Xiaojiang(yaoxj@cigit.ac.cn)
收录类别	SCI
WOS记录号	WOS:000772009700007
语种	英语