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Chemical solidification/stabilization of arsenic sulfide and oxide mixed wastes using elemental sulfur: Efficiencies, mechanisms and long-term stabilization enhancement by dicyclopentadiene
Kong, Linghao; Xia, Zhilin; Hu, Xingyun; Peng, Xianjia
2021-12-05
Source PublicationJOURNAL OF HAZARDOUS MATERIALS
ISSN0926-3373
Volume294Pages:-
AbstractThe control of nitrogen oxides (NOx) from heavy-duty diesel vehicles is becoming increasingly urgent due to its detrimental effects on the environment. Cu-SSZ-39, with its exceptional NH3-SCR activity and hydrothermal stability, has attracted more and more attention in the field of diesel vehicle emission control. In this work, an unexpected phenomenon was observed for Cu-SSZ-39 after hydrothermal aging. Generally, the hydrothermal aging process causes deterioration of the catalytic performance of catalysts. However, a remarkable increase in low-temperature NH3-SCR catalytic activity was observed in Cu-SSZ-39 after it was exposed to 850 degrees C hydrothermal aging conditions for 16 h. EPR, DRIFTS, H-2-TPR, UV-vis and XANES were utilized to detect the changes in Cu species. It was determined that a portion of the Cu2+ ions near double six-membered rings (d6r) transformed into CuxOy species after hydrothermal treatment. These CuxOy species facilitated the production of nitrate species which were critical intermediates in the NH3-SCR process, resulting in an increase in low-temperature catalytic activity.
Department环境水质学国家重点实验室
KeywordNOx reduction NH3-SCR Cu-SSZ-39 Hydrothermal aging CuxOy species
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/46842
Collection环境水质学国家重点实验室
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China
2.Chinese Acad Sci, Beijing Key Lab Ind Wastewater Treatment & Resour, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Kong, Linghao,Xia, Zhilin,Hu, Xingyun,et al. Chemical solidification/stabilization of arsenic sulfide and oxide mixed wastes using elemental sulfur: Efficiencies, mechanisms and long-term stabilization enhancement by dicyclopentadiene[J]. JOURNAL OF HAZARDOUS MATERIALS,2021,294:-.
APA Kong, Linghao,Xia, Zhilin,Hu, Xingyun,&Peng, Xianjia.(2021).Chemical solidification/stabilization of arsenic sulfide and oxide mixed wastes using elemental sulfur: Efficiencies, mechanisms and long-term stabilization enhancement by dicyclopentadiene.JOURNAL OF HAZARDOUS MATERIALS,294,-.
MLA Kong, Linghao,et al."Chemical solidification/stabilization of arsenic sulfide and oxide mixed wastes using elemental sulfur: Efficiencies, mechanisms and long-term stabilization enhancement by dicyclopentadiene".JOURNAL OF HAZARDOUS MATERIALS 294(2021):-.
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