Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 264, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118511
Keywords
Cu-SSZ-39; Cu-SSZ-13; NH3-SCR; Hydrothermal stability; Al distribution
Funding
- National Natural Science Foundation of China [21637005, 21906172, 51822811]
- K.C. Wong Education Foundation
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Catalysts Al-rich Cu-SSZ-39 and Cu-SSZ-13 are applied in ammonia selective catalytic reduction (NH3-SCR) reaction for NOx removal. Al-rich Cu-SSZ-39 maintained its excellent NH3-SCR activity even after hydrothermal aging at 850 degrees C for 16 h, whereas Al-rich Cu-SSZ-13 lost its deNOx activities completely when subjected to the same conditions. The main reason is that the active Cu2+ species are more stable in the structure of Cu-SSZ-39, because SSZ-39 zeolite contained more paired framework Al, leading to that Cu-SSZ-39 catalysts have more hydrothermally stable Cu2+-2Z species as compared to Cu-SSZ-13, and this makes Cu-SSZ-39 accumulate less CuOx during hydrothermal aging. In addition, the framework Al in SSZ-39 is more stable than that in SSZ-13, and a great amount of Cu2+-2Z species coordinated with paired framework Al in Cu-SSZ-39, which leaves fewer residual uncoordinated Al sites. Moreover, SSZ-39 has a more tortuous channel structure than SSZ-13 does. This inhibits the detached Al(OH)(3) from exiting the pores of the AEI zeolite framework, which would result in reincorporation of Al(OH)(3) into the framework when cooling down. Therefore, the Al-rich Cu-SSZ-39 with large amounts of stable paired Al shows a competitive potential candidate as an NH3-SCR catalyst for NOx elimination in practical applications.
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