Volume 50 Issue 11
Nov.  2022
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LÜ Wen-ting, JIAO Wei-yong, QIN Zhang-feng, DONG Mei, FAN Wei-bin, WANG Jian-guo. Effect of preparation conditions on the morphology of Cu-SSZ-13 zeolites and their performance in the selective catalytic reduction of NOx by NH3[J]. Journal of Fuel Chemistry and Technology, 2022, 50(11): 1393-1403. doi: 10.19906/j.cnki.JFCT.2022038
Citation: LÜ Wen-ting, JIAO Wei-yong, QIN Zhang-feng, DONG Mei, FAN Wei-bin, WANG Jian-guo. Effect of preparation conditions on the morphology of Cu-SSZ-13 zeolites and their performance in the selective catalytic reduction of NOx by NH3[J]. Journal of Fuel Chemistry and Technology, 2022, 50(11): 1393-1403. doi: 10.19906/j.cnki.JFCT.2022038

Effect of preparation conditions on the morphology of Cu-SSZ-13 zeolites and their performance in the selective catalytic reduction of NOx by NH3

doi: 10.19906/j.cnki.JFCT.2022038
Funds:  The project was supported by Basic Research Program Youth Project of Shanxi Province (20210302123263), the Independent Research Project of State Key Laboratory of Coal Conversion (2021BWZ009), National Natural Science Foundation of China (21875275, U1910203, 21991092, 21991090), and the Natural Science Foundation of Shanxi Province of China (201901D211581)
  • Received Date: 2022-03-28
  • Accepted Date: 2022-05-06
  • Rev Recd Date: 2022-05-03
  • Available Online: 2022-05-12
  • Publish Date: 2022-11-30
  • SSZ-13 zeolites were synthesized by conventional hydrothermal method and the Cu-SSZ-13 zeolite catalysts were then prepared by Cu ion-exchange and used in the selective catalytic reduction of NOx with NH3 (NH3-SCR); the effect of various preparation parameters including the organic template agent (OSDA) dosage, silicon source, aluminum source, H2O/Si ratio, Si/Al ratio and aging time on the morphology, crystal size, acidity, state of Cu2+ sites and the catalytic performance of Cu-SSZ-13 in NH3-SCR were investigated. The results indicate that silica sol (JN25) and Al2(SO4)3 are appropriate as the silicon and aluminum sources, respectively, to prepare SSZ-13 zeolites with small crystals, high crystallinity and high activity in NH3-SCR. With the increase of Si/Al ratio, the crystal size of SSZ-13 increases and the copper content loaded on Cu-SSZ-13 decreases, leading to the degradation of NH3-SCR activity. A high H2O/Si ratio of 88 is conducive to forming larger SSZ-13 crystals, whilst increasing the OSDA dosage is beneficial to improving the crystallinity, reducing the crystal size, and accordingly enhancing the catalytic activity of Cu-SSZ-13 in NH3-SCR. In addition, a relatively longer aging time can also reduce the crystal size and raise the catalytic activity of Cu-SSZ-13. In particular, the Cu-SZ13-A10 zeolite catalyst synthesized with a Si/Al ratio of 10 (with the gel composition of 1SiO2 : 0.01Al2(SO4)3 : 0.3NaOH : 0.4SDA : 88H2O; JN25 as silicon source and aging for 2 h) exhibits high activity in NH3-SCR; under a high GHSV of 240000 h−1, the NO conversion reaches 60% at 200 ℃ and keeps at 100% in the moderate-high temperature range. These results should be useful for the regulation of SSZ-13 zeolite morphology and the preparation of high efficient Cu-SSZ-13 catalysts for NH3-SCR.
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