Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 324, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2021.111271
Keywords
Cu-SSZ-13; Preparation; One-step ion-exchange; Hydrothermal stability
Categories
Funding
- National Key Research and Development Program [2019YFC0214305]
- National Natural Science Foundation of China [22006044]
- Scientific Research Funds of Huaqiao University [605-50Y20027]
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A one-step ion-exchange method was developed to prepare high-performance Cu-SSZ-13 from Na-SSZ-13 by adjusting the pH values of the Cu salt solution. The concentration of H+ significantly influences the loading and distribution of Cu, affecting both catalytic activity and hydrothermal stability.
A one-step ion-exchange method is developed to prepare high-performance Cu-SSZ-13 from Na-SSZ-13, by adjusting pH values of Cu salt solution during Cu-exchange. The H+ concentration has a significant influence on the Cu loading and distribution. In the absence of H+, the Cu2+ can only exchange the Na+ in 8 member rings (8MR) as Cu(OH)+, due to the steric hindrance of Na+ ions located in 6 member rings (6-MR). When H+ is present, it is found to compete with Cu2+ to exchange the Na+ and to occupy the exchange sites in Na-SSZ-13. The Cu2+ ions take a priority over H+ to occupy the neighboring Al sites in 6-MR, while H+ takes precedence over Cu2+ to occupy ion-exchange sites in 8-MR, causing that Cu2+ coordinated to 6-MR is dominant in Cu-SSZ-13 via one-step method. The H+ concentration affects the overall catalytic activity and hydrothermal stability by controlling the Cu2+ loading and distribution.
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