Abstract
The small-pore KFI-type zeolite was synthesized via the hydrothermal conversion of zeolite Y with Na+ and K+ ions without using an organic structure-directing agent (OSDA). The effects of alkali-metal ions and hydroxide ion on the crystallization of KFI were individually investigated by introducing both hydroxide and nitrate salts into synthesis media. The zeolite KFI synthesized under the optimized conditions was copper ion exchanged and then applied for selective catalytic reduction of NOx with an NH3 (NH3-SCR) reaction. Cu-KFI was found to exclusively contain isolated copper ions up to very high loading (Cu/Al2 = 75%) on the basis of the Cu K-edge extended X-ray absorption fine structure (EXAFS), X-ray absorption near-edge structure (XANES), ultraviolet visible near-infrared spectroscopy (UV–vis–NIR), and temperature-programmed reduction by H2 (H2-TPR) analyses. Interestingly, Cu-SSZ-13 and Cu-KFI have almost identical activation energies for the NH3-SCR reaction as well as the reduction temperature of...
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