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The seed-assisted synthesis of ZSM-23 zeolite in the absence of alkali metal ions (denoted as SNNa) was investigated. Highly crystallized SNNa with needle-shape morphology and size of 500–1100 nm in length and 50–200 nm in diameter can be synthesized. Much attention was paid to the roles of alkali metal ions during the crystallization process. The absence of Na+ can effectively avoid the impurity-quartz...
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