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The hydrolysis–polycondensation (HP) products of tetraethoxysilane (TEOS) in various pH media were introduced as silica sources in the synthesis of zeolite A nanocrystals. The synthesized sample had the minimum Si/Al ratio and crystal size when the HP process happened in the natural medium. With the increase of acidity or basicity of the HP process, both the Si/Al ratio and the crystal size of samples...
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