メタカオリンを出発物質としたLi含有ゼオライトの合成

概要

論文の詳細を見る
Substances containing Li-EDI and Li-ABW zeolites were synthesized by the reaction of a mixture of metakaolin and LiOH solution at 20-90℃ for 5-168h. The zeolites could be synthesized using a LiOH solution with a Li composition almost stoichiometric to the Si and Al in metakaolin. Li-EDI and Li-ABW zeolites were dominantly synthesized in lower and higher temperature ranges, respectively. The Li-EDI zeolite synthesized from metakaolin showed a cubic or cross-topology form resulting from its columnar particles. Conversely, the Li-ABW zeolite synthesized from metakaolin had much smaller particles than that synthesized from reagents, and was observed in the form of secondary aggregation particles. In samples synthesized from a mixed suspension of metakaolin and high-concentration LiOH solution (about four times as dense as the stoichiometric composition), less zeolite was produced, but a Li-containing amorphous substance was also generated. Solidstate NMR revealed Q^4 (4Al)-Si and tetracoordinate Al, indicating that it was an amorphous aluminosilicate with a zeolite-like network structure.
2011-08-10