Syntheses of Bulky Y-Zeolite by Hydrothermal Hot-Pressing (HHP) Technique

Abstract

Synthesis of bulky Y-zeolite was attempted by a hydrothermal hot-pressing (HHP) method. These bulky products synthesized under hydrothermal conditions were identified as Y-zeolite single phase. Especially, bulky Y-zeolite having translucency, high density and large surface area was obtained by HHP treatment at 423K for 2h with 17wt% of 5M-NaOH solution. This solidified zeolite like single-crystal was considered to be made by dissolution and precipitation mechanism. High-density bulky zeolites can be expected as novel molecular sieves and catalysts with high activity.

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“…Nevertheless, dense hydroxyapatite ceramics were obtained by hydrothermal hot-pressing, but promoting hydrothermal reactions through the incorporation of precursor compounds [10]. Zeolite compounds were sintered by hydrothermal hot-pressing containing 17 wt.% of water with different amounts of NaOH (final molar solutions of 0.1 -10M) [11], suggesting dissolution and precipitation as the consolidation mechanism.…”