Preparation and properties of primary leonhardite, (Na, K)-exchanged forms of laumontite

Atsushi Yamazaki, Takahiro Shiraki, Hironori Ishida, Ryohei Otsuka

研究成果: Article査読

抄録

(Na, K)-exchanged forms of laumontite, co-called “primary leonhardite”, can be prepared under hydrothermal conditions. The products show two steps of dehydration at about 180 and 240°C on TG-DTA curves, the same as previous reports about primary leonhardite. XRD data recorded under controlled relative-humidity suggest that the synthetic “primary leonhardite” maintains a similar framework structure to the fully hydrated phase of laumontite between 0 and 100% RH at 25°C. The number of water molecules varied from 13 to 17 per unit cell when replacing Ca by alkaline cations. The alkaline extra-framework cation sites of “primary leonhardite” are determined by Rietveld's method.

本文言語English
ページ(範囲)32-33
ページ数2
ジャーナルStudies in Surface Science and Catalysis
98
C
DOI
出版ステータスPublished - 1995 1 1

ASJC Scopus subject areas

  • 触媒
  • 凝縮系物理学
  • 物理化学および理論化学
  • 表面、皮膜および薄膜
  • 材料化学

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