巻号一覧
37 巻 (1997 - 1998)
- 4 号 p. 137-
- 3 号 p. 87-
- 2 号 p. 37-
- 1 号 p. 1-
37 巻, 3 号
選択された号の論文の4件中1～4を表示しています
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歌田 実1997 年 37 巻 3 号 p. 87-94
発行日: 1997/12/25
公開日: 2011/09/20
ジャーナル フリーThe mineral group of natural zeolites is composed of 47 species which have specific crystal structure and specific chemical composition. The mode of occurrence of natural zeolites can be classified into three groups. Among them, zeolites replacing volcanic glasses often occupy a large portion of rocks and form “zeolite rocks”. They are grouped into several mineralogical zones, according to mineral assemblage of zeolite-clay mineral-silica mineral. Zeolite rocks are mainly formed by burial diagenesis-low grade metamorphism, diagenesis in alkali saline lake (closed system), weathering in open system, and hydrothermal alteration. Burial diagenesis-low grade metamorphism is mainly controlled by temperature, whereas next two genetical types are controlled by chemistry of reacting solutions. Hydrothermal alteration is affected by both temperature and chemistry of hydrothermal solutions. Thus, natural zeolites of each genetic type are formed under different conditions.
At present, quantitative data on formation temperature and chemistry of reacting solutions are rare except saline and hydrothermal solutions. Formation temperature in diagenesis may be effectively obtained from bore-hole temperature, if diagenesis is progressive.抄録全体を表示PDF形式でダウンロード (913K) -
板橋 慶治1997 年 37 巻 3 号 p. 95-104
発行日: 1997/12/25
公開日: 2011/09/20
ジャーナル フリーThere are many kinds of siliceous zeolites with SiO2/Al2O3≥10 synthesized by using organic templates. Some types of siliceous zeolites like MFI, MOR, FER and HEU can be synthesized without organic templates and they are used mainly as adsorbents and catalysts. Crystallization method and conditions controlling the crystalline properties of these siliceous zeolites are described.
The results of formation mechanism of zeolitic framework, and the correlation between the aluminosilicate molecules in the reactant mixture of zeolite synthesis and the pseudo-aluminosilicate molecules in the framework of zeolite are presented.
Distribution of Al atoms in the zeolitic framework affect not only its physicochemical properties but also its adsorptive and catalytic properties. The determination method of Al atoms in MOR type zeolite is briefly shown, and the newly founded rule known as “2A1/5-ring avoidance rule” complementing the Loewenstein's rule is also explained.抄録全体を表示PDF形式でダウンロード (954K) -
佐藤 悌治1997 年 37 巻 3 号 p. 105-111
発行日: 1997/12/25
公開日: 2011/09/20
ジャーナル フリーGeneration and morphology of clay minerals in the natural world have been imitated by many research workers, and a number of the syntheses thereof by a variety of ways or techniques were attempted by them. Recent years advancement on clay researches and experimentations have discovered the syntheses of smectite, mica and kaolinite in industrial scale.
A kind of 1: 1-type tri-subgroup clay minerals was synthesized by the present author et al. It is called fraipontite. It has a two-layers structure similar to kaolinite, but being scarcely known to the general public as compared with kaolinite. Al-lizardite having a structure similar to fraipontite can be synthesized in the same manner, however, in case of fraipontite Mg is substituted by Zn in its structural composition.
Fraipontite is easily synthesized by hydrothermal or coprecipitation reaction, and has both properties of solid acid and base from its chemical composition and structure. In order to display such characteristic properties as much as possible, the present author et al intended to make the microcrystals of fraipontite monodispersed and porous by compositing with silica gel. As a result of this method, the synthesis and the composite technology of fraipontite as a kind of 1: 1-type trisubgroup clay minerals have been closely tied in with the applications as an excellent amphoteric adsorbent.抄録全体を表示PDF形式でダウンロード (8297K) -
古沢 隆資1997 年 37 巻 3 号 p. 112-117
発行日: 1997/12/25
公開日: 2011/09/20
ジャーナル フリーCO-OP Chemical Co. LTD has commercialized synthetic smectite and micas. Synthetic smectite (SW) has been produced as very fine particle using hydrothermal synthesis method under relatively low pressure and temperature. Synthetic micas have been produced by the intercalation method developed originally using the mixture of talc and silicofluoride, and by two kinds of synthetic ways, one was formed as expandable mica ‘ME’ from Na2SiF6 and the other one was formed as non-expandable mica ‘MK’ from K2SiF6. These synthetic smectite and micas have common character properties like high whiteness, high purity and high heat-resistance. These products are of good quality with uniform physical and chemical properties. Possible control of properties by variation of synthesis condition is also achievable. Because of excellent expandable nature of these materials, organic and inorganic materials with molecular size can be intercalated into the interlayer sites of SW and ME, which make the organic and inorganic complexes suitable for industrial applications.抄録全体を表示PDF形式でダウンロード (594K)
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