Transformation of intercalated layered silicates to zeolites in the solid state

Shimizu, Satoru; Kiyozumi, Yoshimichi; Maeda, Kazuyuki; Mizukami, Fujio; Pál-Borbély, G.; Mihályi, R.M.; Beyer, Hermann K.

doi:10.1002/adma.19960080913

Cited by 54 publications

(30 citation statements)

References 13 publications

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“…In 1996, Kiyozumi and co-workers introduced a solid-state method for the synthesis of silicalite-1 and silicalite-2 via the transformations of kanemite intercalated with tetrapropylammonium (kanemite-TPA) and tetrabutylammonium (kanemite-TBA) cations, respectively. [60][61][62] In comparison with the conventional synthesis of zeolites, the main advantages of this method are shorter crystallization time, smaller crystals and a convenient way to prepare binder-free pre-shaped zeolites in different forms ( pellets and discs). This method of preparation has been extended to the synthesis of various other zeolite types including Al-MFI, 63 Cu-and Co-silicalite-1, 64 and FER.…”

Section: Transformation Of Layered Silicates Into Zeolitesmentioning

confidence: 99%

Reactivity and applications of layered silicates and layered double hydroxides

2014

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Layered materials, such as layered sodium silicates and layered double hydroxides (LDHs), are well-known for their remarkable adsorption, intercalation and swelling properties. Their tunable interlayers offer an interesting avenue for the fabrication of pillared nanoporous materials, organic-inorganic hybrid materials and catalysts or catalyst supports. This perspective article provides a summary of the reactivity and applications of layered materials including aluminium-free layered sodium silicates (kanemite, ilerite (RUB-18 or octosilicate) and magadiite) and layered double hydroxides (LDHs). Recent developments in the use of layered sodium silicates as precursors for the preparation of various porous, functional and catalytic materials including zeolites, mesoporous materials, pillared layered silicates, organic-inorganic nanocomposites and synthesis of highly dispersed nanoparticles supported on silica are reviewed in detail. Along this perspective, we have attempted to illustrate the reactivity and transformational potential of LDHs in order to deduce the main differences and similarities between these two types of layered materials.

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Section: Transformation Of Layered Silicates Into Zeolitesmentioning

confidence: 99%

Reactivity and applications of layered silicates and layered double hydroxides

2014

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“…The crystallization of MWW phase was started after 1 d among amorphous phase. Amorphous phase was completely converted to MWW phase after two days, and the pure MWW was obtained after crystallization for 4 d. The amount of seeds was varied from 0.125 to 2.0 mass% against SiO 2 in the synthesis of MWW as in Table 2 (entries 20, [24][25][26][27][28], and the XRD patterns are shown in Fig. 4.…”

Section: Seeding On the Synthesis Of Mwwmentioning

confidence: 99%

“…13) New methods of zeolite synthesis, such as a dry-gel conversion (DGC) method and solid transformation have been well documented by some research groups. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] In comparison with the hydrothermal synthesis method, these new methods have the advantages such as expansion of the chemical compositions, the reduction of the structure directing agent (SDA) concentration, high conversion of the gel, fine particles with high crystallization, etc. Recently, Matsukata and his co-workers have successfully synthesized MWW by DGC method, and compared the morphologies of products synthesized by the DGC and HTS methods.…”

Section: Mcm-22 (Mww) Is a Family Of High Silica Zeolite Which Was Fmentioning

confidence: 99%

Seeding on the Synthesis of MCM-22 (MWW) Zeolite by Dry-Gel Conversion Method and its Catalytic Properties on the Skeleton Isomerization and the Cracking of Hexane

et al. 2005

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The effects of seeding on synthesis of MCM-22 (MWW) have been studied by the dry gel conversion (DGC) method. Highly reproducible crystalline MWW zeolite could be obtained by DGC method, using seeds of calcined sodium MWW with SiO 2 /Al 2 O 3 ¼ 31. Crystallization of MWW phase was completed in the presence of seeds (2 mass% against SiO 2 ) at 150 C within two days. The small amount of seed (0.25 mass% against SiO 2 ) was sufficient for the required phase formation of MWW. The MWW with SiO 2 /Al 2 O 3 ratio from 35 to 66 was obtained as pure phase; however, the crystallinity of MWW decreased with further increase in the ratio: products were contaminated with impurities.The catalytic properties of MWW were examined in the skeleton isomerization and the cracking of hexane, and compared to zeolites such as BEA, MFI, and MOR. The catalytic activities were in the order: MFI>BEA>MWW)MOR; however, the selectivity for the isomerization were in the order: BEA>MWW>MFI. These catalytic properties were due to the differences of structures and acid strength of zeolites.

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“…Shimizu et al have also proposed solid state zeolite transformation method. 58,59 We prepared molded binderless zeolite as follows. 60,61 Using the new solid-state crystallization (NSC) method, first, aluminum source, alkali, and SDA were impregnated into the molded silica support.…”

Section: Molecular Recognition Ability Of Zeolitementioning

confidence: 99%

Development of 2,2′-Iminodiethanol Selective Production Process Using Shape-Selective Pentasil-Type Zeolite Catalyst

Tsuneki¹,

Kirishiki²,

Oku³

2007

Bulletin of the Chemical Society of Japan

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Ethanolamines are produced on an industrial scale exclusively by the reaction of ethylene oxide with an aqueous solution of ammonia. The reaction is a typical consecutive reaction with three steps; therefore, it is difficult to produce 2,2 0 -iminodiethanol (the second product of the reaction) with high selectivity by conventional means. We developed a catalytic 2,2 0 -iminodiethanol selective production process using a pentasil-type zeolite catalyst modified with rare earth elements. This highly active catalyst was able to recognize the difference at molecular level between 2,2 0 -iminodiethanol and 2,2 0 ,2 00 -nitrilotriethanol; 2,2 0 ,2 00 -nitrilotriethanol was not formed in its micropore. We also succeeded in producing a binderless molded zeolite catalyst that does not form problematic impurities and that has a shape suitable for a fixed-bed reactor. The problem of activity deterioration was overcome by developing a regeneration process using high-temperature and high-density ammonia gas as a rinse medium.

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Transformation of intercalated layered silicates to zeolites in the solid state

Cited by 54 publications

References 13 publications

Reactivity and applications of layered silicates and layered double hydroxides

Reactivity and applications of layered silicates and layered double hydroxides

Seeding on the Synthesis of MCM-22 (MWW) Zeolite by Dry-Gel Conversion Method and its Catalytic Properties on the Skeleton Isomerization and the Cracking of Hexane

Development of 2,2′-Iminodiethanol Selective Production Process Using Shape-Selective Pentasil-Type Zeolite Catalyst

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