Journal ArticleDOI
Dissolution of high-silica zeolites in alkaline solutions II. Dissolution of ‘activated’ silicalite-1 and ZSM-5 with different aluminum content
Ankica Čimek,Boris Subotić,Ivan Šmit,Antun Tonejc,Rosario Aiello,Fortunato Crea,Alfonso Nastro +6 more
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TLDR
In this article, the process of dissolution of organic-free high-silica pentasils (silicalite-1 and ZSM-5 with different Al-content) was investigated by different methods such as X-ray diffractometry, Fourier transform infrared spectroscopy (FTIR), scanning-electron microscopy (SEM) and measuring the silicon and aluminum concentration in the liquid phase.About:
This article is published in Microporous Materials.The article was published on 1995-06-01. It has received 119 citations till now. The article focuses on the topics: Dissolution & Sodium silicate.read more
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Hierarchical zeolites: enhanced utilisation of microporous crystals in catalysis by advances in materials design.
Javier Pérez-Ramírez,Claus H. Christensen,Kresten Egeblad,Christina Hviid Christensen,Johan C. Groen +4 more
TL;DR: This critical review examines recent advances in the rapidly evolving area of zeolite with improved accessibility and molecular transport and particularly dwells on the exciting field of hierarchical zeolites, which couple in a single material the catalytic power of micropores and the facilitated access and improved transport consequence of a complementary mesopore network.
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The hydrothermal synthesis of zeolites: precursors, intermediates and reaction mechanism
Colin S. Cundy,Paul A. Cox +1 more
TL;DR: An account of the mechanistic aspects of hydrothermal zeolite synthesis can be found in this paper, where a review of the most probable mechanistic pathways in Zeolite formation is given.
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Synthesis strategies in the search for hierarchical zeolites
TL;DR: The overall one is the development of methods that are versatile in terms of zeolite structures and compositions, capable of tuning the secondary porosity properties, and being scaled up in a cost-effective way.
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Design of hierarchical zeolite catalysts by desilication
TL;DR: Hierarchical (or mesoporous) zeolites have received an everincreasing attention due to their improved performance in catalysed reactions with respect to conventional (purely microporous) Zeolites as discussed by the authors.
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Desilication: on the controlled generation of mesoporosity in MFI zeolites
TL;DR: In this paper, an optimal molar Si/Al ratio in the range of 25-50 has been identified for mesoporous ZSM-5 zeolites with preserved structural integrity, and a successive combination of post-treatments, in which desilication is followed by dealumination, enables a decoupled modification of the mesopore and acidic properties.
References
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X-ray diffraction procedures for polycrystalline and amorphous materials
Harold P. Klug,Leroy Alexander +1 more
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Properties of the end members in the Pentasil-family of zeolites: characterization as adsorbents
TL;DR: In this paper, domestic synthesized HZSM-5 and HSZM-11 zeolites were shown to have the same crystal morphology and unit cell dimensions as the Mobil materials.
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Zoned aluminium distribution in synthetic zeolite ZSM-5
R. von Ballmoos,W. M. Meier +1 more
TL;DR: In this article, the authors present substantial evidence that the Al distribution in ZSM-5 crystals is non-uniform, showing that Al is invariably concentrated in the rim portion of the crystals.