Journal ArticleDOI
Preparation of ferrisilicate ZSM-5 molecular sieves
R. Szostak,T.L. Thomas +1 more
TLDR
In this article, the ferrisilicate molecular sieve analog of the zeolite ZSM-5 can be obtained from a gels containing low-molecular-weight silica species.About:
This article is published in Journal of Catalysis.The article was published on 1986-08-01. It has received 115 citations till now. The article focuses on the topics: Molecular sieve & Zeolite.read more
Citations
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Journal ArticleDOI
Reactivity of Surface Species in Heterogeneous Catalysts Probed by In Situ X-ray Absorption Techniques
TL;DR: (Article begins on next page)
Journal ArticleDOI
Ferrisilicate analogs of zeolites
Paul Ratnasamy,Rajiv Kumar +1 more
TL;DR: In this article, a review of ferrisilicate analogs of zeolites is presented, most of them belonging to the medium (10-ring) and large pore systems.
Journal ArticleDOI
Evolution of Extraframework Iron Species in Fe Silicalite: 1. Effect of Fe Content, Activation Temperature, and Interaction with Redox Agents
Gloria Berlier,Giuseppe Spoto,Silvia Bordiga,Gabriele Ricchiardi,P. Fisicaro,Adriano Zecchina,Ilenia Rossetti,Elena Selli,L. Forni,Elio Giamello,Carlo Lamberti +10 more
TL;DR: In this article, a study was made of the iron species dislodged from the tetrahedral lattice position by thermal treatments in four Fe silicalite samples with Si/Fe ratios of 25, 50, 90, and 150.
Journal ArticleDOI
Neutron powder diffraction study of orthorhombic and monoclinic defective silicalite
TL;DR: The detected long-range order of adjacent Si atoms in defective orthorhombic [MFI] structures is compatible with a mechanism of Si vacancy clustering and with the model of hydroxyl nests assumed in the literature on the basis of IR spectroscopic evidence.
Journal ArticleDOI
A Mössbauer study of ZSM-5-type ferrisilicates
A. Meagher,V. Nair,R. Szostak +2 more
TL;DR: In this paper, the authors used 57 Fe Mossbauer spectroscopy to study the ZSM-5-type structure of a tetrahedral Fe(III) and showed that > 90% of the iron in these samples is in the framework sites.
References
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Journal ArticleDOI
Isomorphous substitution in zeolite frameworks. 1. Acidity of surface hydroxyls in [B]-, [Fe]-, [Ga]-, and [Al]-ZSM-5
TL;DR: A series of isomorphously framework-substituted ZSM-5 zeolites has been characterized by Fourier transform infrared spectroscopy, with primary focus on the nu(OH) region, and by temperature programmed NH3 desorption as discussed by the authors.
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EPR study of the nature and removal of iron(III) impurities in ammonium-exchanged NaY-zeolite
TL;DR: In this paper, a chemical extraction procedure was proposed to purify commercial synthetic zeolites without altering their crystallographic structure. But this method requires the removal of precipitated iron and Fe 3+ counterions from the zeolite.
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Studies of the deammoniation and dehydroxylation processes in NH4 faujasite and NH4 mordenite zeolites. The use of the ESR of framework-substituted Fe3+ as a probe
B.D. McNicol,G.T. Pott +1 more
TL;DR: In this article, a broad ESR signal upon deammoniation and dehydroxylation of the NH4 forms of both zeolites in vacuum parallels a decrease in intensity of the normal paramagnetic Fe3+ ESR signals.
Journal ArticleDOI
Formation of a silicato-iron(III) complex in dilute aqueous solution
Walter J. Weber,W. Stumm +1 more
Journal ArticleDOI
A new approach to the generation of metal-bearing, medium-pore, shape-selective zeolites for fischer-tropsch catalysis: spectroscopic studies of zeolites
TL;DR: In this paper, the authors combined two recent developments in zeolite synthesis and modification to demonstrate a new approach to the generation of metalbearing, medium-pore, shape-selective zeolites for use as catalysts in Fischer-Tropsch conversions.