Journal ArticleDOI
Charting cation migration in a nickel exchanged zeolitic catalyst: An in situ rietveld X-ray study†
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This article is published in Advanced Materials.The article was published on 1990-04-01. It has received 46 citations till now. The article focuses on the topics: Nickel & Catalysis.read more
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Extraframework cation distributions in X and Y faujasite zeolites: A review
Tom Frising,Philibert Leflaive +1 more
TL;DR: The catalysis and sorption properties of faujasite zeolites depend largely on the extraframework species present, notably the cations as discussed by the authors, and a review paper gathers all cation distributions in X and Y type faujaite type zeolite known to the authors and available in the literature by mid 2007.
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NOx Reduction from Diesel Emissions over a Nontransition Metal Zeolite Catalyst: A Mechanistic Study Using FTIR Spectroscopy
TL;DR: In this paper, the reaction of NO2 with acetaldehyde starts with the formation of acetate ions and subsequently the aci-anion of nitromethane, which is stabilized in the ionic environment of the zeolite to form a proposed O2NCH2NO2- intermediate.
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Rigid-Unit Modes and the Quantitative Determination of the Flexibility Possessed by Zeolite Frameworks
TL;DR: In this paper, the flexibility of tetrahedra has been studied in terms of rigid unit modes (RUMs) and wave packets of standard RUM phonon modes for any given zeolite.
Journal ArticleDOI
In situ combined X‐ray absorption spectroscopic and X‐ray diffractometric studies of solid catalysts
TL;DR: In this article, the merits of employing combined in situ X-ray absorption spectroscopy (XAS) and Xray diffractometry (XRD) are described by reference to a number of examples, which encompass: (i) crystallisation of molecular sieve catalysts, (ii) determination of the atomic architecture of active sites in CoALPO and MnALPO catalysts; (iii) thermal stability and change of structure in the immediate vicinity to (and at a distance away from) transition metal ion active sites, in microporous catalysts.
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The Ineluctable Need for in Situ Methods of Characterising Solid Catalysts as a Prerequisite to Engineering Active Sites
TL;DR: In this paper, the structure of a solid oxide catalysts has been determined in atomic detail using combined X-ray absorption spectroscopy and x-ray diffraction techniques, and the active site has been identified.
References
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Journal ArticleDOI
A profile refinement method for nuclear and magnetic structures
TL;DR: In this paper, a structure refinement method was described which does not use integrated neutron powder intensities, single or overlapping, but employs directly the profile intensities obtained from step-scanning measurements of the powder diagram.
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Uniform Heterogeneous Catalysts: The Role of Solid‐State Chemistry in their Development and Design
TL;DR: In this article, a review of the performance of existing heterogeneous catalysts and the design of those yet to be prepared can be placed on a rational footing; moreover, the myriad techniques of solid-state chemistry and physics, often regarded as inapplicable to the subtle and special problems of surface chemistry, are seen to be of direct relevance as probes for the structure and properties of proven uniform heterogeneous catalyst as well as for the synthesis and development of new ones.
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Location of nickel ions in Y zeolites. I. Influence of thermal treatment and exchange level on nickel positions
P. Gallezot,B. Imelik +1 more
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X-ray evidence for residual water in calcined divalent cation faujasite-type zeolites
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A study of Si,Al ordering in thallium zeolite-A by powder neutron diffraction
TL;DR: In this article, the cubic structure of thallium zeolite-A has been studied by high resolution powder neutron diffraction and it is shown that Si and Al are strictly alternating within the aluminosilicate framework (space group Fm3c) are better than those in which each Si is linked, by oxygen bridges, to three Al and one Si.
Related Papers (5)
Location of nickel ions in Y zeolites. I. Influence of thermal treatment and exchange level on nickel positions
P. Gallezot,B. Imelik +1 more