Expansion of the ADOR strategy for the synthesis of new zeolites : the synthesis of IPC-12 from zeolite UOV

R.E.M. thanks the Royal Society and the Engineering and Physical Sciences Research Council (Grants EP/K025112/1, EP/K005499/1, EP/L016419/1) for funding work in this area and for providing a Ph.D. studentship to S.E.R. through the Criticat Centre for Doctoral training. R.E.M. and M. O. acknowledge the OP VVV "Excellent Research Teams", project No. CZ.02.1.01/0.0/0.0/15_003/0000417 - CUCAM. J.Č., V.K., and M.T. acknowledge the Czech Science Foundation for the project of the Centre of Excellence (P106/12/G015) and J.Č has received funding from the European Union's Horizon2020 research and innovation programme under grant agreement No 640979. The research leading to these results has received funding from the European Union Seventh Framework Programme under Grant Agreement No. 312483—ESTEEM2 (Integrated Infrastructure Initiative–I3).The assembly-disassembly-organization-reassembly (ADOR) process has been used to disassemble a parent zeolite with the UOV structure type and then reassemble the resulting layers into a novel structure, IPC-12. The structure of the material has previously been predicted computationally and confirmed in our experiments using X-ray diffraction and atomic resolution STEM-HAADF electron microscopy. This is the first successful application of the ADOR process to a material with porous layers.Publisher PDFPeer reviewe

Experimental study of mercury removal from exhaust gases

An initial study has been made of the use of synthetic zeolites for mercury capture from exhaust gases. Synthetic zeolites (Na-X and Na-P1), and for comparison a natural zeolite (clinoptilolite) and activated carbon with bromine (AC/Br) were tested for mercury uptake from a gaseous stream. The materials were subjected to mercury adsorption tests and their thermal stability was evaluated. The untreated synthetic zeolites had negligible mercury uptake, but after impregnation with silver, the adsorption of mercury was markedly improved. The synthetic zeolite Na-X impregnated with silver adsorbed significantly more mercury before breakthrough than the activated carbon impregnated with bromine, indicating the potential of zeolite derived from coal fly ash as a new sorbent for capture of mercury from flue gases

Multipore zeolites: synthesis and catalytic applications

[EN] In the last few years, important efforts have been made to synthesize so-called "multipore" zeolites, which contain channels of different dimensions within the same crystalline structure. This is a very attractive subject, since the presence of pores of different sizes would favor the preferential diffusion of reactants and products through those different channel systems, allowing unique catalytic activities for specific chemical processes. In this Review we describe the most attractive achievements in the rational synthesis of multipore zeolites, containing small to extra-large pores, and the improvements reported for relevant chemical processes when these multipore zeolites have been used as catalysts.Financial support by the Spanish Government-MINECO through “Severo Ochoa” (SEV 2012-0267), Consolider Ingenio 2010-Multicat, MAT2012-37160, MAT2012-31657 and Intramural-201480I015 is acknowledged.Moliner Marin, M.; Martínez, C.; Corma Canós, A. (2015). Multipore zeolites: synthesis and catalytic applications. Angewandte Chemie International Edition. 54(12):3560-3579. https://doi.org/10.1002/anie.201406344S35603579541

Synthèse de nouveaux solides microporeux germanates et silicogermanates à charpentes tridimensionnelles

Dans le cadre de l'élaboration de nouveaux matériaux zéolithiques, cette thèse avait pour objet l'obtention des équivalents gennanate ou silicogezmanate de matériaux de type métallophosphate dont la charpente contient des unités double-cycle à 4 tétraèdres (ou D4MR). L'idée directrice était que, sous réserve de déterminer les conditions de synthèse adéquates, une topologie donnée pourrait être transposée avec le même structurant organique du système phosphate au système (silico)gennanate, ce dernier système favorisant l'obtention de topologies contenant des unités D4MR. Les nombreuses synthèses hydrothermales réalisées n'ont jamais permis d'obtenir l'équivalent silicogezmanate d'un matériau phosphate, mais ont en revanche conduit à la découverte de six nouvelles phases microporeuses : IM-13 (1,6-diaminohexane), IM-14 et IM-15 (éthylènediamine), IM-16 (1-éthyl-3-méthylimidazolium), IM-17 (décaméthonium) et IM-18 (4-diméthylaminopyridine).In order to prepare new zeolitic materials, the aim of this thesis was to obtain in the germanate or silicogezmanate system the framework structures of phosphate materials whose frameworks contain double four member ring units (or D4MR). The idea was that it could be possible under appropriate conditions to transpose a framework from the phosphate to the silicogennanate system with the same organic directing agent, the latter system making the synthesis of frameworks containing D4MRs easier. After selection of sonie phosphate frameworks and of their structure directing agents, the numerous hydrothermal syntheses that have been made did not lead to the equivalent of any phosphate. However six novel microporous materials have been discovered : IM-13, synthesised with 1,6-diaminohexane, IM-14 and IM-15, obtained with ethylenediamine, and IM-16, LM-17 and IM-18, synthesised with the 1-ethyl-3-methylimidazolium cation, decamethonium cation or 4-dimethylaminopyridine respectively.MULHOUSE-SCD Sciences (682242102) / SudocSudocFranceF

Synthesis of Zr-UiO-66 with Tuned Acidity and their Performance in Dehydration of Fructose

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RINspector: A Cytoscape app for centrality analyses and DynaMine flexibility prediction

Motivation Protein function is directly related to amino acid residue composition and the dynamics of these residues. Centrality analyses based on residue interaction networks permit to identify key residues in a protein that are important for its fold or function. Such central residues and their environment constitute suitable targets for mutagenesis experiments. Predicted flexibility and changes in flexibility upon mutation provide valuable additional information for the design of such experiments. Results We combined centrality analyses with DynaMine flexibility predictions in a Cytoscape app called RINspector. The app performs centrality analyses and directly visualizes the results on a graph of predicted residue flexibility. In addition, the effect of mutations on local flexibility can be calculated.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Calcium-based hydrated minerals: Promising halogen-free flame retardant and fire resistant additives for polyethylene and ethylene vinyl acetate copolymers

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Isomorphous Substitution of Al by Zr in ZSM-5 zeolite: Approaches in Synthesis and Characterization

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Effect of spray drying treatment on the optical properties of Mg–Al spinel ceramics

International audienceIn recent years, Mg–Al spinel ceramic has been in the spotlight due to its large transparency range and goodmechanical properties. The aim here, was to control the state of agglomeration of powder to improve densifi-cation behaviour and consequently optical and mechanical properties of the ceramics. Commercial powder with asmall particle size was used and exhibits poorflowability, which was found to be detrimental to shaping and ledto a translucent ceramic with an opaque crown. The powder was granulated by spray drying and the influence ofthe molecular mass of added polyethylene glycol on the granulate size, compaction andfinally sinteringbehaviour was investigated. Special attention was paid to the differences in rheological behaviour of powders,which was thoroughly characterized with a FT4 powder rheometer. Agglomeration of powder improved in-linetransmission at 650 nm up to 71% compared to 3% for ceramic from as-received powde

Elaboration de monolithes de silice mésoporeuse à porosités hiérarchisées à l’aide de porogènes polymériques

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