Kinetics of formation of zeolitic solid solutions

Barrer, R. M.; Ibbitson, D. A.

doi:10.1039/tf9444000206

Cited by 34 publications

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“…They have been studied both in solid 80,81 and solution phases, 151,152 taking advantage of their easy functionalisation, large structural diversity, and, mainly, the cone-like configuration, which potentiates their use in complexation and recognition chemistry, with potential applications in sensor and separation technologies. [82][83][84] The most widely used calixarenes are tetramers, i.e., in calixarene nomenclature, calix [4]arenes, much due to their precedence, 153 despite the growing interest in other types of calixarenes. [154][155][156] The crystal structures formed by calixarenes give typically rise to unidimensional pores of nanometric size, whether meso-or microporous.…”

Section: Organic Supramolecular Microporous Solidsmentioning

confidence: 99%

“…Since the initial studies on gas adsorption on natural zeolites, [1][2][3] their potential as selective adsorbents of gases was immediately recognized, inducing intensive research on the field. 3,4 Studies on their use as adsorbents 5 and catalysts 6 paved the way to massive industrial usage. 5,6 Presently, zeolite-based Professor Ad elio Mendes (born 1964) received his PhD degree from the University of Porto in 1993.…”

Section: Introduction 11 Microporous Solidsmentioning

confidence: 99%

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Peptide-based solids: porosity and zeolitic behavior

2012

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Among the greatest challenges in the field of microporous solids is the development of ''smart'' materials, displaying environment-triggered property tuning. These could be used both in traditional and new applications of microporous materials. In this context, supramolecular peptide-based solids have recently emerged as interesting alternatives to standard microporous solids, such as zeolites and carbon molecular sieves. They possess framework and conformational flexibility, are kinetically stable and reasonably thermally resistant. Important properties such as pore size and inner wall chemistry can be controlled through appropriate chemical modification of the peptide molecules. Peptide-based porous solids have permanent microporosity, often with molecularly sized cavities created by removal of co-crystallised solvent. Some have already been successfully tested as adsorbents and permselective materials, confirming their potential. This review covers the identification, synthesis, characterization techniques and properties of peptide-based microporous solids, discussing their most unique functionalities.

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Section: Organic Supramolecular Microporous Solidsmentioning

confidence: 99%

Section: Introduction 11 Microporous Solidsmentioning

confidence: 99%

Peptide-based solids: porosity and zeolitic behavior

2012

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“…If we consider sorption from the gas at a fixed reference pressure P, taken as 1 atm, (5) (6) (7) where sgo, Hgo and ego are molar entropy, enthalpy and free energy of the sorbate vapour at the pressure P and ps denotes the chemical potential of the sorbed molecules uzder t_he equilibrium pressurep. For an isothermal process, neglecting gas imperfections, Hgo= H, and so A H " = AH.…”

Section: Thermodynamic Datamentioning

confidence: 99%

Structure of faujasite and properties of its inclusion complexes with hydrocarbons

Barrer¹,

Bultitude²,

Sutherland³

1957

Trans. Faraday Soc.

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An account has been given of the channel system in faujasite and of the occlusion within it of benzene, toluene, cyclopentane and cyclohexane over a range of temperatures and pressures. The numbers of molecules occluded per unit cell range between 32.8 (cyclohexane) and 44-8 (cyclopentane). Near saturation of the crystals the apparent thermal expansivities are a little less than the expansivities of the liquid hydrocarbons. Heats of inclusion have been derived, and also partiai molar entropies 3, of the occluded hydrocarbons. In the region close to saturation (0.93 < 0 < 0.99) the localized sorption model becomes approximately valid. The analysis of Ss in this range of 8 shows that the cyclic hydrocarbons, as well as a number of n-and iso-paraffins previously investigated, have lost a considerable amount of thermal entropy relative to the liquid state. Limitations in the analysis of entropy functions have been indicated.Increasing attention is being given to inclusion complexes from the viewpoints of non-stoichiometry,l-3 structure,4-6 kinetics,6-8 calorimetry 9-11 and statistical thermodynamic interpretation.12-16 The novel uses to which such materials may be put, particularly for separating mixtures 17-19 including the resolution of optical isomers,zO has stimulated a search for new host ~rystals.21-23 The most open and stable of these are found among aluminosilicates, and in particular among the zeolites. In a previous paper 14 we have reported upon the energetics and equilibria of inclusion complexes of paraffin hydrocarbons C1 to c g by the most open known crystal, faujasite. In this paper we record similar measurements for some cyclic hydrocarbons, and consider further the interpretation of these and of some of the previous results. EXPERIMENTAL A N D RESULTS APPARATUS AND MATERIALSThe apparatus and experimental methods have been described elsewhere.14 Cyclopentane and cyclohexane were respectively of 99.95 & 0.02 and 99-99 f 0 0 0 5 % purity as supplied by the Chemical Research Laboratory, Teddington. A.R. benzene and toluene were fractionally distilled in vacuo, and measurements were made of their vapour pressure against temperature curves and their refractive indices. A final purity > 99.5 % was estimated. For the X-ray investigation a Hilger HRX X-ray unit was employed, with 9 cm cameras, and a Guinier camera for powder photography, and a Weissenberg camera for single crystal photographs. SOME STRUCTURAL ASPECTS OF THE HOST CRYSTALIn this section we report on features of the structure of faujasite of importance from the viewpoint of its channel and cage system and so for its inclusion complexes. Work in these laboratories 24 and elsewhere 2% 26, 26a has shown that natural faujasite has a cubic unit cell and space-group 0~7-Fd3m. That from Sasbach in the Kaiserstuhl has a unit cell edge of -24-65 A. The synthetic crystals used in this work have the same space group but a slightly larger unit cell edge of -24.94ii and a somewhat different A1203/Si02 ratio.The nature of the aluminosilicate framework has be...

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“…General discussion on the applications of thermodynamics are given by Redlich and ICister (24) on nonelectrolyte solutions, and by Sage and co-workers (25, 150, 151, 159-162, 165, 166) on multicomponent systems. Vapor-liquid equilibria for specific ternary systems are given by Drickamer and Bradford (113), by Benedict, Solomon, and Rubin (105), by Gerster, Mertes, and Colburn (120), by Hunter and Brown (133), by McCurdy and Katz (145), by McMillan and McDonald (147), by Schneider and Lynch (171), by Schumacher and Hunt (172), and by York and Holmes (182). Special mention should be made of the extensive investigations on vapor-liquid equilibria by Brown and associates (108,128,129,135,179,180), by Colburn and associates (109,110,120,134,148), by by Griswold and associates (121-125) and by Scatchard and associates (167-169).…”

Section: Generalized Methods For Gases and Liquidsmentioning

confidence: 99%

Applied Kinetics and Equilibria

Hougen¹

1948

Ind. Eng. Chem.

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Kinetics of formation of zeolitic solid solutions

Cited by 34 publications

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Peptide-based solids: porosity and zeolitic behavior

Peptide-based solids: porosity and zeolitic behavior

Structure of faujasite and properties of its inclusion complexes with hydrocarbons

Applied Kinetics and Equilibria

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