Download e-book for iPad: Advances in Nanoporous Materials by Stefan Ernst (Eds.)

By Stefan Ernst (Eds.)

ISBN-10: 0444531793

ISBN-13: 9780444531797

Advances in Nanoporous fabrics is a set of entire studies of lasting worth within the box of nanoporous fabrics. The contributions hide all facets of nanoporous fabrics, together with their instruction and constitution, their post-synthetic amendment, their characterization and their use in catalysis, adsorption/separation and all different fields of capability program, e.g. membranes, host/guest chemistry, environmental security, electrochemistry, sensors, optical units, and so forth. The time period Nanoporous fabrics is known to contain all type of porous solids which own pores within the variety from ca. 0.2 nm as much as ca. 50 nm, without reference to their chemical composition, their starting place (natural or artificial) and their amorphous or crystalline nature. ordinary examples are zeolites and zeolite-like fabrics (e.g., crystalline microporous aluminophosphates and their derivatives), mesoporous oxides like silica, silica-alumina etc., steel natural frameworks, pillared clays, porous carbons and similar fabrics. The contributions review the literature in a definite sector completely and severely and supply a cutting-edge evaluate to the reader. state of the art studies preserve assurance present large scope presents a whole topical evaluation Contributions from popular specialists lend authority to the cloth

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154]). 46 Juergen Caro and Manfred Noack and (ii) the selectivity to i-butene is increased since hydrogenolysis is suppressed. As a result, at the beginning of the reaction the i-butene yield in the membrane reactor is higher by approximately 1/3 than in the conventional fixed-bed. However, because of the hydrogen removal, coking is promoted and after approximately 2 h time-on-stream the olefin yield of the membrane reactor drops below that of the classical packed-bed [223]. After an oxidative regeneration, however, the activity and selectivity of the membrane reactor (membrane and catalyst) are restored completely.

Following Refs. [122–124], the limiting relations for the single component flux Ni of the component i are Low loadings: N i ¼ Àqsat rDi K i Dpi i d High loadings: N i ¼ Àqsat rDi D ln pi i d with Ni, Di, qisat, Ki, and pi denoting the flux, diffusivity, saturation loading, adsorption equilibrium constant, and partial pressure of component i, respectively. d and r are the membrane thickness and density. The maxima and minima of the flux as a function of temperature can be explained by the Arrhenius type temperature dependencies of K and D due to K ¼ K0 exp (-DH/RT)6 and D ¼ D0 exp(-Ea/RT) with DH and Ea as enthalpy of 6 Since adsorption is exothermic, the enthalpy of adsorption is negative, which results in a positive exponent.

10). 3 Permeation of single components There are some detailed qualitative and quantitative descriptions of the permeation behavior of single gases in zeolite membranes [44,94–96], but a detailed theoretical treatment is difficult because of the lack of reliable experimental permeation data on perfect zeolite membranes. When probe molecules of different size are sent through a perfect zeolite membrane, molecular sieving can be expected, which is based on the principle that permeating molecules must be smaller (cut off) than the pores of the membrane [97,98] (Fig.

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Advances in Nanoporous Materials by Stefan Ernst (Eds.)


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