Download Advances in Nanoporous Materials by Stefan Ernst (Eds.) PDF

By Stefan Ernst (Eds.)

ISBN-10: 0444531793

ISBN-13: 9780444531797

Advances in Nanoporous fabrics is a suite of accomplished reports of lasting price within the box of nanoporous fabrics. The contributions hide all elements of nanoporous fabrics, together with their guidance 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 safeguard, electrochemistry, sensors, optical units, and so forth. The time period Nanoporous fabrics is known to include 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. normal 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 undeniable region completely and significantly and supply a cutting-edge review to the reader. state of the art studies continue insurance present wide scope presents an entire topical assessment Contributions from popular specialists lend authority to the cloth

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21b). Owing to these component fluxes in the binary mixture permeation, the mixture selectivity is almost constant around a value of 4 at 301C with increasing gas pressure (Fig. 3 kPa with increasing temperature (Fig. 22b). Summarizing, the GMS Juergen Caro and Manfred Noack 6 6 Selectivity for CO2 Selectivity for CO2 42 4 2 80 (a) 120 160 200 pf,tot [kPa] 240 4 2 300 320 340 360 380 400 420 (b) Temperature [K] Figure 22 Mixture permeation selectivity for CO2 based on the data of Fig. 3 kPa; open symbols (J) indicate the ideal selectivity, the filled ones (K) the real mixture selectivity, the lines are the GMS model predictions [194].

There are contradicting statements on the separability of CO2 from gas mixtures by zeolite membranes. As an example, in [214] for equimolar mixtures CO2/N2 on FAU membranes the separation factor was determined to be a (CO2/N2)E2–5 at 30 1C whereas in [30], another selectivity with a (N2/CO2)E5–8 was reported. These different experimental findings can be explained by the role of moisture. 3 at 25 1C and a 43 Zeolite Membranes – Status and Prospective Separation factor (CO2/N2) 16 14 B-SS B-Al2O3 12 Na-SS Na-Al2O3 10 8 6 4 2 0 0 5 10 15 20 25 30 35 ΔP [bar] Figure 23 Separation factor for the separation of a CO2/N2 mixture (50%/50%) for variable retentate pressure at 25 1C [213].

60] obtained a selectivity of approximately 10 for a silicalite-1 membrane at 120 1C. CO2 has a stronger electrostatic quadrupole moment than N2 leading to a preferential adsorption of CO2 from N2/CO2 mixtures [204]. Thus, it can be expected that surface diffusion of CO2 contributes significantly to its permeation and simultaneously reduces the N2 permeation flux. The best results for the separation of CO2/N2 mixtures on large-pore zeolite membranes were reported by Kusakabe et al. [205,206] using FAU-type membranes.

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