New PDF release: Advances in Nanoporous Materials

By Stefan Ernst (Eds.)

ISBN-10: 0444531793

ISBN-13: 9780444531797

Advances in Nanoporous fabrics is a set of entire reports of lasting worth within the box of nanoporous fabrics. The contributions hide all elements 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 power program, e.g. membranes, host/guest chemistry, environmental safeguard, 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, regardless of their chemical composition, their foundation (natural or man made) and their amorphous or crystalline nature. standard 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 comparable fabrics. The contributions review the literature in a undeniable zone completely and seriously and supply a cutting-edge assessment to the reader. cutting-edge reports retain assurance present large scope presents an entire topical evaluate Contributions from well known specialists lend authority to the fabric

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Extra resources for Advances in Nanoporous Materials

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M−2 . s−1] 5 10 1 0 0 10−6 10−5 10−4 10−3 10−2 10−1 Support thickness [m] Figure 18 Simulation of the permeation behavior of a 95%/5% methane/propane mixture through a supported silicalite-1 membrane at 30 1C according to the full GMS model as a function of the thickness of the supporting layer (Trumen, sintered stainless steel with a titania intermediate layer): fluxes of both components and propane selectivity. Wicke-Kallenbach method with He as sweep gas, silicalite-1 membrane facing the feed mixture, both sides at 101 kPa.

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.

A recent example of fine chemical reaction carried out in a membrane microreactor is the Knoevenagel condensation reaction where the selective removal of the by-product water during the reaction led to a 25% improvement in the conversion [232]. The reaction between benzaldehyde and ethyl cyanoacetate to produce ethyl-2-cyano-3-phenylacrylate was catalyzed by a CsNaX zeolite catalyst deposited on the micro channel and the water was selectively pervaporated across a LTA membrane (Fig. 27a) [233]. All the water produced by the reaction was completely removed and the membrane was operating below its capacity [234].

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Advances in Nanoporous Materials by Stefan Ernst (Eds.)


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