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Jin H.,Nano Center for Fine Chemicals Fusion Technology | Prasetyanto E.A.,Nano Center for Fine Chemicals Fusion Technology | Jiang N.,Nano Center for Fine Chemicals Fusion Technology | Oh S.-M.,Gachon University | Park S.-E.,Nano Center for Fine Chemicals Fusion Technology
Applied Surface Science | Year: 2010

The adsorption behaviour of a series of n-alkanes, alkyl aromatics, and alcohols on different morphology TS-1 (Titanium Silicalite-1) zeolites were studied using the tracer chromatographic technique at the temperatures in the 473-573 K range. The adsorption studies were performed with nanostacked TS-1 (NSTS-1) and nonstacked TS-1 (TS-1). The NSTS-1 exhibits the stacked morphologies due to dehydration of hydroxyl groups on the external surface of crystallites through the selective absorption of microwave onto Ti species. The Henry constants and adsorption enthalpies have been estimated. The straight channels of the NSTS-1 having long pathway gave different selectivity in the Henry constants of long-chained hydrocarbons due to strong interaction with straight channel in stacked morphology, which gave the larger Henry constant than the TS-1. The Henry constants linearly increase with the increasing carbon number since more interactions are possible for long chains. © 2009 Elsevier B.V. All rights reserved.


Seo Y.-H.,Nano Center for Fine Chemicals Fusion Technology | Prasetyanto E.A.,Nano Center for Fine Chemicals Fusion Technology | Jiang N.,Nano Center for Fine Chemicals Fusion Technology | Oh S.-M.,Gachon University | Park S.-E.,Nano Center for Fine Chemicals Fusion Technology
Microporous and Mesoporous Materials | Year: 2010

High silica containing zeolite W having silica to alumina ratio of 6.4 was synthesized in solely KOH system using both conventional hydrothermal and microwave methods. The synthetic zeolite W with twin-ball type morphology was obtained from conventional hydrothermal synthesis and microwave synthesis gave prismatic morphology. Addition of ethylene glycol (EG) in the precursor gel affected to get more uniform morphologies of zeolite W in both hydrothermal and microwave synthesis. The obtained zeolite W was applied to the catalytic dehydration of methanol to dimethyl ether (DME) with 100% selectivity as well as high stability due to the mild acidity of zeolite W. © 2009 Elsevier Inc. All rights reserved.

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