BROWSE

Related Researcher

Author's Photo

Kwak, Ja Hun
Molecular Catalysis lab
Research Interests
  • Heterogeneous catalysis, molecular catalysis, ASlumima, zeolites

ITEM VIEW & DOWNLOAD

Non-thermal plasma-assisted NOx reduction over alkali and alkaline earth ion exchanged Y, FAU zeolites

Cited 28 times inthomson ciCited 35 times inthomson ci
Title
Non-thermal plasma-assisted NOx reduction over alkali and alkaline earth ion exchanged Y, FAU zeolites
Other Titles
Non-thermal plasma-assisted NOx reduction over alkali and alkaline earth ion exchanged Y, FAU zeolites
Author
Kwak, JahunJános SzanyiCharles H.F. Peden
Keywords
plasma-assisted NOx reduction; alkali and alkaline earth ion exchanged Y, FAU; catalyst preparation
Issue Date
2004-02
Publisher
ELSEVIER SCIENCE BV
Citation
CATALYSIS TODAY, v.89, no.1-2, pp.135 - 141
Abstract
The catalytic activities of a series of alkali and alkaline earth cation exchanged Y, FAU zeolites were investigated in the non-thermal plasma-assisted NOx reduction reaction using a simulated diesel engine exhaust gas mixture. The catalytic activity of the Y, FAU zeolite showed significant variations with both the nature of the charge compensating cation, and the method of catalyst preparation. Our results show that conventional multiple solution ion exchange is insufficient to prepare the most active catalyst for the given cationic form. The highest NOx conversion level was achieved over a Ba-Y, FAU which was prepared by a multiple ion exchange method, in which each solution ion exchange step was followed by a high temperature calcination. A systematic change in the catalytic activity was observed as a function of the charge density around the charge compensating cation. For both catalyst series (alkali and alkaline earth ion exchanged Y, FAU), the specific activity decreased with increasing electrostatic field around the charge compensating cation. The large difference in the NOx reduction activity at a given e/r ratio. however, may suggest different reaction mechanisms for the two sets of catalysts. Indeed, there is a noticeable difference in the product distribution (selectivity) for the alkali and alkaline earth series of catalysts. Our results also reveal that extreme care must be taken when catalytic activities are compared for seemingly similar materials. We found that two base zeolite materials with identical Si/Al ratios, obtained from the same manufacturer but from different synthesis batches show significantly different catalytic behavior. (C) 2003 Published by Elsevier B.V
URI
Go to Link
DOI
10.1016/j.cattod.2003.11.019
ISSN
0920-5861
Appears in Collections:
ECHE_Journal Papers
Files in This Item:
1-s2.0-S0920586103006199-main.pdf Download

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU