Kinetics of zeolite dealumination in steam

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Zeolite dealumination is a well known phenomenon that contributes to the deactivation or activation of catalysts in several different applications. The most obvious effect is in acid catalysis where dealumination under reaction conditions removes the Broensted sites, thus deactivating the catalyst. The authors are interested in the use of cation exchanged zeolites as selective reduction catalysts for removal of NO{sub x} from exhaust streams, particularly from automotive exhaust. In this case, copper exchanged ZSM-5 has been shown to be an effective catalyst for the generic reaction of NO{sub x} with hydrocarbons. However, high temperature and steam in combustion exhaust causes ... continued below

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Hughes, C.D.; Labouriau, A.; Crawford, S.N.; Romero, R.; Quirin, J. & Earl, W.L. July 1998.

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  • Los Alamos National Laboratory
    Publisher Info: Los Alamos National Lab., Chemical Science and Technology Div., NM (United States)
    Place of Publication: New Mexico

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Description

Zeolite dealumination is a well known phenomenon that contributes to the deactivation or activation of catalysts in several different applications. The most obvious effect is in acid catalysis where dealumination under reaction conditions removes the Broensted sites, thus deactivating the catalyst. The authors are interested in the use of cation exchanged zeolites as selective reduction catalysts for removal of NO{sub x} from exhaust streams, particularly from automotive exhaust. In this case, copper exchanged ZSM-5 has been shown to be an effective catalyst for the generic reaction of NO{sub x} with hydrocarbons. However, high temperature and steam in combustion exhaust causes dealumination and consequent migration of copper out of the zeolite structure resulting in rapid deactivation of the catalyst. Dealumination of zeolites has been reported by many authors in uncountable papers and cannot be reviewed here. However, to the authors` knowledge there are no reports on the kinetics of dealumination under varying conditions of temperature and steam. By measuring the kinetics of dealumination with different zeolites and exchange cations they expect to develop working models of the dealumination process that will allow control of zeolite deactivation. This manuscript is a description of the basic techniques used and a progress report on the very beginning of this study.

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5 p.

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OSTI as DE98003702

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  • 12. international zeolite conference, Baltimore, MD (United States), 5-10 Jul 1998

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  • Other: DE98003702
  • Report No.: LA-UR--98-642
  • Report No.: CONF-980734--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 661449
  • Archival Resource Key: ark:/67531/metadc709235

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  • July 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 3, 2016, 1:28 p.m.

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Hughes, C.D.; Labouriau, A.; Crawford, S.N.; Romero, R.; Quirin, J. & Earl, W.L. Kinetics of zeolite dealumination in steam, article, July 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc709235/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.