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  Zeolite Rho Loaded with Methylamines. I. Monomethylamine Loadings

Weidenthaler, C., Fischer, R. X., Abrams, L., & Hewat, A. (1997). Zeolite Rho Loaded with Methylamines. I. Monomethylamine Loadings. Acta Crystallographica Section B, 53(3), 429-439. doi:10.1107/S0108768196012529.

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 Creators:
Weidenthaler, Claudia1, Author              
Fischer, Reinhard X.1, Author
Abrams, Lloyd2, Author
Hewat, Alan3, Author
Affiliations:
1Fachbereich Geowissenschaften der Universität, Klagenfurter Strasse, D-28359 Bremen, Germany, ou_persistent22              
2Central Research and Development Department, E1 du Pont de Nemours & Co., Experimental Station, Wilmington, DE 19880, USA, ou_persistent22              
3Institut Laue-Langevin, F-38042 Grenoble CEDEX 9, France, ou_persistent22              

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 Abstract: Samples of two differently prepared zeolite rho loaded with different amounts of monomethylamine (MMA) were studied in their hydrated and dehydrated forms by X-ray and neutron diffraction. Both zeolites are partially dealuminated, as indicated by nonframework alumina, which is assumed to be Al2O3 or AlOOH. Series I was prepared from dry-calcined NH4-rho at 873 K, series II from steam-calcined NH4-rho at 773 K. The samples were loaded with different amounts of deuterated MMA, Rietveld refinements yielded the following results for series I (dry): (1) H3.8(H-MMA)5Cs0.2Al9Si39O2.Al2O3.28H2O, X-ray data collection at room temperature, Im3̅m, a = 14.9991 (2) Å, Rwp = 0.095; (2) composition as in (1), anhydrous and deuterated, neutron data collected at 5 K, disproportionation into two phases in I4̄3m, with a = 14.8410 (7) and 14.5273 (11) Å, Rwp = 0.038; (3) (H-MMA)8.8Cs0.2Al9Si39O96.Al2O3.25H2O, X-ray data collection at room temperature, I4̄3m, a = 14.9771 (2) Å, Rwp = 0.090. Series II (steam): (4) H0.3(H-MMA)5Cs0.7Al6Si42O96.2.5Al2O3.23H2O, X-ray data collected at room temperature, Im3̅m, a = 15.0323 (2) Å, Rwp = 0.124; (5) composition as in (4), anhydrous and deuterated, neutron data collected at 5 K, disproportionation into two phases in I4̄3m with a = 14.9151 (2) and 14.6475(8) Å, Rwp = 0.031. In the hydrated samples MMA resides on the center axis in the α-cage with the N atoms pointing to the single eight-ring; upon dehydration it migrates into the double eight-rings.

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Language(s): eng - English
 Dates: 1996-05-311996-10-011997-06-01
 Publication Status: Published in print
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1107/S0108768196012529
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Title: Acta Crystallographica Section B
  Other : Acta Crystallogr. Sect. B
Source Genre: Journal
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Publ. Info: New York : Wiley
Pages: - Volume / Issue: 53 (3) Sequence Number: - Start / End Page: 429 - 439 Identifier: ISSN: 0108-7681
CoNE: https://pure.mpg.de/cone/journals/resource/954925468299