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Volumn 127, Issue 37, 2005, Pages 12924-12932

Uniform catalytic site in Sn-β-zeolite determined using X-ray absorption fine structure

Author keywords

[No Author keywords available]

Indexed keywords

CATALYST ACTIVITY; CRYSTALLOGRAPHY; OXIDATION; X RAY ANALYSIS; ZEOLITES;

EID: 25144492700     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja052543k     Document Type: Article
Times cited : (141)

References (49)
  • 30
    • 0024282140 scopus 로고
    • Newsham, J. M.; Treacy, M. M. J.; Koetsier, W. T.; DeGruyter, C. B. Proc. R. Soc. London A 1988, 420, 375-405. Both the A and B polymorphs of β-zeolite are constructed of the same centrosymmetric building units that are arranged in layers that interconnect in either a left- (L) or right- handed (R) fashion. Polymorph A is RRRR or LLLL layers, while polymorph B has alternating RLRL stacking.
    • (1988) Proc. R. Soc. London A , vol.420 , pp. 375-405
    • Newsham, J.M.1    Treacy, M.M.J.2    Koetsier, W.T.3    DeGruyter, C.B.4
  • 36
    • 25144505612 scopus 로고    scopus 로고
    • note
    • The EXAFS spectrum is a sum of signals, each with a distinct frequency that is related to the distance between the Sn atoms and the neighboring atoms surrounding the Sn atoms in the sample. A Fourier transform (FT) of the EXAFS spectra separates the signals from each frequency, giving a peak with an amplitude related to the type and number of neighboring atoms and position related to the distance between the Sn atoms and the neighboring atoms. All the atoms with the same bond length, in a shell about the Sn atoms, are represented by a single peak in the FT of the data.
  • 39
    • 25144453646 scopus 로고    scopus 로고
    • note
    • These distances have been rounded to the nearest hundredth angstrom and then grouped to the nearest tenth of an angstrom; therefore, an accuracy of ±0.05 Å is understood, and well within the resolution of our measurements.
  • 40
    • 25144498288 scopus 로고    scopus 로고
    • note
    • 2 structure in the Sn-β sample.
  • 41
    • 25144519491 scopus 로고    scopus 로고
    • note
    • 2 value are √(2/ν) + 1 = 1.8, where √(2/ν) is one standard deviation and ν = 18 is the degrees of freedom in the fit.
  • 42
    • 25144487974 scopus 로고    scopus 로고
    • note
    • These distances are the same in both polymorphs of β-zeolite.
  • 43
    • 25144469182 scopus 로고    scopus 로고
    • Personal communication and to be published
    • (4l) Corma, A. Personal communication and to be published.
    • Corma, A.1


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.