Incorporation of Nb(V) into BEA zeolite investigated by XRD, NMR, IR, DR UV-vis, and XPS

被引：48
作者：
Dzwigaj, Stanislaw [1 ,2 ]
Millot, Yannick [3 ,4 ]
Methivier, Christophe [1 ,2 ]
Che, Michel [1 ,2 ,4 ,5 ]
机构：
[1] Univ Paris 06, Lab React Surface, UMR 7197, F-75252 Paris 05, France
[2] CNRS, UMR 7197, Lab React Surface, F-75252 Paris, France
[3] Univ Paris 06, Lab Syst Interfaciaux Echelle Nanometr, UMR 7142, F-75252 Paris 05, France
[4] CNRS, UMR 7142, Lab Syst Interfaciaux Echelle Nanometr, F-75252 Paris 05, France
[5] Inst Univ France, Paris, France
来源：
MICROPOROUS AND MESOPOROUS MATERIALS | 2010年 / 130卷 / 1-3期
关键词：
BEA; Zeolite; Nb; NMR; DR UV-vis; SELECTIVE CATALYTIC-REDUCTION; BETA-ZEOLITE; MOLECULAR-SIEVES; NIOBIUM OXIDE; ACID SITES; NO; NB; CO; SPECTROSCOPY; DEHYDRATION;
D O I：
10.1016/j.micromeso.2009.10.027
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Nb(x)SiBEA (x = 1.0, 1.5 Nb wt%) zeolites are prepared by a two-step postsynthesis method involving first the creation of vacant T-atom sites associated with silanol groups by dealumination of BEA zeolite by nitric acid solution and then by impregnation of the resulting SiBEA zeolite with the niobium ethoxide Nb(OC(2)H(5))(5) precursor. The incorporation of Nb into the framework of SiBEA as isolated mononuclear Nb(V) species is evidenced by XRD, (29)Si MAS NMR, (1)H-(29)Si CP-MAS NMR, IR and (1)H MAS NMR. DR UV-vis investigation shows that two types of framework mononuclear Nb(V) ions are present, evidenced by two bands at 222 and 236 nm, the intensity of which increases with Nb content. XP spectra with a doublet peaks at BE of 209.6-209.9 eV for Nb 3d(3/2) and of 206.9-207.5 eV for Nb 3d(5/2) show that niobium is present in the framework BEA zeolite as Nb(V). (C) 2009 Elsevier Inc. All rights reserved.
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页码：162 / 166
页数：5
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