Cation migration and structural modification of Co-exchanged ferrierite upon heating: a time-resolved X-ray powder diffraction study

被引：38

作者：

Dalconi, MC ^{[1
]}

Alberti, A ^{[1
]}

Cruciani, G ^{[1
]}

机构：

[1] Univ Ferrara, Sect Mineral, Dept Earth Sci, I-44100 Ferrara, Italy

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2003年 / 107卷 / 47期

关键词：

D O I：

10.1021/jp030351a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The in situ time-resolved analysis of Co-exchanged synthetic ferrierite was performed in the range 53-810 degreesC by Rietveld refinements of powder diffraction data. The small contraction of the unit cell volume (-2.35%) confirmed that the ferrierite framework behaves as a noncollapsible framework. Moreover, continuous monitoring of the structural modifications induced by heating showed that cobalt ions migrate to new positions following the dehydration process step by step. Above 500 degreesC, five cation sites were localized; four of these are readily accessible to absorbed molecules and act as Lewis acid sites.

引用

页码：12973 / 12980

页数：8

共 29 条

[1] STATISTICAL AND TRUE SYMMETRY OF FERRIERITE - POSSIBLE ABSENCE OF STRAIGHT T-O-T BRIDGING BONDS [J].

ALBERTI, A ;

SABELLI, C .

ZEITSCHRIFT FUR KRISTALLOGRAPHIE, 1987, 178 (1-4) :249-256

[2]

Alberti A., 1983, P 6 INT ZEOLITE C, P834

[3] On the nature of nonframework cations in a zeolitic deNOx catalyst -: A synchrotron X-ray diffraction and ESR study of Cu-ferrierite [J].

Attfield, MP ;

Weigel, SJ ;

Cheetham, AK .

JOURNAL OF CATALYSIS, 1997, 172 (02) :274-280

[4] SELF-LIMITING DISTORTION BY ANTIROTATING HINGES IS THE PRINCIPLE OF FLEXIBLE BUT NONCOLLAPSIBLE FRAMEWORKS [J].

BAUR, WH .

JOURNAL OF SOLID STATE CHEMISTRY, 1992, 97 (01) :243-247

[5]

Bellussi G, 2001, STUD SURF SCI CATAL, P911, DOI DOI 10.1016/S0167-2991(01)80261-5

[6]

CIAMBELLI P, COMMUNICATION

[7]

Cruciani G, 1999, P 12 INT ZEOL C, P2361

[8] Ni2+ ion sites in hydrated and dehydrated forms of Ni-exchanged zeolite ferrierite [J].

Dalconi, MC ;

Cruciani, G ;

Alberti, A ;

Ciambelli, P ;

Rapacciuolo, MT .

MICROPOROUS AND MESOPOROUS MATERIALS, 2000, 39 (03) :423-430

[9] Siting and coordination of cobalt in ferrierite: XRD and EXAFS studies at different Co loadings [J].

Dalconi, MC ;

Alberti, A ;

Cruciani, G ;

Ciambelli, P ;

Fonda, E .

MICROPOROUS AND MESOPOROUS MATERIALS, 2003, 62 (03) :191-200

[10] A NONEMPIRICAL MOLECULAR-ORBITAL STUDY OF THE SITING AND PAIRING OF ALUMINUM IN FERRIERITE [J].

FRIPIAT, JG ;

GALET, P ;

DELHALLE, J ;

ANDRE, JM ;

NAGY, JB ;

DEROUANE, EG .

JOURNAL OF PHYSICAL CHEMISTRY, 1985, 89 (10) :1932-1937

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