Bulk and surface properties of commercial kaolins

被引：99

作者：

Castellano, Maila ^{[2
]}

Turturro, Antonio ^{[2
]}

Riani, Paola ^{[2
]}

Montanari, Tania ^{[1
]}

Finocchio, Elisabetta ^{[1
]}

Ramis, Gianguido ^{[1
]}

Busca, Guido ^{[1
]}

机构：

[1] Univ Genoa, Lab Chim Superfici & Catalisi Ind, Dipartimento Ingn Chim & Proc, I-16129 Genoa, Italy

[2] Univ Genoa, Dipartimento Chim & Chim Ind, I-16146 Genoa, Italy

来源：

APPLIED CLAY SCIENCE | 2010年 / 48卷 / 03期

关键词：

Kaolins; Structure; Chemical properties; Surface acidity; Adsorption of acetonitrile; CATALYTIC CRACKING; CLAY-MINERALS; SPECTROSCOPY; ACID; SPECTRUM; REMOVAL; FTIR;

D O I：

10.1016/j.clay.2010.02.002

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：

Four different commercial kaolins have been characterized by specific surface measurement. X-ray diffraction, transmission electron microscopy, SEM-EDX analysis, TGA measurements, DR-UV-Vis-NIR spectroscopy, transmission IR spectroscopy of the samples as such and after acetonitrile adsorption. A correlation between surface acidity and structural and chemical properties was attempted. Kaolinite surface was almost neutral, with a very small amount of medium acidic centers. These centers gave rise to a weak protonic acidity arising from bridging hydroxy-groups on exposed basal planes (exposed gibbsite-like layers), and silanol groups likely formed on non-basal planes, as well as medium strength Lewis acid sites likely exposed on non-basal planes. Lewis and Bronsted sites may also arise from mineral impurities (e.g. anatase, amorphous silica-alumina). (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：446 / 454

页数：9

共 45 条

[1]

Adams JM, 2006, DEV CLAY SCI, V1, P541, DOI 10.1016/S1572-4352(05)01017-2

[2] Mineralogical interference on kaolinite crystallinity index measurements [J].

Aparicio, P ;

Galán, E .

CLAYS AND CLAY MINERALS, 1999, 47 (01) :12-27

[3] EFFECT OF PELLET PRESSING ON THE INFRARED-SPECTRUM OF KAOLINITE [J].

BELL, VA ;

CITRO, VR ;

HODGE, GD .

CLAYS AND CLAY MINERALS, 1991, 39 (03) :290-292

[4]

Bergaya F, 2006, DEV CLAY SCI, V1, P1

[5] RIETVELD REFINEMENT OF THE KAOLINITE STRUCTURE AT 1.5-K [J].

BISH, DL .

CLAYS AND CLAY MINERALS, 1993, 41 (06) :738-744

[6] Adsorption of salicylic acid on bentonite and kaolin and release experiments [J].

Bonina, F. P. ;

Giannossi, M. L. ;

Medici, L. ;

Puglia, C. ;

Summa, V. ;

Tateo, F. .

APPLIED CLAY SCIENCE, 2007, 36 (1-3) :77-85

[7] Polymer-filler interactions in kaolin/nylon 6,6 composites containing a silane coupling agent [J].

Buggy, M ;

Bradley, G ;

Sullivan, A .

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING, 2005, 36 (04) :437-442

[8]

Busca G, 2006, CHEM INDUST, V108, P247

[9] Spectroscopic characterization of the acid properties of metal oxide catalysts [J].

Busca, G .

CATALYSIS TODAY, 1998, 41 (1-3) :191-206

[10]

Busca G., 2000, Encyclopedia of Analytical Chemistry, V12, P10984

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