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

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