Carboxylic groups in mesoporous silica and ethane-bridged organosilica: effect of the surface on the reactivity

被引：10

作者：

Fiorilli, Sonia ^{[1
]}

Camarota, Beatrice ^{[1
]}

Garrone, Edoardo ^{[1
]}

Onida, Barbara ^{[1
]}

机构：

[1] Politecn Torino, Dipartimento Sci Mat & Ingn Chim, I-10125 Turin, Italy

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2011年 / 13卷 / 03期

基金：

奥地利科学基金会;

关键词：

ORGANICALLY MODIFIED SILICATES; BINDING-SITES; FUNCTIONAL-GROUPS; HYBRID; ADSORPTION; SBA-15; ACCESS; DENSITY; AMINE;

D O I：

10.1039/c0cp01260b

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：

Proton-donor ability of carboxylic groups incorporated by co-condensation into SBA-15 and ethane-bridged periodic mesoporous organosilica (PMO) has been studied through IR spectroscopy by dosing ammonia, which forms reversibly COO- groups and NH4+ ions. The related equilibrium constants, determined by elaboration of IR data, reveal a lower reactivity of -COOH groups at the surface of PMO than on SBA-15, when the two samples have been outgassed at the same temperature. This finding is interpreted in terms of different dielectric constants and intermolecular interactions engaged with the surface species. Carboxylic groups on ethane-bridged organosilica react with silanols upon thermal treatment at 473 K to form a mixed anhydride species Si-O-C(O)-, at variance with the same groups on SBA-15.

引用

页码：1201 / 1209

页数：9

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