Characterisation of defective silicalites

被引：118

作者：

Bordiga, S

Roggero, I

Ugliengo, P

Zecchina, A

Bolis, V

Artioli, G

Buzzoni, R

Marra, G

Rivetti, F

Spanò, G

Lamberti, C

机构：

[1] Univ Turin, Dipartimento Chim, IFM, I-10125 Turin, Italy

[2] Univ Piemonte Orientale Amedeo Avogadro, Dipartimento Sci Chim Alimentari Farmaceut & Farm, I-28100 Novara, Italy

[3] Univ Milan, Dipartimento Sci Terra, I-20133 Milan, Italy

[4] EniChem SpA, Ctr Ric Novara, Ist G Donegani, I-28100 Novara, Italy

[5] Univ Turin, Unita INFM, I-10124 Turin, Italy

来源：

JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS | 2000年 / 21期

关键词：

D O I：

10.1039/b004794p

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The structure and the adsorptive properties of internal defects in two chemically very pure silicalite samples, characterised by a high and low concentration of defects (internal SiOH nests generated by Si vacancies), are investigated by means of several physical methods (neutron diffraction, IR spectroscopy of adsorbed NH3, microcalorimetry of NH3 adsorption and quantum chemical computation). The role of cooperative effects in hydrogen bonded chains and rings of silanols covering the internal defective nanocavities in influencing the absorptive properties of the material is elucidated. This study provides an explanation of the less hydrophobic character of defective silicalite relative to perfect silicalite and sheds light on the reason why defective silicalite acts as an efficient and selective catalyst for the gas phase Beckman rearrangement reaction where cyclohexanone oxime is converted into caprolactam.

引用

页码：3921 / 3929

页数：9

共 31 条

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