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The role of Nb in the formation of sulphonic species in SBA-15 and MCF functionalised with MPTMS

Paper ID Volume ID Publish Year Pages File Format Full-Text
55165 47042 2012 6 PDF Available
Title
The role of Nb in the formation of sulphonic species in SBA-15 and MCF functionalised with MPTMS
Abstract

Mesoporous silica and niobiosilicate materials of SBA-15 and MCF types were prepared in the presence of MPTMS, i.e. (3-mercaptopropyl)trimethoxysilane and hydrogen peroxide. The samples obtained were characterised by different techniques (N2 adsorption/desorption, XRD, elemental and thermal analyses) and applied as catalysts in glycerol esterification with acetic acid. The role of niobium species on the formation of sulphonic species and stability of organosilane modifier was explored. The most important finding is that the addition of niobium to the synthesis gel improves the efficiency of –SH oxidation by hydrogen peroxide towards sulphonic species. This behaviour is not dependent on the type of structure of mesoporous materials (SBA-15 or MCF). However, the kind of mesoporous solid influences the efficiency of Nb incorporation and on the esterification process. MCF matrix improves the catalytic performance of the MPTMS modified catalyst.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (201 K)Download as PowerPoint slideHighlights► For both modified SBA-15 and MCF samples niobium enhanced the oxidation of thiol species (MPTMS). ► Niobium had an impact on the drop of methoxy species oxidation (MPTMS). ► NbMCF modified samples were more active than NbSBA-15 in the esterification process.

Keywords
Niobium species; Hydrogen peroxide; Acidity; Esterification
First Page Preview
The role of Nb in the formation of sulphonic species in SBA-15 and MCF functionalised with MPTMS
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 192, Issue 1, 30 September 2012, Pages 130–135
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis