Catalytic Dehydration of 1-Propanol Over Silica Containing Sulfonic Acid Groups

Mustapha Mokhtari,Leila Kharbouche,Hadj Hamaizi

doi:10.1590/1980-5373-mr-2018-0690

Abstract

Mesoporous silica with strongly acid sulfonic sites were synthesized and used as catalytic supports for catalytic dehydration of 1-propanol. This porous material with a large surface area and high porosity were prepared by a simplified sol-gel in an acidic medium and impregnated easily by -SO3H groups. The experimental results indicate that the very strong acidic sites contained on the surface are the seats of the reaction involving two molecules of n-propanol. By hydrogen bonding, ether compounds as well as the corresponding alkene are obtained in appreciable yield.

Highlights

RCH2CH2 - OH " RCH = CH2 QalkeneV + H2O [1]Mesoscopically ordered mesoporous silica materials have attracted a wide interest since their discovery in the early 1990's 1 due to their diverse potential applications areas; including catalysis, filtration and chromatography
Ordered mesoporous silica materials have attracted a wide interest since their discovery in the early 1990's 1 due to their diverse potential applications areas; including catalysis, filtration and chromatography
These materials have a "wormhole" or cubic structure with a much larger pore diameter than that usually observed in MCM-41 7.Other studies of this type of materials are reported by Huo et al.8, Ryoo et al.9 and Richer and Mercier 10 which describes the textural properties

Summary

Introduction

Silica mesoporous materials have opened the field of investigation in many organic reactions until considered laborious and source of pollution. Bagshaw et al 6 synthesized a variety of materials called MSU-X using polyoxyethylene (PEO) surfactants as structuring agents. These materials have a "wormhole" or cubic structure with a much larger pore diameter than that usually observed in MCM-41 7.Other studies of this type of materials are reported by Huo et al., Ryoo et al. and Richer and Mercier 10 which describes the textural properties. A number of studies have investigated the dehydration reaction of primary and branched alcohols, with obtaining the corresponding olefin as the major product and the formation of monoether. It has been known that alcohols undergo thermal decomposition in two ways: RCH2 CH2 - OH + RCH2 CH2 - OH " [2] RCH2 CH2 - O - RCH2 CH2 QetherV + H2 O

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Conclusion