Protonation of Al-grafted mesostructured silica nanoparticles (MSN): Acidity and catalytic activity for cumene conversion

M. R. Sazegar, A. A. Jalil, S. Triwahyono, R. R. Mukti, M. Aziz, M. A A Aziz, H. D. Setiabudi, Kamarudin Nur Hidayatul Nazirah

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The hexagonal structure of the mesostructured silica nanoparticles (MSN) based solid acid catalyst was synthesized using 1,2-propanediol as a co-solvent by sol-gel method, followed by aluminum grafting and protonation. The activity of the catalysts was tested for cumene conversion in a pulse microcatalytic reactor at 323-573K. XRD, TEM and N2 physisorption results confirmed the hexagonal ordered structure with a pore diameter of 3.4-4.0nm, a particle size of 70-120nm and a surface area of 588-995m2/g. Solid state NMR and IR results confirmed that the aluminum grafting and protonation form framework and extra-framework aluminums which led to generating strong Brønsted and Lewis acidic sites. High activity in the cumene conversion was only observed on HAlMSN producing propylene, benzene, toluene via a cracking on protonic acid sites and producing a main product of α-methylstyrene via a dehydrogenation on Lewis acidic sites at high reaction temperature. While only α-methylstyrene and higher hydrocarbon (≥C10) were produced at low reaction temperature showing the permanent Brønsted acid sites did not involve in the cumene conversion. It is suggested that the presence of hydrogen and strong Lewis acid sites increased the stability and activity of the HAlMSN catalyst in the cumene conversion. Although the small deactivation of HAlMSN was observed during the reaction due to the formation of small coke deposits on the surface, the reactivation recovered the activity of catalyst and the high activity was still observed after 60h of reaction. The high stability and activity of HAlMSN in the cumene conversion can be considered as a method for the production of α-methylstyrene via a dehydrogenation process.

Original languageEnglish
Pages (from-to)352-361
Number of pages10
JournalChemical Engineering Journal
Volume240
DOIs
Publication statusPublished - 15 Mar 2014
Externally publishedYes

Fingerprint

Protonation
Acidity
Silicon Dioxide
acidity
Catalyst activity
silica
catalyst
Silica
Nanoparticles
Catalysts
Acids
acid
Dehydrogenation
Aluminum
aluminum
Physisorption
Lewis Acids
Propylene Glycol
reactivation
Coke

Keywords

  • α-Methylstyrene
  • Cumene
  • Dehydrogenation
  • HAlMSN
  • MSN

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)
  • Industrial and Manufacturing Engineering
  • Environmental Chemistry

Cite this

Protonation of Al-grafted mesostructured silica nanoparticles (MSN) : Acidity and catalytic activity for cumene conversion. / Sazegar, M. R.; Jalil, A. A.; Triwahyono, S.; Mukti, R. R.; Aziz, M.; Aziz, M. A A; Setiabudi, H. D.; Nur Hidayatul Nazirah, Kamarudin.

In: Chemical Engineering Journal, Vol. 240, 15.03.2014, p. 352-361.

Research output: Contribution to journalArticle

Sazegar, M. R. ; Jalil, A. A. ; Triwahyono, S. ; Mukti, R. R. ; Aziz, M. ; Aziz, M. A A ; Setiabudi, H. D. ; Nur Hidayatul Nazirah, Kamarudin. / Protonation of Al-grafted mesostructured silica nanoparticles (MSN) : Acidity and catalytic activity for cumene conversion. In: Chemical Engineering Journal. 2014 ; Vol. 240. pp. 352-361.
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