Skip to main content
Article
Structural and Superacidity Study of Bifunctional Catalyst, Sulfated-Titanium/TS-1
Malaysian Journal of Chemistry (2005)
  • Didik Prasetyoko, University Technology Malaysia
  • Zainab Ramli, University Technology Malaysia
  • Salasiah Endud, University Technology Malaysia
  • Hadi Nur, University Technology Malaysia
Abstract

Bifunctional oxidative and acidic catalysts are prepared in this study. The sulfated titanium silicalite is prepared by first, synthesizing the titanium silicalite (TS-1) having oxidative properties, followed by the deposition of titanium on the surface of TS-1, and finally, treatment of the solid with sulfuric acid. The structure of the solid samples are characterized by XRD, FTIR, and UV-Vis DR spectroscopy techniques, while the strength and the type of acid site are monitored by Hammet indicator and pyridine adsorption method, respectively. The results show that the MFI structure of TS-1 is maintained even after the treatment with sulfuric acid. However, a part of the tetrahedral titanium framework of the TS-1 has been expelled from the framework and becomes non-framework octahedral titanium after contacting with sulfuric acid. The acidity study by Hammet indicator indicates that sample possesses superacidic property, measured by Hammet indicator 2,4-dinitrobenzene (pKa = -14.52), in which the acid type is Lewis, from the pyridine adsorption.

Keywords
  • superacidity,
  • bifunctional catalyst,
  • sulfated TS-1,
  • Hammet indicator
Disciplines
Publication Date
June, 2005
Citation Information
Didik Prasetyoko, Zainab Ramli, Salasiah Endud and Hadi Nur. "Structural and Superacidity Study of Bifunctional Catalyst, Sulfated-Titanium/TS-1" Malaysian Journal of Chemistry Vol. 7 Iss. 1 (2005)
Available at: http://works.bepress.com/hadi_nur/28/