Skip to main content
Article
On Effective Locations of Catalytic Active Sites in Phase Boundary Catalyst
ITB Journal of Science (2012)
  • Hadi Nur, University Technology Malaysia
  • Nur Hidayah Mohd Ran, University Technology Malaysia
  • Nur Syafreena Attan, University Technology Malaysia
  • Shigeru Ikeda
  • Bunsho Ohtani, Hokkaido University
Abstract

Zeolite loaded with alkylsilane-covered titanium oxide was found to be more effective than nonporous silica counterpart as “phase-boundary catalyst (PBC)” to promote the epoxidation of alkenes with aqueous hydrogen peroxide. It was demonstrated that the phase-boundary catalyst system required neither stirring to make an emulsion nor addition of a cosolvent to make a homogeneous solution to drive the reaction. However, some basic facts about them remain unclear, such as the question as to where an effective location of the active sites of PBC: is it the external surface of the catalysts or in their pore? In order toelucidate this problem, TS-1, HZSM-5 and zeolite loaded with alkylsilane–covered sulfonic acid in which the location of the active sites mainly inside the pore system are chosen as model catalysts. Catalytic activity of TS-1 and HZSM-5 catalysts were examined after modification with alkylsilane (ODS). Their activities are compared with zeolite loaded with alkylsilane-covered titanium oxide particles, in which the active sites are on their external surface in reactions of 1-octene with aqueous H2O2 and cyclohexene with water as model reactions. It was suggested that the location of the active sites on the external surface plays an important role in ”phase-boundary catalysis” phenomenon.

Disciplines
Publication Date
2012
Citation Information
Hadi Nur, Nur Hidayah Mohd Ran, Nur Syafreena Attan, Shigeru Ikeda, et al.. "On Effective Locations of Catalytic Active Sites in Phase Boundary Catalyst" ITB Journal of Science Vol. 44A Iss. 2 (2012)
Available at: http://works.bepress.com/hadi_nur/66/