Catalysis Letters

, Volume 40, Issue 3–4, pp 261–264 | Cite as

Thermal and chemical stability of titanium-substituted MCM-41

  • Chang Houn Rhee
  • Jae Sung Lee
Article

Abstract

The thermal and chemical stability of a titanium-substituted MCM-41 (TiMCM-41) with Si/Ti mole ratio of 39 and pore diameter of 2.4 nm was studied with the small-angle X-ray diffraction and X-ray absorption near-edge structure techniques. The TiMCM-41 was stable in helium flow below 1273 K and under gas-phase reaction conditions of ethanol dehydrogenation (ethanol/ O2 = 1 mol/mol, 373–723 K). Under liquid-phase reaction conditions of phenol hydroxylation (phenol/35% H2O2 /acetone in moles=3∶1∶7,333K), however, it lost the MCM-41structure and titanium was leached out of the silicalite framework.

Keywords

Ti-substituted MCM-41 stability dehydrogenation of ethanol hydroxylation of phenol XRD XANES 

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Copyright information

© J.C. Baltzer AG, Science Publishers 1996

Authors and Affiliations

  • Chang Houn Rhee
    • 1
    • 2
  • Jae Sung Lee
    • 1
    • 2
  1. 1.Department of Chemical EngineeringPohang University of Science and Technology (POSTECH)PohangKorea
  2. 2.Research Institute of Industrial Science and Technology (RIST)PohangKorea

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