Thermal and chemical stability of titanium-substituted MCM-41
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- Rhee, C.H. & Lee, J.S. Catal Lett (1996) 40: 261. doi:10.1007/BF00815293
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.
KeywordsTi-substituted MCM-41 stability dehydrogenation of ethanol hydroxylation of phenol XRD XANES
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