Thermal and chemical stability of titanium-substituted MCM-41

被引：39

作者：

Rhee, CH

Lee, JS

机构：

[1] POHANG UNIV SCI & TECHNOL,DEPT CHEM ENGN,POHANG,SOUTH KOREA

[2] RES INST IND SCI & TECHNOL,POHANG 790784,SOUTH KOREA

来源：

CATALYSIS LETTERS | 1996年 / 40卷 / 3-4期

关键词：

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

D O I：

10.1007/BF00815293

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The thermal and chemical stability of a titanium-substituted MCM41 (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/O-2 = 1 mol/mol, 373-723 K). Under liquid-phase reaction conditions of phenol hydroxylation (phenol/35% H2O2/acetone in moles = 3 : 1 :7, 333 K), however, it lost the MCM-41 structure and titanium was leached out of the silicalite framework.

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页码：261 / 264

页数：4

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