Synthesis and characterization of chromium(III)-doped magnesium fluoride catalysts

被引：32

作者：

Murthy, JK

Gross, U

Rüdiger, S

Ünveren, E

Unger, W

Kemnitz, E

机构：

[1] Humboldt Univ, Inst Chem, D-12489 Berlin, Germany

[2] Fed Agcy Mat Testing & Res, BAM, Berlin, Germany

来源：

APPLIED CATALYSIS A-GENERAL | 2005年 / 282卷 / 1-2期

关键词：

Lewis acid; heterogeneous catalysis; metal fluoride; doped systems;

D O I：

10.1016/j.apcata.2004.12.004

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：

Cr3+-doped MgF2 systems are synthesised by a novel non-aqueous soft chemistry route using different Cr precursors and varying Cr loading. These systems have been characterized by X-ray powder diffraction (XRD), BET surface area, TPD of ammonia, FT-IR pyridine adsorption analysis and X-ray photoelectron spectroscopy, and tested for their catalytic activity in dismutation of CCl2F2 and CF3-CHCIF Catalysts synthesised starting from CrO3 or (CH3CO2)(7)Cr-3(OH)(2) showed better catalytic activity than those prepared with CrCl3. Fr-IR pyridine adsorption studies reveal that the catalytic activity is highly correlated with the Lewis acid strength. In TPD of NH3 catalysts prepared from CrO3 and (CH3CO2)(7)Cr-3(OH)(2), precursors showed a similar behaviour, different from that of catalysts prepared from CrCl3. (c) 2004 Elsevier B.V. All rights reserved.

引用

页码：85 / 91

页数：7

共 23 条

[1] Magnesium- and iron-doped chromium fluoride hydroxyfluoride: Synthesis, characterization and catalytic activity [J].