Cobalt-, copper- and iron-containing monolithic aluminosilicate-supported preparations for selective catalytic reduction of NO with NH₃ at low temperatures

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• 作者：Brandhorst ; M. ; Zajac ; J. ; Jones ; D.J. ; Roziè ; re ; J. ; Womes ; M. ; Jimenez-Ló ; pez ; A. ; et. al.
• 关键词：Catalyst materials ; Co- ; Cu- and Fe-based monolithic aluminosilicate-supported preparations ; SCR of NO with NH₃
• 刊名：Applied Catalysis B ; Environmental
• 出版年：2005
• 期刊代码：4_09263373
• 类别：ce
• 出版时间：February 25, 2005
• 卷：55
• 期：4
• 页码：267-276
• 文件大小：229 K

摘要

Aluminium-doped mesoporous monolithic silica possessing fine mesopores has been prepared via the direct liquid crystal templating pathway using a non-ionic surfactant template and has been used as a support for cobalt-, copper-, and iron-based formulations in the selective catalytic reduction (SCR) of NO with ammonia in the presence of oxygen at low temperatures in the range of 373–723K. The monolithic support was characterised by N₂ gas adsorption at 77K, powder X-ray diffraction (XRD) and NH₃ adsorption at 373K. Surface area, pore structure and surface acidity of the catalysts before and after being subjected to catalytic testing were determined, and good stability of pore structure and surface properties under SCR conditions was indicated. The NO conversions on aluminosilicate monolith-supported catalysts were compared with those observed on the reference catalyst, EUROCAT powder. The Co-functionalised catalysts appeared less relevant to DeNO_x purposes. Two impregnated and two ion-exchanged catalysts containing copper and iron showed catalytic performance comparable to that of the reference catalyst. They produced only small amounts of undesired product N₂O, the Fe-containing formulations being even more selective than EUROCAT. The nature of metal species in these catalysts was investigated with the aid of Cu 2p X-ray photoelectron spectroscopy (XPS) and ⁵⁷Fe Mössbauer spectroscopy.