Study on Ti-Sn Solid Solution Supported Catalyst for Selective Catalytic Reduction of NOx with NH3

Yaping Zhang,Kai Shen,Haitao Xu,Keqin Sun,Changcheng Zhou,Jiaxin Zhong

doi:10.1109/iceee.2010.5661393

Abstract

TiO 2 -SnO 2 solid solution supports was prepared by coprecipitation method with different SnO 2 content (molar fraction) and calcination temperature and V 2 O 5 was loaded on the supports to obtain V 2 O 5 / TiO 1-x Sn x O 2 catalysts by wet-impregnation method. The support and catalyst were characterized by X-ray diffraction (XRD) and BET and their catalytic performances for the selective catalytic reduction of NO X with NH 3 were investigated on in a quartz tubular fixed-bed microreactor to compare preparation methods of solid solution on the catalytic activity of De-NO x . The study indicates that different ratios of SnO 2 to TiO 2 can form continuous solid solution which has rutile crystal structure. The particle size of the solid solution is smaller than that of pure TiO 2 or pure SnO 2 . The change of the surface area of the SnO 2 -TiO 2 solid solution with the SnO 2 or TiO 2 content is a volcano shape curve and the solid solution with 50% SnO 2 content has largest BET surface area and highest De-NO x activity. Rutile crystal structure begins to appear in the SnO 2 -TiO 2 solid solution calcined at 450°C and replaces anatase phase more as calcination temperature rises and no anatase crystal structure can be detected at 700°C according to XRD result. The BET surface area of solid solution and catalysts declines with higher calcination temperature, either. De-NO x activity V 2 O 5 / TiO 1-x Sn x O 2 shows the same trend. V 2 O 5 / TiO 1-x Sn x O 2 catalyst calcined at 450°C comprises both anatase and rutile phase of TiO 2 , showing higher thermal stability, larger surface area and stronger De-NO x activity, while 1% V 2 O 5 loading supported on TiO 0.5 Sn 0.5 O 2 solid solution is highly active for NO removal.

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