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ÎÄÏ×£ºThe  activity  measurements  were  carried  out  in  a  fixed-bed quartz  reactor  using  a  0.25  g  catalyst  of  40¨C60  meshes.  The  feed
gas  mixture  contained  500  ppm  NO,  500  ppm  NH3,  5%  O2 and helium  as  the  balance  gas.  The  total  flow  rate  of  the  feed  gas  was
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