Study of unreduced and reduced iron catalysts containing zirconium and calcium for ammonia synthesis has been made by using Mssbauer spectroscopy.An analysis of the Mssbauer paramaters shows that Zr4+ enters in to oct...Study of unreduced and reduced iron catalysts containing zirconium and calcium for ammonia synthesis has been made by using Mssbauer spectroscopy.An analysis of the Mssbauer paramaters shows that Zr4+ enters in to octahedral B sites of Fe3O4 and results in expansion of B sites.This is propitious to reduction of the catalysts.As a result of combination of Zr with Ca each other the Fe on A sites in sample containing Zr and Ca is reduced more rapidly,this is ascribed to electron conductivity.These exhibitions are more evident in the spherical catalyst cooled quickly by water.展开更多
文摘Study of unreduced and reduced iron catalysts containing zirconium and calcium for ammonia synthesis has been made by using Mssbauer spectroscopy.An analysis of the Mssbauer paramaters shows that Zr4+ enters in to octahedral B sites of Fe3O4 and results in expansion of B sites.This is propitious to reduction of the catalysts.As a result of combination of Zr with Ca each other the Fe on A sites in sample containing Zr and Ca is reduced more rapidly,this is ascribed to electron conductivity.These exhibitions are more evident in the spherical catalyst cooled quickly by water.
