Synthesis and properties of Fe/SBA-15

Composites involving Fe and mesoporous silica SBA-15 were obtained by means of a novel method

Leszek Ruchomski

2020

Scholarcy highlights

  • Composites involving Fe and mesoporous silica SBA-15 were obtained by means of a novel method
  • Anhydrous FeCl3 was deposited on SBA-15 from gaseous phase at 220–250 °C and the adsorbed chloride was hydrolyzed
  • Iron oxychloride which occurs in the composites was surprisingly stable against further hydrolysis, and chlorine could only be completely removed after a long and multi-step treatment with gaseous water
  • We hypothesize that similar problem might have occurred in course of preparation of other metal-modified mesoporous silicas, but it was ignored by most researchers, who have not analyzed their composites for the presence of chlorine
  • The akaganeite phase in SBA-15 was stable against dehydration, and it did not convert into anhydrous oxide on calcination at 250 °C for 1 day

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