Acidity of sulfated oxides: Al2O3, TiO2 and SiO2. Application of test reactions
Literature Information
Marek Marczewski, Agnieszka Jakubiak, Hanna Marczewska, Anna Frydrych, Małgorzata Gontarz, Anna Śnieguła
The acidic properties of different oxide/SO42− type superacids have been studied. Test reactions indicated that the acid strength of the Al2O3/SO42− system changed considerably with H2SO4 surface content notably −7.05 < H0 < −10 (1%), −10 < H0 < −14 (2–3%), H0 < −14 (4–9%), while for TiO2/SO42− preparations it was high and less dependent on catalyst composition: H0 < −14 (≥1%) and finally for SiO2/SO42− catalysts it was low with −0.75 < H0 < −3.50 (1–9%). Alkane isomerization over Al2O3/SO42− and TiO2/SO42− catalysts was observed to begin with the formation of an unsaturated intermediate state through the action of redox centres. Further alkene transformation into carbenium ion in the presence of Brønsted sites (Al2O3/SO42−) or secondary Brønsted centres (TiO2/SO42−) allows skeletal alkane isomerization to proceed.
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