The effect of the difference in the oxidation state of the second component added to MoO3 on the generation of the acidic property.
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The effect of the difference in the oxidation state of the second component added to MoO<SUB>3</SUB> on the generation of acidic sites was studied with regard to Sn<SUP>2+</SUP>—Sn<SUP>4+</SUP>, Fe<SUP>2+</SUP>—Fe<SUP>3+</SUP>, Cr<SUP>3+</SUP>—Cr<SUP>6+</SUP>, and Cu<SUP>+</SUP>—Cu<SUP>2+</SUP>. It was found that a markedly lager amount of acidic sites is generated by the combination of Sn<SUP>2+</SUP>, Fe<SUP>2+</SUP>, or Cr<SUP>3+</SUP> with MoO<SUB>3</SUB> than by that of Sn<SUP>4+</SUP>, Fe<SUP>3+</SUP>, or Cr<SUP>6+</SUP> respectively. As a general feature of metal-oxide combination, it is proposed that the addition of a metal ion in a lower oxidation state to MoO<SUB>3</SUB> brings about a markedly more significant acidity generation than that of a metal ion in a higher oxidation state. An explanation to account for the results was attempted in relation to the reducing function of the second component.
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