用Mossbauer和ESR表征了异丁酸氧化脱氢制取甲基丙烯酸的Pb-FePO_4催化剂 ,同质异能位移和四极分裂值表明,该系催化剂中三价铁占据两种不等效位 Fe~(3+)(A)和 Fe~(3+)(B),当Fe~(3+)(A)接触异丁酸和H时被还原成Fe~(2+)(A)和Fe~(2+)(B),其中还原位Fe~(2+)(A)在反应中很快被O_2重新氧化,Fe~(3+)(A)是活性位,异丁酸在此位上脱氢而生成甲基丙烯酸,上述实验结果证明,在异丁酸氧化脱氢生成甲基丙烯酸反应中,Pb-FePO_4催化剂以氧化还原循环机理维持催化活性。 Mossbauer and ESR were used to characterize the Pb-FePO_4 catalysts for the oxidative dehydrogenation of isobutyric acid to methacrylic acid. Homogeneous displacement and quadrupole splitting values ​​show that the ferric iron occupies two inequalities Fe Fe (3 +) (A) and Fe ~ (3 +) (B) were reduced to Fe ~ (2 +) (A) and Fe ~ (2 +) (B). Fe ~ (2 +) (A) was quickly oxidized by O_2 in the reaction, Fe ~ (3 +) (A) On the dehydrogenation of methacrylic acid generated, the above experimental results show that, in the isobutyric acid oxidative dehydrogenation of methacrylic acid reaction, Pb-FePO 4 catalyst to maintain the catalytic activity of the redox cycle mechanism.