摘要
本文用XRD,IR,Raman,SEM和ESR等方法研究了系列氧化物Bi_2Mo_(3-3x)Nb_(2x)O_(12-4x)(X=0.00,0.02,0.05,0.10,0.15,0.20,0.25)的结构和对丙烯氧化的催化活性,结果表明,在X≤0.25范围内,催化剂基本保持典型的α-Bi_2Mo_3O_(12)结构,少量Nb^(5+)的掺杂,可取代晶格中的Mo^(6+),产生氧空位,无序分布的氧空位的浓度先随X值的增加而增加,当X=0.15时达最大值,催化剂对丙烯氧化的催化活性与这种氧空位的浓度成正比,反应遵循Redox机理.
The structure and catalytic activity for propylene oxidation of series oxides Bi2Mo3-3X-Nb2xO12-4x(X=000, 0.02, 0.05, 0.10, 0.15, 0.20, 0.25) have been studied by means of XRD, IR, Raman, SEM, ESR and so on. The results showed that in the range of X<0.25 the cataysts possessed a typical α-Bi2Mo3O12 structure, while the oxygen vacancies were formed due to the substitution of Nb5+ for Mo6+, and the concentration of randomly distributed oxygen vacancy passed through a maximum at X=0.15. The catalytic activity was in parallel with the concentration of oxygen vacancy. The catalytic reaction obeyed Redox mechanism.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1994年第6期521-528,共8页
Acta Chimica Sinica
