Er对Mo-Bi-O催化剂性能的影响

Effect of Erbium Additive on the Catalytic Property of Mo-Bi-O

用共沉淀法在Mo Bi O催化剂中加入Er2 O3,并在固定床反应器中考察了Er2 O3添加量、反应温度、异丁烯浓度、原料气流量等对异丁烯转化为甲基丙烯醛反应的影响。实验表明 ,添加Er2 O3可明显提高异丁烯的转化率和甲基丙烯醛的选择性 ,Er2 O3的添加量为 15 %时 ,甲基丙烯醛产率最高。用XRD技术研究了催化剂的组成 ,Mo Bi O催化剂的成分主要是α Bi2 Mo3O1 2 ,添加Er后出现了Er2 Mo3O1 2

Erbium oxide was added to Bi 2O 3-MoO 3 mixed oxides catalyst(Mo-Bi-O) vi a coprecipitation. Reaction temperature, concentration of isobutene in air a nd ratio of Er 2 O 3 in the Mo-Bi-O catalysts were studied in a f ixed bed reactor. The results showed that conversion of isobutene and selectivity for methacrolein was improved when erbium oxide was added in the catalyst. The maximum yield of methacrolein was obtained when proportion of erbi um reached 15%. XRD patterns of the catalyst samples revealed that the main co mponent of the Mo-Bi-O catalyst with added erbium is Er 2 Mo 3 O 12 .