异丁烷选择氧化制备甲基丙烯酸复合氧化物催化剂的表征  

CHARACTERIZATION OF COMPLEX OXIDE CATALYSTS FOR i-BUTANE SELECTIVELY OXIDATION TO PRODUCT MAA

作　　者：凌云[1] 钟顺和[2] 黄少斌[3] 

机构地区：[1]石油化工科学研究院,北京100083 [2]天津大学化学工程学院,天津300072 [3]华南理工大学应用化学系,广州510641

出　　处：《石油学报（石油加工）》2001年第z1期27-31,共6页Acta Petrolei Sinica(Petroleum Processing Section)

摘　　要：制备了 V2 O5 -Si O2 、Mo O3-Si O2 和 Mo O3-V2 O5 -Si O2 3种复合氧化物催化剂。用程序升温还原 (TPR)研究了各复合氧化物的表面构造及其催化活性 ,用化学吸附红外光谱 (IR)研究了各复合氧化物样品对异丁烷和异丁烯的化学吸附性能。实验结果表明 ,上述复合氧化物催化剂中 ,Si和 V或 Mo通过氧桥键合 ,使得 V O 、Mo O的氧化能力有所减弱 ,从而更加适合于选择氧化的要求。异丁烷在 Mo的复合氧化物中为桥式吸附 ,有利于脱氢。但在 V O诸点上 ,异丁烷为线式吸附 ,容易发生深度氧化。异丁烯在复合氧化物中的 V O、 Mo O均为线式吸附 ,V吸附的能力较强。复合氧化物中的 V O、 Mo O 是异丁烯脱氢。The complex oxides of V 2O 5 SiO 2、MoO 3 SiO 2、MoO 3 V 2O 5 SiO 2 were prepared. The surface structure and catalytic activity of these complex oxides were investigated by TPR. The chemisorption characteristics of i butane and i butene on these complex oxides were investigated by IR spectroscopy. An interaction in bonding type between V, Mo and Si was observed, which decreased the oxidability of VO and Mo O, making VO and Mo O more suitable for selective oxidation. That i butane adsorbed on Mo O sites in bridge form makes dehydrogenation more easy. But on VO sites, i butane adsorbed in linear form is susceptible to deep oxidation. i Butene adsorbed on VO and Mo O are both in linear form, however the adsorption ability of VO is stronger. Both VO and Mo O on complex oxide catalysts are excellent sites for i butene dehydrogenation and oxidation.

关 键 词：复合氧化物 选择氧化 红外光谱 程序升温还原 

分 类 号：O643.36[理学—物理化学]