摘要
本文报导用于异丁烯（叔丁醇）选择氧化制ＭＡＬ（甲基丙烯醛）的多元复合氧化物催化剂的研究结果。同共沉淀法制备的催化剂的活性主要决定于其化学组成，同时受到制备条件的影响。最佳催化剂的主要物相组成为ＰｂＯ３，Ｂｉ２ＭｏＯ３．３、ＮｉＭｏＯ４、Ｓｂ２Ｏ３及ａ－Ｆｅ２Ｏ３小颗粒。在３５５℃，１０００～２５００ｈ－１空速范围，叔丁醇：水：空气＝１：３．３：７（摩尔比）的条件下可获得异丁烯转化率达９６％，ＭＡＬ选择性达８９％的结果。
The effect of the chemical composition and preparation method of the multicomponent metal oboes and tile catalytic reaction condition on the catalytic oxidation of isobutene to methacrolein (MAL) were studied. X-ray diffraction (XRD), BET surface area measurement and Mossbauer spectroscopy were used for the catalyst characterization. It is shown that the catalytic activity and selectivity for the oxidation of isobutene to MAL are significantly improved by the addition of W and Cs element into the catalyst, and the ekistance of Bi is beneficial to MAL selectivity. The most active catalyst consists of NiMoO4, Bi2MoO3.3 , Sb2O3, PbO2 and superparamagnetic a-Fe2O3 crystalline phases. Compared to Bi2MoO6 phase Bi2MoO3.3 is more efficient for the reaction. Higher catalytic activity can be correlated to the higher surface area of the catalyst, although no direct proportional relationship is observed. At 355℃, with Me3 COH: H2O: air=1: 3. 3: 7 and space velocity= 1000￣2500h-1, 96% conversion and 89% selectivity for MAL is obtained over the catalyst mentioned above.
出处
《工业催化》
CAS
1994年第1期25-31,共7页
Industrial Catalysis
关键词
异丁烯
甲基丙烯酸
催化剂
氧化
methacrolein multicomponent catalyst co-precipitation
