MoO_3/Al_2O_3、MoO_3/TiO_2与NiO-MoO_3/TiO_2催化剂上活性相还原行为的XPS考察

石化工业中广泛使用的加氢脱硫(简称HDS)催化剂大多数是以γ-Al_2O_3为担体,以MoO_3或WO_3为主要活性组份,添加CoO或NiO为助剂的多组份催化剂。过去对HDS催化剂本质做了大量的研究,在研究中应用了XPS等许多现代物理方法近。年有报导     

MoO3 / Al2O3、MoO3 / TiO2与NiO-MoO3 / TiO2催化剂上活性相还原行为的XPS考察

The H_2 reduction behaviours of MoO_3/Al_2O_3, MoO_3/TiO_2 and NiO-MoO_3/TiO_2 samples prepared by impregnation method were studied at various temperatures for different times by XPS technique. The recored XPS spectra of Mo3d from those samples were treated by computer curve fittingprogram to measure the distribution of various molybdenum oxide species with different valence states. The results of computer fitting shows that there areMo(Ⅵ), Mo(Ⅴ)and Mo(Ⅳ) on the all of reduced samples. However, after H_2 reductonin same way, the percentage of low valence species Mo(V) and Mo(IV) on the MoO_3/TiO_2 is much higher than on the MoO_3/Al_2O3 (Fig.2). For example, after H_2 treatment at 500 ℃ for 2 hrs., Mo(IV) species on the surface of MoO_3/TiO_2 sample is about 60% and it is three times higher than what is found on the MoO_3/Al_2O_3 sample. In addition, the reduction of molybdena on TiO_2 support is much easier and faster than on Al_2O_3 support (Fig.3). Addition of NiO further promotes the reduction of molybdena to cause the strting reduction temperature producing Mo(IV) and Mo(V) to be decreased about 100 ℃. and 80% of molyb dena on NiO-MoO_3/TiO_2 support could be reduced to Mo(IV) (Fig.2). A detail discussion about the interaction between molybdena and carries was presented. It was suggested that TiO_2 is certainly involved in the reduction and oxidation process of molybdenum oxide species on the surface of it.     

答复关于海波生产上的一些问题

化学通报今年第二期登载的“作样制海波”是我车间在海波试制期间草草写成的,设备、操作过程写得都不够详尽,自刊出后不断接到各地来信询问详细生产情况。对其生产我们亦缺乏足够的知识,仅就我厂目前生产所据经验草做如下答复。设备由于不断跃进,短短几个月我车间较之生产初期在各方面都有很大的改善:产量由日产二、三百斤骤增至1吨左右,设备业已基本实现半机械化。燃硫炉,求其简便我们改用缸代替炉身,即将直径70厘米水缸倒置,在下端20厘米高处凿一燃硫炉门;炉门高11厘米,宽20厘米,缸的下面再浮放一与缸内     

怎样制海波(Na_2S_2O_3)

北京市东城化工厂是以少花钱多办事,缺什么制什么的方针,最近用“土”法试制成许多新的产品,已投入生产的硫代硫酸钠(海波),制作简便,设备简单,是很值得推广的。由于医药、影片事业的发展,对海波的需要日益增多,以前所需多依靠进口和上海,广州等地生产,外地