合成pH值对FeMo催化剂结构和催化性能的影响。
Effect of synthesis pH on the structure and catalytic properties of FeMo catalysts.
作者信息
Zhang Shuai, Han Minghan
机构信息
Department of Chemical Engineering, Beijing Key Laboratory of Green Reaction Engineering and Technology, Tsinghua University Beijing 100084 China
出版信息
RSC Adv. 2019 Dec 17;9(71):41720-41728. doi: 10.1039/c9ra07202k. eCollection 2019 Dec 13.
The effect of pH on polynuclear molybdenum species (isopolymolybdates) synthesis was investigated by Raman spectroscopy. As the pH decreased from 6.0 to 1.0, the main isopolymolybdates changed from MoO to MoO to MoO to MoO . They began to aggregate and their solubility decreased with decreasing pH. The FeMo catalysts comprised particle- and plate-like structures, which were Fe(MoO) and MoO, respectively. When a low pH value was used in the catalyst preparation, there was severe aggregation of the particles which have a high Mo/Fe mole ratio and Mo enrichment on the surface layer, which decreased the activity and selectivity of the FeMo catalyst.
通过拉曼光谱研究了pH对多核钼物种（同多钼酸盐）合成的影响。随着pH从6.0降至1.0，主要的同多钼酸盐从MoO 变为MoO 再变为MoO 最后变为MoO 。它们开始聚集，并且其溶解度随着pH降低而减小。FeMo催化剂由颗粒状和板状结构组成，分别为Fe(MoO)和MoO。当在催化剂制备中使用低pH值时，具有高Mo/Fe摩尔比且表面层有Mo富集的颗粒会发生严重聚集，这降低了FeMo催化剂的活性和选择性。
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