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首页> 外文期刊>Chemistry: A European journal >Spatially resolved Raman and UV-visible-NIR spectroscopy on the preparation of supported catalyst bodies: Controlling the formation of H2PMo11CoO405- inside Al2O3 pellets during impregnation
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Spatially resolved Raman and UV-visible-NIR spectroscopy on the preparation of supported catalyst bodies: Controlling the formation of H2PMo11CoO405- inside Al2O3 pellets during impregnation

机译：空间分辨拉曼光谱和紫外-可见-近红外光谱在负载型催化剂主体制备上的作用：浸渍过程中控制H2PMo11CoO405-在Al2O3颗粒内部的形成

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摘要

The physicochemical processes that occur during the preparation of CoMo-Al2O3, hydrodesulfurization catalyst bodies have been investigated. To this end, the distribution of Mo and Co complexes, after impregnation of gamma-Al2O3 pellets with different CoMoP solutions (i.e., solutions containing Co, Mo, and phosphate), was monitored by Raman and UV-visible-NIR microspectroscopy. From the speciation of the different complexes over the catalyst bodies, insight was obtained into the interaction of the different components in the impregnation solution with the Al2O3 surface. It is shown that. after impregnation with a solution containing H2PMo11CoO405- the reaction of phosphate with the Al2O3 leads to the disintegration of this complex, The consecutive independent transport of Co2+ complexes (fast) and Mo6+ complexes (slow) through the pores of the Al2O3 is envisaged, By the addition of extra phosphate and citrate to the impregnation solution. the formation of the desired heteropolvanion can be achieved inside the pellets. Ultimately, the H2PMo11CoO405- distribution could he controlled by varying the aging time applied after impregnation. the power of it combination of spatially resolved spectroscopic techniques to monitor the preparation of supported catalyst bodies is illustrated.
机译：研究了在制备CoMo-Al2O3加氢脱硫催化剂体过程中发生的物理化学过程。为此，在用不同的CoMoP溶液（即，含有Co，Mo和磷酸盐的溶液）浸渍γ-Al2 O 3粒料之后，通过拉曼和UV-可见-NIR显微光谱法监测Mo和Co络合物的分布。从催化剂主体上不同配合物的形态分析，可以了解到浸渍溶液中不同组分与Al2O3表面的相互作用。如图所示。在用含有H2PMo11CoO405的溶液浸渍后，磷酸盐与Al2O3的反应导致该配合物崩解，设想了Co2 +配合物（快速）和Mo6 +配合物（缓慢）通过Al2O3孔的连续独立运输，向浸渍溶液中添加额外的磷酸盐和柠檬酸盐。可以在粒料内部实现所需异杂离子的形成。最终，可以通过改变浸渍后的老化时间来控制H2PMo11CoO405-的分布。说明了其结合空间分辨光谱技术来监测负载型催化剂体制备的强大功能。

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