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首页> 外文会议>40th Annual Loss Prevention Symposium >Effects of trace amount of noble metal (Pd/Rh) on the performance of Co-Clay catalystsfor heavy oil upgrading
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Effects of trace amount of noble metal (Pd/Rh) on the performance of Co-Clay catalystsfor heavy oil upgrading

机译：痕量贵金属（Pd / Rh）对重油改质Co-Clay催化剂性能的影响

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This communication reports the promotional effects of small amounts of Pd and Rh onthe hydrodesulfurization (HDS) and hydrocracking (HC) activities of high porous saponite(HPS) supported Co catalysts. During catalyst preparation, HPS was first modified with thenoble metal(s) using an incipient wetness impregnation technique followed by cobalt loadingthrough an ion exchange method. Temperature-programmed reduction (TPR) studies showedthat the reducibility of the catalysts was significantly improved by the noble metals (Pd, Rh).Higher metal dispersion and hydrogen spillover effects were considered to be the mainreasons for the increased reducibility. Both the HC and HDS activities of noble metal-promotedCo/HPS catalysts were found to be higher than that of plain Co/HPS catalysts, when evaluatedin a batch autoclave reactor using vacuum gas oil as feedstock. Furthermore, Rh displayedhigher promotional effects as compared to Pd in both HC and HDS. This higher activity isconsistent with the TPR results, which showed superior reducibility of the Rh promotedcatalysts. A particular interesting finding of this study pertained to a synergic effects of bi-noble(Pd–Rh) metal promoted Co/HPS catalyst. It was observed that a trace amount of Rh and Pdexhibited a significant enhancement of the catalytic activity of Co/HPS. The activity of thebimetallic catalyst was comparable to that of the Rh promoted catalyst with higher Rh loading.It should be noted that this synergic effects was achieved with a lower overall noble metalcontent, which is crucial for the economic feasibility of the catalyst for industrial application.The coke deposition on the Pd–Rh promoted catalyst was also found be the lower than that ofthe plain and single noble metal promoted Co/HPS, which is a positive aspect for a longercatalyst lifetime. Therefore, this study revealed that trace amount of noble metal promotedCo/HPS catalyst holds great promise for HC and HDS of heavy oil.
机译：该通报报告了少量Pd和Rh对 多孔皂石的加氢脱硫（HDS）和加氢裂化（HC）活性 （HPS）负载的Co催化剂。在催化剂制备过程中，首先对HPS进行了改性 使用初期湿润浸渍技术，然后负载钴的贵金属 通过离子交换方法程序升温还原（TPR）研究表明 贵金属（Pd，Rh）显着提高了催化剂的还原性。 较高的金属分散度和氢溢出效应被认为是主要的 还原性增加的原因。贵金属促进的HC和HDS活性 经评估，发现Co / HPS催化剂比普通Co / HPS催化剂高 在间歇式高压釜反应器中，使用减压瓦斯油作为原料。此外，Rh显示 与HC和HDS中的Pd相比，促销效果更高。这项较高的活动是 与TPR结果一致，表明Rh的还原性更好 催化剂。这项研究的一个特别有趣的发现与双贵族的协同作用有关 （Pd–Rh）金属促进的Co / HPS催化剂。观察到痕量的Rh和Pd 表现出Co / HPS催化活性的显着增强。活动 双金属催化剂可与具有较高Rh负载量的Rh助催化剂相比。 应该注意的是，这种协同作用是通过较低的整体贵金属实现的 含量，这对于工业应用催化剂的经济可行性至关重要。 还发现在Pd-Rh促进的催化剂上的焦炭沉积低于 普通的和单一的贵金属促进的Co / HPS，这对于较长的时间来说是一个积极的方面 催化剂寿命。因此，这项研究表明，促进了微量的贵金属 Co / HPS催化剂对重油的HC和HDS具有广阔的前景。

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