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首页> 外文期刊>Journal of industrial and engineering chemistry >Comparison between cobalt and cobalt-platinum supported on zeolite NaY: Cobalt reducibility and their catalytic performance for butane hydrogenolysis
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Comparison between cobalt and cobalt-platinum supported on zeolite NaY: Cobalt reducibility and their catalytic performance for butane hydrogenolysis

机译：NaY沸石上负载的钴和钴-铂的比较：钴的还原性及其对丁烷氢解的催化性能

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摘要

This work investigated reducibility of cobalt species in monometallic Co/NaY and bimetallic CoPt/NaY catalysts with various Co loading (1, 6 and 10 wt.%) and fixed Pt loading (1 wt.%). The form and environment of Co species after reduction was determined by X-ray absorption spectroscopy including X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) spectroscopies. The cobalt species in the mono-and bimetallic catalyst with Co loading of 1 wt.% was not reducible whereas those with Co loading of 6 and 10 wt.% were partially reduced. The extent of reduction increased with Co loading and enhanced by the presence of Pt. Catalytic performance for n-butane hydrogenolysis mono-and bimetallic catalysts were compared. The higher extent of Co reduction in 6CoPt/NaY and lOCoPt/NaY resulted in higher conversions than the monometallic counterpart. Sequential hydrogenolysis was favored on the monometallic catalysts because methane was the only product. The presence of Pt suppressed such reaction resulting in ethane and propane. The effect of Pt on such effect was most prominent in 6CoPt/NaY.
机译：这项工作研究了钴负载量（1、6和10 wt。％）和固定铂负载量（1 wt。％）在单金属Co / NaY和双金属CoPt / NaY催化剂中钴物种的还原性。还原后的Co物种的形式和环境通过X射线吸收光谱法确定，包括近边缘结构的X射线吸收光谱（XANES）和扩展的X射线吸收精细结构光谱（EXAFS）。 Co含量为1 wt。％的单金属和双金属催化剂中的钴种类无法还原，而Co含量为6和10 wt。％的钴种类则部分还原。还原的程度随着Co负载的增加而增加，并且由于Pt的存在而增强。比较了正丁烷氢解单金属和双金属催化剂的催化性能。钴在6CoPt / NaY和10OCoPt / NaY中的还原程度较高，导致转化率高于单金属。由于甲烷是唯一的产物，因此在单金属催化剂上优先进行顺序氢解。 Pt的存在抑制了这种反应，从而产生乙烷和丙烷。 Pt对这种作用的影响在6CoPt / NaY中最为明显。

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