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首页> 外文期刊>RSC Advances >Analysis of the catalytic activity induction and deactivation of PtIn/Mg(Al)O catalysts for propane dehydrogenation reaction
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Analysis of the catalytic activity induction and deactivation of PtIn/Mg(Al)O catalysts for propane dehydrogenation reaction

机译：PtIn / Mg（Al）O催化剂在丙烷脱氢反应中的催化活性诱导和失活分析

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摘要

The catalytic activity induction and deactivation of PtIn/Mg(Al)O catalysts for propane dehydrogenation reaction are experimentally verified. Numerous physical-chemical characterizations are employed to probe the basis and structure-activity relationships, and a mechanism for the activity induction and deactivation is proposed with the help of a schematic diagram. XPS results prove that the valence state of In exhibits almost no change during the entire dehydrogenation reaction. In the activity induction period, the average metal particle size of the PtIn/Mg(Al) O catalyst presents a decreasing trend, and the specific surface area increases. Moreover, the crystal phase changes from primarily periclase (MgO) to dominantly meixnerite (Mg6Al2(OH)(18)center dot 4H(2)O). Coke is mainly deposited on the carrier. Nevertheless, in the deactivation period, the metal particles tend to agglomerate and grow. The specific surface area decreases and crystal phase returns to the unique periclase crystal phase. A large amount of coke is formed over the catalyst and partially covers the active sites, which leads to the evident decrease of catalytic activity.
机译：实验验证了PtIn / Mg（Al）O催化剂对丙烷脱氢反应的催化活性和失活。许多物理化学特征被用来探究基础和结构-活性之间的关系，并借助示意图提出了活性诱导和失活的机理。 XPS结果证明，在整个脱氢反应中，In的价态几乎没有变化。在活性诱导期中，PtIn / Mg（Al）O催化剂的平均金属粒径呈减小趋势，比表面积增大。此外，晶体相从主要的镁铝石（MgO）变为主要的镁橄榄石（Mg6Al2（OH）（18）中心点4H（2）O）。焦炭主要沉积在载体上。然而，在失活期间，金属颗粒趋于附聚并生长。比表面积减小并且晶相返回到独特的周长石晶相。大量的焦炭在催化剂上形成并部分覆盖了活性部位，这导致催化活性明显降低。

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