We applied silica hollow microspheres with through holes in the shell as supports to prepare Pd-based supported catalyst (Pd/SHMs) for heterogeneous catalytic hydrogenation of polystyrene (PS) and also systematically studied the adsorp- tion and reaction behavior of PS molecules over Pd/SHMs. The dynamic adsorption and reaction models of PS molecules under different temperatures have been established and the partially hydrogenated products were also comprehensively ana- lyzed. The result shows that both the adsorption capacity and saturation time are increased as the temperature increasing and this hydrogenation reaction is confirmed to be a first-order reaction and the activation energy is calculated to be 58.3 kJmol -1 . After separating and purifying three samples with different hydrogenation degrees, we further analyzed the partially hydrogenated products and the results show that they are all actually comprised of two kinds of substances with different properties, one with high hydrogenation conversion rate (ca. 85%) and the other with low hydrogenation ratio (ca. 25%). It is proved that PS heterogeneous hydrogenation process exists secondary adsorption and competitive adsorption phenomenon, and obeys the Blocky mechanism. This work lays the foundation for PS adsorption and hydrogenation reaction and is also favorable for the understanding of the adsorption and catalytic process for other unsaturated polymers over heterogeneous catalysts.

中文翻译：

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聚苯乙烯多相催化加氢吸附反应动力学研究

我们应用壳上带有通孔的二氧化硅空心微球作为载体制备了用于聚苯乙烯（PS）多相催化加氢的 Pd 基负载催化剂（Pd/SHMs），并系统研究了 PS 分子在 Pd 上的吸附和反应行为。 /SHM。建立了PS分子在不同温度下的动态吸附和反应模型，并对部分氢化产物进行了综合分析。结果表明，吸附容量和饱和时间都随着温度的升高而增加，证实该加氢反应为一级反应，活化能为58.3 kJmol -1 。将三种不同氢化程度的样品分离纯化后，我们进一步分析了部分加氢的产物，结果表明它们实际上都是由两种性质不同的物质组成，一种加氢转化率高（约85%），另一种加氢率低（约25%） ）。证明PS多相加氢过程存在二次吸附和竞争吸附现象，服从Blocky机理。该工作为PS吸附和加氢反应奠定了基础，也有利于理解其他不饱和聚合物在多相催化剂上的吸附和催化过程。85%) 和另一个具有低加氢率 (ca. 25%)。证明PS多相加氢过程存在二次吸附和竞争吸附现象，服从Blocky机理。该工作为PS吸附和加氢反应奠定了基础，也有利于理解其他不饱和聚合物在多相催化剂上的吸附和催化过程。85%) 和另一个具有低加氢率 (ca. 25%)。证明PS多相加氢过程存在二次吸附和竞争吸附现象，服从Blocky机理。该工作为PS吸附和加氢反应奠定了基础，也有利于理解其他不饱和聚合物在多相催化剂上的吸附和催化过程。