Ru/13X zeolite catalysts containing 0.6, 2 and 5.7% Ru prepared by reduction or decomposition of the hexammine complex are active and stable for n-butane hydrogenolysis between 400 and 460 K, and show similar activation energies (150–160 kJ mol⁻¹) and orders of reaction (−1.5 to −2 in H₂; 0.5–0.65 in n-butane); product selectivities show weak dependence on temperature and H₂ pressure, with preference for terminal bond scission. Oxidising either the decomposed or the reduced catalysts gave a marked increase in activity, a lower activation energy (120–130 kJ mol⁻¹), higher orders of reaction in H₂ (∼−0.9), lower orders in n-butane (∼0.2) and product selectivities that showed greater change with temperature and H₂ pressure; terminal bond scission was >90%. The change in character with oxidation was attributed to weaker H₂ chemisorption and a higher concentration of partially dehydrogenated C₄ species; the active phase may consist of very small particles of RuO₂ confined within the supercages of the zeolite.

中文翻译：

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烷烃的氢解：正丁烷在Ru /沸石催化剂上的反应

通过还原或分解六胺配合物制备的Ru / 13X沸石催化剂，含0.6、2和5.7％的Ru，对400-460 K的正丁烷氢解具有活性和稳定性，并显示出相似的活化能（150-160 kJ mol ^-1）和反应顺序（在H _2中为-1.5至-2 ；在正丁烷中为0.5-0.65 ）；产物选择性显示出对温度和H ₂压力的弱依赖性，优选末端键断裂。氧化分解的或还原的催化剂可显着提高活性，活化能较低（120-130 kJ mol ^-1），H _2中的反应阶数较高（〜-0.9），n中的阶数较低-丁烷（〜0.2）和产物选择性随温度和H ₂压力变化较大；末端键断裂> 90％。氧化特性的变化归因于H _2的化学吸附较弱和部分脱氢的C ₄物种的浓度较高。活性相可以由限制在沸石超笼中的非常小的RuO ₂颗粒组成。