The dehydrogenation of methylcyclohexane (MCH) is a widely used hydrogen storage technology, but nowadays, precious metal catalysts such Pt are used for this reaction and non-precious metal catalysts suffer from low selectivity and instability problems. Two catalysts, Ni/TiO and Ni/AlO, were prepared through the improved co-precipitation method and their dehydrogenation performance of MCH was compared. It was found that the application of TiO carrier could significantly reduce the acidity of the catalysts, and the nickel particles could be stably dispersed on the carriers, which could effectively improve the selectivity of the target product (toluene). In addition, the influences of different Ni contents, reaction temperatures, and weight hourly space velocity (WHSV) on the performance of the catalysts were also evaluated, and the results showed that the catalyst with 17.16 % Ni content exhibited high activity with up to 86.48 % conversion of MCH and 96.51 % selectivity of toluene, under atmospheric pressure condition with the reaction temperature of 375 °C and WHSV of 1.9 h, while 96.03 % and only 42.64 %, respectively, for the Ni/AlO catalyst. In addition, the catalyst exhibited excellent anti-coking ability, indicating that it has a promising future for industrial applications.

中文翻译：

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Nix/TiO2催化剂提高甲基环己烷脱氢选择性

甲基环己烷（MCH）脱氢是一种广泛使用的储氢技术，但目前该反应使用Pt等贵金属催化剂，非贵金属催化剂存在选择性低和不稳定的问题。通过改进的共沉淀法制备了Ni/TiO和Ni/Al2O两种催化剂，并比较了它们的MCH脱氢性能。结果发现，TiO载体的应用可以显着降低催化剂的酸度，并且镍颗粒可以稳定地分散在载体上，可以有效提高目标产物（甲苯）的选择性。此外，还评估了不同Ni含量、反应温度和重时空速（WHSV）对催化剂性能的影响，结果表明，Ni含量为17.16%的催化剂表现出较高的活性，高达86.48在常压条件下，反应温度375℃，空时空速1.9 h，MCH转化率%，甲苯选择性96.51%，而Ni/Al2O催化剂分别为96.03%和42.64%。此外，该催化剂表现出优异的抗结焦能力，表明其具有广阔的工业应用前景。