The structure of the catalyst plays an important regulatory role in heterogeneous catalysis. Herein, we report the preparation of a novel NiRu bimetallic catalyst Ru/Ni/Ni(Al)O_x, confined by a weak crystalline Ni(Al)O_x matrix, by the reduction of an NiAlRu-layered double hydroxide (LDH) precursor in hydrogen atmosphere. Doping Ru³⁺ in LDH can facilitate the reduction of Ni²⁺ by hydrogen spillover and obviously decrease the size of Ni particles. The catalytic performance was evaluated by dimethyl terephthalate (DMT) hydrogenation to dimethyl cyclohexane-1,4-dicarboxylate (DMCD). The Ru/Ni/Ni(Al)O_x sample showed an enhanced catalytic activity with the conversion rate of DMT 99.3% and the selectivity of DMCD 93.2%. The reduction temperature can greatly affect the microstructure evolution and accordingly the catalytic performance. The synergistic effect of metal Ru and Ni is proposed to enhance the ability to activate H₂ and to adsorb DMT on the Ni(Al)O_x matrix.

中文翻译：

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用于对苯二甲酸二甲酯加氢成1,4-二羧酸二甲酯的封闭NiRu双金属催化剂

催化剂的结构在非均相催化中起重要的调节作用。在这里，我们报道了一种新型的NiRu双金属催化剂Ru / Ni / Ni（Al）O _x的制备，该催化剂是通过还原NiAlRu层状双氢氧化物（LDH）前体而由弱结晶Ni（Al）O _x基质限制的。在氢气氛中。在LDH中掺入Ru ³⁺可以促进氢溢出减少Ni ^2+的含量，并明显减小Ni颗粒的尺寸。催化性能通过对苯二甲酸二甲酯（DMT）加氢成1,4-二羧酸环己烷二甲酯（DMCD）进行评估。Ru / Ni / Ni（Al）O _x样品显示出增强的催化活性，DMT的转化率为99.3％，DMCD的选择性为93.2％。还原温度可极大地影响微观结构的演变并因此影响催化性能。提出金属Ru和Ni的协同作用以增强活化H ₂和将DMT吸附在Ni（Al）O _x基质上的能力。