The chemoselective hydrogenation of α, β-unsaturated aldehydes are highly dependent on both the electronic and structural effects of the catalysts. In this study, hydrogenation of cinnamaldehyde was carried out over a series of integrated nanocatalysts consisting of Pt nanoparticles and hollow transition metal silicates which were prepared by either one-pot method or sol-immobilization method. The hollow transition metal silicates not only served as mesoporous support materials for high-efficient loading of Pt but also provide tunable Fe/Ni as promoters to improve the catalysis process. It was revealed that using hollow Fe silicate as support generally exhibited low activity but high selectivity due to the strong interaction of CO bond, whereas, using hollow Ni silicate as support showed enhanced activity but low selectivity, which was attributed to the different electronic effects as evidenced by H₂-TPR and XPS. In addition, electronic effects among the ternary catalysts with Pt loading on Fe-Ni bimetallic silicates were critical to the observed high turnover frequencies, that is, Pt sites contributed to H₂ activation, Fe sites favored the preferential adsorption of CO bond in cinnamaldehyde, while Ni sites promoted the formation of Pt⁰ rather than Pt^δ+.

α，β-不饱和醛的化学选择性加氢高度依赖于催化剂的电子和结构效应。在这项研究中，肉桂醛的氢化反应是在一系列由Pt纳米颗粒和中空过渡金属硅酸盐组成的集成纳米催化剂上进行的，这些催化剂是通过一锅法或溶胶固定法制备的。中空过渡金属硅酸盐不仅用作高效负载Pt的中孔载体材料，而且还提供可调节的Fe / Ni作为促进剂，以改善催化过程。结果表明，使用空心硅酸铁作为载体通常表现出较低的活性，但由于C的强相互作用而具有较高的选择性。然而，使用空心硅酸镍作为载体的O键显示出增强的活性，但选择性低，这归因于H ₂ -TPR和XPS证明的不同电子效应。此外，三元催化剂中Pt负载在Fe-Ni双金属硅酸盐上的电子效应对于观察到的高周转频率至关重要，也就是说，Pt位点有助于H ₂活化，Fe位点有利于肉桂醛中C O键的优先吸附。Ni位促进了Pt ⁰的形成，而不是Ptδ ^+的形成。