Development of functional silica-coated metal catalysts with high durability and superior catalytic activity for dehydrogenation

用二氧化硅覆盖金属催化剂是提高催化剂稳定性的一种有效方法。另一方面，由于二氧化硅的覆盖抑制了反应物的扩散速度，从而带来了活性降低的可能性。此外，其应用可能仅限于与小分子相关的催化反应。在本研究中，我们制备了多孔薄二氧化硅覆盖的金属催化剂。研究发现，二氧化硅涂层金属催化剂在不需要大量烧结的情况下具有显着的金属热稳定性，并且由于其微孔和薄的二氧化硅层使其具有高的扩散速率，因此具有很高的催化活性。

The coverage of metal catalysts with silica layers is an effective method to enhance the stability of catalysts. On the other hand, it brings about the possibility of decrease of activity because the silica coverage could suppress diffusion rate of reactant. In addition, the application could be confined to catalytic reaction associated with small molecules. In this study, we prepared metal catalysts covered with porous and thin silica layers. It was found that the silica-coated metal catalysts had remarkable thermal stability of the metal without major sintering and showed high catalytic activity because the microporous and thin silica layers enable the high diffusion rate.