Functional hollow materials have attracted extensive research attention due to their promising prospects for catalysis. Herein, we report an alternative synthesis of hierarchically hollow structured materials directly from core–shell structured templates, based on confined chemical reactions between the solid matter of a core and shell under hydrothermal conditions. More specifically, we have developed a novel and facile strategy to transform core–shell structured Cu₂O@mSiO₂ (m = mesoporous) to tubular copper silicate assemblages (TCSA). Depending on the original shapes of Cu₂O, TCSA can be tailored as spherical or cubic assemblages with stacking copper silicate nanotubes (inner diameter: 4.5 nm, thickness: 0.8 nm, length: ca. 96 nm) in the shell. Moreover, by utilizing the residual reductive Cu(I) (ca. 10 at% of total surface copper) on TCSA support, in situ generations of Pd nanoparticles (∼4.5 nm) and Au nanoparticles (∼5.8 nm) were successfully achieved based on the spontaneous galvanic replacement reactions. Two integrated nanocatalysts (viz., Pd/TCSA and Au/TCSA) have been prepared with this approach. As an example, Pd/TCSA exhibits excellent activity and recyclability for Suzuki–Miyaura cross-coupling reactions.

中文翻译：

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核壳前体的拓扑转换为硅酸铜纳米管的分层空心组件。

功能性中空材料由于其有前景的催化前景而引起了广泛的研究关注。本文中，我们根据水热条件下核与壳的固体物质之间的局限化学反应，直接从核-壳结构模板中报告了分层空心结构材料的另一种合成方法。更具体地说，我们已经开发出一种新颖而又简便的策略，可以将核壳结构的Cu ₂ O @ m SiO ₂（m =中孔）转变为管状硅酸铜组件（TCSA）。取决于Cu ₂的原始形状O，TCSA可以定制为球形或立方组件，并在外壳中堆叠硅酸铜纳米管（内径：4.5 nm，厚度：0.8 nm，长度：约96 nm）。此外，通过利用TCSA载体上残留的还原性Cu（I）（约占总表面铜的10 at％），基于以下条件成功地实现了Pd纳米粒子（约4.5 nm）和Au纳米粒子（约5.8 nm）的原位生成。自发的电流置换反应。用这种方法已经制备了两种集成的纳米催化剂（即Pd / TCSA和Au / TCSA）。例如，Pd / TCSA对铃木-宫浦的交叉偶联反应具有出色的活性和可回收性。