期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 42, 页码 37210-37218出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b11808
关键词
integrated nanocatalysts; hierarchical structures; copper silicates; hollow; Suzuki Miyaura reactions
资金
- National Research Foundation (NRF), Prime Minister's Office, Singapore, under its Campus for Research Excellence and Technological Enterprise (CREATE) program
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@mSiO(2) (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 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.
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