Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190 (P. R. China), Tel and Fax: (+86) 10-6255-7908; Graduate University of Chinese Academy of Sciences, Beijing, 100049 (P. R. China).
Chem Asian J. 2013 Oct;8(10):2459-65. doi: 10.1002/asia.201300514. Epub 2013 Jun 18.
Two kinds of multifunctional nanocomposites, SBA-15-NH2/Pd-p and SBA-15-NH2/Pd-f, with platelet-like and fiber-like morphologies, respectively, were fabricated by immobilizing Pd NPs onto amine-functionalized SBA-15. Some of the amino groups acted as anchoring sites for Pd NPs, whilst the remaining groups acted as Brønsted basic sites. As a result, the composites served as excellent multifunctional heterogeneous catalysts for one-pot multistep cascade reaction sequences. Moreover, when diffusion was the rate-determine step, SBA-15-NH2/Pd-p, with small mesopores, was superior to the fiber-like control sample, owing to its short diffusion length, a lower possibility of pore clogging, and better mass transportation for the reaction species during the catalysis.
两种具有层状和纤维状形貌的多功能纳米复合材料 SBA-15-NH2/Pd-p 和 SBA-15-NH2/Pd-f 是通过将 Pd NPs 固定在氨基功能化的 SBA-15 上制备的。一些氨基充当 Pd NPs 的锚固位点，而其余的氨基充当 Brønsted 碱性位。因此，这些复合材料可用作一锅多步级联反应序列的优良多功能多相催化剂。此外，当扩散是速率决定步骤时，具有小孔的 SBA-15-NH2/Pd-p 由于其较短的扩散长度、堵塞孔的可能性较小以及在催化过程中反应物的传质更好，因此优于纤维状对照样品。
