上海交通大学车顺爱团队报道了介孔分子筛中超小多金属纳米粒子的文库构建策略。 相关研究成果于2021年4月7日发表于国际一流学术期刊《德国应用化学》。

超小型多金属纳米颗粒（UMMNs）与介孔分子筛复合材料的发展是化学和材料科学领域的一个重大挑战。

研究人员设计了一种三功能表面活性剂，疏水尾端的吡啶基苯并咪唑通过π‐π堆积形成介孔，亲水头基中的二季铵直接形成MFI分子筛片，杂环中的氮原子与各种金属离子配位形成封闭在分子筛中的UMMNs煅烧还原后的沸石基体。

用4个单金属、14个双金属和38个三金属纳米颗粒（尺寸为1.3-4.7nm）和Rh、Pd、Pt、Au、Fe、Co、Ni、Cu和Zn的组合制备了一个限制在MFI分子筛（MMZs）微孔和介孔内的由56个微纳米颗粒组成的的文库。

结果表明，Rh-MMZ<Rh/Pt-MMZ<Rh/Pt/Ni-MMZ对甲烷温和氧化制甲醇或液态酸的催化性能有所提高。

附：英文原文

Title: Library Creation of Ultrasmall Multi‐metallic Nanoparticles Confined in Mesoporous MFI Zeolites

Author: Xiaoli Jia, Jingang Jiang, Shihui Zou, Lu Han, Haiyin Zhu, Qing Zhang, Yue Ma, Peng Luo, Peng Wu, Alvaro Mayoral, Xinbao Han, Jun Cheng, Shunai Che

Issue&Volume: 2021-04-07

Abstract: The development of materials integrated with ultrasmall multi‐metal nanoparticles (UMMNs) and mesoporous zeolite is a considerable challenge in chemistry and materials science. We designed trifunctional surfactant, in which the pyridyl benzimidazole in the hydrophobic tail generates the mesopores through π‐π stacking; the diquaternary ammonium in the hydrophilic headgroup direct the formation of MFI zeolite sheets and the nitrogen atoms in heterocyclic ringscoordinate with various metal ions to form UMMNs confined in the zeolite matrix after calcination and reduction. A library of 56 UMMNs confined within both micropores and mesopores of MFI zeolites (MMZs) with 4 mono‐, 14 bi‐ and 38 tri‐metallic nanoparticles (sizes of 1.3‐4.7 nm) of combinations of Rh, Pd, Pt, Au, Fe, Co, Ni, Cu and Zn were made. An improved catalytic performance was exhibited in the sequence of Rh‐MMZ<Rh/Pt‐MMZ<Rh/Pt/Ni‐MMZ for the mild oxidation of methane to methanol or liquid acid.

DOI: 10.1002/anie.202103007

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202103007