Haichuan Zhang,Zede Yi,Shiyu Fu,Changzhi Li,Lucian A. Lucia,Qiying Liu
A rational design of the intrinsic lattice structure of catalysts is vitally important to address catalytic performance. Herein is reported a top-down synthesis for the fabrication of a bifunctional metallic catalyst. First, palladium nanocubes with (100) lattices planes were synthesized through a shape-control strategy; next, the as-synthesized Pd/Co-ZIF was used as a template for in - situ phase reconstruction by a spontaneous phase transformation process in the presence of H 4 SiW under solvothermal conditions. Ultimately, formation of 3D hierarchical flower-like bimetallic nitride nanosheets (SiW 12 @Pd/Co-ZIF-NS) were generated because of this process. The SiW 12 @Pd/Co-ZIF-NS catalyst not only displays excellent catalytic transfer hydrogenolysis for C-O bond cleavage of lignin dimeric substrates, but also maintains superior recycling durability due to an encapsulation phenomenon preventing aggregation. Finally, the resulting nanocomposites exhibit superior activity and good size selectivity toward catalytic transfer hydrogenolysis of the actual lignin substrates to produce a significant amount of low-molecular-weight aromatic compounds .
Searching for nanofillers that have prominent barrier performance, good compatibility with polymer matrix and little chance of triggering galvanic corrosion remains a challenge in organic coating industries. In this study, ZIF nanosheets (ZIF-NS) were readily fabricated at room temperature and then used as additives in epoxy matrix for anticorrosion purpose. EIS demonstrated that epoxy doping with 0.5 wt% ZIF-NS possessed a resistance modulus at 0.01 Hz of 2.88 × 10 9 Ω·cm 2 after immersion for 20 days, which was 2 orders of magnitude higher than that of neat epoxy. Owing to the restrained propagation of coating defects, as well as the tortuous diffusion channels for aggressive ions, ZIF nanosheets have showed great potential to form epoxy-based composite coatings on a large scale, and might pave the way for applications of other two-dimensional MOFs in industries.
危险品化学品经营许可证（带存储）